Single-Point Gas Alarm System
NV-120 series
Instruction Manual for Operation

Keep this manual for easy reference.
Prior to use, carefully read this manual as well as NV-120 series instruction manual for installation(separate document) for correct use.
This manual describes the standard model. If your unit has end-user-specific options, this manual will besuperseded by your delivery specifications.

Instruction Manual No.
GAE-154-03
September 2022

Related Manuals
The following documents have been prepared to guide your installation and use of this product.
(1) NV-120 series Instruction Manual for Installation, No. GAE-153-xx
This document is intended for your supervisors and service personnel who are concerned with the
installation of this product. It also provides the following information to ensure correct installation of
the product:● Safety precautions● Unit dimensions and components and precautions for unpacking● Installation precautions
One manual is provided per order, not per unit.
(2) NV-120 series Instruction Manual for Operation (this document), No. GAE-154-xx
This document is intended for your supervisors, operators and service personnel who areconcerned with the operation and maintenance of this product. It provides the following information
to ensure the safe use of the product:● Basic construction and component names/functions● Unit dimensions and components, power on/off and troubleshooting● Operation modes and on-screen menus● Maintenance procedure and consumable replacement
One manual is provided per order, not per unit.
(3) NV-120 series wiring diagram with gas detector, No. GAE-158-xx
This document shows typical wiring configurations when connected with a gas detector and provide
supplement information for the installation.
One manual is provided per order, not per unit.

iIntroduction
Thank you for purchasing the New Cosmos NV-120 series single-point gas alarm system (“product”
or “unit” hereafter).
Prior to use, please read this manual as well as NV-120 series instruction manual for installation(No. GAE-153-xx) and follow the instructions provided for correct use.
Periodic maintenance is essential to maintain the reliability of the product. Perform periodic
maintenance checks in the manner described in this document.
Keep this manual in a safe place for easy reference.
This unit is used in connection with a gas detector (or gas detector head) that can detect a variety of
combustible/toxic gases at the site (one target gas at one detector/time). Install the gas detector at alocation where it is necessary to detect the target gas. Install the unit at a location convenient formonitoring the gas concentration.
This unit shows the gas concentration detected by the corresponding gas detector on its bar graphdisplay. In case the detector detects a leak of the target gas that exceeds a preset limit or reductionof concentration to a level below a preset limit in the case of oxygen, the unit produces audio-visual
alarms (e.g., LED, beep sound, voice message), thus helping prevent incidents such as low oxygen,gas poisoning and explosion.
There are various types of NV-120 series units. They are divided into four groups according to thegas detector types they are used with, and they are further divided into the following seven models
according to the gas sensor types. The wiring, adjustments and other unit-related items can varyfrom group to group. This manual clearly specifies the name of the applicable group/model andshows that the information or instruction provided applies to a certain group/model only.
CE marking specification is applied to NV-120Mx which uses 24 VDC power supply. Refer to the“EU Declaration of Conformity” (separate document) for more information on the CE marking unit.
Group

Model Variation
NV-120Hv
NV-120Cv
NV-120Sx
NV-120Dx
NV-120Mx
NV-120Hi
NV-120Ci

Group 1
Group 2
Group 3
Group 4

A few acts are prohibited without the prior consent of New Cosmos. Please note that use of thisproduct will be treated as your acceptance of these terms. If you do not agree to these terms, do not
use this product and immediately consult your local sales representative. The aforementioned acts
are the following: Modification of this product and its related components
 Reverse-engineering of this product and its related components
 Analysis of this product and its related components including disassembly and reverse
compilation
 Transfer of this product and its related components to a third party Third party use of this product and its related components for any reason, including lease andlicensingⅱPrecautions
Unauthorized copying and replication of the contents of this manual, in whole or in part, are strictly
prohibited.
The contents of this manual are subject to change without notice.
This manual has been prepared with the utmost care. If any incorrect description comes to yournotice, please contact us for correction.

Symbols Used in this Instruction Manual
Symbols for Danger Levels
Operators’ safety has been put first in designing this product. However, there exist someunavoidable risks due to the system characteristics. In this manual, safety symbols are divided into
three categories, Danger, Warning and Caution, depending on the severity and magnitude of therisks. Carefully read the contents related to the precautions before operation and maintenancework.
This manual uses Danger, Warning, Caution and Notice symbols to draw attention to procedures,materials, methods and processes that require particular attention.

Indicates an imminently hazardous situation that can result in death or serious injury.

Indicates a potentially hazardous situation that may result in death or serious injury.

Indicates a hazardous situation that may result in minor injury or property damage.

NOTICE
Indicates a hazardous situation that will not result in injury but may cause a product, facility, or
related equipment damage or failure.

iii

Other Signs and Symbols
This manual also uses the following signs and symbols.

NOTE

Provides supplemental or useful information on product handling.

Ref.

Details the related information or procedure.

Don’tsIndicates a prohibited action.
Mandatory
Indicates an action that must be done.
Electrical hazard
Warns of risk of electric shock under a certain condition.
Explosive hazard
Warns of a risk of explosion while handling explosive items.
Corrosive hazard
May cause burn or loss of sight if skin or eye comes into contact.

ⅳ

Quick Index
This page lists parts that may be often referenced.
Prior to use, please read the precautions in “1 General Precautions”.
Unit Dimensions and Components
Pages 8 to 13

Operation
Pages 27 to 69

113
Non-backup power type

Power-on and Power-off
Pages 15 and 16

Maintenance
Pages 70 to 76

Gas Alarm Operation
Pages 19 to 21

Troubleshooting
Pages 77 and 78v

Table of Contents

Related Manuals.......................................................................................................................................... i
Introduction ................................................................................................................................................. ii
Precautions ........................................................................................................................................ iii
Symbols Used in this Instruction Manual ........................................................................................... iii
Quick Index ................................................................................................................................................. v
1

General Precautions ...........................................................................................................................1
1.1 Before Work ................................................................................................................................1
1.2 Safety Precautions ......................................................................................................................1
1.3 Warning and Caution Labels Affixed to Product .........................................................................2
1.3.1 Warning and Caution Labels Affixed to Product ...............................................................3
1.4 Working Clothes and Protective Equipment ...............................................................................3
1.5 Batteries ......................................................................................................................................4
1.5.1 Battery Location ................................................................................................................5
1.5.2 Battery Replacement Procedure ......................................................................................5
1.5.3 Battery Life ........................................................................................................................5
1.5.4 Battery Disposal ................................................................................................................6
1.6 Product Disposal .........................................................................................................................6
1.7 Service Life .................................................................................................................................6
1.8 Definition of Supervisor/Operator/Service Personnel .................................................................62

Unit Structure ......................................................................................................................................7
2.1 Package Contents .......................................................................................................................7
2.2 Unit Dimensions and Components .............................................................................................8
2.2.1 Main Unit (Exterior Appearance).......................................................................................8
2.2.2 Main Unit (Interior Appearance) ..................................................................................... 10
2.2.3 LCD ................................................................................................................................. 11
2.2.4 Terminal Blocks .............................................................................................................. 123

System Configuration ....................................................................................................................... 14

4

Operation .......................................................................................................................................... 15
4.1 Power-on and Power-off .......................................................................................................... 15
4.1.1 Power-on........................................................................................................................ 15
4.1.2 Power-off........................................................................................................................ 16
4.2 Operation Flow at Power-up .................................................................................................... 17
4.2.1 Power-up (Warm-up) ..................................................................................................... 17
4.3 Gas Alarm Operation ............................................................................................................... 19
4.3.1 Gas Alarm Operation during Normal Operation............................................................. 19
4.3.2 Gas Alarm Operation during Maintenance Mode .......................................................... 20
4.3.3 Gas Alarm Clearance Method........................................................................................ 21
4.3.4 Peak Hold Function ....................................................................................................... 21
4.4 Operation in Event of Failure ................................................................................................... 22
4.5 Audio Alarms ............................................................................................................................ 22
4.5.1 Voice Message .............................................................................................................. 23
4.6 BZ STOP/RESET Button ......................................................................................................... 24
4.7 Backup Power Type ................................................................................................................. 25
4.7.1 BATT LED ...................................................................................................................... 25
4.7.2 Continuous and Intermittent Gas-monitoring Modes ..................................................... 26ⅵ

5

Operation Menus .............................................................................................................................. 27
5.1 Overview of Operation Menus ................................................................................................. 27
5.1.1 Buttons and Dial ............................................................................................................ 27
5.1.2 Access to Main Menu .................................................................................................... 28
5.1.3 Select Item in Menu ....................................................................................................... 28
5.1.4 Menu Operation ............................................................................................................. 29
5.1.5 Deactivate Safety Lock .................................................................................................. 30
5.2 Maintenance Mode .................................................................................................................. 30
5.2.1 Enter Maintenance Mode............................................................................................... 31
5.2.2 Exit Maintenance Mode ................................................................................................. 32
5.3 Test Mode................................................................................................................................. 33
5.4 Battery Voltage Test ................................................................................................................. 35
5.5 Calibration Menu ...................................................................................................................... 37
5.5.1 Manual Zero Adj. ............................................................................................................ 38
5.5.2 Auto Zero Adj. ................................................................................................................ 41
5.5.3 Manual Span Adj. ........................................................................................................... 43
5.5.4 Span Adj. (fixed) ............................................................................................................ 46
5.5.5 Auto Span Adj. ............................................................................................................... 49
5.5.6 Span Adj. (20.9 vol%) .................................................................................................... 52
5.5.7 Clear Span Adj. (20.9 vol%)........................................................................................... 54
5.6 Device Setting Menu ................................................................................................................ 56
5.6.1 Device Setting ................................................................................................................ 56
5.6.2 Alarm Setting ................................................................................................................. 63
5.7 Information ............................................................................................................................... 67
5.7.1 Configuration Data ......................................................................................................... 68
5.7.2 Event History ................................................................................................................. 69

6

Maintenance ..................................................................................................................................... 70
6.1 Routine Check and Periodical Inspection ................................................................................ 70
6.1.1 Fuse Replacement ......................................................................................................... 71
6.1.2 Battery Replacement ..................................................................................................... 72
6.1.3 AC-DC Power Supply Unit Replacement ...................................................................... 74

7

Error Codes and Solutions ............................................................................................................... 77

8

Troubleshooting ................................................................................................................................ 78

9Specifications ................................................................................................................................... 79

10 Warranty ........................................................................................................................................... 81
11 Glossary ........................................................................................................................................... 82

vii

1

General Precautions

1 General Precautions
1.1 Before Work
In order to ensure safe use, carefully read the precautions in this manual before turning on thisproduct to prevent unexpected accidents. New Cosmos is not responsible for the cost incurred orany damage resulting from any usage other than that outlined in this document.
This chapter “General Precautions” provides a general description of methods of safely using thisproduct as well as safety information and cautions related to this product.

1.2 Safety Precautions
Carefully read the following precautions for correct use.
Use this product in accordance with the applicable laws and regulations.
Wiring and installation should only be performed by a qualified electrician with knowledge of
wiring/installation procedures in accordance with the applicable technical standards.

 Operation check using actual gas is extremely dangerous and requires a special
attention, because combustible gas may have a risk of explosion and toxic gas may
be harmful to human health. It must be performed by qualified personnel or a New
Cosmos authorized technician.
 In the event of a gas alarm, take necessary actions to prevent gas poisoning.

 This product is not explosion-proof and should not be installed in a hazardous area.

 Do not use organic solvents for cleaning the product. Organic solvents may
negatively affect the product’s exterior as well as internal components.

 Ground the product to prevent electric shocks.

 In the event of a gas leak alarm, follow safety procedures in accordance with yourcompany's regulations.

 Do no use radio wave-emitting devices (e.g., cell phones, wireless devices)of the product.

30 cm

 Do not disassemble, modify, or alter the structure of the product or its electricalcircuits. Doing so may compromise product performance.

11

General Precautions

 Wiring and installation should only be performed by a qualified electrician withknowledge of wiring/installation procedures, in accordance with the applicabletechnical standards.
 New Cosmos is not responsible for the cost incurred or any damage resulting fromcontrolling external equipment (e.g., interlock) by using the product’s outputs (e.g.,analog output, alarm relay contact output).
 Only use this product in accordance with the applicable laws and regulations.

 This product is not drip-proof and should be kept away from splashing water or rain.

