CO Sensor Device for Underground
Parking Garage Ventilation System
Model KS-7DU

Instruction Manual

Keep this Instruction Manual available for quick reference when needed.
Read this Instruction Manual and understand the information thoroughly before using.
This Instruction Manual describes the standard specification. For the users’ specification,
see the separate delivery specifications.

Instruction Manual No.
GAE-121-01
December 2016

Table of Contents
1. Introduction ................................................................................................................................1
2. Precautions ................................................................................................................................2
3. Contents in the Package and Options .......................................................................................3
4. Dimensions, Part Names and Functions ...................................................................................4
4-1. External Dimensions, Part Names and Functions .............................................................4
4-2. Part Names and Functions ................................................................................................5
5. Installation Instructions ..............................................................................................................6
6. Wiring ........................................................................................................................................96-1. Assembling of Pin Terminals and Insulation Caps ...........................................................10
6-2. Connecting and Disconnecting to Terminal Block ............................................................ 11
6-2-1. Terminal Block for Power Source .............................................................................. 11
6-2-2. Terminal Block for External Output ............................................................................ 11
6-3. Banding Band ...................................................................................................................12
7. Operating Procedure ...............................................................................................................13
7-1. Before Use .......................................................................................................................13
7-2. Operating Procedure ........................................................................................................13
7-3. Operation and Function....................................................................................................15
7-3-1. LCD ...........................................................................................................................15
7-3-2. Status of Normal Operation .......................................................................................15
7-3-3. Full Scale and Set Value ...........................................................................................16
7-3-4. Displaying Peak Value and Reset .............................................................................16
7-3-5. Performance of Gas Alarm ........................................................................................16
7-4. User Mode ......................................................................................................................16
7-4-1. Operation of User Mode ............................................................................................16
7-4-2. Switching the Maintenance Function ON and OFF [Mode Number 1] ......................17
7-4-3. Zero Adjustment [Mode Number 2] ...........................................................................17
7-4-4. Span Adjustment [Mode Number 3] ..........................................................................18
7-4-5. Contact Operation Test [Mode Number 4] .................................................................18
7-4-6. History Confirmation [Mode Number 5] .....................................................................19
7-4-7. Clock Setting [Mode Number 6] ................................................................................20
7-5. Maker Mode .....................................................................................................................22
7-5-1. Shift to Maker Mode ..................................................................................................22
7-5-2. Initialization of Cumulative Operation Time ...............................................................23
8. Maintenance Check .................................................................................................................25
8-1. Inspection Contents and Frequency ................................................................................25
8-2. Clock Battery Replacement .............................................................................................26
9. Troubleshooting .......................................................................................................................29
10. Specifications.........................................................................................................................31
11. Warranty ................................................................................................................................32
12. Detection Principle ................................................................................................................33
13. Glossary ................................................................................................................................34

1. Introduction
Thank you for purchasing the KS-7DU CO Sensor Device for Underground Parking Garage
Ventilation System.
The KS-7DU CO Sensor Device for Underground Parking Garage Ventilation System is a sensor for
carbon monoxide, which is toxic and combustible gas, as a sensor part of the ventilation system inunderground parking garage in non-hazardous area.
It activates the contact system and analog signals (4-20mA DC) to send signals to the control panel
when it reaches to the operating setting set value.
Read this Instruction Manual thoroughly before installing and using the CO Sensor Device for proper
operation.

The following symbols are used for safety purposes.
DANGER : Indicates hazardous situation that may result in serious injury or
death, if not avoided.
WARNING : Indicates potentially hazardous situation that may result in serious
injury or death, if not avoided.
CAUTION : Indicates potentially hazardous situation that may result in minor
injury or physical damage, if not avoided.
NOTE: Indicates operational advices.

-1-

2. Precautions
Read the following instructions thoroughly for proper operation. Ensure to install and operate the CO
Sensor Device in accordance with applicable laws and regulations.
WARNING▪ This CO Sensor Device is not explosion-proof structure. Install in a non-hazardous
location.
▪ Make sure to fix the cover with cover fixation screws, as it may not be able to detect
properly.
CAUTION▪ Do not disassemble, alter, or change the structure or electric circuits of the CO Sensor
Device, as it may affect its performance.
▪ The CO Sensor Device is not drip-proof structure. Keep liquids away from the CO
Sensor Device.
▪ Use the CO Sensor Device in accordance with applicable laws and regulations.
▪ By the sensor structure, the mounting position of the CO Sensor Device is specified.
Make sure to install the CO Sensor Device in accordance with “5. Installation
Instructions” on page 6.
▪ By the structure, when it is not stored accordance with the instructions on package, thesensor output may decrease temporarily for one week after installation. Thisphenomenon will be recovered to the normal output within one hour and then it will
operate normally. (It may take 2 hours if the storage period is long.)▪ For use of analog outputs of the CO Sensor Device to the concentration display ofupper monitoring software, process the software of zero suppression. The analog
output resolution of the CO Sensor Device is 250 to 400 (depending on the full scalesetting). Because of the difference in resolution of upper monitoring software ordifference in concentration digit, and changes in connected impedance, some errors
may be observed in the concentration indicator. Set the error threshold to 1.0mA for
analog output.

