V3 Series
Indicator Unit
Instruction Manual・ Keep this manual for easy reference.
・ Carefully read this manual prior to use.
・ This manual describes the standard model. If your unit has end-user-specificoptions, this manual will be superseded by your delivery specifications.

Instruction Manual No.
GAE-041-03
September 2022

Table of Contents
1. Introduction ............................................................................................1
2. Precautions ............................................................................................2
3. Package Contents ..................................................................................3
4. System Configurations ...........................................................................4
5. Unit Dimensions and Components.........................................................96. Installation ............................................................................................ 11
7. Wiring and Connections .......................................................................13
7-1. Connection with Gas Detectors ......................................................14
7-2. Connection with Alarm Unit ............................................................18
7-3. Connecting Power Source .............................................................19
7-4. Connection with External Devices or Annunciators ........................19
7-5. Connection for Analog Output ........................................................20
7-6. Connecting Cabinet Panel Reset Switch........................................20
8. Operation .............................................................................................228-1. Start-up ...........................................................................................228-2. Maintenance Mode .........................................................................23
8-3. Adjustment Procedures ..................................................................24
8-4. Gas Alarm ......................................................................................41
8-5. Cancel a Gas Alarm .......................................................................43
8-6. Trouble Alarm .................................................................................45
9. Maintenance ........................................................................................47
10. Troubleshooting .................................................................................48
11. Specifications .....................................................................................49
12. Warranty.............................................................................................50
13. Life Expectancy ..................................................................................50
14. Glossary .............................................................................................51
15. Sensor Stabilization Warm-up Duration .............................................52

1. Introduction
Thank you for purchasing the New Cosmos V3 series indicator unit.
Prior to use, please read this instruction manual to ensure safe and reliable operation and toprevent accidents.
The indicator unit is used in connection with a gas detector which can detect a variety of gases
including combustible gases. Install the gas detector at a location where detection of the target gas
is necessary. Install the indicator unit at a location convenient for monitoring gas concentrations.
Detector-indicator unit combinations can be used in conjunction with one alarm unit (Model VAS or
VAL) to form a gas detection and alarm system.
The indicator unit displays the gas concentration detected by the corresponding gas detector on its
bar graph display. If the gas detector detects a leak of the target gas that is higher than a preset
limit or, in the case of a reduction in oxygen concentration to a level below a preset limit, the alarm
unit produces audio-visual alarms.
Periodic maintenance and inspection are essential to maintain the reliability of the product.
Perform periodic maintenance and inspection in accordance with the instructions given in thismanual.
There are various types of V3 series indicator units. They are divided according to the gas detector
types they are used with, and these types are divided into the following five groups.

Group 1

Group 2

Group 3

Group 4

Group 5

Type Hv

Type O

Type MType HiType Zn

Type Cv

Type D(CE marking*)

Type Ci

Type Tv

Type Ti

For type selection, please contact New Cosmos or its authorized representative.
CE marking specification is specified upon placing an order.
The wiring, adjustments and other unit-related items can vary from group to group. In such cases,
this manual clearly specifies the name of the applicable group, and shows that the information or
instruction given applies to that group only.
*The following combinations can comply with CE marking. Refer to the separate “EU Declarationof Conformity” for more information.
- Type M indicator unit solo
- Type M indicator unit with VAS alarm unit
- Type M indicator unit with RST-01 reset relay terminal- Type M indicator unit with VAS alarm unit and RST-01 reset relay terminal
Note: Type M indicator is paired with a V-SC-4B or V-SC-4B(S) metal housing and VAS
alarm unit is paired with a V-SC-A or V-SC-A(S) metal housing.

-1-Symbols Used in this ManualThis manual uses Danger, Warning, Caution and Note symbols to draw attention to procedures,materials, methods, and processes, which require particular attention.

DANGER

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

WARNING

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

CAUTION

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

NOTE

Provides information on product handling.

2. Precautions• To ensure safe operation, follow the precautions below.
• Only use this product in accordance with applicable laws and regulations.

WARNING

Ground the detector to prevent electric shocks.
In the event of a gas leak alarm, follow safety procedures in accordance with yourcompany's regulations.
This product is not explosion-proof and should not be installed in a hazardous area.

CAUTION

Wiring and installation should only be performed by a qualified electrician withknowledge of wiring/installation procedures.
Do not disassemble, modify or alter the structure of this unit or its electrical circuits.
Doing so may compromise the performance of the product.
This product is not drip-proof and should be kept away from splashing water.
Only use this product in accordance with applicable laws and regulations.

-2-3. Package Contents
The following items are included in a standard package. If any items are missing or damaged,please contact New Cosmos or its authorized representative for replacement.

Standard Contents
Item

Qty.

Indicator unit

1

Replacement fuse, 1.0 A

1Instruction manual (this document)

1 *1*1. One manual is provided per order and not per indicator unit.
Metal Housing (Optional)
Item

Qty.

Metal housing

1

Mounting bracket with two tension screws

2

Accessories for Metal Housing (Optional)
Item

Qty.

As per system
configurationAs
per system
Clamp with two fixing screws*2
configurationAs
per system
Flat cable assembly *3
configuration*4
Reset relay terminal, RST-01
As per systemwith ferrite coreconfiguration*2. Necessary when multiple metal housings are installed side byside.
*3. Dedicated cable for connection between indicator units, alarm
unit, and/or reset relay terminal.
*4. Necessary for clearing a gas alarm without using an alarm unit.
Partition board *2-3-

4. System Configurations(1) Typical System Configuration for Group 1 (Type: Hv/Cv/Tv)

Power
SourceNoise Filter

Flat Cable Assembly (FAS)

VAS
Alarm Unit

Metal
Housing

V3
Indicator
Unit

V3
Indicator
Unit

Type:
Hv/Cv/Tv

Type:
Hv/Cv/Tv

E
Control Devices
Recorders

E

E

Individual Alarm Contacts
Analog Outputs

FG

Terminal Blocks on Cabinet Panel
Cabinet PanelE

FG: Frame ground
E: Earthed* Use 6-core shielded cable if using low
flow rate signal.

5-coreShielded Cable*

3-coreShielded Cable

OUT
P
E

FG
GAS IN
FG

Figure 1. Typical System Configuration for Group 1

NOTE

A VAS or V3 unit and a metal housing are always paired.

-4-

(2) Typical System Configuration for Group 2 (Type: O/D)

Power
SourceNoise Filter

Flat Cable Assembly (FAS)

VAS
Alarm Unit

Metal
Housing

E
Control Devices
Recorders

V3
Indicator
Unit
Type: O/D

V3
Indicator
Unit
Type: O/D

V3
Indicator
Unit
Type: O/D

E

E

FG

Individual Alarm Contacts

Analog Outputs
Zener BarrierE

Terminal Blocks on Cabinet Panel

Cabinet Panel

FG: Frame ground
E: Earthed* Use 5-core shielded cable
if using low flow rate signal.

E
2-coreShielded Cable

4-coreShielded Cable*

P
FG

E

GAS IN

Figure 2. Typical System Configuration for Group 2

A VAS or V3 unit and a metal housing are always paired.

-5-

Single Class-A
Earthed

2-coreShielded Cable

OUT

FG

NOTE

FG

FG

(3) Typical System Configuration for Group 3 (Type: M)

Noise Filter

Power Source

Flat Cable Assembly (FAS)

VAS
Alarm Unit

Metal
Housing

V3
Indicator Unit

V3
Indicator Unit

Type: M

Type: M

E

E

E

Terminal Blocks on Cabinet Panel

FG

Individual Alarm Contacts

Control Devices

Analog Outputs

RecordersCabinet PanelE

FG: Frame ground
E: Earthed

3-core Shielded Cable

4-core Shielded CableP
E

FG
GAS IN
FG

Figure 3. Typical System Configuration for Group 3

NOTE

A VAS or V3 unit and a metal housing are always paired.

-6-

OUT

(4) Typical System Configuration for Group 4 (Type: Hi/Ci/Ti) or Group 5 (Type: Zn)

Noise Filter

Power Source

Flat Cable Assembly (FAS)

VAS
Alarm Unit

Metal
Housing

E
Control Devices
Recorders

V3
Indicator
Unit
Type: Hi/Ci/
Ti/Zn

V3
Indicator
Unit
Type: Hi/Ci/
Ti/Zn
E

E

Individual Alarm Contacts
Analog Outputs

Cabinet Panel

FG: Frame ground
E: Earthed

FG

Terminal Blocks on Cabinet PanelE
4-core Shielded Cable

6-core Shielded Cable

OUT
P
E

FG
GAS IN
FG

Figure 4. Typical System Configuration for Group 4/5

NOTE

A VAS or V3 unit and a metal housing are always paired.

-7-

(5) Typical System Configuration for V-NET (Groups 1-5)
Power
SourceNoise Filter

Flat Cable Assembly (FAS)

RST-01SD

Metal Housing

Single wire
Terminal No.3

RS-232C

VS-1
Comm.
Control
Unit

VS-3
Network
Extention
Unit

V3

VAS
Alarm
Unit

Indicator

V3
Unit

Unit

E

E

E

Indicator

Modem
E

E

3-core Shielded Cable(100m or less)3-core Shielded Cable(1km or less)Power
SourceModem

Central Control(CPU)

Noise Filter

Flat Cable Assembly (FAS)

Gas Vision
VS-2
Comm.
Relay
Unit

*E: Earthed

E

V3

V3

VAS
Alarm
Unit

Indicator

Unit

Unit

E

E

E

Indicator

Figure 5. Typical System Configuration for V-NET
NOTE

VS-1: Communication control unit for a V-NET system. It sends RS-232C signals and can receive
signals directly from the indicator units.
VS-2: Communication relay unit for relaying signals. It plays a supplementary role for VS-1. VS-2
is installed with a group of indicator units which are installed separately from a group of
indicator units installed with VS-1. VS-2 and VS-1 are interconnected by a digitalcommunication cable. The distance between VS-1 and VS-2 shall be less than 100m. If the
distance is longer than 100m, VS-3 is required to be installed between VS-1 and VS-2.
VS-3: Network extention unit is used for extending the communication relay and plays asupplementary role for VS-1. The VS-2 and VS-3 are interconnected by a digitalcommunication cable. The distance between VS-2 and VS-3 shall be less than 1 km.
- Refer to 7-1 “Connection with Gas Detectors” for connecting an indicator unit and a gas detector.
- A maximum of 254 indicator units can be connected to VS-1 and VS-2 in a V-NET system.
- A metal housing and a VAS, V3, VS-1, VS-2, or VS-3 unit are paired.