1.3 Warning and Caution Labels Affixed to ProductWarning and Caution labels are affixed to the areas or surrounding parts that are potentially
dangerous and require a special attention.

 To ensure safety, check the locations of the Warning and Caution labels andcarefully read them prior to operation.
 If Warning and Caution labels are missing, damaged or illegible, please contact us
for replacement.
Warning and Caution labels use size and color that are appropriate to draw the attention of theoperator and provide the risk levels with symbols.
 Refer to “1.3.1 Warning and Caution Labels Affixed to Product” for information on the labels
affixed to the product. Read the labels to be alert to possible dangers and their locations andmeet the requirements provided by the labels.
 Do not remove or damage the Warning and Caution labels.
 It is very dangerous to leave the Warning and Caution labels dirty or obscured. Please contact
New Cosmos or its authorized representative for new labels.

2

1

General Precautions

1.3.1

Warning and Caution Labels Affixed to Product

Do not relocate the Warning and Caution labels affixed to the product.

Carefully read the contents of the labels prior to use.

Item
1
2
3
4

Description
Power rating label
Indicates the model, power source, target gas, and manufacturing date.
Caution label
Indicates the cautions to be adopted while handling this product.
BATT light status label
Describes the backup battery status that the BATT LED indicates.
Caution label for battery replacement (only for backup power type unit)
Indicates cautions for installation space and battery replacement.

1.4 Working Clothes and Protective Equipment

 Wear your company-specified working clothes and use protective equipment whileworking around the unit.
 Wear the right size working clothes that do not interfere with the work.

3

1

General Precautions

1.5 BatteriesThis product uses two lead storage batteries (when the unit is backup power type).
The batteries need to be replaced periodically.
The battery life varies depending on the frequency of use and environment conditions.
Follow the precautions below for proper operation.

Batteries may short-circuit resulting in electric shock or burns.
Follow the precautions listed below:
 Avoid thermal, electrical and mechanical impact on the batteries.
 Do not disassemble the batteries. Do not insert external metal in the connections on
the product’s power or signal cable. Doing so may cause electric shock, heat,
ignition or injury.
 In order to prevent rapid battery discharge, protect the battery’s electrode from directcontact with other electrolytes or metal objects. Battery discharge may cause heat orbattery leak.
 Store batteries in a clean and dry place at a temperature of 30C or lower to prevent
degradation.

 Do not place tools or other metal objects on the batteries.

 Do not mix new and old batteries.

 Use the specified batteries. Unspecified batteries may cause device failure.

 Dispose of batteries in accordance with the applicable laws and regulations.
 If abnormal odor, noise or smoke is observed during operation, cease the operation
immediately and disconnect the power plug. Continued operation under suchcircumstances may cause a fire.

 Replace the batteries periodically. Using expired batteries may cause a battery leak,
which will then result in a secondary disaster such as an electric leak, electric shock,smoke or ignition.

4

1

General Precautions

1.5.1

Battery Location

Item
1

1.5.2

Description
Battery x 2 pcs

Battery Replacement Procedure
Refer to “6.1.2 Battery Replacement”.

1.5.3

Battery Life
If this product is to be kept unused or stored for an extended period of time, the batteries must be
removed. Leaving the batteries inside while the product is not in use or being stored for an extended
period of time may impair/shorten the performance/life of the batteries and cause their terminal
corrosion.
The battery life is about two years from the month of manufacture. After two years, replace thebatteries even if they pass the battery voltage test.
“Two years” is only an estimate, and no guarantee is provided. The battery life may vary depending
on several factors including frequency of use, temperature and usage or storage conditions .

In order to prevent serious secondary disasters such as a broken battery case orignition, replace the batteries periodically.

Using expired batteries will cause internal battery degradation, which may disable theunit to operate for designed hours with the backup batteries after power outage, or may
cause an abnormal appearance such as a swollen battery case, battery leak or electric
leak.

5

1

1.5.4

General Precautions

Battery Disposal

Used batteries must be disposed of as hazardous waste in accordance with the applicable laws andregulations,

Do not heat or throw batteries into a fire. Improper handling may lead to explosion.

Do not open or disassemble batteries. Electrolyte is harmful, and its contact with eyesand skin is dangerous.

1.6 Product Disposal
Dispose of the used product in accordance with the applicable laws and regulations.

1.7 Service Life
The service life of this product is 10 years. The unit can operate for up to 10 years with standard
installation and operation in accordance with the NV-120 series instruction manuals for installationand operation. When the service life has expired, replacement is essential for continued reliable
performance and other purposes.

1.8 Definition of Supervisor/Operator/Service Personnel
This manual is intended for personnel concerned with this product, and the personnel are divided
into three categories according to safety level, skills and experience. This manual clearly specifies
the name of the applicable category and shows that the information or instruction given applies tothat category only.
Manages the product operation.
Supervisor

Fully understands the product operation method, entire gas alarm
facility, and gas/fault alarm clearance method.
Should carefully read this manual and be familiar with the systemcharacteristics and relevant work activities.
Operates the product.

Operator

Service personnel

Understands the product operation method, the way to address gas/fault
alarms, and daily work activities for the product under the supervisor’s
instruction.
Carries out installation, failure cause investigation, maintenance andrepair work for the product.
Requires special knowledge and skills.
Acts as New Cosmos authorized technician in principle.

62

Unit Structure

2 Unit Structure
2.1 Package Contents
A standard package consists of the following items. If any items are missing or damaged, pleasecontact New Cosmos or its authorized representative for replacement.

Non-backup power type (Unit with no backup batteries)
Item

Qty.

Description

NV-120 unit

1

Replacement fuse

1*3

250 V 2 A Φ5.2 × 20mm

Wall-mounting kit

1*1

Mounting screws (M5 × 15), pan-headPanel-mounting kit

1*2

x 2 pcs

Mounting bracket S

x 1 pcMounting screws (M5 × 15)
Pan-head, used for attaching bracket to unitx 2 pcs

Tension screw (M6 × 40)
Pan-head, used for attaching bracket to panel

x 2 pcs

Flat-head screwdriver

1*3

Used to open/close the terminal plugs

NV-120 series
instruction manual set

1*3

Instruction manual for installation (GAE-153-xx)
Instruction manual for operation (GAE-154-xx)

x 1 pcx 1 pcNV-120 series
wiring diagram

1*3

Wiring diagram with gas detector (GAE-158-xx)

x 1 pcInspection certificate

1

Ferrite core2

Protect the unit from electrical noise.

Cable tie

2

Used to secure the ferrite core.

Backup power type (Unit with backup batteries)
Item

Qty.

NV-120 unit

1

Replacement fuse

1

Wall-mounting kit

Panel-mounting kit

1*1

1*2

Description
250 V 2 A Φ5.2 × 20mm
Mounting screws (M5 × 15), pan-headx 3 pcs

Upper mounting platex 1 pcLower mounting platex 1 pcMounting screw (M3 × 6)
Flat-head, used for attaching mounting plates to unitx 4 pcs

Mounting bracket B

x 1 pcMounting screws (M5 × 8)
Pan-head, used for attaching bracket to unitx 2 pcs

Tension screw (M6 × 40)
Pan-head, used for attaching bracket to panel

x 2 pcs

Flat-head screwdriver

1*3

Used to open/close the terminal plugs

NV-120 instruction
manual

1*3

Instruction manual for installation
Instruction manual for operation (this document)

Inspection certificate
Ferrite core

1
2

Protect the unit from electrical noise.

Cable tie

2

Used to secure the ferrite core.

*1. Provided when “wall-mounting” was specified at the time of order.
*2. Provided when “panel-mounting” was specified at the time of order.
*3. One screwdriver/manual is provided per order, not per unit.

7

x 1 pcx 1 pc2

Unit Structure

2.2 Unit Dimensions and Components
Main Unit (Exterior Appearance)

2.2.1

Non-backup power typeBackup power type

Component

Description

Item
1

Case

－

2

Cover

－

3

LCD

Shows gas concentration on the display.
Refer to “2.2.3 LCD” for details.

4

Jog dial

Turn to select item or increase/decrease the parameter value.

5

ENT button

6

MENU/CANCEL button

7

BZ STOP/RESET button

8

Green POWER LED

9

Amber FAULT LED

10

Red ALARM LED(mm)

Press and hold to confirm the selection or setting.
Press to increase/decrease the parameter value.
Press to switch to the menu, return to the previous menu or cancel
the current operation.
Its LED flashes when a gas alarm activates.
BZ STOP: Press to mute the audio alarm (beep sound and voicemessage). The flashing LED will become steadily lit.
RESET: Press and hold to clear the peak hold indication and visual
gas alarm. The LED will turn off. The RESET operation isenabled after the audio alarm is muted.
Indicates the operation status.
Not lit when the unit is off.
Flashes when the warm-up is in progress.
Lit when the unit is operating normally.
Indicates the operation status.
Not lit when the unit is operating normally.
Flashes when a fault has been detected.
Indicates the alarm operation status.
Not lit when the warm-up is in progress or unit operates normally.
Flashes when 1st stage gas alarm activates.
Flashes rapidly when 2nd stage gas alarm activates.

82Unit Structure

Item

Component

11

Red MAINT LED

12

Red BATT LED

13

Audio opening

14
15

Battery caseBattery lid

Description
Indicates the maintenance mode status.
Not lit when it is not in the maintenance mode but in normal
operation.
Flashes when the unit is in maintenance mode 1.
Lit when the unit is in maintenance mode 2.
Indicates the backup power status.
Off indicates normal operation. Backup batteries are not used.
Flashing indicates that backup batteries are being used.
On indicates that backup battery failure has been detected.
*This LED is always off when the unit is non-backup power type.
Opening or audio. Gas leak or device fault alarm will be issued bybeep sound and voice message.
Refer to “4.5 Audio Alarms” of NV-120 series instruction manual for
operation.
Comprise a backup power supply unit (backup battery x 2 pcs)

9

2

Main Unit (Interior Appearance)

2.2.2

Do not touch the jumper pins inside. They are for device setting.

Do NOT touch these pin sockets.
They are for setting the jumper pins inside.

Item

Component

Description

1

Power switch

Press to turn on/off the unit.

2

Fuse holder

Houses a 2A fuse.

3

Earth terminal

Used for grounding the unit. Thread size: M4

4Terminal block (4 places)

Used for external wiring.

5

Backup power switch

6

Backup power LED

7

Analog output connector

Turns on/off the backup power supply unit.
*Only available for backup power type unit.
Lit when the backup power switch is in the on position.
Used for checking the analog output.
Applicable connector: ZHR-3 (J.S.T.)

10

Unit Structure

2

Unit Structure

2.2.3

LCD

HOME
（Gas-monitoring）

Target gas: Gas other than oxygen
Item
1
2
3

Component
Gas concentration bar graph
1st stage gas alarm set value
2nd stage gas alarm set value
Unit(unit of measurement)

4

5

AL1 (1st stage gas alarm set value)
AL2 (2nd stage gas alarm set value)
F.S. (full scale value)
Unit of measurement

6

Gas concentration

Target gas: Oxygen

Description
Displays the gas concentration and alarm set values.
Displays the 1st stage gas alarm set value with orange line.
Displays the 2nd stage gas alarm set value with red line.
Displays the unit of measurement for the gas concentration.
Note: “x10” is displayed when the largest value is greater than
the four-digit limit. E.g., If the largest value is 10,000 ppm, then“1000” is displayed for the bar graph with “x10”.
Displays the 1st stage gas alarm set value.
Displays the 2nd stage gas alarm set value.
Displays the full scale value.
Displays the unit of measurement for oxygen concentration.
Displays the oxygen concentration.
Note: This is displayed only when the target gas is oxygen.
This icon is present when the unit is in test mode.
It replaces the lock icon during the test mode.

7

Test icon

8Lock icon

This icon is present when the button/dial operation is locked.

MaintenanceiconThis icon is present when the unit is in maintenance mode 1 or 2.

Warm-up icon

This icon is present when the unit is in warm-up cycle.

Speaker icon

This icon is present when the audio alarm is unmuted/muted.

Voice icon

This icon is present when the voice message is unmuted/muted.

13

ENT iconPress and hold the ENT button for confirmation.

14

Internal processiconThis icon is present when an internal process is in progress.
It replaces the ENT icon during the internal processing.