-2-

3. Contents in the Package and Options
The following items are enclosed with the KS-7DU CO Sensor Device for Underground Parking
Garage Ventilation System. Carefully check that all items listed below are included before use. If any
items are broken or missing, contact your New Cosmos representative.
Standard Accessories
Items

Qty

Reference

CO Sensor Device

1

Model KS-7DU

Mounting Screw

2

M5 x 12 with spring washer, to mount the Sensor Device

Banding Band1

To bundle the electric wire

Pin Terminal

9

For clamping connection to the terminal block

Insulation Cap

9

For electrical insulation by inserting to crimping terminal

Instruction Manual

1Installation Manual

1

Inspection Report1(select review of instruction manual)-3-

4. Dimensions, Part Names and Functions
4-1. External Dimensions, Part Names and Functions

No.

Name

Function1

CoverSlide upward to operate the Main Power Switch and for external
wiring. Keep the cover closed under normal use.

2

Screw Cover

Covering the mounting screws of the CO Sensor Device and fixationscrews of cover. Keep open for installation and deinstallation, andclose for normal operation.

3

Gas Detection Port

Detects gas by internal sensor module.

4

Status Lamp

N/A

5

LCD

Displays the carbon monoxide concentration and information.

6

nd

2

Stage Alarm Lamp

N/A

7

1 Stage Alarm Lamp

N/A

8

UP Switch

During normal operation, press to display upper limit peak value ofCarbon Monoxide concentration after power activation on LCD. Also
to use for setting by a combination of each switch.

9

DOWN Switch

Use for setting by a combination of each switch.

10

Reset Switch

During normal operation, press to display the full scale and set value
for contact operation.

11

Power Switch

Press and hold to turn ON/OFF the power.

st

-4-

12

Buzzer HoleTo emit the operation notification sound.

13

Cable Inlet

Connect to external wiring. Use by cutting with nipper.

14

Maintenance Switch

Use for setting.

4-2. Part Names and Functions

No.

Name

Function1

CoverSlide upward to operate the Main Power Switch and for external
wiring. Keep the cover closed under normal use.

2

Screw Cover

Covering the mounting screws of the CO Sensor Device or fixationscrews of cover. Keep open for installation and deinstallation, andclose for normal operation.

3

Cover Fixation Screw

To fix the cover (inside the screw cover)4

Terminal Box

Connect with the external wiring.

5

Main Power Switch

Turn ON/OFF the Main Power Switch.

-5-5. Installation Instructions
WARNING
This CO Sensor Device is not explosion-proof structure.
Install in a non-hazardous location.

CAUTION
▪
▪

▪
▪
▪
▪

Handle with care to avoid damaging the CO Sensor Device caused by dropping or
hitting, as it may affect the detection performance.
Do not install the CO Sensor Device in locations listed below.
Outdoor or places where it may be exposed to direct water.
Places where the ambient condition is out of the following range.
Temperature: between -5 and +40 degrees C (without rapid temperature changes)
Humidity: between 30 and 85% RH (non-condensing).
Places where corrosive gas may exist.
Places where it is susceptible to impact or vibration.
Places where high-frequency or magnetism is generated.
Places where electrical noise is generated.
Install in a location where the maintenance can be performed easily.
Installation position of sensor should be upward in a vertical direction. If it is installed
upside-down or sideways, it may not detect properly.
Installation height should be 150 cm from the floor to the gas detection port, in a places
without obstruction to detect gas.
Make sure to fix the cover with cover fixation screws, as it may not be able to detect
properly.

NOTE▪ Leave a space at least 30 mm of clearance from side to side for replace.
▪ Leave a space at least 200 mm of clearance from the bottom and 50mm fromthe top for sliding the cover.
▪ Create a space for cabling under the CO Sensor Device.