-8-

5. Unit Dimensions and Components
⑦ ⑧

④

⑫

①

③

②

⑤

⑥

⑩

⑨

⑪ ⑬ ⑭

(Dimensions are in mm)

Figure 6. Exterior Appearance of Indicator Unit (with Metal Housing)

Item

Component

Description/Function

1
2
3
4
5

Mode LEDs 1 to 5 (5 LEDs)
Side cover
Front coverTag number plate
Panel lock knob

6

Setting wheel

7
8
9
10
11
12

Connector terminal(3 places)
Fuse
Metal housing
Connector A
Connector B
Power switch

13
14

Terminal block
Earth terminal

When a mode is selected, the corresponding LED is lit
Remove this cover to replace the external EEPROM
Open this cover to access the operation buttons
Used to fill in the name or number of the detection location
Push in the knob to install the indicator unit to the metal
housing/cabinet panel, and pull the knob to remove theindicator unit from the metal housing/cabinet panel
Scroll the wheel back/forward (UP/DOWN) to select themode or increase/decrease the parameter, or press andhold the wheel up to confirm a selection (ENTER)
Used to check the heater current and sensor input (4-20mA
or 1-5mA)
Dia.5.2 x 20L, 1.0A
Case dedicated to house a single indicator unit
Used to internally connect with a metal housing
Used to connect with an alarm unit
Toggle switch located on the rear of the metal housing
Turns on/off the indicator unit
8-way double row terminal block used for external wiring
Spacer for grounding the frame

-9-

②
③
①

④
⑤
⑥
⑦

⑧

⑪

⑨
⑩

⑫

Figure 7. Operation Panel of Indicator Unit

Item

Component

Description/Function

1
2
3

Gas concentration bar graphdisplay
Green POWER LED
Amber TROUBLE LED

4

Red ALARM2 LED

5

Red ALARM1 LED

6
7

Red MNT LED
Red TEST LED

8

ADJ button

9

TEST button (recessed)

10

MNT button

Lit when the indicator unit is on
Flashes when a device failure (of a connected gas
detector or indicator unit itself) is detectedFlashes when the gas concentration exceeds the 2ndstage alarm set value
Flashes when the gas concentration exceeds the 1ststage alarm set value
Lit or flashing when the maintenance mode is on
Flashes when the test mode is on
Plays a role as an indicator for zero positioning when
performing a zero adjustment on Group 4 or 5, Refer to“(3-B) Coarse Zero Adjustment for Groups 4 and 5” onpage 32
Press to perform a one-touch zero adjustment
Refer to “(2) One-touch Zero Adjustment” on page 31
Press to test the gas alarm function.
Use a rounded pin for pressing this button
Press to enter the maintenance mode

11

HIGH button

Increases the simulated gas concentration for test mode

12

LOW button

Decreases the simulated gas concentration for test mode

Displays the gas concentration and alarm set values- 10 -

6. Installation
WARNINGThis product is not explosion-proof and should not be installed in a hazardous area.

CAUTIONInstall the product in plain view where it can be constantly monitored by an attendant,
and convenient enough for taking emergency procedures or giving instructions in theevent of an alarm.
Install the product at a location free of vibration, electrical interference, and high humidity.
Do not install the product in the vicinity of devices emitting radio frequencies.

(1) When you prepare a panel for the mounting of metal housings with indicator/alarm units by
yourself, take the following steps:
Prepare a panel (1.6 to 6 mm thick) and cut a square cutout in it. Refer to the drawing below for
the cutout size.
38.5 × n + d–0
137 +1n: Number of alarm/indicator
units to be mounted.

60 or more*d: Allowable tolerance.
n = 1 to 10

d=3

n = 11 to 15

d=4

n = 16 to 20

d=5

n = 21 to 25

d=6

n = 26 to 30

d=7(Measurements are in mm)* For two-stage installation, keep 60mm or more space between the two square cutouts.

Panel cutout size
(2) Loosely install a clamp on each end of the square cutout with two fixing screws.
Fixing screws (two per clamp)
Clamp

Panel

Top View- 11 -

(3) Insert a metal housing from the front of the panel, through the square cutout. When installing
multiple metal housings, insert a partition board between each pair of metal housings.
Metal housings
Metal housing
Partition

BoardsPanel

Installation of a single metal housing

Panel

Installation of multiple metal housings

Top View

Top View(4) Install the two mounting brackets for each metal housing (top and bottom). Secure the metal
housing to the panel by tightening the tension screws with a flat-bladed screwdriver as shownin the drawing below.
When installing multiple metal housings, center the metal housing in the cutout, and tighten thetension screws until there is no gap between the adjacent metal housing and partition board.

Panel

Metal housing

Mounting Bracket with Tension Screw(2 places)

Side View(5) Adjust the position of the clamps and firmly tighten the fixing screws to the panel until there is
no gap between the metal housings and the clamps.

NOTE

Evenly and firmly tighten the fixing screws for mounting clamps and tension
screws for mouting brackets.

- 12 -

7. Wiring and Connections
On the back side of the metal housing there are an 8-way double row terminal block and a connector(Connector B). Use this terminal block to connect the indicator unit to a gas detector, power source, andexternal devices. Note that this terminal block is compact in size (M3-size round solderless terminals, outerdia. 6.4mm or less) and is therefore not suitable for direct external wiring. Do not directly connect external
wiring with this terminal. To accommodate external wiring, use a separate terminal block between. To
connect the indicator unit to an alarm unit, use a Connector B and an optional flat cable assembly.

１－ＡＴ

To alarm unit

２－Ｚ２
３－ＡＳ

Connector B

４－ＡＲ
５－ＢＺ

8-way double row
terminal block

６－Ｚ１
７－ＳＤ*
８－

Earth terminal

Connector B

V-SC-6/6(S) metal housing only
Terminal
No.

1
2

P (+)
N (–)

3
4
5

PA (+)PB (–)
A (F)

6

B

7

C

8

D

9
10
11

ZC2
ZA2
ZC1

12

ZA1

13

TC

14

TZ

15

G (+)

16

H (–)

-

E

V-SC-4B/V-SC-4B(S)metal housing
Input power
24 VDC

V-SC-1, V-SC-1(S), V-SC-6 or V-SC-6(S)metal housing
P (+)
Input power
24 VDCN (–)
PA (+)PB (–)A (F)Pump power output
24 VDC

Pump power output
24 VDCB

Gas detector

Gas detectorCD

2nd stage alarm
NO or NC*st

1 stage alarm
NO or NC*
Trouble alarm
NO or NC*

Contact
output100 VAC, 1A
24 VDC, 1A

ZA1
ZB1
TZ
G (+)

Analog output

H (–)

Earth terminal* As per the metal housing's specifications.

ZC
ZA2
ZB2

E

Common
2nd stage alarm
NO-C-NC contactst

1 stage alarm
NO-C-NC contact

Contact output
100 VAC, 1A
24 VDC, 1A

Trouble alarm
NO contact
Analog output
Earth terminal

NO: Normally open; NC: Normally closed; C: Common

Figure 8. Terminal Block and Connector Pin Assignment

NOTE

・ Pump power output terminals (Nos.3 and 4) are only used for connecting an
extractive-type gas detector with a built-in 24 VDC pump and NOT a 100 VAC pump.
・ Do not use the pump power output for any purpose other than supplying power to an
extractive-type gas detector.

- 13 -

7-1. Connection with Gas Detectors

CAUTION

Refer to the markings to ensure that the cables are correctly connected between a metal
housing (which houses an indicator unit) and a gas detector.
Keep the connection cables (power/signal lines to gas detectors/indicator units/alarmunit) away from other power lines.
When installing a gas detector at a hazardous location, use explosion-proof wiring. Referto the explosion-proof wiring insturctions of the gas detector’s instruction manual.

Figures 9 to 12 show the connections between metal housings and gas detectors. Ensure that the
number on the tag number plate of the indicator unit matches the number on the loop number labelof the gas detector before connecting.
Connect a power cable to the pump of an extractive-type gas detector (pump power 24 VDC) withterminals PA (+) and PB (-) (Terminal Nos.3 and 4).
Refer to the gas detector’s instruction manual for specific information on cable length.