9

/

10
11
12

/
/

11

2

2.2.4

Unit Structure

Terminal Blocks
Models:Models: NV-120Sx, NV-120Dx

Terminal

Identifier
R (P)

Power
(Input)S (N)E(Earth terminal)
AL1(1st stage gas alarm)
AL2(2nd stage gas alarm)
Fault(Fault alarm)
Buzzer(Alarm sound)
CommonDetector(Power output for pump)
External switch

Detector
4-20mA OUT(Analog output)

ZA1 (ZB1)ZC1ZC2ZA2 (ZB2)
FA (FB)

Description
AC type: 100 to 240 VAC
DC type: 24 VDC (+)
AC type: 100 to 240 VAC
DC type: 24 VDC (-)
Earth
Earth
Thread size: M4
1st stage gas alarm contact output
Normally-open or Normally-closed*1
Common for ZA1 (ZB1)*2
Common for ZA2 (ZB2)*2
2nd stage gas alarm contact output
Normally-open or Normally-closed*1
Fault contact output
Normally-open or Normally-closed*1

BZ

Alarm sound contact output

COM
PA
PB
AR
AS
N
A/F
B, C
C, D
D, F
G
H

Common for Fault and Buzzer contact outputs*2
24 VDC (+)
24 VDC (-)
External switch (button) input

Gas detector*1
Analog output signal (+)
Analog output signal (-)*1. As per delivery specifications.
*2. These common terminals are not connected (individual-common) by default, unless otherwise
specified at the time of order. To connect them (to short-circuit the common lines: shared-common),refer to the attached wiring diagram (GAE-158-xx).

122Unit Structure

Contact Outputs
Outputs to external devices (e.g., signal towers, alarm horns, etc.) are referred as “contact outputs”.

NOTICE
 Contacts use mechanical relays, which can activate on exposure to magnet force.
Install the product in a place free from a magnetic field. Do not use a magnet in thevicinity of the product.
 Contacts use mechanical relays, which can activate on exposure to excessive shockor vibration. Install the product in a place free from shock and vibration. Set a delay
time greater than one second for external devices connected to the product.

 Use the product in a place where the rated load is not exceeded.

13

3

System Configuration

3 System Configuration
This NV-120 unit is paired with a gas detector (sold separately) to form a gas detection system. All
the parts are connected with cables. The unit displays the gas concentration detected by theconnected gas detector and produces audio-visual alarm if the concentration reaches a present
limit.

NV-120Power source
100-240 VAC(24 VDC)

Alarm contacts
External devices
Power source
100 VAC

Analog outputs
Recorder, etc.

Diffusion
type gas
detector

Extractive
type gas
detector

100 VACgas
detector

Typical System Configuration

NOTE One gas detector, diffusion or extractive type, can be connected to each NV-120
unit. Use a protective cover (sold separately) for the gas detector for outdoor
installation. Refer to the gas detector’s instruction manual for details.
 Wiring differs depending on a connected gas detector.
 Refer to the NV-120 series instruction manual for installation for wiring procedure.

14

4Operation

4 Operation
This section provides information and details the procedures for using this product.
 Operation at power-up Operation mode after power-up
 Gas alarm operation and clearance method
 Operation in the event of a fault
 Voice message and beep sound Backup power type specification

4.1 Power-on and Power-off Turn on the product while no gas is present around the connected gas detector.
 Check that all wiring is correct before turning on the external devices (e.g., signal
towers, alarm horns, etc.) connected to this product.

4.1.1

Power-on1

Turn and loosen the knurled screw of the cover counterclockwise. Open the cover.

Hold the cover with your hand while opening/closing it. Flinging the cover may cause
injury or product damage such as a broken LCD.

Knurled screw

15

4

2

Operation

Set the power switch to the on position.

Power switch

NOTE

When the warm-up cycle is completed, the unit will enter the gas-monitoring mode
(normal operation).

Ref.

Refer to “4.2.1 Power-up” for details about the warm-up operation.

3

Check that the backup power switch is in the on position (for your backup power typeunit).

Backup power is not supplied when the backup power switch is in the off position.

4

4.1.2

Close the cover.
Firmly tighten the knurled screw.

Power-off12Turn and loosen the knurled screw of the cover counterclockwise. Open the cover.
Set the power switch to the off position.

Power switch3

Set the backup power switch to the off position (for your backup power type unit).

NOTICE
Backup power continues to be supplied to the unit when the backup power switch is in
the on position, even though the power switch is in the off position. Set the backup
power switch to the off position to completely turn off the unit.

4

Close the cover.
Firmly tighten the knurled screw.

16

4

Operation

4.2 Operation Flow at Power-up
The power-up operation flow is as follows:

Power-up → Warm-up →Gas-monitoring mode (HOME screen)

Ref.

4.2.1

Refer to “4.2.1 Power-up” for information on the warm-up and normal operation.
Refer to “4.3 Gas Alarm Operation” for operation while a gas alarm is activated.

Power-up (Warm-up)

 When the sensor output is not stable, the external relay contact may possibly
activate. To prevent possible activation of the external relay contact after the
warm-up is completed, release the interlocks of the external devices, as needed.
 During the warm-up cycle, the analog signal is fixed at a certain value and theexternal relay contacts are deactivated.

 Zero or span adjustment is not possible during the warm-up cycle. Perform a zero or
span adjustment after the warm-up cycle is completed and the reading becomesstable.
Set the power switch to the on position. The screen will change in the sequence shown below.

Start-up

Warm-up

Normal operation(gas-monitoring mode)*These drawings are just for an example. The screen differs
depending on the delivery specifications.

Indication/output

Power-onGreen POWER LED
Amber FAULT LED

On
On

Red ALARM LED

On

Red MAINT LED
Red BATT LED

On

Analog output
Contacts

Power-up

Normal operation(gas-monitoring mode)On

Warm-upFlashing
Off

Normal operation: Off
1st stage gas alarm: Flashes.
2nd stage gas alarm: Flashes
rapidly.

Off

0mA

Off
Off
Fixed at 4mA, 17.4
ｍA or 10.7mA.*
Inactive*Differs depending on the target gas:
Oxygen (F.S. 25 vol%): 17.4mA
Oxygen (F.S. 50 vol%): 10.7mA

17

Value corresponding to thegas concentration
ActiveOthers: 4mA

4

NOTE

Operation

 Refer to “5.2 Maintenance Mode” for information on the display indication andoutputs during the maintenance mode.
 The warm-up cycle lasts approx. 30 to 600 seconds (as per the delivery
specifications) once the unit is powered.
 If the unit was powered off while in the maintenance mode, it will be in thatmaintenance mode when power is restored once more.

Ref.

Refer to “4.3.1 Gas Alarm Operation during Normal Operation” for gas alarm
operation during the warm-up cycle.

18

4Operation

4.3 Gas Alarm Operation
This section explains the operation when a gas alarm activates as well as the method to clear a gas
alarm.

4.3.1

Gas Alarm Operation during Normal Operation
If the gas concentration or test value exceeds a preset value, a gas alarm will activate.
The background color changes depending on the alarm level. It turns green during normal operation,
turns orange when 1st stage gas alarm activates, and turns red when 2nd stage gas alarm
activates.

Normal Operation

1st stage gas alarm

2nd stage gas alarm*These drawings are just for an example. The screen differs depending on thedelivery specifications.

Normal operation
Indication/output

Green POWER LED(gas-monitoring mode)

Warm-up

Off
Off

Flashing

Background color

Analog output
Contacts

On

Off

Red BATT LED
Bar graph

alarm
On

Red MAINT LED

LCD

2nd stage gas

alarmFlashing

Amber FAULT LED
Red ALARM LED

1st stage gas

Off
Gas concentration

*1

Green

Gas concentration
OrangeRed

Fixed at 4mA, 17.4mA or

Value corresponding to gas

10.7mA*2

concentration

Inactive

Active*3

Beep soundBeeping

Voice message
Sounding*3*1. The value gradually becomes close to zero. If it does not become zero, perform a zeroadjustment while no gas around is present around the gas detector.
*2. Differs depending on the target gas.
Oxygen (F.S. 25vol%): 17.4mA
Oxygen (F.S. 50vol%): 10.7mA
Others: 4mA*3. Can be changed in the settings.

19

4

4.3.2

Operation

Gas Alarm Operation during Maintenance Mode
This section explains the unit operation when a gas alarm activates while in the maintenance mode.
Alarm operation during maintenance modes 1 and 2
If a gas concentration or test value exceeds the alarm set value, a gas alarm will activate.
Indication/output

Maintenance mode 1
Normal operation

Maintenance mode 2

Test mode

Normal operation

Green POWER LED

On

Amber FAULT LED

Off

Test mode

Red ALARM LED

1st stage gas alarm: Flashing

2nd stage gas alarm: Flashing rapidly

Red MAINT LED

FlashingOn

Red BATT LED
Display
*1

LCD

Icon
Analog output

Off
Gas

Test value

concentration

Maintenance

Maintenance icon

& test icons

Value corresponding to gas
concentration

Contacts

Gas concentration
Maintenance icon

Test value
Maintenance &test icons

Fixed at 4mA, 17.4mA or 10.7mA*2

Inactive (disabled)

Beep soundMuted (no beeping)*3

Voice message
Sounding
Muted*1. The background color changes depending on the alarm level. It is lit green during normal
operation, turns orange when 1st stage gas alarm activates, then turns red when 2nd stage gas
alarm activates.
*2. Differs depending on the target gas.
Oxygen (F.S. 25vol%): 17.4mA
Oxygen (F.S. 50vol%): 10.7mA
Others: 4mA*3. Can be changed in the settings.

20

4Operation

4.3.3

Gas Alarm Clearance Method（1） Auto-resetting and Manual-resetting
There are two methods to clear the gas alarm and specified at order placement.
Clearance

Description

methodWhen the gas concentration falls below (exceeds) the “gas alarm set value
Auto-resetting

minus (or plus) 2% of full scale value” after an alarm has been activated, the
ALARM LED, relevant gas alarm icon and alarm contacts will automatically
return to their normal positions/statuses.
Even if the gas concentration falls below (exceeds) the “gas alarm set value
minus (or plus) 2% of full scale value” after an alarm has been activated, the
ALARM LED, relevant gas alarm icon and alarm contacts will not automatically

Manual-resetting

return to their normal positions/statuses.
Pressing and holding the BZ STOP/RESET button cancels a gas alarm when
the actual gas concentration falls below (or exceeds) the “gas alarm set value
minus (or plus) 2% of full scale value”.

（2） Gas Alarm Mode
There are four kinds of gas alarm modes (H-H, L-L, H-L and L-H) and specified at order placement.
modealarm(high- high limit alarm)
H-H limit

H-Llimitmode(high-low limit alarm)
H-L
mode
F.S.

F.S.
AL2
AL1

AL1
Reading in normal ambient air. No gas detected
AL2

Reading in normal ambient air. No gas
detected

L-L mode (low- low limit alarm)
F.S.

4.3.4

L-H mode (low-high limit alarm)
F.S.

Reading in normal ambient air. No gas detected
AL1
AL2

AL2
Reading in normal ambient air. No gas detected
AL1

Peak Hold Function
The highest marked concentration will be maintained as the peak value after a gas alarm has been
activated. Once the peak hold function is activated, the new peak value will be updated andmaintained on the bar graph even if the actual gas concentration falls below that value. The peakhold indication will be cleared when the visual gas alarm is cleared.
Refer to “4.6 BZ STOP/RESET Button” for details on how to clear the visual gas alarm.

21

4Operation

4.4 Operation in Event of FailureThis unit can detect an internal failure. The amber FAULT LED, LCD, and fault contact will activate
depending on the nature of the failure. The corresponding error code will be displayed on the LCD.
Indication/output

Normal operation

In the event of a failure

Green POWER LED

On

Amber FAULT LED

Off

On

Red ALARM LED

Off

Red MAINT LED

Off

Red BATT LED

Off

LCD

“Error code” and “gas concentration”

Gas concentration

displayed alternately

Value corresponding to gas

Analog output

 0.6mA

concentration

Fault contact

Not activated

Activated

Beep soundBeeping*

Voice message

Sounding**Can be changed in the settings.

NOTE

When you contact New Cosmos or its authorized representative for repair, pleaseprovide the error code shown on the LCD.

Ref.

Refer to “7 Error Codes and Solutions” for steps to take in the event of a failure.