-6-

50

Clearance forcover to slideGasdetection
port

Mounting hole
Cable inlet▪

Install the CO Sensor Device with M5 internal thread of mounting screws (2-point, pitch 134)
according to the following procedure.
1.
2.
3.
4.

Open the screw cover
Place a provided mounting screw temporarily (Upper side)
Loosen the cover fixation screws
Pull the cover
3. Loosen the screw
4. Pull the cover
1. Open the screw cover

Screw Cover

2. Place a mounting
screw temporarily

-7-

Cover

5.
6.
7.

Slide the cover upward (Open)Tighten the provided mounting screw (Bottom side)
Slide down the cover (Close)
7. Slide down the cover

5. Slide the cover upward

6. Tighten a mounting screw

8.
9.
10.
11.

Push the cover to the body caseTighten a provided mounting screw (Upper side)
Fix the cover with cover fixation screw
Close the screw cover

10. Tighten cover fixation screws
9. Tighten a mounting screw

8. Push the cover
Body case

CAUTION
Make sure to fix the cover with
fixation screws, as it may not beable to detect properly.

-8-6. Wiring
WARNING▪
▪

Make sure to turn OFF the power supply before starting the wiring work for electric
shock prevention.
Close the cover after the wiring to prevent electric shock.

CAUTION
▪

▪
▪
▪

▪

▪

New Cosmos does not accept any liability whatsoever for any resulting damage forcontrolling the interlock by applying the Carbon Monoxide concentration output (analog
output, alarm relay output).
Pay attention to the terminal marking on terminal block for connection.
Keep the connection cable away from the electrical power line.
The analog output of the KS-7DU CO Sensor Device is not insulated from the power
supply. When using the KS-7DU CO Sensor Device with other equipment, provide
electrical insulation to prevent sneak current.

The wiring slot is located by knockout hole on theback and bottom side. Cut and open the wiring
slot with nipper.
2
Use shielded cables (0.5 to 1.25 mm ) within
500m and outside diameter of 10.5mm or less.

Knockout hole of the back

Knockout hole on the bottom
24V DC

Signal+-ZA1 ZA2

TA

COM

Ｄ Ｃ

P

＋

Power SourceN－

24V DCＥ

Earth ground

Signal＋Analog output－

4 to 20mA DC

st

Ｅ

ZA1

1 alarm contact (non-voltage 1a or 1b)

-

Ｎ

ZA2

2

Ｐ

TA

Malfunction contact (non-voltage 1a or 1b)+

COM

Common

D
C

-9-

nd

alarm contact (non-voltage 1a or 1b)

Non-use6-1. Assembling of Pin Terminals and Insulation Caps
Recommended Parts
Names

Model (manufacturer)

Reference2

Shielded cable (0.5 to 1.25mm )Electric Cable-

Pin Terminal

TC1.25-16 (NICHIFU)

Included with shipment (for twisted wire 0.25 to 1.65mm )Insulation Cap

VC1.25 (NICHIFU)

Included with shipment

Crimp Tool

NH1 (NICHIFU)

10.5mm or less in outer diameter2

Nominal size compatible terminal 1.25 for uninsulated
terminal

Terminal Block (reference)
Use

Model (manufacturer)

Power Terminal Block
External Output Cable

ML-1400-S1L-3P

Reference
Fit diameter: 0.65mm to 1.6mm(SATO PARTS)FFKDSA1/H1-5, 08-8

Fit diameter: 0.2mm to 1.5mm(PHOENIX CONTACT)

1. Wire Strip
The recommended dimension of the end of
stripped wire for assembling pin terminal is
5.5mm.

5.5

2. Pin Terminal
Attach the pin terminal to the stripped wire.
Push until the core of stripped wire is viewed
1mm from the center of pin terminal.

1

Pin Terminal

3. Pin Terminal Crimp
Crimp the center point of pin terminal.
Crimp Point

4. Insulated Cap
Insert the insulated cap from the top of crimp pin
terminal.
Insulated Cap

NOTE

Insert the insulated cap all the way into
the pin terminal, as it may cause
disconnection due to the short length ofinsertion.

- 10 -(Push all the way in)6-2. Connecting and Disconnecting to Terminal Block
6-2-1. Terminal Block for Power Source(To disconnect)(To connect)

Insert the pin terminal to electric inlet hole.

Press the release button with a precision
screwdriver (recommended chip thickness:
2.6mm) and pull the pin terminal.