NOTE(1) Typical Wiring Connection for Group 1 (Type: Hv/Cv/Tv) Indicator Units and Gas Detectors

３
４
５
６
７
８

Indicator Units

PA(+)
PB(-)
A
B
C
D Ｅ

PA(+)
PB(-)
A
B
C
D Ｅ

３
４
５
６
７
８

E
Cabinet Panel‘s
Terminal Blocks

Gas Detectors

B

B

C

C

D

E

PA

E

PA(+)
PB(-)
A
B
C
D
Ｅ

３
４
５
６
７
８

PB

B

C

D

E

Cabinet Panel

E

PA

PB

F

B

C

D

E

E

E

E

3-core Shielded Cable

5-core Shielded Cable

6-core Shielded CableDＥ

PA PB B
（＋）
（－）

C

PB

（＋）
（－）

Ｅ

FG

FG
Diffusion-type
Gas Detector

PA

D

Extractive-type Gas Detector(Pump Power: 24 VDC)

F

B

C

D
Ｅ

FG
Extractive-type Gas Detector
with Flow Sensor (Pump Power: 24 VDC)
FG: Frame groundFigure 9. Wiring Connection for Group 1 Indicator Units and Gas Detectors- 14 -

(2) Typical Wiring Connection for Group 2 (Type: O/D) Indicator Units and Gas Detectors

24 VDC （＋）
Power （－）
１
２
３
４
５
６
７
８

Indicator Units

P(+)
N(-)
PA(+)
PB(-)
A
B
C
D
Ｅ

P(+)
N(-)
PA(+)
PB(-)
A
B
C
D

１
２
３
４
５
６
７
８

P(+)
N(-)
PA(+)
PB(-)
A
B
C
D

１
２
３
４
５
６
７
８

* Refer to
NOTE below

Ｅ

Ｅ

E

I

FG

E

Cabinet Panel

Cabinet Panel‘s
Terminal Blocks

C

D

E

E

PA

PB

F

C

D

E

E

Zener
Barrier

11

12

E

C

D

E

2-core Shielded Cable

5-core Shielded Cable

2-core Shielded Cable

Single Class-A
E

Gas Detectors
C

D

PA

E
Ｅ

Ｅ

FG
Diffusion-type Gas Detector

PB

F

C

D

（＋） （－）

E

C

D

E
Ｅ

E

Ｅ

FG
Extractive-type Gas Detector(Pump Power: 24 VDC)

FG
Intrinsically Safe Explosion-proof
Diffusion-type Gas Detector“F” is used for a gas detector with a built-in flow sensor.
FG: Frame groundFigure 10. Wiring Connection for Group 2 Indicator Units and Gas Detectors

NOTE

Electrical leakage may damage the unit. When a zener barrier is used, add afuse (1 A, Type B, sold separately) at the location marked with “I” in Figure 10,
as needed.

- 15 -

(3) Typical Wiring Connection for Group 3 (Type: M) Indicator Units and Gas Detectors

３
４
５
６
７
８

Indicator Units

PA(+)
PB(-)
A
B
C
D Ｅ

PA(+)
PB(-)
A
B
C
D Ｅ

３
４
５
６
７
８

E

Cabinet PanelE

Cabinet Panel‘s
Terminal Blocks
P

N

G

E

P

N

G

F

E

E

E

3-core Shielded Cable

Gas Detectors

P

N

G

H

（＋）（－）（＋）（－）

P

E
Ｅ

4-core Shielded Cable

N

G

H

F

（＋）（－）（＋）（－）

FG
Diffusion-type Gas Detector

N

E
Ｅ

FG
Extractive-type Gas Detector“F” is used for a gas detector with a built-in flow sensor.
FG: Frame groundP-N: Gas detector power 24 VDC
G-H: Gas detector analog output (4-20mA)

Figure 11. Wiring Connection for Group 3 Indicator Units and Gas Detectors- 16 -

(4) Typical Wiring Connection for Group 4/5 (Type: Hi/Ci/Ti/Zn) Indicator Units and Gas Detectors

３
４
５
６
７
８

Indicator Units

PA(+)
PB(-)
A
B
C
D

PA(+)
PB(-)
A
B
C
D E

３
４
５
６
７
８

E

E
Cabinet Panel‘s
Terminal Blocks

A

B

C

D

E

E

PA

PB

A

B

C

D

E

E

E

6-core Shielded Cable

4-core Shielded Cable

Gas Detectors

A

B C

PA PB

D
E

A

（＋）
（－）

B

C

D
E

FG

FG
Diffusion-type Gas Detector

Cabinet Panel

Extractive-type Gas Detector(Pump Power: 24 VDC)
FG: Frame groundFigure 12. Wiring Connection for Group 4/5 Indicator Units and Gas Detectors- 17 -

7-2. Connection with Alarm Unit
Connect indicator units to an alarm unit by using optional flat cable assemblies.
The number of connectors needed on the flat cable assembly (FAS-1) is equal to the total numberof indicator units plus an alarm unit. Attach them to their corresponding connectors (Connectors B)
on the rear of the metal housings.
When indicator units are mounted in two stages, a flat cable assembly (FAS-2) with two flat cable
assembly connectors (FAS-3) is required to connect the top and bottom stages. In this case, thenumber of connectors needed on a flat cable assembly (FAS-1) is equal to the total number ofmetal housings plus one for each stage.

1st stage of indicator units

Connectors B
Rear ofalarm unit
Rear ofindicator units

Flat cable assembly (FAS-1) on 1st stage

Flat cable assembly

Flat cable assembly connector (2 places)
To flat cable assembly (FAS-1)
on 2nd stage.

Figure 13. Wiring Connection with Alarm Unit

- 18 -

7-3. Connecting Power Source
24 VDC power needs to be supplied between terminals P (+) and N (-) (Terminal Nos.1 and 2).
If 24 VDC is not available, use a VPW-type power source unit (sold separately) for use with a 100
VAC commercially available power source.

CAUTIONWhen multiple units are to be employed, the amp ratings and voltage drops should beconsidered before wiring.
Ensure that the polarities are correct.

7-4. Connection with External Devices or Annunciators
The terminal assignment changes according to the model of the metal housing. For example,
when using a metal housing, Model: V-SC-1 or V-SC-1(S), the terminals Nos. 9 to 13 (dryNO-C-NC contacts) are assigned to the 1st and 2nd stage alarms as shown in the drawing below.
The terminal No. 9 is a common terminal.

Indicator unit

CommonIndicator unit

Common

99

To 2nd stage NO input
type annunciator

1010
2nd stage

2nd stage

11

11

1st stage

To control
devices12

To NC input typeannunciator

1st stage

12
13

13

To 1st stage NO input
type annunciator

To NC input typeannunciator

Fuse

Control Power

Figure 14. Wiring Connection for Alarm Contact Output Terminals- 19 -

7-5. Connection for Analog Output
The 4-20mA analog signal corresponding to the detected gas concentration is output from themetal housing’s analog output terminals (Terminal Nos. 15 ad 16). The polarities (Nos. 15 and 16)
are + and – respectively.
A recorder or PLC can be connected to these analog output terminals, as necessary.
Indicator unit+
15

Analog output

To recorder, PLC, etc.

(4-20mA)
16–

Figure 15. Wiring Connection for Analog Output Terminals

7-6. Connecting Cabinet Panel Reset Switch
Both optional flat cable assembly (FAS-1) and reset relay terminal (RST-01) are required to relay
reset signals to the reset switch on the cabinet panel without using an alarm unit.
To install the reset relay terminal, remove the two screws from the rear of the metal housing on far
right. The number of connectors needed on the flat cable assembly (FAS-1) is equal to the numberof indicator units plus one. Attach the flat cable assembly between the connectors B on the rear of
the metal housings and the reset relay terminal.

NOTE・ For performing an external reset using the alarm unit, refer to the alarm unit’s
instruction manual.
・ For the CE marking specification, add a ferrite core (provided with RST-01) tothe cable by wrapping the cable around the ferrite core (one loop) and securing
the core to the cable with a tie wrap as shown in Figure 16.
・ When the reset relay terminal is added, only the following combinations comply
with the CE marking requrements.
- Indicator unit (Type M) with reset relay terminal (RST-01)- Indicator unit (Type M) with reset relay terminal (RST-01) and alarm unit (VAS)
・ Cable: No special requirments apply.

- 20 -

Connector B

Metal housing
on far right
Flat cable assembly(FAS-1)

Remove the two screws, then install the reset relay terminal
Reset relay terminal
Ferrite core
Tie wrap(RST-01)

1
2
3
4
5
6
7
8

Looped
cable

Ｎ

Clamp

- Ferrite core is needed for
CE marking- Should be installed within
10cm from RST-01
To reset switch
RESET
AS
AR
N

To power source terminal Na) Semi-lock type
BZ.STOPAS
AR
N
To power source terminal Nb) Full-lock typeFigure 16. Wiring Connection for Cabinet Panel Reset Switch- 21 -RESET

8. Operation
8-1. Start-up
Important
Start-up operation can be extremely dangerous because it uses actual gas (e.g.,combustible gas, toxic gas). It is highly recommended that New Cosmos or an authorized
representative should be contacted to perform the initial start-up. The accuracy of the checks
and adjustments made during start-up (e.g., zero/span adjustments, operation checks using
actual gas) is crucial to ensure the reliability of the gas detection and alarm system. Start-up
operation should only be performed by authorized personnel.

CAUTION

Before turning on the unit, refer to 7 “Wiring and Connections” to check that all thecomponents are connected correctly. Also check your delivery specifications, if your unit
has end-user-specific options.

After making sure that the power source voltage and the wiring are correct, take the following steps
to operate the indicator unit:(1) Power-on
Set the power switch to the on position. The green POWER
LED will start flashing and the warm-up cycle will start.

(2) Warm-up
Once the warm-up cycle is completed, the green flashing POWER LED will become steady.
Normal operation will then start. The time required for warm-up cycle differs depending on thesensor’s detection principle. Refer to 15. “Sensor Stabilization Warm-up Duration” for more
information.
NOTE

Before zero/span adjustment or gas sensitivity check (gas concentration
adjustment), fully stabilize the sensor by energizing the detector for a
recommended period of time given in Table 2 “Recommended Sensor
Stabilization Warm-up Duration” on page 52.