4.5 Audio Alarms
In the event of a gas alarm or failure, the unit emits a beeping sound and a voice message to alert
the user. Refer to “4.6 BZ STOP/RESET Button” for the procedure to mute the audio.
Item

Icon

Description
UnmutedTo the right of the icon, letters corresponding to theselected languages are displayed. The 1st language is

Voicemessagedisplayed on the upper line and the 2nd language on thelower line.
J: Japanese, E: English, C: Chinese and K: Korean
Muted

Beep

Unmuted

sound

Muted

22

4

Operation

4.5.1

Voice Message
The unit can select up to two languages (1st and 2nd languages) for voice message. Refer to “5.6.1(4) Spoken Language”.
Example: When Japanese and English are selected as the 1st and 2nd languages respectively, theaudio alarm cycles through in the following sequence if a 1st stage gas alarm is present.
→ 5 beeps → “Gas alarm (in Japanese)” → 5 beeps → “Gas alarm (in English)” →DevicestatusCause
Gas concentration
exceeds the 1ststage gas alarm
set value.
Gas concentration
exceeds the 2ndstage gas alarm
set value.
Main unit failure

1st stagegas alarm

2nd stagegas alarm
Main unit
failureReceived a failure
alarm signal fromthe connected gas
detector.
Main unit function
error

Detector
failureMain unit
error
Adjustment

error
Low flowrate

Gas alarm
duringmaintenance

Fault alarm
duringmaintenanceBattery
voltage test
(Good)
Battery
voltage test
(Not good)

NOTE

Failed to adjust
the sensor.
Received a low
flow rate signal
from theconnected gas
detector.
Test alarm (gasalarm) createdduringmaintenancemode for asimulated
dangerous
situation.
Test alarm (device
fault alarm)
created during
maintenancemode.
Battery voltage
test shows that thebattery condition is
goodBattery voltage
test shows that thebattery voltage
level is low.

Beep
sound

Voice message
Japanese

EnglishChinese



ガス警報
です

Danger!
Gas Alarm气体泄漏警报



ガス警報
ですDanger!
Gas Alarm气体泄漏警报



本体が
故障です

Main unit
failure

报警部故障



検知部が
異常です

Detector
failure

检测器异常



本体エラ
ーです

Main unit
error

报警部功能

본체

异常

에러입니다



調整エラ
ーです

Adjustment
error

调整失败



流量が
異常です

Low flow
rate

流量异常

点検中
です

Test inprogress维护中점검중입니다

点検中ですTest inprogress维护中점검중입니다

正常ですBattery
Okay

电池正常

정상입니다

電圧が
低下して
います

Voltage is
low

电池电压低



The beep sound does not sound when the beep sound function is set to off.

23

Korean
가스
경보입니다
가스
경보입니다
본체
고장입니다
검지기
이상입니다

교정
에러입니다
유량
에러입니다

전압이
낮습니다

4

Operation

4.6 BZ STOP/RESET Button
The BZ STOP/RESET has two key operations.
(1) Audio alarm mute
To mute the audio alarm (beep sound and voice message), press the BZ STOP/RESET button.
● In the event of a gas alarm
The flashing BZ STOP/RESET LED will become steadily lit, and the audio alarm will be muted.
The peak value will be maintained and displayed on the bar graph.
It is possible to mute the audio alarm by using an external switch connected to the unit’s external
switch terminal.

● In the event of a device failure
The flashing BZ STOP/RESET LED will become steadily lit, and the audio alarm will be muted.

● In the event of a device error
The flashing BZ STOP/RESET LED will become steadily lit, and the audio alarm will be muted.
(2) Visual gas alarm clearance
To clear the visual gas alarm, press and hold the BZ STOP/RESET button.
This function is available only when the unit’s gas alarm clearance method is manual-resetting.

NOTE First, press the BZ STOP/RESET button to mute the audio alarm, and then press
and hold it to clear the visual gas alarm. The visual gas alarm cannot be cleared byholding the button while the audio alarm is not muted (while the BZ STOP/RESET
LED is on).

 It is not possible to clear the visual gas alarm (and activated gas alarm contacts) as
long as the actual gas concentration exceeds the gas alarm set value.

24

4Operation

4.7 Backup Power TypeA unit with two backup batteries is referred to as “backup power type”.
In the event of a power outage, the backup batteries will provide emergency power to the unit forcontinuous gas-monitoring during the power outage.
In the event of a power outage, the BATT LED will start flashing, and the backup batteries will
provide power to the unit for continuous gas-monitoring operation.
When the battery voltage decreases and reaches the discharge-cutoff voltage, the unit willautomatically stop battery discharge and then stop operation.
When the power is restored, the BATT LED will turn off and the unit will return to normal operation.
The unit will resume operation with a warm-up cycle when the power is back if it stopped operation
with over-discharged batteries.

 Backup power is not supplied when the backup power switch is in the off position.
Check that the switch is in the on position.

 Perform a battery voltage test and visually check that the BATT LED is not on atleast once a month during the routine check. Refer to “5.4 Battery Voltage Test” forthe test procedure.

4.7.1

BATT LED(For backup power type unit) While the BATT LED is on (steady red), backup power will
not be provided from the backup batteries even if the main power fails, and a gas leakwill not be properly alerted. If the BATT LED turns on, contact New Cosmos or its
authorized representative for repair.
The BATT LED is always off when the unit is non-backup power type.
Green

Red

POWER LED

BATT LEDOn

Off

ActiveOn

Flashing

ActiveBackup batteries failure

On

On

Power is restored

On

Off

Batteries discharged

Off

Off

Condition
Normal operation
Power fails and backup
power is provided.

25

Gas alarm function

Inactive during power outage(Batteries need to be repaired)
ActiveInactive(Batteries need to be charged)

4

4.7.2

Operation

Continuous and Intermittent Gas-monitoring Modes
Models: NV-120Ci and NV-120Cv
The unit will continue gas-monitoring for 120 minutes after a power outage breaks out, followed byintermittent gas-monitoring (10-second gas-monitoring at 15-minute intervals). However, if the unit
falls into a gas alarm status during the intermittent gas-monitoring mode, the mode will switch to thecontinuous gas-monitoring mode.
*1. When an extractive type gas detector is connected, the intermittent gas-monitoring duration will
be shortened.
*2. Gas alarm accuracy is compromised during the intermittent gas-monitoring mode, since thesensor output becomes unstable during the intermittent gas-monitoring mode, as a result, a gas
alarm may be activated even though the concentration does not reach the gas alarm set value.
Expected gas-monitoring durations are listed below. They are just an estimate, and no guarantee isprovided.
Continuous gas-monitoring duration
Intermittent gas-monitoring duration
Qty. of
Diffusion type gas
Extractive type gas
Diffusion type gas
Extractive type gas
batteries
detector connected
detector connected
detector connected
detector connected
2 pcs
120 minutes
Max. 7 days
Max. 2 days
During normal operation---<------------------------ Power outage is occurring --------------------------------->
Continuous gas-monitoring

Normal gas-monitoringby backup batteries

Intermittent gas-monitoring by backup batteries

Monitoring

Max. 7days

120 min.

Monitoring stopped

In the event of a gas alarm during the intermittent gas-monitoring mode<------------------------ Power outage is occurring --------------------------------->
Continuous gas-monitoring

Normal gas-monitoringby backup batteries

Intermittent gas-monitoring by backup batteries

Monitoring
Gas
Alarm
!

120 min.

Monitoring stopped

Models other than NV-120Ci and NV-120Cv
The continuous gas-monitoring will continue for more than120 minutes after a power outage starts.
The duration differs depending on the delivery specifications. Expected gas-monitoring durations
are listed below. They are just an estimate, and no guarantee is provided.
Continuous gas-monitoring duration
Diffusion type gas detector connected
Extractive type gas detector connected
More than 120 minutes<------------------------ Power outage is occurring --------------------------------->
Normal gas-monitoring

Continuous gas-monitoring by backup
batteries

Batteries depleted

Monitoring

More than 120 min.

Monitoring stopped

26

5Operation Menus

5 Operation Menus
5.1 Overview of Operation Menus
This product has the menus shown in the table below.
Menu

Description
Sets the maintenance mode to:

Maintenance Mode

Off: Maintenance mode is off.
Maint.1: Maintenance mode 1 is on.
Maint.2: Maintenance mode 2 is on.

Test Mode
Battery Voltage Test
Calibration Menu
Device Setting Menu

5.1.1

Manually changes the test value (gas concentration) to start an alarm test.
Checks the battery life expectancy.
*Not available for non-backup power type unit.
Performs calibrations such as zero/span adjustments.
Changes the languages for voice message, alarm volume, and alarm set
values or turns on/off (mute/unmute) the audio.

Information

Displays set information (e.g., full scale, alarm set values) and event history.

Manufacturer Mode

Only for supervisor/service personnel use. Not for operator use.

Buttons and Dial
The following buttons and dial are used for operation.

Item

Component

1

Jog dial

2

ENT button

3

MENU/CANCEL button

NOTE

Slowly and firmly press the button or turn the jog dial. The unit may not react to too
soft or too fast press or turn.

27

5

5.1.2

Operation Menus

Access to Main Menu
To go to the Main Menu, press the MENU/CANCEL button while on the HOME screen.

NOTE If the lock icon is displayed on the top left corner of the screen, the menus arelocked. The safety lock must be deactivated (unlocked) in order to access themenus.
 The safety lock will activate (locked) after 3 minutes if left idle while on the HOME
screen.

Ref.

Refer to “5.1.5 Deactivate Safety Lock” for the lock deactivation procedure.

Deactivate the safety lock by simultaneously holding the
MENU/CANCEL and ENT buttons.
Press the MENU button to go to the Main Menu.

HOME

Maintenance

Test Mode

Battery Voltage Test

Calibration

Main Menu
Select a menu andpress the ENT
button to confirm
the selection.
Device Setting Menu

5.1.3

Information

Manufacturer Mode

Select Item in Menu
Turning the jog dial cycles through the item options shown on each menu.
Select the desired item, then enter the ENT button to access/operate that item.
To return to the previous screen, press the CANCEL button.

28

Turn the jog dial
to cycle throughitem options.

5

Operation Menus

5.1.4

Menu Operation
Turn the jog dial to select a desired item.
The selected item is highlighted in white.
Enter the ENT button to confirm the selection and access that item.
Turn the jog dial to operate each item.
Press the ENT button for confirmation.
To return to the previous step, press the CANCEL button.

Menus Overview

Maintenance Mode

Manufacturer Mode

Calibration Menu

Zero adjustment
Span adjustment etc.

Test Mode

Device Setting Menu

Device Setting- Alarm Volume- Voice Message
on/off- Beep Sound on/off- Spoken Language
Alarm Setting- AL1 Set Value- AL2 Set Value

Battery Voltage Test

Information

Configuration Data
- Device Serial No.
- Mfg. Date
- Fullscale Value- AL1 Set Value- AL2 Set Value- Voice Message
On/Off Status- Alarm Volume- 1st Language- 2nd Language- Main Software ver.
Event History

29

5

5.1.5

Operation Menus

Deactivate Safety Lock
The safety lock disables the buttons and the jog dial to prevent unintended operation.
The lock icon is shown on the top left corner of the screen while the lock is activated (locked).

To deactivate the safety lock, simultaneously press and hold the MENU/CANCEL and ENT buttons
until the lock icon disappears.

5.2 Maintenance Mode
The maintenance mode is used to deactivate all analog outputs and relay contacts during
maintenance or inspection work. There are two kinds of maintenance modes that can be selected
as per requirement.

NOTICEThe maintenance icon is displayed during the maintenance mode. The unit will automatically
return to the gas-monitoring mode (normal operation) after 8 hours, regardless of whether it wasleft idle or not.
Maintenance Mode Operation

Mode

Icon

MAINT LED

Contacts－

Off

ActiveGas concentration

Maintenance 1

Flashing

Inactive

Gas concentration

Maintenance 2

On

Inactive

Fixed at 4mA, 17.4mA or 10.7mA*

Off*Differs depending on the target gas.
Oxygen (F.S. 25vol%): 17.4mA
Oxygen (F.S. 50vol%): 10.7mA
Others: 4mA

30

Analog output

5Operation Menus

5.2.1

Enter Maintenance Mode

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select the maintenance mode.
The selected item will be highlighted in white.