6-2-2. Terminal Block for External Output(To connect)(To disconnect)

Insert the pin terminal to electric inlet hole.

Press the release button with a precision
screwdriver (recommended chip thickness:3mm) and pull the pin terminal.

- 11 -

6-3. Banding BandIt has a place to thread a banding band near the cable inlet
inside the case for bundling cables (see figure at right).
At first, through the banding band, form a ring, through thecables in the circle before wiring, and bundle the cables atthe end.
Banding Band

Lower cable inlet- 12 -

7. Operating Procedure
7-1. Before Use
WARNING▪

Before supplying the power, confirm the power specification of the equipment and thepower supply voltage.
 24V DC +/-10%
CAUTION

▪
▪

▪
▪
▪

Before turning ON the power, make sure all the connections of each part are correct, inreference to “6. Wiring” on page 9 or separate delivery specifications if it is provided.
By the sensor structure, when a sensor is not stored accordance with the instructions
on package, the sensor output may decrease temporarily for one week after
installation. This phenomenon will be recovered to the normal output within one hour
and then it will operate normally. (It may take 2 hours if the storage period is long.)
Make sure there is no gas around (clean air) before use.
If the sensor is not stabilized, the external contact may function after warm-up
operation. Release the interlock of external device as needed.
During the warm-up operation, the analog signal output will be fixed at 4 mA and theexternal contact does not function.

7-2. Operating Procedure
1) Follow the steps 1, 3, 4, 5 of “5. Installation
Instructions” on page 6 to slide and open the
cover partly.
1. Open the screw cover.
3. Loosen the cover fixation screws.
4. Pull the cover.
5. Slide the cover upward. (Open)Screw Cover

Cover
Main Power
Switch2) Turn ON the Main Power Switch (up).

Partlyopen- 13 -

3) Follow the steps 7, 8, 10 of “5. Installation
instructions” on page 6 to close the cover andscrew on.
7. Slide down the cover. (Close)
8. Push the cover to the body case.
10. Fix the cover with cover fixation screw.

LCD

CAUTION

Power Switch

Make sure to fix the cover with cover
fixation screws, as it may not be able
to detect properly.

4) Press the Power Switch for 3 seconds. (pip, beep)
The status lamp flashes in green and “- - - -“ isdisplayed on LCD to start warm-up operation (for90 seconds).

Warm-up operation

Normal Operation5) After the warm-up operation, the gas concentration displays on LCD and starts normal operation.
CAUTION
If the power is on and the carbon monoxide concentration indicates negative, turn off thepower once, and turn on again after one hour (when the sensor is stabilized).

6) Conduct a contact operation test. (See “7-4-5. Contact Operation Test” on page 18.)7) To turn OFF the power, press the Power Switch and Maintenance Switch for 3 seconds. Turn off
the Main Power Switch after the operation is stopped and the LCD is turned off.
NOTE

To press the Maintenance Switch, use an unpointed thin stick such as a precision
screwdriver.

- 14 -

7-3. Operation and Function
7-3-1. LCD
1

2

3

4

5
8
No.

7

Name

6
Description

1

AL1 Contact

Will be displayed during the AL1 contact operation

2

AL2 Contact

Will be displayed during the AL2 contact operation.

3

Sensor Replacement

Will be displayed to to notify the sensor replacement

4

Concentration/Information

Indicates the gas concentration, error, etc.

5Concentration Unit

A unit of gas concentration

6

Clock Battery Level

Indicates the clock battery level is low

7

History

Indicates when the history is displayed

8

Maintenance Function

Indicates when the maintenance function is ON

7-3-2. Status of Normal Operation

Switches

The concentration will be displayed on the LCD innormal operation.

Power Switch
Reset Switch
UP Switch
DOWN Switch
Maintenance Switch- 15 -

7-3-3. Full Scale and Set Value
Press the Reset Switch. (Beep)
It will be displayed in order of “full scale concentration”, “AL1 operation set value”, and “AL2operation set value”.

Full scale: 75ppm

AL1 operation set value: 25ppm

AL2 operation set value: 25ppm

7-3-4. Displaying Peak Value and Reset▪ Press the DOWN Switch (Beep). “The lowest peak value after power activation” and “PEAK” will be
displayed alternately.

(The peak value is 15ppm)▪ To return to normal mode, press the Reset Switch (beep).
After displaying “full scale and operation set value”, it returns to the gas concentration display.
▪ To reset the peak value, press the UP and DOWN Switches at the same time.
The peak values are reset and it returns to the normal gas concentration display.