Once the warm-up cycle is completed, the indicator unit is ready for normal operation.
If further adjustment is necessary, refer to 8-2 “Maintenance Mode” and 8-3 “Adjustment
Procedures”.
- 22 -

8-2. Maintenance Mode
Maintenance mode is used to deactivate the alarm contact outputs of the indicator unit and thealarm notification of the alarm unit. Set the indicator unit to the maintenance mode when
performing adjustments, alarm operation check using the TEST button, or operation check using
actual gas.
This indicator unit has two types of maintenance modes: Maintenance Mode 1 and Maintenance
Mode 2. The differences between them are described in the table below:
Indicator Unit during Maintenance ModeGas alarm contacts
Trouble alarm contact
Analog output
Bar graph display

Maintenance Mode 1
Disabled
EnabledOutput corresponding to gas
concentration
Displays gas concentration

Maintenance Mode 2
Disabled
Disabled
Output set while in Mode 2-4(Page 36)
Displays gas concentration

Alarm Unit during Maintenance Mode
Red ALARM LED
Alarm audio
Amber TROUBLE LED

Maintenance Mode 1
Off
Beeps for three seconds in theevent of a gas alarm.
On during faults

Maintenance Mode 2
Off
Muted
Off during faults

How to enter/exit maintenance mode
1. Open the front cover.
2. Press the MNT button once to enter Maintenance Mode 1. Press the MNT button for about threeseconds to enter Maintenance Mode 2.

MNT LED flashes during Maintenance Mode 1,
and is steady during Maintenance Mode 2

3. To exit the maintenance mode, press and hold the MNT button until the red MNT LED turns off.

- 23 -

8-3. Adjustment Procedures
8-3-1. Flow Rate Adjustment
When an extractive-type gas detector is connected, make sure that the center of the sphere of thegas detector’s flow meter aligns with the red line. If not, adjust the flow with the gas detector. For
details on the adjustment, refer to the gas detector’s instruction manual.
8-3-2. Modes(1) Mode Lock Deactivation
Before starting a zero/span/other adjustment using Modes 1 to 5, deactivate the mode lock.
How to deactivate mode lock
1. Press the HIGH button (for at least three seconds).
2. Press the ADJ button.
3. Press the LOW button.
4. Press the HIGH button.
When the mode lock is deactivated, the steady green POWER LED will start flashing rapidly.

When mode lock is deactivated,
steady POWER LED will start
flashing rapidly

NOTE

The mode lock cannot be deactivated while in the test mode (page 37). Exit
the test mode before deactivating the mode lock.

CAUTIONEntering Modes 1 to 5 resets an alarm. Do not enter any of these modes while an
alarm is active (e.g., alarm set off by gas leak). Before starting an inspection or
adjustment, make sure that the indicator unit has returned to normal gas monitoring
operation (no active alarm), then deactivate the mode lock.
After changing any set value while in Modes 1 to 5, press and hold the setting wheel
up to save the change. Unsaved value changes will not be reflected in the product.

- 24 -

(2) Mode Selection- Deactivating the mode lock enables mode selection. Take the steps below to select a mode.
- Pull and remove the indicator unit from the metal housing and locate the five LEDs (Nos.1 to 5)
on the left side of the indicator unit. Each LED is numbered to represent its corresponding
mode (1 to 5). Only one LED is lit at a time.
How to select the mode
1. Select the desired mode by scrolling the setting wheel. The lit LED moves in relation to how thesetting wheel is scrolled backward/forward.
Light in the LED indicator moves inrelation to the wheel

Scroll the setting wheel
backward or forward

2. Press and hold the setting wheel up to confirm
the mode selection.
Press the setting wheel up

3. The five LEDs on the front (TROUBLE, ALARM2, ALARM1, MNT and TEST) represent theircorresponding sub-modes (x-1 to x-5), and turn on when selected. Only one LED is on at a time
except during Mode 1-6, in which the amber TROUBLE and red ALARM2 LEDs are on. Refer toTable 1 on next page for all combinations. Example: When the mode is set to 1 and TROUBLE
LED is on, Mode 1-1 is selected.

TROUBLE, ALARM2,
ALARM1, MNT and TEST
LEDs correspond to
sub-modes (x-1 to x-5)

When Mode 1-6 isselected, TROUBLE and
ALARM2 LEDs are lit

4. Press the setting wheel up to change the sub-mode. Refer to Table 1 on next page for
information on the modes and sub-modes.

NOTE

・ To perform a setup or adjustment in a different mode, press the LOW button on
the front of the indicator unit. The current mode will end and another mode can beselected.
・ To cancel the value being adjusted in any mode (before saving the adjusted value
by pressing and holding the wheel up), either press the setting wheel up once orpress the LOW button.
・ To end the adjustment, press and hold the HIGH button. This will activate themode lock and the unit will return to normal gas monitoring operation.
- 25 -

The table below lists the modes and sub-modes that can be selected. Refer to the following
pages for their use and adjustment procedures.

Table 1. Modes/Sub-modes List
To confirm (save) the currently selected setting, press and hold the setting wheel up.
ModeFunction
Sub-modeGroup
LED Status
1
2
3

1

Input
adjustment

4

5
*
6

Coarse zero adjustment
Fine zero adjustment
Span adjustment
Coarse span adjustment
One-man maintenancespan adjustment
Fine span adjustment
One-touch zeroadjustment
One-touch 21.0 vol.%adjustment
Heater current adjustment

3

Analogoutputadjustment(For
manufacturer
use only)

1, 2, 3

1, 2 (D),3Red MNT LED is on.

Red TEST LED is on.

2 (O)1, 4, 5AllAll

1

Set alarm value

All

2

―――

All
All

Amber TROUBLE LED and
red ALARM2 LED are on.
Amber TROUBLE LED is on.
Red ALARM2 LED is on.
―――
Red MNT LED is on.
Red TEST LED is on.
―――
―――
―――
―――
―――
Amber TROUBLE LED is on.
―――

Switch brightness of LEDAll
bar graph display
4(high/low)
Display linear dataAll4(for reference only)
5 ―――
1 ―――
2 ―――
(For
5
manufacturer
3 ―――
use only)
4 ―――
5 ―――
*One-touch zero adjustment is not available for units in Groups 4/5.
Other
adjustment

Amber TROUBLE LED is on.
Red ALARM2 LED is on.
Red ALARM1 LED is on.

4, 5

Zero adjustment
Span adjustment―――
3(For manufacturer use only)
Analog output adjustment
4for Maintenance Mode 2
Analog output adjustment
5
for initial delay
1 ―――
2 ―――
3 ―――
4 ―――
5 ―――

1
2
2

1, 3, 4, 5
1, 3, 4, 5
1, 2, 34, 5

Red ALARM1 LED is on.

3- 26 -Red MNT LED is on.
―――
―――
―――
―――
―――
―――

8-3-3. Check and Adjustment of Sensor Heater Current (for Groups 1, 4 and 5)
1. Pull the panel lock knob to remove the indicator unit from the metal housing.
2. Connect a voltmeter having a high internal resistance (min.100 kΩ) to the heater current test
terminals located at the top of the indicator unit. Measure the heater current. A standard
resistor (1Ω) is installed in between the (+) and (-) test terminals. Therefore, for example, if themeasured voltage is 180 mV, it means the current is 180mA.
3. A heater current label is on the right side of the indicator unit. Check that the measured
current is equal to or ±2mA of the value as specified on the label.
Heater current label

Voltmeter

Heater current test terminals

Pull to remove the indicator
unit from the metal housing

4. If the measured current is out of the specified range, it is necessary to adjust the heater
current by following the adjustment procedure below.
5. Deactivate the mode lock (page 24).
6. Select Mode 1-6 for heater current adjustment (pages 25 and 26).
Scroll the setting wheel until
the LED for Mode 1 is on

Side View

7. Scroll the setting wheel to adjust the heater current to the current value shown on the heater
current label.
8. To save the setting, press and hold the setting wheel up until all the bar graph segments are lit
green. Always save a new setting after each adjustment.

8-3-4. Zero (or 21.0 vol.%) Check and Adjustment of Gas Detector- If the bar graph display does not read zero after the warm-up cycle, introduce clean air into
the gas detector and perform a zero adjustment at the gas detector. Refer to the gas
detector’s instruction manual for adjustment procedure.
- For oxygen detection, there are two types of specifications, oxygen leak and low oxygen
detections (the zero value is set to 0 vol.% or 21.0 vol.%). Refer to the delivery specifications
for your indicator unit to find out which specification yours is. For adjustment procedure, referto the gas detector’s instruction manual.

- 27 -

8-3-5. Zero and Span Adjustments of Indicator Unit

NOTE

・ If the gas detector has not been powered for a long period of time (i.e. between
shipment and initial energization), it may take longer for the bar graph display
reading to stabilize.
・ For Types M, O, and D, perform zero (or 21.0 vol.%) and span adjustments at theconnected gas detector. If the indicator unit contiunues to not read zero (or 21.0
vol.%), perform a span adjustment at the indicator unit.
Some detector models (e.g., KD-5D) do not have a zero/span adjustment function.
In this case, perform zero or span adjustment at the indicator unit.

If the bar graph display on the indicator unit does not read zero (or 21.0 vol.%) after an operation
check of the gas detector using its test mode, perform zero and span adjustments on theindicator unit by taking the following steps.
Note: A different zero/span adjustment method needs to be used to adjust an indicator unit thathas linearizer and/or zero suppression function. Contact New Cosmos or its authorized
representative for details.

CAUTION

Perform a zero adjustment in clean air. Proper adjustment is not possible in an atmospherethat may contain target or interfering gases.