3
4

Press the ENT button.
Turn the jog dial to select the mode.
The selected item will be highlighted in white.

“Maintenance mode 1” is selected (highlighted in white).
Maintenance Mode
On screen item

Description

Off

Gas-monitoring mode (normal operation)

Maint.1

Maintenance mode 1

Maint.2

Maintenance mode 2

31

5

5

Press and hold the ENT button for confirmation.
The selected mode will be set, and the screen will return to the Main Menu.

“Maintenance mode 1” is on, and the corresponding icon is displayed.

5.2.2

Exit Maintenance Mode

1

Select the maintenance mode while Maintenance mode 1 or 2 is on.

2Turn the jog dial to select “Off”.

32

Operation Menus

5

Operation Menus

3

Press and hold the ENT button.
The maintenance mode will be cancelled and the screen will return to the Main Menu.

NOTE

Up to step 2, it is possible to cancel the operation by pressing the CANCEL button.
The screen will return to the Main Menu.

5.3 Test Mode
The test mode is used to increase or decrease a simulated gas concentration value to activate an
alarm for maintenance/test purpose.

NOTICE While in the test mode, the external relay contacts and analog output are active. Set
the unit to the maintenance mode or release the interlocks of external devices, as
needed, before using the test mode.

 The unit will automatically return to the gas-monitoring mode (normal operation)
after the test mode lasts for 10 minutes, regardless of whether it was left idle or not.

 The unit cannot enter the test mode during the warm-up cycle.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select the test mode.
The selected item will be highlighted in white.

33

5

3

Press the ENT button.
The unit will enter the test mode.

NOTE

4

Operation Menus

The simulated gas concentration (test value) is “0” by default.
The simulated oxygen concentration (test value) is “20.9 vol%” by default.

Turn the jog dial to set the reading (test value) to a desired value.
The reading can be changed from –10% to 110% of the full scale.

Button Operation
Button/dialOperation

ENT button

Press and hold to save the test value.

MENU/CANCEL button

Press to cancel the current operation and return to the Main Menu screen.

Jog dial

Turn to adjust the test value.

NOTE

When the full scale is 100 ppm, the reading can be changed from –10 ppm to 110 ppm
instead of from –10% to 110%.

34

5Operation Menus

5

To exit the test mode, press and hold the ENT button or press the CANCEL button.
 If the CANCEL button is pressed, the test value will not be saved and the screen will returnto the Main Menu.
 If the ENTER button is held down, the screen will move to the confirmation screen shown
below.
To save the test value, select “OK” and press the ENT button.
To go back to the previous step, select “Cancel” and press the ENT button.

5.4 Battery Voltage Test
This function is used to estimate the remaining battery life.
Only available for backup power type unit.

NOTICE The battery level may not be good enough before the initial power-up. Up to 24 hours isneeded to fully charge the batteries. If the battery voltage test result is not “OK”, perform thetest again 24 hours later.

 The battery test is not possible while the backup batteries are being used (BATT LED is
flashing).

 Once the battery voltage test starts, it cannot be cancelled.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Battery Voltage Test”.
The selected item will be highlighted in white.

35

5

3

Operation Menus

Press the ENT button.
The battery voltage test will start.
“Testing in progress” is displayed during the battery voltage test.

When the battery voltage test is completed, the test result will be displayed.

Good

Message on screen
OK
Please charge
the batteries
Voltage is low

Charge needed

Replacement needed

Battery condition
Good

Description
Batteries are good.
Battery level is low. Charge the batteries. If it does

Charge is needed.

not improve after charging, it indicates that theend of the battery life is approaching.

Replacement is needed.

Battery voltage is very low. Replace the batteries
with new ones.

*1. Contact New Cosmos service personnel for battery replacement.
*2. Replace the batteries with new ones if used over two years, regardless of the frequency of use.

4

Press the CANCEL button.
The battery voltage test will end.

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5Operation Menus

5.5 Calibration Menu
The Calibration Menu is used to perform zero and span adjustments on this product.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Calibration Menu”.
The selected item will be highlighted in white.

3

Press the ENT button.
The unit will enter the Calibration Menu.

Calibration Menu
Target gas
Item

Function

Other thanoxygenManual Zero Adj.

Manually performs a zero adjustment.

Auto Zero Adj.

Automatically performs a zero adjustment



Manual Span Adj.

Manually performs a span adjustment.

Span Adj. (fixed)
Auto Span Adj.

Sets the span to the fixed value (1st stage
gas alarm set value x 1.6 times).
Performs a span adjustment by using peakhold function.

OxygenSpan Adj. (20.9 vol%)Sets the span to 20.9 vol%.



Clear Span Adj. (20.9 vol%)Clears the 20.9 vol% span.



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NOTE

Operation Menus

 For units with a zero suppression (or 20.9 suppression) function, the bar graphdisplay will continue to indicate “0” (or 20.9 vol%) until the target gas concentration
detected by the detector exceeds the pre-set value. The pre-set value is given in
the delivery specifications.
 For NV-120Mx units, the 20.9 suppression is disabled if connected with an oxygen
detector (e.g., KD-12O).

NOTICEFor “NV-120Mx” and “NV-120Dx” units, perform zero and span adjustments in the connected gas
detector, unless the zero/span adjustment function is not available in the gas detector. If the zero
point of this product itself drifts, perform zero and span adjustments on this product.

5.5.1

Manual Zero Adj.
This is to manually adjust the reading to zero.

NOTICE If the connected gas detector has not been energized for a period of time (e.g., fromfactory to initial power-up), it may take some time for the gas concentration reading(sensor output) to stabilize.
 For NV-120Mx, NV-120Sx and NV-120Dx units, perform a zero adjustment in theconnected gas detector. However, if a zero adjustment was performed in the gas
detector but the reading of this product does not show zero, perform a zeroadjustment on this product.

 Once the zero adjustment is started, it cannot be cancelled.

 Perform a zero adjustment while the connected gas detector is in clean air.
Proper gas detection is not possible if a zero adjustment is performed in a gas
atmosphere.
 Perform a zero adjustment at the initial power-up or sensor replacement.

 During the zero adjustment, the external relay contacts are active. Before
performing a zero adjustment, set the unit to the maintenance mode or release theinterlocks of external devices, as needed.

 Zero or span adjustment is not possible during the warm-up cycle. Perform a zero or
span adjustment after the warm-up cycle is completed and the reading becomesstable.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Calibration Menu”.
The selected item will be highlighted in white.

3

Press the ENT button.
The unit will enter the Calibration Menu.

4

Select Manual Zero Adj.
The selected item will be highlighted in white.

5

Press the ENT button.
The unit will enter the Manual Zero Adj. screen.

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Operation Menus

Item

Component

Description/function

1

Reading

Displays the currently measured gas concentration.

2

Increment/decrement unit

Displays the increment/decrement unit.

Button Operation
Button/dialOperation
Press to change the increment/decrement unit. Each press of the ENT

ENT button

button cycles through unit options (1, 5, 10, 100, 1000).
Press and hold to confirm the setting.

MENU/CANCEL button
Jog dial

6

Press to cancel the current operation and return to the Main Menu
screen.
Turn to adjust the reading.

With the jog dial and the ENT button, adjust the reading to “0”.

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7

Press and hold the ENT button for confirmation.
To execute, select “OK”.
To return to the previous step, select “Cancel”.

8

Select “OK” and press the ENT button.
A zero adjustment will start.
“Adjustment now...” is displayed while zero adjustment is in progress.

A successfully completed zero adjustment displays the following screen.

9

Press the CANCEL button.
The screen will return to the Calibration Menu.

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Operation Menus

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Operation Menus

NOTE

 Up to step 7, it is possible to cancel the zero adjustment by pressing the CANCEL
button.

 If error code “E-19” or “E-20” is displayed, refer to “7 Error Codes and Solutions”.

5.5.2

Auto Zero Adj.
This is to automatically adjust the reading to zero.

NOTICE If the connected gas detector has not been energized for a period of time (e.g., fromfactory to initial power-up), it may take some time for the gas concentration reading(sensor output) to stabilize.

 For NV-120Mx, NV-120Sx and NV-120Dx units, perform a zero adjustment in theconnected gas detector. However, if a zero adjustment was performed in the gas
detector but the reading of this product does not show zero, perform a zeroadjustment on this product.

 Once the zero adjustment is started, it cannot be cancelled.

 Perform a zero adjustment while the connected gas detector is in clean air.
Proper gas detection is not possible if a zero adjustment is performed in a gas
atmosphere.
 Perform a zero adjustment at the initial power-up or sensor replacement.

 During the zero adjustment, the external relay contacts are active. Before
performing a zero adjustment, set the unit to the maintenance mode or release theinterlocks of external devices, as needed.

 Zero or span adjustment is not possible during the warm-up cycle. Perform a zero or
span adjustment after the warm-up cycle is completed and the reading becomesstable.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Calibration Menu”.
The selected item will be highlighted in white.

3

Press the ENT button.
The unit will enter the Calibration Menu.

4

Select “Auto Zero Adj.”.
The selected item will be highlighted in white.

5

Press the ENT button.
The unit will enter the Auto Zero Adj. screen.

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6

Operation Menus

Select “OK” and press the ENT button.
A zero adjustment will start.
“Adjustment now...” is displayed while zero adjustment is in progress.

A successfully completed zero adjustment displays the following screen.

7

Press the CANCEL button.
The screen will return to the Calibration Menu.

NOTE

 Up to step 5, it is possible to cancel the zero adjustment by pressing the CANCEL
button.

 If error code “E-19” or “E-20” is displayed, refer to “7 Error Codes and Solutions”.

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Operation Menus

5.5.3

Manual Span Adj.
This is to perform a span adjustment by using calibration gas.

NOTICE A span adjustment requires a special attention because actual gas is used. It mustbe performed by New Cosmos authorized service personnel.

 For NV-120Mx, NV-120Sx and NV-120Dx units, perform a span adjustment in theconnected gas detector.

 Once the span adjustment is started, it cannot be cancelled.
Optional items required for a span adjustment vary depending on the gas type. Refer to the
instruction manual for the gas detector.

 Perform a span adjustment after a zero adjustment.
 Perform a span adjustment at the initial power-up or sensor replacement.

 During the span adjustment, the external relay contacts are active. Before
performing a span adjustment, set the unit to the maintenance mode or release theinterlocks of external devices, as needed.

 Zero or span adjustment is not possible during the warm-up cycle. Perform a zero or
span adjustment after the warm-up cycle is completed and the reading becomesstable.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Calibration Menu”.
The selected item will be highlighted in white.

3

Press the ENT button.
The unit will enter the Calibration Menu.

4

Select “Manual Span Adj.”.
The selected item will be highlighted in white.

5

Press the ENT button.
The unit will enter the Manual Span Adj. screen.

6

Set the target reading (Target Value) to the calibration gas concentration with the jog dial
and the ENT button.

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Item
1

Component
Current reading2

Current bar graph3
4

Target reading
Target bar graph
Increment/decrement
unit

5

Button Operation
Button/dial
ENT button
MENU/CANCEL button
Jog dial

7

Operation Menus

Description/function
Displays the currently measured gas concentration.
Displays the currently measured gas concentration in bar graphform.
Displays the target reading. Set the target reading with jog dial.
Displays the target reading in bar graph form.
Displays the increment/decrement unit.

Operation
Press to change the increment/decrement unit. Each press of the ENT
button cycles through unit options (1, 5, 10, 100, 1000).
Press and hold to confirm the setting.
Press to cancel the current operation and return to the Main Menu
screen.
Turn to set the target reading.

Apply calibration gas to the gas detector (sensor) and allow the gas concentration to
become fully stable.
The gas concentration will be displayed.

8

When the displayed gas concentration becomes stable, press the ENT button.
To execute, select “OK”.
To return to the previous step, select “Cancel”.

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5Operation Menus

9

Select “OK” and press the ENT button.
A span adjustment will start.
“Adjustment now...” is displayed while span adjustment is in progress.

A successfully completed span adjustment displays the following screen.

10 Press the CANCEL button.
The screen will return to the Calibration Menu.

NOTE

 Up to step 8, it is possible to cancel the zero adjustment by pressing the CANCEL
button.

 If error code “E-17” or “E-18” is displayed, refer to “7 Error Codes and Solutions”.