7-3-5. Performance of Gas Alarm▪ When the carbon monoxide concentration reaches the operation set value, the contact output will
be switched.

7-4. User Mode
NOTE

▪ In User Mode, the gas detection, contact output, and analog output will function
the same way as in normal mode.
▪ Make sure to return to the normal mode after User Mode.

7-4-1. Operation of User Mode
▪ To enter user mode, press the Maintenance Switch(beep) when the power is ON.
“1” (mode number) and “MT” (abbreviation) will be
displayed alternately.
NOTE

To press the Maintenance Switch, use an unpointed thin stick such as a precision
screwdriver.

▪ To change the mode number, press the UP and DOWN Switches.
▪ To select the mode number displayed on LCD, press the Maintenance Switch.
To return without selecting the mode, press the Reset Switch.
▪ To execute in each mode, press the Maintenance Switch for 3 seconds.
▪ To return to “Normal Mode”, press the Reset Switch for 5 seconds.

- 16 -

Mode
Switching Maintenance Function ON/OFF
Zero Adjustment
Span Adjustment
Contact Operation Test
History Confirmation
Clock Setting

Mode No.
1
2
3
4
5
6

Abbreviation
MT
0.0 ppm* * * ppm
AL T
AL H
DATE

7-4-2. Switching the Maintenance Function ON and OFF [Mode Number 1]
WARNING▪ When the maintenance function is ON, external contact and alarm sound will not function.
Make sure to switch OFF the Maintenance Function for the normal operation.

1) In user mode, select Mode Number “1”.
“MT” and “1” (mode number 1) will be displayedalternately.
2) Press the Maintenance Switch. (Beep)“OFF” will flash.

3) Press the UP Switch (beep).
“ON” will flash.
4) Press the Maintenance Switch for 3 seconds (beep, beep, pi, pi) <Select>
Maintenance icon is displayed, and “1”and “MT” will be displayed alternately.
Maintenance icon

NOTE

When the maintenance function remains ON andreturns to the normal operation, maintenanceicon will stay displaying and “concentration
value” and “- - - -“ will be displayed alternately.

5) To switch OFF the maintenance mode, follow theabove 1 to 4 steps and change to “OFF” from "ON".
Confirm the maintenance icon is disappeared.

7-4-3. Zero Adjustment [Mode Number 2]
CAUTION▪
▪

Make sure there is no gas around (in clean air) before performing zero adjustment.
If zero adjustment is not performed correctly, it can not detect properly.

- 17 -

1)

In user mode, press the UP Switch (beep) to select“Mode Number 2”. “0ppm” and “2” (mode number)will be displayed alternately.

2)

Press the Maintenance Switch (beep)
The current carbon monoxide concentration (ppm)
will be displayed.

3)(The concentration is 5ppm)

Confirm there is no gas around and press the
Maintenance Switch for 3 seconds (beep, beep, pi,pi). <Execute>“2” (mode number) and “0ppm” will be displayedalternately, and zero adjustment is complete.

7-4-4. Span Adjustment [Mode Number 3]
CAUTION▪
▪

Contact your New Cosmos representative for span adjustment.
Do not use this mode. It cannot detect properly with the wrong adjustment.

In user mode, press the UP Switch (beep) to select“Mode Number 3”.
The span adjustment concentration (ppm) and “3” (modenumber) will be displayed alternately.
(Span adjustment concentration is 75ppm)

7-4-5. Contact Operation Test [Mode Number 4]▪ When the contact operation test is performed, the concentration of contact operation test will be
displayed on the LCD, and appropriate analog output will activate for test.
NOTE

If the maintenance function is ON, the external contact will not activate (analog
output will activate).

1) In user mode, press the UP Switch (beep) to
select “Mode Number 4”.
“AL T” and “4” (mode number) will be displayedalternately.
2) Press the Maintenance Switch. (Beep)
The current contact operation test concentration
value (ppm) will be displayed.

(Test concentration
value is 75ppm)

3) Press the UP and DOWN Switches to change thecontact operation test concentration value.

(Test concentration
value is changed to
50ppm)

NOTE

Increase and degrease concentration value with the UP and DOWN
Switches. Keep pressing the switch to change value continuously.

4) Press the Maintenance Switch for 3 seconds. (Beep, bleep)
The contact operation test will be performed.
- 18 -

5) Press the Reset Switch (beep) to release the contact
operation test and the current contact operation test
concentration will be displayed.
(Press and hold the Reset Switch to return to normal mode
without stopping test operation.)(Test concentrationis set to 50ppm)

6) To change the set value, repeat the procedure from 3) to 5).
7) Press the Reset Switch for 5 seconds to return to normal mode.