Zero Suppression Function
For indicator units with a zero suppression function, the bar graph dislay continues to indicate “0”until the target gas concentration detected by the detector exceeds the pre-set value. The pre-set
zero suppression value is given in the delivery specifications.

- 28 -

(1) Zero/span Adjustment Flowchart
Follow the sequence shown in the flow chart below to perform adjustments.
Zero/Span Adjustment Flowchart for Groups 1, 2 (Type D) and 3
Start zero/span adj.
1
No

Do you want to execute
one-touch zero adj.?

Execute Mode 1-1 coarse zero adj. (page 32)

Yes
Press and hold ADJ button. (page 31)

Is zero adj. result
Good/Not good? *1

Execute Mode 1-2 fine zero adj. (page 33)

2

Not goodYes

Do you want to execute
one-man maintenance?

Good

No
Execute Mode 1-4 one-man
maintenance span adj. (page 35)

Execute Mode 1-3 span adj. (page 34)

End

Figure 17. Zero/Span Adjustment Flowchart for Group 1/2 (Type D)/3
21.0 vol.% Adjustment Flowchart for Group 2 (Type O)
Start 21.0 vol.% adj.

Do you want to executeNo

one-touch 21vol.% adj.?

Yes
Press and hold ADJ button. (page 31)1
Is adj. result

Not good

Good/ Not good? *1

Yes
Good

Do you want to execute
one-man maintenance?

No
Execute Mode 1-4 one-man
maintenance span adj. (page 35)

Execute Mode 1-3 span adj. (page 34)
End

Figure 18. 21.0 vol.% Adjustment Flowchart for Group 2 (Type O)- 29 -

Zero/Span Adjustment Flowchart for Groups 4 and 5
Start zero/span adj.

1

Execute Mode 1-3 coarse span adj. (page 34)

Execute Mode 1-1 coarse zero adj. (page 32)

Execute Mode 1-2 fine zero adj. (page 33)

Execute Mode 1-4 fine span adj. (page 34)

Is span adj. result
Good/Not good? *2

Not good

Good
End
Figure 19. Zero/Span Adjustment Flowchart for Group 4/5

NOTE*1. Good/Not good criteria for zero/21.0 vol.% adjustment
Good: All the bar graph segments are lit green.
Not good: Green POWER LED flashes three times.
*2. Good/Not good criteria for span adjustment
Good: All the bar graph segments are lit green.
Not good: Cannot adjust to the calibration gas concentration value.
*adj.: adjustment- 30 -

(2) One-touch Zero Adjustment (or 21.0 vol.% Adjustment)(2-A) One-touch Zero Adjustment for Groups 1, 2 (Type D) and 3
1. Check that the air around the gas detector is free of target/interfering gases. Press and holdthe ADJ button on the front panel until the green POWER LED turns off.
2. The POWER LED turns off temporarily, and then the zero adjustment will start.
3. Once the adjustment is completed, the POWER LED flashes once.
4. If the adjustment is unsuccessful, the POWER LED slowly flashes three times.
5. If unsuccessful, perform a coarse zero adjustment (3-A).

Press and hold ADJ button

Adjustment during Normal Operation

NOTE

Adjustment using Mode 1-5

・ One-touch zero adjustment can also be performed in Mode 1-5. Set the mode toMode 1-5, then press and hold the setting wheel up to execute a one-touch zeroadjustment.
・ One-touch zero adjustment is not available for Type O units in Group 2.
・ One-touch zero adjustment is not available for units in Group 4/5. Perform a zeroadjustment by taking the steps shown in Figure 19.

(2-B) One-touch 21.0 vol.% Adjustment for Group 2 (Type O)
1. Check that the air around the gas detector is free of target/interfering gases. Press and holdthe ADJ button on the front panel until the green POWER LED turns off.
2. The POWER LED turns off temporarily, and then the 21.0 vol.% adjustment will start.
3. Once the adjustment is completed, the POWER LED flashes once.
4. If the adjustment is unsuccessful, the POWER LED slowly flashes three times.
5. If unsuccessful, perform a span adjustment (5-A).
25

25

20

20

15

15

10

10

5

5

Press and hold ADJ button

Adjustment during Normal Operation

NOTE

Adjustment using Mode 1-5

・ One-touch 21.0 vol.% adjustment can also be performed in Mode 1-5. Set themode to Mode 1-5, then press and hold the setting wheel up to execute a
one-touch adjustment.
・ One-touch zero adjustment is not available for Type O units in Group 2.

- 31 -

(3) Coarse Zero Adjustment(3-A) Coarse Zero Adjustment for Groups 1, 2 (Type D) and 3
1. Deactivate the mode lock (page 24).
2. Select Mode 1-1 (coarse zero adjustment, pages 25 and 26).
(Ensure that a zero adjustment is done before a span adjustment.)
Scroll the setting wheel until
the LED for Mode 1 turns on

3. Check that the air around the gas detector is free of target/interferinggases. Scroll the setting wheel to make the bar graph display read zero.

NOTE

Linearizer is deactivated while in Mode 1-1 or 1-2.
To temporarily activate it, press and hold the ADJ button while in Mode 1-1 or 1-2.

4. To save the setting, press and hold the setting wheel up until all the bar graph segments are lit
green. Always save a new setting after each adjustment.
5. Proceed to (4) below to perform a fine zero adjustment.

NOTE

Always perform a fine zero adjustment (4) after performing a coarse zeroadjustment.

(3-B) Coarse Zero Adjustment for Groups 4 and 5
1. Deactivate the mode lock (page 24).
2. Select Mode 1-1 (coarse zero adjustment, pages 25 and 26).
(Ensure that a zero adjustment is done before a span adjustment.)
Scroll the setting wheel until
the LED for Mode 1 turns on

3. Check that the air around the gas detector is free of target/interferinggases. Scroll the setting wheel to move up or down the bar graph until
the TEST LED is on.
NOTE

・ The TEST LED does not always turn on when the bar
graph display reads zero. Move the bar graph up or down
to find the zone at which the TEST LED will turn on.
・ Linearizer is deactivated while in Mode 1-1 or 1-2.
To temporarily activate it, press and hold the ADJ button
while in Mode 1-1 or 1-2.

4. To save the setting, press and hold the setting wheel up until all the bar graph segments are lit
green. Always save a new setting after each adjustment.
5. Proceed to (4) below to perform a fine zero adjustment.
NOTE

Always perform a fine zero adjustment (4) after performing a coarse zeroadjustment.
- 32 -

(4) Fine Zero Adjustment for all groups except Group 2 (Type O)
1. Deactivate the mode lock (page 24).
2. Select Mode 1-2 (fine zero adjustment, pages 25 and 26).
(Ensure that a zero adjustment is done before a span adjustment.)

Scroll the setting wheel until
the LED for Mode 1 turns on

3. Check that the air around the gas detector is free of target/interfering gases. Scroll the setting
wheel to make the bar graph display read zero.

NOTE

Linearizer is deactivated while in Mode 1-1 or 1-2.
To temporarily activate it, press and hold the ADJ button while in Mode 1-1 or 1-2.

4. To save the setting, press and hold the setting wheel up until all the bar graph segments are lit
green. Always save a new setting after each adjustment.
5. To perform a subsequent span adjustment, go to (5-A) “Span Adjustment” on the next page.

NOTE・ Refer to the gas detector’s instruction manual for zero/span adustment procedure
for the gas detector
・ For Types M, O, and D, perform zero (or 21.0 vol.%) and span adjustments at theconnected gas detector. If the indicator unit contiunues to not read zero (or 21.0
vol.%), perform the adjustments at the indicator unit.
Some detector models (e.g., KD-5D) do not have a zero/span adjustment
function. In this case, perform zero or span adjustment at the indicator unit.

- 33 -

(5) Span Adjustment(5-A) Span Adjustment for Groups 1 to 3
1. Deactivate the mode lock (page 24).
2. Select Mode 1-3 (span adjustment, pages 25 and 26).
3. Apply the calibration gas to the gas detector. Wait until the bar graph display
stabilizes.
4. Make the bar graph display read the calibration gas concentration value byscrolling the setting wheel. (Refer to the gas detector’s instruction manual
for instructions on how to apply gas to the gas detector.)
5. To save the setting, press and hold the setting wheel up until all the bar
graph segments are lit green. Always save a new setting after eachadjustment.

(5-B) Fine Span Adjustment for Groups 4 and 5
1. Deactivate the mode lock (page 24).
2. Select Mode 1-4 (fine span adjustment, pages 25 and 26).
3. Apply the calibration gas to the gas detector. Wait until the bar graph display stabilizes.
4. Make the bar graph display read the calibration gas concentration value by scrolling the setting
wheel. (Refer to the gas detector’s instruction manual for instructions on how to apply gas to thegas detector.)
5. To save the setting, press and hold the setting wheel up until all the bar graph segments are lit
green. Always save a new setting after each adjustment.
6. If the span adjustment is unsuccessful (bar graph display fails to show the calibration
concentration value), perform a coarse span adjustment (6) below.

(6) Coarse Span Adjustment for Groups 4 and 5
If a preceding fine span adjustment (5-B) is unsuccessful, perform a coarse span adjustment by
taking the following steps:
1. Deactivate the mode lock (page 24).
2. Select Mode 1-3 (coarse span adjustment, pages 25 and 26).
3. Apply the calibration gas to the gas detector. Wait until the bar graph display stabilizes.
4. Make the bar graph display read the calibration gas concentration value by scrolling the setting
wheel. (Refer to the gas detector’s instruction manual for instructions on how to apply gas to
the gas detector.)
5. To save the setting, press and hold the setting wheel up until all the bar graph segments are lit
green. Always save a new setting after each adjustment.

NOTE

After performing a coarse span adjustment, always perform coarse and fine zeroadjustments, then perform a fine span adjustment.