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5.5.4

Operation Menus

Span Adj. (fixed)
This is to perform a span adjustment by using the calibration gas 1.6 times higher than the 1st stage
gas alarm set value.

NOTICE A span adjustment requires a special attention because actual gas is used. It mustbe performed by New Cosmos authorized service personnel.
 For NV-120Mx, NV-120Sx and NV-120Dx units, perform a span adjustment in theconnected gas detector

 The target value can be changed from 0% to 100% of the full scale. If 1.6 times
higher than the 1st stage gas alarm set value exceeds the 100% full scale value,
the span will be automatically adjusted to the 100% full scale value.

 Once the span adjustment is started, it cannot be cancelled.
Optional items required for a span adjustment vary depending on the gas type. Refer to the
instruction manual for the gas detector.

 Perform a span adjustment after a zero adjustment.
 Perform a span adjustment at the initial power-up or sensor replacement.

 During the span adjustment, the external relay contacts are active. Before
performing a span adjustment, set the unit to the maintenance mode or release theinterlocks of external devices, as needed.

 Zero or span adjustment is not possible during the warm-up cycle. Perform a zero or
span adjustment after the warm-up cycle is completed and the reading becomesstable.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Calibration Menu”.
The selected item will be highlighted in white.

3

Press the ENT button.
The unit will enter the Calibration Menu.

4

Select “Span Adj. (fixed)”.
The selected item will be highlighted in white.

5

Press the ENT button.
The unit will enter the Span Adj. (fixed) screen.

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Operation Menus

6

Apply the calibration gas (1.6 times higher than the 1st stage gas alarm set value) to thegas detector (sensor) and allow the gas concentration to become fully stable.

Item

Component

1

Current reading2

Current bar graph3

Target reading

4

Target bar graph

7

Description/function
Displays the currently measured gas concentration.
Displays the currently measured gas concentration in bar
graph form.
Displays a value 1.6 times higher than the 1st stage gas
alarm set value.
Displays a value 1.6 times higher than the 1st stage gas
alarm set value in bar graph form.

When the displayed gas concentration becomes stable, press the ENT button.
To execute, select “OK”.
To return to the previous step, select “Cancel”.

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8

Operation Menus

Select “OK” and press the ENT button.
A span adjustment will start.
“Adjustment now...” is displayed while span adjustment is in progress.

A successfully completed span adjustment displays the following screen.

9

Press the CANCEL button.
The screen will return to the Calibration Menu.

NOTE

 Up to step 7, it is possible to cancel the zero adjustment by pressing the CANCEL
button.

 If error code “E-17” or “E-18” is displayed, refer to “7 Error Codes and Solutions”.

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Operation Menus

5.5.5

Auto Span Adj.
This is to perform a span adjustment by using calibration gas.

NOTICE A span adjustment requires a special attention because actual gas is used. It mustbe performed by New Cosmos authorized service personnel.

 For NV-120Mx, NV-120Sx and NV-120Dx units, perform a span adjustment in theconnected gas detector.
Optional items required for a span adjustment vary depending on the gas type. Refer to the
instruction manual for the gas detector.

 Perform a span adjustment after a zero adjustment.
 Perform a span adjustment at the initial power-up or sensor replacement.

 During the span adjustment, the external relay contacts are active. Before
performing a span adjustment, set the unit to the maintenance mode or release theinterlocks of external devices, as needed.

 Zero or span adjustment is not possible during the warm-up cycle. Perform a zero or
span adjustment after the warm-up cycle is completed and the reading becomesstable.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Calibration Menu”.
The selected item will be highlighted in white.

3

Press the ENT button.
The unit will enter the Calibration Menu.

4

Select “Auto Span Adj.”
The selected item will be highlighted in white.

5

Press the ENT button.
The unit will enter the Auto Span Adj. screen.

6

Set the target reading (Target Value) to the calibration gas concentration with the jog dial
and the ENT button.

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Item

Component

Operation Menus

Description/function

1

Current reading

Displays the currently measured gas concentration.

2

Current bar graph3

Target reading

Displays the target reading. Set the target reading with jog dial.

4

Target bar graph

Displays the target reading in bar graph form.

5

Increment/decrement unit

Displays the increment/decrement unit.

Displays the currently measured gas concentration in bar graphform.

Button Operation
Button/dialOperation
Press to change the increment/decrement unit. Each press of the ENT

ENT button

button cycles through unit options (1, 5, 10, 100, 1000).
Press and hold to confirm the setting.

MENU/CANCEL button

Press to cancel the current operation and return to the Main Menu screen.

Jog dial

Turn to set the target reading.

7

Press and hold the ENT button for confirmation.
To execute, select “OK”.
To return to the previous step, select “Cancel”.

8
9Select “OK” and press the ENT button.
Apply calibration gas to the gas detector (sensor).
“Adjustment now...” is displayed while span adjustment is in progress.

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5Operation Menus

A successfully completed span adjustment displays the following screen.

10 Press the CANCEL button.
The screen will return to the Calibration Menu.

NOTE

 Up to step 7, it is possible to cancel the zero adjustment by pressing the CANCEL
button.

 If error code “E-17” or “E-18” is displayed, refer to “7 Error Codes and Solutions”.

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5.5.6

Operation Menus

Span Adj. (20.9 vol%)This is to automatically set the span to 20.9 vol%. It is used only when the target gas is oxygen.

NOTICE A span adjustment requires a special attention because actual gas is used. It mustbe performed by New Cosmos authorized service personnel.

 For NV-120Mx, NV-120Sx and NV-120Dx units, perform a span adjustment in theconnected gas detector.

 Once the span adjustment is started, it cannot be cancelled.
Optional items required for a span adjustment vary depending on the gas type. Refer to the
instruction manual for the gas detector.

 At initial power-up or sensor replacement, perform a clear-span adjustment (refer to“5.5.7 Clear Span Adj.”) before a span adjustment.

 During the span adjustment, the external relay contacts are active. Before
performing a span adjustment, set the unit to the maintenance mode or release theinterlocks of external devices, as needed.

 Zero or span adjustment is not possible during the warm-up cycle. Perform a zero or
span adjustment after the warm-up cycle is completed and the reading becomesstable.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Calibration Menu”.
The selected item will be highlighted in white.

3

Press the ENT button.
The unit will enter the Calibration Menu.

4

Select “Span Adj. (20.9 vol%)”.
The selected item will be highlighted in white.

5

Press the ENT button.
The unit will enter the Span Adj. (20.9 vol%) screen.

6

Check that the gas detector (sensor) is in clean air.

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Item
1

Component
Current reading2

Current bar graph3
4

Target reading
Target bar graph

7

Description/function
Displays the currently measured gas concentration.
Displays the currently measured gas concentration in bar
graph form.
Displays the target reading “20.9%”.
Displays the target reading in bar graph form.

Press the ENT button.
To execute, select “OK”.
To return to the previous step, select “Cancel”.

A span adjustment will start.
“Adjustment now...” is displayed while span adjustment is in progress.

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Operation Menus

A successfully completed span adjustment displays the following screen.

8

Press the CANCEL button.
The screen will return to the Calibration Menu.

NOTE

 Up to step 7, it is possible to cancel the zero adjustment by pressing the CANCEL
button.
 If error code “E-17” or “E-18” is displayed, refer to “7 Error Codes and Solutions”.

5.5.7

Clear Span Adj. (20.9 vol%)This is to clear the 20.9 vol% span. It is used only when the target gas is oxygen.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Calibration Menu”.
The selected item will be highlighted in white.

3

Press the ENT button.
The unit will enter the Calibration Menu.

4

Select “Clear Span Adj. (20.9 vol%).
The selected item will be highlighted in white.

5

Press the ENT button.
The unit will enter the Clear Span Adj. (20.9 vol%) screen.

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Operation Menus

Button Operation
Button/dial
ENT button
MENU/CANCEL button
Jog dial

Operation
Press and hold to confirm the selection.
Press to cancel the current operation and return to the Calibration
Menu.
Turn to select the desired item.

6

Turn the jog dial to select “Yes”.

7

Press and hold the ENT button to confirm the selection.
To execute, select “OK”.
To return to the previous step, select “Cancel”.

8

Select “OK” and press the ENT button.
The 20.9 vol% span will be cleared.

9

The screen will return to the Device Setting screen.

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5Operation Menus

5.6 Device Setting Menu
From the Device Setting Menu, it is possible to adjust device and alarm setups.

This menu should only be operated by supervisor. Incorrect setting may cause
incorrect operation.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Device Setting Menu”.
The selected item will be highlighted in white.

3

Press the ENT button.
The unit will enter the Device Setting Menu.

Device Setting Menu
Item

5.6.1

Description/function

Device Setting

Makes setups for the device.

Alarm Setting

Makes setups for the alarm.

Device SettingThis is to make setups for audio alarm.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Device Setting Menu”.
The selected item will be highlighted in white.

3

Press the ENT button.
The unit will enter the Device Setting Menu.

4

Select “Device Setting”.
The selected item will be highlighted in white.

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5Operation Menus

5

Press the ENT button.
The unit will enter the Device Setting screen.
There are the following five items.
Item

Description/function

Alarm Volume

Adjusts the sound level of beeping and voice message.

Voice Message

Turns on/off (unmute/mute) the voice message.

Beep Sound

Turns on/off (unmute/mute) the beep sound.

Spoken Language

Sets the languages for voice message.

（1） Alarm Volume
This item is used to adjust the sound level of beep sound and voice message.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Device Setting Menu”.
The selected item will be highlighted in white.

3

Press the ENT button.
The unit will enter the Device Setting Menu.

4

Select “Device Setting”.
The selected item will be highlighted in white.

5

Press the ENT button.
The unit will enter the Device Setting screen.

6

Select “Alarm Volume”
The selected item will be highlighted in white.

7

Press the ENT button.
The unit will enter the Alarm Volume screen.

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Operation Menus

Button Operation
Button/dial
ENT button

Operation
Press to view the value.
Press and hold to confirm the set value.

MENU/CANCEL button

Press to cancel the current operation and return to the Device Setting
screen.

Jog dial

Turn to set the value.

89Turn the jog dial to set the value.
Press and hold the ENT button.
To execute, select “OK”.
To return to the previous step, select “Cancel”.

10 Select “OK” and press the ENT button.
The setting will be saved.

11 The screen will return to the Device Setting screen.
（2） Voice Message On/Off
This item is used to turn on/off (unmute/mute) the voice message.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Device Setting Menu”
The selected item will be highlighted in white.

3

Press the ENT button.
The unit will enter the Device Setting Menu.

4

Select “Device Setting”.
The selected item will be highlighted in white.

5

Press the ENT button.
The unit will enter the Device Setting screen.

6

Select “Voice Message”
The selected item will be highlighted in white.

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5Operation Menus

7

Press the ENT button.
The unit will enter the Voice Message screen.

Button Operation
Operation

Button/dial
ENT button

Press and hold to confirm the selection or setting.

MENU/CANCEL
buttonPress to cancel the current operation and return to the Device Setting
screen.

Jog dial

Turn to select the desired item.

89Turn the jog dial to select the desired item: On or Off.
Press and hold the ENT button for confirmation.
To execute, select “OK”.
To return to the previous step, select “Cancel”.

10 Select “OK” and press the ENT button.
The selection (voice message on/off status) will be saved.

11 The screen will return to the Device Setting screen.

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5Operation Menus（3） Beep Sound On/Off
This item is used to turn on/off (unmute/mute) the beep sound.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Device Setting Menu”.
The selected item will be highlighted in white.

3

Press the ENT button.
The unit will enter the Device Setting Menu.

4

Select “Device Setting”
The selected item will be highlighted in white.

5

Press the ENT button.
The unit will enter the Device Setting screen.

6

Select “Beep sound”.
The selected item will be highlighted in white.

7

Press the ENT button.
The unit will enter the Beep Sound screen.

Button Operation
Button/dialOperation

ENT button

Press and hold to confirm the selection.

MENU/CANCEL
buttonPress to cancel the current operation and return to the Device Setting
screen.

Jog dial

Turn to select the desired item.

89Turn the jog dial to select the desired item: On or Off.
Press and hold the ENT button for confirmation.
To execute, select “OK”.
To return to the previous step, select “Cancel”.

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5Operation Menus

10 Select “OK” and press the ENT button.

The selection (beep sound on/off status) will be saved.