- 34 -

(7) One-man Maintenance Span Adjustment for Groups 1 to 3
One-man maintenance span adjustment is a function that enables one operator to perform aspan adjustment by using the peak hold function. The procedure is given below.
1. Enter the maintenance mode (page 23). Deactivate the mode lock (page 24).
2. Select Mode 1-4 (one-man maintenance span adjustment, pages 25 and 26).
3. Move the red segment on the bar graph display to your target peak value by scrolling thesetting wheel. To save the setting, press and hold the setting wheel up until all the bar graphsegments are lit green.

Red segment
Move the redsegment to the target
value. Press and holdthe setting wheel up
to save the setting

4. Once the setting is saved, the bar graph display displays the current gas concentration andthe target peak value (red segment) from step 3 above. The current concentration isdisplayed by green segments with one amber segment on the top. Apply enough calibrationgas (concentration equal to the target peak value) to the gas detector so that the target
concentration is displayed on the bar graph. As the concentration falls, the green segments
indicating the concentration level also fall. The amber segment (peak value) remains in its
peak position.
Amber segment
remains in its peak
position

Red segment
Amber segment

Green segments fall

Green segments

Gas applied

Gas stopped

5. If the red and amber segments are not aligned, press and hold the setting wheel up until the
all the segments are lit green. The red segment will then turn amber, indicating that the span
adjustment is completed.
Red segment turns amber- 35 -

8-3-6. Zero and Span Adjustments of Analog Output
1. Deactivate the mode lock (page 24).
2. Select Mode 2-1 for zero adjustment, or select Mode 2-2 for span adjustment (pages 25 and26).
3. Connect a tester to the terminals (Nos.15 and 16) on the rear of the metal housing.
4. Once Mode 2-1 or 2-2 is selected, the analog output under the zero or span adjustment isshown on the tester. If the reading is not 4mA or 20mA, adjust it to 4mA or 20mA by scrollingthe setting wheel.
5. To save the setting, press and hold the setting wheel up until all the bar graph segments are lit
green. Always save a new setting after each adjustment.
8-3-7. Analog Output Adjustment while in Maintenance Mode 2
The analog current output for Maintenance Mode 2 can be adjusted.
1. Deactivate the mode lock (page 24).
2. Select Mode 2-4 (pages 25 and 26).
3. Connect a tester to the terminals (Nos.15 and 16) on the rear of the metal housing.
4. Once Mode 2-4 is selected, the analog output for the maintenance mode is shown on thetester. If the reading is not 4mA, adjust it to 4mA by scrolling the setting wheel.
5. To save the setting, press and hold the setting wheel up until all the bar graph segments are lit
green. Always save a new setting after each adjustment.

- 36 -

8-3-8. Gas Alarm Operation Check using TEST Button (Test Mode)
1. Press the MNT button to enter the maintenance mode (Refer to 8-2 “Maintenance Mode”).
2. Using a rounded pin, press the TEST button to enter the test mode.
Once the test mode is entered, the bar graph display switches to the test level display. Tochange the test level (simulated gas concentration value), increase/decrease the value using
the HIGH or LOW button.
3. Check the gas alarm operation (e.g., gas alarm
contact output, analog output).
4. Before exiting the test mode, set the test level
below the alarm set value. Failure to do so may
cause an alarm when the test mode is enteredagain, since the previous test level will be saved.
TEST button (recessed)
Press the TEST button to exit the test mode. If theunit is left idle for more than10 minutes, the unit willautomatically exit the test mode.
Increase/decrease
5. If the maintenance mode is activated, press andtest level using
hold the MNT button untill the red MNT LED turns
HIGH/LOW button
off. This ends the maintenance mode and returns
to normal operation.

DANGER

Exit the maintenance mode after an operation check using the test mode. Failure to do
so will result in the alarm contact outputs and the output to the alarm unit not being
activated even if the gas detector detects the target gas concentration in excess ofalarm set value.

CAUTION

Performing an alarm operation check using the test mode activates the analog output,
alarm contact output, and output to the alarm unit. If the alarm contact output is used
to interlock external devices, set the indicator unit to the maintenance mode andrelease the interlocks of the external devices beforehand, as needed, to prevent
possible activation of the interlocks during the operation check.
To disable the alarm contact output and the output to the alarm unit, set the unit to themaintenance mode by referring to 8-2 “Maintenance Mode”.

Notify those concerned before starting a gas alarm operation check.

Entering Modes 1 to 5 resets an alarm. Do not enter any of these modes while an
alarm is active (e.g., alarm set off by gas leak). Before starting an inspection or
adjustment, make sure that the indicator unit has returned to normal gas monitoring
operation (no active alarm) before deactivating the mode lock.

- 37 -

8-3-9. Gas Alarm Setting (Gas Alarm Set Values)
Check that the bar graph displays the alarm set values specified in the delivery specifications.
Alarm setting is normally done at the time of shipment. If the specified values are not displayed,take the following steps for adjustment:
1. Deactivate the mode lock (page 24).
2. Select Mode 4-1 (pages 25 and 26). When Mode 4-1 is entered, the amber segment, whichindicates the 1st stage alarm set value, starts flashing on the bar graph.
3. Adjust the amber segment to the specified alarm set value by scrolling the setting wheel.
4. Press and hold the setting wheel up for about three seconds. The green POWER LED will
flash then turn off and all the bar graph segments will turn green, indicating that the 1st stage
alarm is set. Now the red segment, indicating the 2nd stage alarm set value, starts flashing.

Red segment
Amber segment

1st stage alarm setting

2nd stage alarm setting

5. Adjust the red segment to the specified alarm set value by scrolling the setting wheel.
6. To save the setting, press and hold the setting wheel up until all the bar graph segments arelit green. Always save a new setting after each adjustment.

8-3-10. Trouble Alarm Operation Check(1) For Groups 1 to 3
Check that the trouble alarm will activate by disconnecting the wire from theterminal No.8 (wired to the terminal No. D or G on the gas detector) on the rearof the metal housing. To end the trouble alarm, connect the wire back to theterminal.
Refer to pages 14 to 16 for typical system configurations.
(2) For Groups 4 and 5
Check that the trouble alarm will activate by disconnecting the wire from theterminal No.6 (wired to the terminal No. B on the gas detector) on the rear of
the metal housing. To end the trouble alarm, connect the wire back to theterminal.
Refer to page 17 for a typical system configuration.
Trouble alarm activated- 38 -

CAUTION

A trouble alarm check is performed while powered on. To prevent electrical shocks, do
not perform a trouble alarm check. This check has been done at the time of shipment.
Entering Modes 1 to 5 resets an alarm. Do not enter any of these modes while an alarmis active (e.g., alarm set off by gas leak). Before starting an inspection or adjustment,
make sure that the indicator unit has returned to normal gas monitoring operation (noactive alarm) before deactivating the mode lock.

8-3-11. Operation Check Using Actual Gas
Apply the calibration gas to the gas detector, and check that the bar graph display indicates thecorrect gas concentration value and that the alarm operates correctly.

DANGER

When performing an operation check using actual gas, such as combustible gas which
may have a risk of explosion or toxic gas which may be harmful to human health,
incorrect handling is extremely dangerous. It should be performed by qualified personnel,
or a New Cosmos authorized technician.

8-3-12. Brightness of LED Bar Graph Display
It is possible to switch the brightness of the bar graph display between high and low by scrollingthe setting wheel while in Mode 4-3.

CAUTIONThe high-brightness option consumes more electricity. Set the brightness to high or low
depending on your facilities.

8-3-13. Zero Suppression Deactivation and Linearizer Display(1) Zero Suppression Deactivation
1. Deactivate the mode lock (page 24).
2. Select Mode 1 (pages 25 and 26). The zero suppression is deactivated while in Mode 1.
Scroll the setting wheel until
the LED for Mode 1 turns on

Setting wheel- 39 -

(2) Linearizer Display
1. Deactivate the mode lock (page 24).
2. Select Mode 1-1 or 1-2 (pages 25 and 26).
3. To temporarily activate linearizer, press and hold the ADJ button while in Mode 1-1 or 1-2.
The linearized bar graph reading is shown.
Scroll the setting wheel until
the LED for Mode 1 is on

NOTE

SelectMode 1-1 or 1-2

Linearizer is deactivated while in Mode 1-1 or 1-2.

8-3-14. V-NET Address Setup (for V-NET type only)
A node address can be set up using the rotary switches located on the back of the indicator unit.

High
Low

NOTE

・ To set a node address, convert your desired address
number from decimal to hex notation. Then input the first
digit of the hex value using High switch, and the second
digit using Low switch.
Examples: From 16DEC to 10 HEX
From 200 DEC to C8 HEX
・ The hghest node address is 254 DEC.

- 40 -

Hex

High

Low

8-4. Gas Alarm(1) 1st Stage Alarm
When the bar graph reading exceeds the 1st stage alarm set value (or falls below it in case oflower limit detection, e.g., oxygen detection), the bar graph display will turn amber. The red
ALARM1 LED will start flashing and the 1st stage alarm contact output will be activated.
Alarm unit operation during the 1st stage alarm
The alarm unit operates in conjunction with the indicator units. When it receives analarm signal from one of the indicator units, the alarm unit starts beeping and its red
ALARM1 LED turns on.

Upper Limit Detection

Lower Limit Detection (e.g., O2 detection)(2) 2nd Stage Alarm
When the bar graph reading exceeds the 2nd stage alarm set value (or falls below it in case of
the lower limit detection, e.g., oxygen detection), the bar graph will turn red. Both red
ALARM1 and ALARM2 LEDs will start flashing, and both 1st and 2nd stage alarm contact
outputs will be activated.
Alarm unit operation during the 2nd stage alarm
The alarm unit operates in conjunction with the indicator units. When it receives analarm signal from one of the indicator units, the alarm unit starts beeping and its red
ALARM1 and ALARM2 LEDs turn on.

Upper Limit Detection- 41 -

Lower Limit Detection (e.g., O2 detection)

DANGERWhen a gas alarm activates, stay calm and check that there is no fire in the vicinity. Do
not touch any power switches under any circumstances. Any sparks caused by turning
the switch on or off may lead to ignition.

WARNING

If the indicator unit issues an alarm, take the necessary measures specified by yourcompany.

(3) Dual-range Type Indicator Units (Type M only)
The dual-range type indicator unit monitors gas concentrations in both high and low ranges.
The unit displays the gas concentration for low range (0 to 10%LEL) and for high range (0 to
100%LEL).
The unit normally displays a low range concentration. When the gas concentration reaches
the maximum threshold value (full scale value) of the low range, the TEST/RANGEx10 LED
will turn on and the unit will automatically adjust to display the high range concentration. Whenthe gas concentration drops below the maximum value (full scale value) of the low range, theTEST/RANGEx10 LED will turn off and the unit will automatically return to displaying the low
range concentration.
Dual-range indication is only available with Type M units, and must be specified upon placing
an order.
When the TEST button is pressed, the test mode will be started and the TEST/RANGEx10
LED will start flashing.

“TEST/RANGE×10”
LED is off

Normal Operation“TEST/RANGE×10”
LED is on

Low Range

High Range

Dual-range Type Indicator Unit with Alarm Unit

- 42 -

8-5. Cancel a Gas Alarm
Use the RESET or BZ.STOP button on the alarm unit or cabinet panel to cancel a gas alarm.
Note that the procedure to cancel an alarm varies depending on the system; therefore, refer tothe delivery specifications for your system for detailed information on the alarm mode.
(1) For a combination of a manual-resetting type indicator unit and a full-lock type alarm unit
1. Press the BZ.STOP button on the alarm unit or cabinet panel. The red flashing
ALARM1/ALARM2 LED on the indicator unit will become steady.
2. When the bar graph reading falls below the alarm set value, press the RESET button on thealarm unit or cabinet panel. The bar graph will turn green, indicating that the 1st/2nd stage alarmis canceled. The red ALARM1/ALARM2 LED on the indicator unit will turn off and the alarm
contact output will be deactivated.
Alarm indication/
Contact
Operation

Indicator unit

ALARM1/ALARM2

LED (red)

Indicator unit
Alarm contact
outputGas alarm is active

Flashing

ActivatedOn

Beeping

BZ.STOP button ispressed, and reading
still exceeds the alarm
set valueOn

Activated

On

Muted

Reading falls below thealarm set value

On

Activated

On

Muted

RESET button ispressed (alarm iscanceled)Off

Not activated

Off

Muted

ALARM1/ALARM2

Alarm unit
LED (red)

Alarm unit
Alarm audio(2) For a combination of a manual-resetting type indicator unit and a semi-lock type alarm unit
1. Press the RESET button on the alarm unit or cabinet panel. The red flashing ALARM1/ALARM2
LED on the indicator unit will become steady.
2. When the bar graph reading falls below the alarm set value, the bar graph will automatically turngreen, indicating that the 1st/2nd stage alarm is canceled. The red ALARM1/ALARM2 LED willturn off and the alarm contact output will be deactivated.
Alarm indication/
Contact
Operation

Gas alarm is active
RESET button ispressed, and reading
still exceeds the alarm
set value
Reading falls below thealarm set value (alarmis canceled)

Indicator unit

ALARM1/ALARM2

LED (red)

Indicator unit
Alarm contact
outputFlashing

ActivatedOn

Beeping

On

Activated

On

Muted

Off

Not activated

Off

Muted

ALARM1/ALARM2- 43 -

Alarm unit
LED (red)

Alarm unit
Alarm audio

(3) For an auto-resetting type indicator unit
1. Once the reading on the bar graph display falls below the alarm set value, the bar graph willautomatically turn green, indicating that the 1st / 2nd stage alarm is canceled. The red ALARM
1/ALARM 2 LED will turn off and the alarm contact output will be deactivated.
2. To mute the alarm audio while an alarm is active, press the BZ.STOP button on the alarm unit orcabinet panel. When the alarm audio is muted, the red flashing ALARM1/ALARM2 LED of theindicator unit will become steady as long as the alarm is present.
Alarm indication/
Contact
Operation

Indicator unit

ALARM1/ALARM2

LED (red)

Indicator unit
Alarm contact
outputGas alarm is active

Flashing

ActivatedOn

Beeping

BZ.STOP button ispressed, and reading
still exceeds the alarm
set valueOn

Activated

On

Muted

Reading falls below thealarm set value (alarmis canceled)Off

Not activated

Off

Muted

ALARM1/ALARM2- 44 -

Alarm unit
LED (red)

Alarm unit
Alarm audio

8-6. Trouble Alarm
A trouble alarm will be indicated by the amber flashing TROUBLE LED and the trouble alarm
output will be activated when a problem is detected. Some examples are, gas concentration input
from the gas detector is too low or the flow rate of the extractive-type gas detector with a flow
sensor is too low. Check the cause of the problem and take necessary actions.
The alarm unit emits a steady tone while a trouble alarm is active. Press the BZ.STOP button on
the alarm unit (or RESET button if your alarm unit is semi-lock type) to mute the alarm audio.
Alarm indication/
Contact

Indicator unit

Indicator unit

POWER LED

TROUBLE LED(green)Trouble alarmis active

Alarm unit
TROUBLE LED(amber)Indicator unit
Trouble alarm
contact output

On

Flashing

Activated

On

Steady tone

BZ.STOP (orRESET) button
is pressed andproblem is stillpresent

On

Flashing

Activated

On

Muted

Problem has
been solved

Flashes atstart ofwarm-upcycle, thenturns steadyonce thecycle is over,or
immediately
turns on if the
problem wasinsufficient
flow rate.

Off

Not activated

Off

Muted

(amber)Alarm unit
Alarm audio

Operation- 45 -

Trouble Alarm Causes and ActionsFirst step is to always remove the fuse from the fuse holder and check it. If it is not blown theninvestigate for other causes and take appropriate steps. If the product does not reset to normal
operation after taking the steps shown in the table below or if your problem is not listed in thetable, please contact New Cosmos or its authorized representative.
Location ofproblem
Indicator unit

Possible cause
Blown fuse

Drop in power
voltage

LED status
of indicator unit
All LEDs: Off

Green POWER LED: On
Amber TROUBLE LED:
Flashing

Indicator unit
or gasdetector

Gas detector

Internal
EEPROM failure

Gas concentration bar graphdisplay: Off

External
EEPROM failure

Amber TROUBLE LED:
Flashing

Red ALARM2 LED: Flashing
Broken cableGreen POWER LED: On
between indicator
unit and gas
Amber TROUBLE LED:
detector
Flashing

Low flow rate ofextractive-type
gas detector *Green POWER LED: On

Broken wire of
sensorGreen POWER LED: On

Sensor failure

Amber TROUBLE LED:
Flashing

Amber TROUBLE LED:
Flashing

Steps
Remove the fuse from thefuse holder. Remove thecause of excessive current,
then replace the fuse with a
new one. Refer to 5 “Unit
Dimensions andComponents”.
If the power voltage falls to
18 V or less, a trouble alarm
will activate. Ensure that thepower voltage is maintained
at 24 V±10%.
Setting data needs to be
initialized. Contact New
Cosmos or its authorized
representative for support.

If no break in the cable isfound, check that all wiring iscorrect and that theconnection is secure (e.g.,loosening of terminal
screws). Refer to 7 “Wiring
and Connections”.
Remove clogs in the inlet
port or piping of gas
detector. If the filter in theflow checker is dirty, replace
it with a new one. Refer tothe gas detector’s
instruction manual.
Contact New Cosmos or its
authorized representative
for sensor replacement.

* Applicable only to an extractive-type gas detector with a flow sensor that outputs low flow rate signals.

- 46 -

9. MaintenanceRoutine Check
Perform a routine check given in the table below.
Frequency

Routine Check(to be performedby user)

Daily

Monthly

Description
・Green POWER LED
Check that the POWER LED turns on andthat the indicator unit works.
・Indication of bar graph display
Check that the indication/reading of the bar
graph display shows normal operation.
・Alarm operation check using TEST button
Press the TEST button to check that the gas
alarm is functional.

Important Notice for Scheduled Inspection
In order to ensure the reliability of the gas detection and alarm system, it is vital toperform periodic maintenance and inspections. It is highly recommended that amaintenance contract with a local New Cosmos representative be made for the
performance of scheduled inspections.
Installation, inspection, maintenance, calibration, and proof testing shall only be
performed by trained personnel.

CAUTION

Performing an alarm operation check using the test mode activates the analog output,
alarm contact output, and output to the alarm unit. If the alarm contact output is used tointerlock external devices, set the indicator unit to the maintenance mode and release
the interlocks of the external devices beforehand, as needed, to prevent possible
activation of the interlocks during the operation check.

Notify those concerned before starting a gas alarm operation check.

Perform maintenance inspections in accordance with applicable laws and regulationsof the country where the unit is used. For example, if used in Japan, circuitry tests(using the TEST button) related to alarm functions must be performed at least once amonth, and detection and alarm tests must be performed at least once a year as
specified by the Japanese liquefied petroleum gas safety act and high pressure gas
safety act.