11 The screen will return to the Device Setting screen.
（4） Spoken Language
This item is used to select the languages for voice message.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Device Setting Menu”.
The selected item will be highlighted in white.

3

Press the ENT button.
The unit will enter the Device Setting Menu.

4

Select “Device Setting”.
The selected item will be highlighted in white.

5

Press the ENT button.
The unit will enter the Device Setting screen.

6

Select “Spoken Language”
The selected item will be highlighted in white.

7

Press the ENT button.
The unit will enter the Spoken Language screen.

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Button Operation
Button/dial
ENT button

Operation Menus

Operation
Press to move to the next screen.
Press and hold to confirm the selection or setting.

MENU/CANCEL button

Press to cancel the current operation and return to the Device Setting
screen.

Jog dial

Turn to select the desired item.

89Turn the jog dial to select the desired 1st language.
Press the ENT button.
The unit will enter the 2nd language selection mode.

10 Turn the jog dial to select the desired 2nd language.

11 Press and hold the ENT button for confirmation.
To execute, select “OK”.
To return to the previous step, select “Cancel”.

12 Select “OK” and press the ENT button.
The selection (spoken languages) will be saved.

13 The screen will return to the Device Setting screen.

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5.6.2

Alarm SettingThis is to set the alarm set values.

NOTICEThe alarm set values cannot be set while a gas alarm is activated.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Device Setting Menu”.
The selected item will be highlighted in white.

3

Press the ENT button.
The unit will enter the Device Setting Menu.

4

Select “Alarm Setting” with the jog dial.
The selected item will be highlighted in white.

5

Press the ENT button.
The unit will enter the Alarm Setting screen.

There are two option items below.
Item
Description
AL1 Set Value

AL2 Set Value

Ref.

Sets the 1st stage gas
alarm Set value.
Sets the 2nd stage gas
alarm Set value.

Settable range
H-H mode: 5% of F.S.  Set value  AL2
L-L mode: AL2  Set value  F.S. value
H-L mode: AL2  Set value  F.S. value
L-H mode: 0  Set value  AL2
H-H mode: AL1  Set value  F.S. value
L-L mode: 0  Set value  AL1
H-L mode:0  Set value  AL1
L-H mode: AL1  Set value  F.S. value

Refer to “4.3.3 (2)” for more information about the gas alarm mode.

（1） AL1 Set Value
This sets the 1st stage gas alarm set value.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Device Setting Menu”.
The selected item will be highlighted in white.

3

Press the ENT button.
The unit will enter the Device Setting Menu.

4

Select “Alarm Setting”.
The selected item will be highlighted in white.

5

Press the ENT button.
The unit will enter the Alarm Setting screen.

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6

Select “AL1 Set Value”
The selected item will be highlighted in white.

7

Press the ENT button.
The unit will enter the AL1 Set Value screen.

Item

Component

Operation Menus

Description/function

1

1st stage gas alarm set value

Sets the 1st stage gas alarm set value.

2

Increment/decrement unit

Displays the increment/decrement unit.

Button Operation
Button/dial
ENT button

Operation
Press to change the increment/decrement unit. Each press of the ENT
button cycles through unit options (1, 5, 10, 100, 1000).
Press and hold to confirm the setting.

MENU/CANCEL
buttonPress to cancel the current operation and return to the Alarm Setting
screen.

Jog dial

Turn to adjust the value.

89Turn the jog dial to set the value.
Press and hold the ENT button for confirmation.
To execute, select “OK”.
To return to the previous step, select “Cancel”.

645Operation Menus

10 Select “OK” and press the ENT button.
The 1st stage gas alarm set value will be set.

11 The screen will return to the Alarm Setting screen.
（2） AL2 Set Value
This sets the 2nd stage gas alarm set value.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Device Setting Menu”.
The selected item will be highlighted in white.

3

Press the ENT button.
The unit will enter the Device Setting Menu.

4

Select “Alarm Setting”.
The selected item will be highlighted in white.

5

Press the ENT button.
The unit will enter the Alarm Setting screen.

6

Select “AL2 Set Value”.
The selected item will be highlighted in white.

7

Press the ENT button.
The unit will enter the AL2 Set Value screen.

65

5

Item

Component

1

2nd stage gas alarm set value

Sets the 2nd stage gas alarm set value.

2

Increment/decrement unit

Displays the increment/decrement unit.

Operation Menus

Description/function

Button Operation
Button/dial
ENT button

Operation
Press to change the increment/decrement unit. Each press of the
ENT button cycles through unit options (1, 5, 10, 100, 1000).
Press and hold to confirm the setting.

MENU/CANCEL button

Press to cancel the current operation and return to the Alarm Setting
screen.

jog dial

Turn to adjust the value.

89Turn the jog dial to set the value.
Press and hold the ENT button for confirmation.
To execute, select “OK”.
To return to the previous step, select “Cancel”.

10 Select “OK” and press the ENT button.
The 2nd stage gas alarm set value will be set.

11 The screen will return to the Alarm Setting screen.

66

5

Operation Menus

5.7 Information
Form the information menu, the setup details and alarm/fault event history can be viewed.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Information”.
The selected item will be highlighted in white.

3

Press the ENT button.
The unit will enter the Information screen.

Information Menu
Menu

Description

Configuration Data

Displays the setup details.

Event History

Displays the alarm/fault events.

67

5

5.7.1

Operation Menus

Configuration Data
The setup details can be viewed from this menu.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Information”.
The selected item will be highlighted in white.

3

Press the ENT button.
The unit will enter the Information screen.

4

Select “Configuration Data”.
The selected item will be highlighted in white.

5

Press the ENT button.
The unit will enter the Device Set Data (configuration data) screen.

Configuration Data
Seq.

Item

Description/function

1

Serial No.

Displays the product’s serial number.

2

Mfg. Data (dd/mm/yy)

Displays the product’s manufacturing date.

3

Fullscale Value

Displays the full scale value of the product.

4

AL1 Set Value

Displays the 1st stage gas alarm set value of the product.

5

AL2 Set Value

Displays the 2nd stage gas alarm set value of the product.

6

Voice Message

Displays the on/off status of voice message.

7

Alarm volume

Displays the volume level of voice message and alarm sound.

8

1st Language

Displays the 1st language.

9

2nd Language

Displays the 2nd language.

10

Main Software Ver.

Displays the software version of the main board.

11

Sub Software A Ver.

Displays the software version of the sub-board A.

12

Sub Software R Ver.

Displays the software version of the sub-board R.

13

Sub Software B Ver.

14Sound Software Ver.

Displays software version of the sub-board B.
*Displays only for backup power type unit. “B” stands for battery.
Displays the software version of the audio data.

68

5

Operation Menus

5.7.2

Event History
The alarm or fault events of this product can be reviewed from this menu.
Up to 30 events can be viewed.
Operation Procedure

1

Deactivate the safety lock.
The Main Menu will be displayed.

2

Select “Information”.
The selected item will be highlighted in white.

3

Press the ENT button.
The unit will enter the Information screen.

4

Select “Event History”.
The selected item will be highlighted in white.

5

Press the ENT button.
The unit will enter the Event History screen.

Event

Description

Text color while event isgoing on.

Text color when event has
been cleared.

AL1

1st stage gas alarm

Amber

White

AL2

2nd stage gas alarm

Red

White

E - XX

Error (E-1 to E-42)

Blue

White

69

6

Maintenance

6 MaintenanceThis chapter explains the routine check, periodical inspection and part replacement procedure.

6.1 Routine Check and Periodical Inspection
Routine checks are carried out by the user, while periodical inspections are performed by New
Cosmos or its authorized representative.

Periodical inspection

Routine check

Action by

Frequency

Check item

Daily

Visual check

Monthly

Circuit check

Supervisor

Servicepersonnel

6 monthsorYearlySensor unit
calibration

Procedure Check that the green POWER LED is lit
and the unit operates.
 Check the display (gas concentration bar
graph, icons, measurement unit etc.).
 Check the unit for corrosion.
 Check mounting screws for corrosion.
Replace any worn or damaged parts.
 Check the alarm operation using the testmode.
 Check the battery life expectancy by thebattery voltage test.
 Contact New Cosmos or its authorized
representative for inspection.

Backup power
supply unit check

Important Notice for Periodical Inspection
In order to ensure the reliability of the gas detection and alarm system, it is vital to perform periodic
maintenance and inspections. Further, it is necessary to perform inspections and calibrations byusing actual gas (combustible or poisonous gas). It is highly recommended that a maintenancecontract with a local New Cosmos representative be made for the performance of periodical
inspections.
Installation, inspection, maintenance, calibration and proof testing shall only be performed bytrained personnel.

NOTICE While in the test mode, the external relay contacts and analog output are active. (The external
relay contacts are not active while in the maintenance mode.) If the external relay contact
outputs are used to interlock external devices, release the interlocks, as needed, before
checking the alarm operation using the test mode.


Notify those concerned before starting the gas alarm inspection.

70

6

Maintenance

6.1.1

Fuse Replacement

 Set the power switch to the off position before fuse replacement. Fuse replacementwith the power on may cause injury or device failure.

 Use the specified fuse.

1

Turn and loosen the knurled screw of the cover counterclockwise. Open the cover.

Hold the cover with your hand while opening/closing it. Flinging the cover may cause
injury or product damage such as a broken LCD.
Knurled screw

2

Set the power switch to the off position.

Power switch

3

While turning the fuse holder counterclockwise, pull and detach it from the unit. Pull andremove the fuse from the fuse holder.

Fuse holder

45

Replace the fuse with a new one.
Reinstall the fuse holder by taking the reverse order 1 to 3.

71

6

6.1.2

MaintenanceBattery Replacement
The battery life is about two years from the month of manufacture.

Use the specified batteries.
Set the power switch to the off position before battery replacement.
Observe the following precautions for safe use of batteries.
Incorrect use of batteries may cause them to leak, heat, ignite or explode.
 Do not charge used batteries.
 Do not short-circuit batteries.
 Do not disassemble, deform or modify batteries.
 Do not heat or throw batteries into a fire.

 Do not expose/soak batteries to/in freshwater or seawater.

 Battery replacement should be performed by service personnel, neither operator nor
supervisor.
 Replace both batteries at the same time.

 Ensure that the harnesses are not caught in by the battery lid when installing it.

1

Turn and loosen the knurled screw of the cover counterclockwise. Open the cover.

Hold the cover with your hand while opening/closing it. Flinging the cover may cause
injury or product damage such as a broken LCD.
Knurled screw

72

6

Maintenance2
3

Set the backup power switch to the off position.
Set the power switch to the off position.

Backup power switch

Power switch

4

Remove the screw from the battery case. Remove the battery lid.

Battery lid

5

Pull the two batteries. Disconnect the two battery connectors from the connectors on theunit. Remove the batteries from the unit.

73

6

6

Insert two new batteries into the unit. Connect the two connectors.

7

Push and completely insert the batteries.

Maintenance

8 Attach the battery lid to the unit.
9 Set the backup power switch to the on position.
10 Set the power switch to the on position.
6.1.3

AC-DC Power Supply Unit Replacement
The service life of the AC-DC power supply unit is five years from the month of manufacture.

Do not replace the AC-DC power supply unit in a place where combustible gas or
ignitable material is present.

Set the power switch to the off position before AC-DC power supply unit replacement.
Use the specified AC-DC power supply unit.

74

6

MaintenanceBattery replacement should be performed by service personnel, neither operator nor
supervisor.

1

Turn and loosen the knurled screw of the cover counterclockwise. Open the cover.

Hold the cover with your hand while opening/closing it. Flinging the cover may cause
injury or product damage such as a broken LCD.
Knurled screw

2

Set the power switch to the off position.

Power switch

75

6

3

Maintenance

Loosen the two screws. Slide the switching cover up.

Switching cover
Screw (2 places)

4

Disconnect the two connectors from the AC-DC power supply unit. Detach the switching
cover from the unit.

Connector (2 places)

5

Remove the two screws that attach the AC-DC power supply unit to the cover.
Replace the AC-DC power supply unit with a new one.
Ensure that the new AC-DC power supply unit is placed in the correct orientation.
2-pin connector

Screw (2 places)
5-pin connector

AC-DC power supply unit

6

Reinstall the AC-DC power supply unit by taking the reverse order 1 to 4.