- 47 -

10. Troubleshooting
Before requesting repair, please refer to the table below. If the unit does not return to normal
operation after performing the corresponding steps in the table, or if your issue is not found in thetable, contact New Cosmos or its authorized representative.
Problem

Powering-up does
not turn on the green
POWER LED

Possible cause

Steps

Power switch is set tothe off position

Set the power switch
to the on position.

8-1. Start-up(page 22)

Incorrect or loose
wiringCheck and rewire.
Retighten terminal
screws.
Replace the fuse witha new one.

7. Wiring andConnections(page 13)
Trouble Alarm Causesand Actions (page 46)

Broken cable between
indicator unit and gas
detector, or incorrect
wiringCheck for broken wireand rewire.

8-6. Trouble Alarm(page 45)

Broken sensor wire

Replace the sensor
with a new one.

Flow rate ofextractive-type gas
detector is too low

Check that inlet andpiping of extractive
type gas detector are
free of clogging.
Adjust power voltage
to 24 V±10%.

Blown fuse

The amber
TROUBLE LED on
the indicator unit isflashing.
The amber
TROUBLE LED on
the alarm unit is on,
and a steady tone isheard.

Power voltage is 18 V
or less- 48 -

Reference11. Specifications
Product Name

V3 series indicator unit

V-SC-1, V-SC-1(S), V-SC-4B*1, V-SC-4B(S)*1, V-SC-6*2, and V-SC-6(S)*2
As per specifications of gas detector
2 stages
3-colored LED (red, amber, green) bar graph display (50 segments)
As per specifications of gas detector
As per delivery specifications
As per delivery specifications
・ Combustible gas: ±25% of alarm set value under identical conditions
Alarm accuracy
・ Toxic gas: ±30% of alarm set value under identical conditions
・ Combustible gas: Less than 30 seconds with a gas concentration that is 1.6
times higher than the alarm set concentration
Alarm delay
・ Toxic gas: Less than 60 seconds with a gas concentration that is 1.6 times
higher than the alarm set concentration
Note: Delay time caused by piping length excluded
・Gas alarm in 2 stages: 1st stage, red ALARM1 LED flashes; 2nd stage, both
ALARM1/2 LEDs flash; and steadily lit if reset as long as alarm is active
Alarm・Auto-resetting or manual-resetting (must be specified upon placing an order)
・Trouble alarm: Amber TROUBLE LED flashes when a device failure (of aconnected gas detector or indicator unit itself) is detected
1st stage, 2nd stage, and trouble, dry contact outputs
Normally open or closed, and normally energized or non-energized as per
Alarm contacts
delivery specifications.
Max load: 100 VAC at 1A, 24 VDC 1A (resistive load)
Analog output
4-20mA (standard) or 1-5 V (must be specified upon placing an order)
EMC directive ( 2014/30/EU/SI 2016 No.1091 ) and RoHS directive*1
Compliance( 2011/65/EU+(EU)2015/863/SI 2012 No.3032 )Power source
24 VDC ± 10% (24 VDC ± 6 V depending on the gas detector connected)
Approx. 5.0 W (when connected to gas detector with 24V power source andlow-brightness display mode and compatible with V2 series (Groups 1, 2, 3 & 5).
Approx. 4.0 W (when connected to gas detector with 24V power source andlow-brightness display mode and compatible with V1 series (Group 4).
Power consumption
Approx. 7.0 W (when connected to gas detector with 24V+6V power source andhigh-brightness display mode and compatible with V2 series (Groups 1, 2, 3 & 5)
Approx. 5.0 W (when connected to gas detector with 24V+6V power source andhigh-brightness display mode and compatible with V1 series (Group 4).
Dimensions
W36 x H144 x D70mm (excluding metal housing and protrusions)
Mass
Approx.150g (excluding metal housing)Operating temperature: -10 to +40°C
Operating conditions
Operating humidity: 10 to 90%RH
No sudden temperature/humidity change. No condensation.
Connection method
Connected by cable connectors
Installation method
To be installed into metal housing or wall-mounted cabinet.
Degree of protection
IP2X when installed.
* The above specifications are subject to change without notice due to product improvement.
* End-user-specific delivery specifications, if available, supersede the standard specifications above.
*1. CE marking specification option must be specified upon placing an order. The following
combinations comply with CE marking. Refer to the separate EU Declaration of Conformity.
Type M indicator unit solo
Type M indicator unit with VAS alarm unit
Type M indicator unit with RST-01 reset relay terminal
Type M indicator unit with VAS alarm unit and RST-01 reset relay terminal
Note: Type M indicator is paired with a V-SC-4B or V-SC-4B(S) metal housing and VAS alarm unit ispaired with a V-SC-A or V-SC-A(S) metal housing.
*2. Dedicated to use in V-NET system and must be specified upon placing an order.
Metal housing
Detection principle
Number of alarm stages
Indicator
Target gas
Indication range
Alarm set range- 49 -

12. Warranty
The warranty period is one (1) year from the date of purchase.
The purchaser is entitled to the limited warranty, if the product malfunctions due to a
manufacturing defect during normal use in accordance with the instruction manual, specifications
and labels.
1. 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 afree replacement and repair service. This warranty covers the New Cosmos product/parts only andnot third party product/parts.
2. 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 otheracts of 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.

13. Life Expectancy
The design life expectancy of this product is ten (10) years, which is only estimation, under normal
environmental conditions. The design life expectancy also assumes that the calibration is
performed properly and periodically, but does not imply that the product will operate correctly until
the design life expectancy expires. Thus, no warranty will be given after the one year warranty
period is over. Please also note that even if the product is calibrated, it may fail to operate correctly
before the next calibration.

- 50 -

14. Glossary
TermDefinition

Gas detector

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

Target gas

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

Detection range

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

Linearizer

A function that coverts the output of a hot-wire semiconductor sensor
to make its input-output relationship linear so that the gas
concentration can be displayed as a graph/meter that has a linear
scale for direct reading.
For indicator units with a zero suppression function, the bar graphdislay continues to indicate “0” until the target gas concentration
detected by the detector exceeds the pre-set value. The pre-set zero
suppression value is given in the delivery specifications.
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.

Zero suppression

Alarm accuracy

Alarm delay

The length of time a gas detector takes to activate an alarm after it is
exposed to a target gas concentration higher than the alarm set
value or to some other specified conditions.

Operating temperatureand humidity ranges

Ambient temperature and humidity ranges in which the gas detection
and alarm system can operate normally.

Explosion-proof
enclosure

Enclosure in which the parts which can ignite an explosive
atmosphere are placed. This enclosure can withstand the pressure
created during an internal explosion of an explosive mixture, andprevent the ignition of an explosive atmosphere outside theenclosure.

Calibration gas (test gas)

Gas specifically prepared to calibrate the gas detection and alarmsystem.

Alarm set value

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

Maintenance andinspection

Activities performed to ensure that equipment operates normally andcorrectly.

Self-resetting or
auto-resetting

When the gas concentration falls below the gas alarm set value afteran alarm has been signaled, the ALARM LEDs, relevant gas alarm
contacts will automatically return to their normal positions/statuses.

Manual-resetting
or self-holding

Even if the gas concentration falls below the gas alarm set value
after an alarm has been signaled, the ALARM LEDs, relevant gas
alarm contacts will not automatically return to their normal
positions/statuses. Manual operation is only possible when the gas
concentration is below the gas alarm set value.

- 51 -

15. Sensor Stabilization Warm-up Duration
NOTE

Before zero/span adjustment or gas sensitivity check (gas concentration
adjustment), the sensor output must be stable. To fully stabilize the sensor
output of the connected detector, energize the detector for the recommended
period of time. See Table 2 below. The recommended warm-up duration(energized time) of the detector varies depending on the sensor detection
principle and non-energized period.
Table 2. Recommended Sensor Stabilization Warm-up Duration

Type: Hi, Hv (Hot-wire semiconductor sensor)
Non-energizedWarm-up duration
period< 12 hours
1 hour or more< 24 hours
3 hours or more
More than half of< 14 days
non-energized period
1 month ≤7 days or more

Type: Zn (O3 type semiconductor sensor)
Non-energizedWarm-up duration
period< 12 hours
1 hour or more< 24 hours
3 hours or more
More than half of< 14 days
non-energized period< 1 month
7 days or more
< 3 months
10 days or more
3 months ≤14 days or more

Type: Ti, Tv (Thermal conductivivy sensor)
Non-energizedWarm-up duration
period< 1 year
1 hour or more
1 year ≤24 hours or more

Type: Ci , Cv (Catalytic sensor)
Non-energizedWarm-up duration
period< 1 year
1 hour or more
1 year ≤24 hours or more

Type: D (Electrochemical sensor)
Non-energizedWarm-up duration
period< 6 months
24 hours or more
Recommended for sensors stored lessthan 6 months.

Type: O (Galvanic cell sensor)
Non-energizedWarm-up duration
period< 2 months
30 minutes or more
Recommended for sensors stored lessthan 2 months.

* For Type M, the recommended warm-up cycle varies depending on the gas detector
conneccted. Refer to the gas detector’s instruction manual, or contact us.
* The recommended warm-up cycle in the tables above is subject to change due to productimprovement.
* Non-energized period is the duration until the unit is energized again.

- 52 -

This page intentionally left blankRevision History
Edition
GAE-041-00
GAE-041-01
GAE-041-02
GAE-041-03

Date
May 2012
July 2020
October 2021
September 2022

Revision00 (Initial issue)
01
02
03

Additional copies of this instruction manual may be purchased.
Contact New Cosmos or its authorized representative for ordering
The contents of this manual are subject to change without notice.

Authorized representative:

Manufacturer:
NEW COSMOS ELECTRIC CO., LTD.
2-5-4 Mitsuya-naka, Yodogawa-ku,
Osaka 532-0036, Japan
https://www.newcosmos-global.com