76

7

Error Codes and Solutions

7 Error Codes and Solutions
This product has a self-diagnosis function, and if a problem occurs withthe device, the corresponding error code will be displayed to alert theuser along with a beeping sound or a voice message.
If a code other than the ones listed is displayed or if the problem
persists after performing the corresponding solution, please contact
New Cosmos or its authorized representative.

Error
code

Fault
LED

Fault
contact

E-6

On

Activated

E-7

On

Activated

E-8

On

Activated

E-9

On

Activated

E-10

On

Activated

E-11

On

Activated

Off

Not
activated

E-17

E-18

E-19

E-20

NOTE

Off

Off

Off

Error Codes and Solutions
AnalogProblemPossible cause
outputGas detector Broken wire of 0.6mA
broken wireline ABroken wire ofGas detector line B 0.6mA
short-circuit
Line A and line C
short-circuited
Gas detector
Broken wire of 0.6mA
4-20mA input
line D
broken wire
Gas detector
Broken wire for 0.6mA
1-5mA input
detector signal
broken wire
Broken wire of
Pyrolyzer
 0.6mA
detector’s
broken wire
pyrolyzer line
 0.6mA
Gas
concentration

value
Gas

Not
activatedconcentration

Not
activatedconcentration

Not
activated

value
Gas
value
Gas
concentration

value

Low flow rate

Flow rate is low
at gas detector.

Zero adj.
lower limit
error

Incorrect gas
concentration(calibration gas)
was applied.
Incorrect gas
concentration(calibration gas)
was applied.
Gas is present in
the vicinity of thegas detector.

Zero adj.
upper limit
error

Gas is present in
the vicinity of thegas detector.

Span adj.
lower limit
error
Span adj.
upper limit
error

Solution

Check the wiringand rewire.
(Refer to NV-120
series instruction
manual for
installation)

Check the gas
detector for flowrate.
Check that gas
type andconcentration ofcalibration gas arecorrect. Performspan adjustment.
Check that there is
no gas around thegas detector.
Perform zeroadjustment while
the detector is inclean air.

There are some errors where the corresponding error code and current gas
concentration are alternately displayed on screen. In case of error codes where the
FAULT LED is lit solid (e.g., E-11), only the corresponding error code is displayed.

77

8

Troubleshooting

8 Troubleshooting
Before requesting repair, please refer to the table below. If the product does not return to normal
operation after performing the corresponding steps in the table or if your issue is not found in thetable, consult New Cosmos or its authorized representative.
If the product goes into any unintended mode during adjustment or setting, cease using the productand consult with your supervisor.
Problem
Setting power switch toon position does notturn on green POWER
LED.
Setting power switch toon position does notturn on LCD.
Red MAINT LED is lit or
flashes.

Probable cause
Incorrect or loose
wiring.

Blown fuse.

Contact us for repair.

Product is inmaintenancemode.
Product is inmaintenancemode.
Incorrect wiring.

No contact output.
Gas alarm set
value set in thegas detector andthe one set in the
product do notmatch.
Product is inwarm-up cycle.

Cannot operate.

Safety lock is
active.

Action by

Supervisor

Replace the fuse with a newone. (6.1.1 Fuse Replacement)

Poor internal
connection.

Cannot make or adjust
setting.

Steps
Check and rewire.
(5.3 Wiring of Instruction
Manual for Installation)

Set the product togas-monitoring mode.
(5.2 Maintenance Mode)
Set the product togas-monitoring mode.
(5.2 Maintenance Mode)
Check and rewire.
(5.3 Wiring of Instruction
Manual for installation)

Check the gas alarm set
values. (5.6.2 Alarm Setting)Operate the product after the
warm-up cycle is completed.
(4.2.1 Power-up)
Deactivate the lock.
(5.1.5 Deactivate Safety Lock)

78

Supervisor

Supervisor

Supervisor

Supervisor

Supervisor

Servicepersonnel
Operator

9Specifications

9 Specifications
Product
Model
Detection
principle
Target gas
Detection
range
Power
voltagePower
consumption*2

External
outputs

Display
Statusindicator
Gas alarm
Fault alarmindication
Gas alarm
clearance
methodAlarm set
value
Alarm
accuracy
ResponsetimeCompliance
Color
Mass
Dimensions
Operatingtemperature

Single-point gas alarm system
NV-120Mx(4-20mA
input)
As perconnected
gas detector

NV-120Cv

NV-120Ci

Catalytic

NV-120Hi

NV-120Dx

NV-120Sx

Hotwire semiconductor

Electroche
mical

Galvanic
cell

Toxic gas

OxygenNV-120Hv

Combustible gas

As per connected gas detector
AC type: 100 to 240 VAC±10% or DC type: 24 VDC (18 to 26.4 VDC) *1
AC typeDC typeStandard
Max.
StandardMax.
Non-backup power type
2.0 VA
3.4 VA
2.0 W
3.4 W
Backup power type
2.1 VA
4.7 VA・Power output: 24 VDC ± 10% Max.0.3 A
・Signal output: 4-20 mA analog or 1-5 V *1
In the event of failure:  0.6 mA (for 4-20 mA type) and 0.25 V (for 1-5 V type)・1st stage gas alarm contact: Dry, N.O. or N.C.*1
Max. load: 250 VAC 2 A, 30 VDC 2 A (resistive load)・2nd stage gas alarm contact : Dry, N.O. or N.C.*1
Max. load: 250 VAC 2 A, 30 VDC 2 A (resistive load)
・Fault contact: Dry, N.O. or N.C.*1
Max. load: 250 VAC 2A, 30 VDC 2 A (resistive load)
・Audio alarm contact: Dry, N.O.
Max. load: 250 VAC 2A, 30 VDC 2 A (resistive load)
Color LCD with backlight
Green POWER LED, red ALARM LED (1st stage gas alarm: flashes and 2nd stage gas
alarm: flashes rapidly) and amber FAULT LED
・1st stage gas alarm: ALARM LED flashes red + LCD turns orange + beeping + voicemessage “Gas alarm”
・2nd stage gas alarm: ALARM LED rapidly flashes red + LCD turns red + fast beeping +voice message “Gas alarm”
FAULT LED lit amber + error code on display + fast beeping + voice message*3
Manual-resetting or auto-resetting *1
As per delivery specifications
As per connected gas detector
As per connected gas detector
EMC directive ( 2014/30/EU/SI 2016 No.1091 ) *4 and RoHS directive( 2011/65/EU+(EU)2015/863/SI 2012 No.3032 ) *5
Case and cover: DIC546 1/2 Backup battery unit: Munsell 10Y8.5/1
Non-backup power type: Approx. 750g
Backup power type: Approx. 2.2kg
Non-backup power type: W113mm×D77mm×H219mm
Backup power type: W113mm×D115mm×H234mm
Non-backup power type: –10 to 50C
Backup power type: 0 to 40C No rapid temperature change.

799Operatinghumidity
Mounting
methodIngress
protection

0 to 90%RH

Specifications

No condensation.

Wall-mounting or panel-mounting
IP2X when installed
Without intermittent
gas-monitoring mode

In the event of a power outage, the unit will continue continuous
gas-monitoring for another 120 minutes or more.
In the event of a power outage, the unit will continue continuous
Backupgas-monitoring for another 120 minutes, followed by intermittent
power type
With intermittent
monitoring (10 seconds each at 15-minute intervals). The*1, 6 and 7
gas-monitoring modeintermittent monitoring will last for max. 7 days when connected
to diffusion type gas detector and max. 2 days when connected
to extractive type.
*1. Must be specified at the time of ordering.
*2. Consumption power of the connected gas detector is excluded.
*3. Voice message changes depending on the nature of the fault.
*4. CE marking specification applies to NV-120Mx which uses 24 VDC power. Refer to the “EU Declarationof Conformity” (separate document) for information on the CE marking unit.
*5. None of the hazardous substances restricted by the RoHS directive is used in this product.
*6. Backup power type units are all AC type units. Only NV-120Ci and NV-120Cv models have intermittent
gas-monitoring mode.
*7. Gas alarm accuracy is compromised during the intermittent gas-monitoring mode, since the sensor
output becomes unstable during this mode, as a result, a gas alarm may be activated even though theconcentration does not reach the gas alarm set value.
*Only New Cosmos-manufactured gas detector can be connected to this product.
*Specifications above may be subject to change without notice.
*N.O.: Normally open.
*N.C.: Normally closed.

80

10 Warranty

10 Warranty
The warranty period is one (1) year from the date of purchase.
You are entitled to the limited warranty, if the product malfunctions due to a manufacturing defectduring normal use in accordance with the instruction manual, specifications and labels.
Warranty Scope
If the product fails or is found to be damaged due to a manufacturing defect during the warranty
period, and used in accordance with the instruction manual and specifications, we will provide a freereplacement and repair service. This warranty covers the New Cosmos product/parts only and notthird-party product/parts.
Warranty Exclusions
The following will be repaired at the cost of customer even during the warranty period.
(1) Failures and damages incurred by incorrect use, deliberate acts or negligence of the user.
(2) Failures and damages caused by disaster, earthquake, storm and flood, lightning, extreme
climate, abnormal power supply voltage, excessive electromagnetic interferences, or other actsof God.
(3) Failures and damages resulting from repair and/or modification by non-New Cosmos certified
technicians.
(4) Consumables and failures and damages resulting from improper consumable replacement.
(5) Other failures and damages not attributable to the manufacturer.

81

11

Glossary

11 Glossary
Term
Alarm unit

Definition
Device that indicates the gas concentration and activates an alarm according to
the signals received from a connected gas detector.

Backup power supply
unit

Battery unit that provides emergency power to the product when the input
power source or main power fails.

Backup power type andnon-backup power type

There are NV-120 units with and without backup batteries attached. They arecalled “Backup power type” and “non-backup power type” respectively.

Gas detector (or gas
detector head)

Device used to detect the presence of a target gas and to give its concentrationin the form of an electrical signal.

Diffusion typeGas sampling method using convective diffusion while placing a gas detector at
a detection point.

Extractive typeGas sampling method using a pump.

Target gas

Specific gas to be detected, concentration displayed, and used to trigger
alarms.

Alarm set value

A gas concentration value that is set on a gas detector for alarm activation.

Detection range

A range of target gas concentrations that can be displayed and trigger alarms.

Alarm accuracy

Difference between the alarm set value and the detected gas concentration that
activates the alarms. It may also be expressed as a % with respect to the alarm
set value.

Operating temperature/humidity range

Ambient temperature/humidity range in which the gas detection and alarmsystem can operate normally.

Maintenance andinspection

Tasks performed to ensure that equipment operates normally and correctly.

Hazardous area

An area in which an explosive atmosphere is present, or may be expected to bepresent, in quantities such as to require special precautions for theconstruction, installation and use of electrical apparatus.

Non-hazardous area

An area in which an explosive atmosphere is not expected to be present inquantities such as to require special precautions for the construction,
installation and use of electrical apparatus.

Explosive atmosphere

Mixture of air and flammable substances in the form of dust or vapor which arewithin their explosive limits.

LEL (or LFL)

Lower Explosive Limit (or Lower Flammable Level). Lowest concentration(percentage) of a gas or vapor in air capable of producing a flash fire, or
explosion in the presence of an ignition source like arc, flame or heat.

%LEL

Concentrations of combustible gas given in terms of percent of the lower
explosion limit.

vol%Gas concentrations given in terms of percent of cubic volume.

ppm

Gas concentrations given in terms of millionth part of cubic volume.

Zero suppression(or 20.9 suppression foroxygen detection)

For indicator units with a zero suppression (or 20.9 suppression) function, thebar graph display will continue to indicate “0” (or 20.9 vol%) until the target gas
concentration detected by the detector exceeds the pre-set value. The pre-set
value is given in the delivery specifications.

Clean air or normal air

Standard atmosphere which contains 20.9 to 21.0% oxygen in dry condition or
atmosphere without target gas or interference gases.

82

Document No.

Revision History
Date

Revision

GAE-154-00
December 2019
0 (Initial issue)
GAE-154-01
December 2020
1
GAE-154-02
October 2021
2
GAE-154-03
September 2022
3
Additional copies of this instruction manual may be purchased.
Contact New Cosmos or its authorized representative to order.

Authorized representative:

Manufacturer:
NEW COSMOS ELECTRIC CO., LTD.
2-5-4 Mitsuya-naka, Yodogawa-ku,
Osaka 532-0036, Japan
http://www.new-cosmos.co.jp