7-4-6. History Confirmation [Mode Number 5]▪ Latest 10 histories will be displayed (automatically updated).
▪ The alarm history is displayed in order of alarm peak value (ppm), year/month/day/time of the startand end of alarm.
▪ Press the Reset Switch to return.
1) In user mode, press the UP Switch (beep) to
select “Mode Number 5”.
“AL H” and “5” (mode number) will be displayedalternately.
2) Press the Maintenance Switch (beep). The latest
history number “H1” will be displayed. If there is no
history, “INIT” will be displayed.
3) Press the UP Switch (beep) and select the history
number from H1 to H10.

NOTE

(No history)(History No. “H1”)▪ Each time the UP Switch is pressed, the display will switch in order of H1,
H2 … H10, INIT.
▪ To delete the history, select “INIT” and press the Maintenance Switch for 3
seconds. (pi, beep, pi, pi)

4) Press the Maintenance Switch (beep) to display
the history mark, “AL” and “the peak value ppm of
the selected number” alternately.
History mark(The peak value is 64ppm)- 19 -

5) Each time the DOWN Switch is pressed, the display will switch in order of year, month/day,and time of the start and end of alarm.

(Start)(Year)(End)(Year)(Start)(Month, Date)(End)(Month, Date)(Start)(Time)(End)(Time)

6) Press the Reset Switch (beep) and the history
number “H *” will be displayed.
To indicate the other history, repeat the procedurefrom 3) to 5).
* To delete the alarm history, select “INIT” inprocedure 3) and press the Maintenance Switch
for 3 seconds. (Pi, beep, pi, pi)<Deleted>(History number is H1)

7-4-7. Clock Setting [Mode Number 6]
Clock function is used for recording the history.
1) In user mode, press the UP Switch (beep) to
select "Mode Number 6”.
“DATE” and “6” (mode number) will be displayedalternately.
2) Press the Maintenance Switch (beep). “YEAR”
and “ * * * * (year)“ will be displayed alternately.
3) Select the item to change with the UP Switch. The
item and the current set value will be displayed.
NOTE

Each time the UP Switch is pressed, the display will switch in order of “YEAR”,“MON” (month), “DAY”, “HOUR” and “MIN” (minute).

<< When Select “YEAR” >>4) Press the Maintenance Switch (beep).
The current setting year will be displayed.

- 20 -(Year setting is 2013)

5) Change the setting with the UP and DOWN
Switches.

6) Press the Maintenance Switch for 3 seconds.
(Pi, beep, pi, pi)“YEAR” and setting year will be displayedalternately.
7) To change the other items, repeat procedure from
3) to 6).
8) Press the Reset Switch for 5 seconds (pi, beep) toreturn to normal mode.

- 21 -(Change to 2014 from 2013)(set to 2014)

7-5. Maker ModeWARNING▪
▪
▪

A wrong setting may change specifications of the CO Sensor Device. Never operate
other than the described in this instruction manual.
The administrator should change the setting with responsibility.
The CO Sensor Device does not work in maker mode. After the maker mode operation,
make sure to turn off the power once, and restart in normal mode before use.

7-5-1. Shift to Maker Mode
When the power is OFF, keep pressing the UP and DOWN Switches and press the Power
Switch for 3 seconds at the same time (beep, beep).
The following will be displayed and “775” will flash. <Shift to Maker Mode>

Software Version Number(Ex. Version No. 1.00)

All segments of LCD
turn on

Password “775” flashes.
<Shift to Maker Mode>

Maintenance
SwitchMain Power Switch- 22 -

7-5-2. Initialization of Cumulative Operation TimeThe CO Sensor Device has a sensor replacement notification function (see “8-1. 5) Sensor
Module Replacement” on page 26). It needs to initialize the cumulative operation time when thesensor module is replaced.
1) Shift to Maker Mode (flashing “775”).
Make sure to read from “7-5. Maker Mode” on page 22.

2) Press the UP Switch twice to flash “777”.

Password “775” flashing

WARNING
Make sure “777” is displayed before move on to
the next step. If the setting is incorrect, thespecifications will be changed.

Password “777” flashing

3) Press the Maintenance Switch.
“4mA” will be indicated.
NOTE

To press the Maintenance Switch, use
an unpointed thin stick such as aprecision screwdriver.

4) Press the UP Switch once.
The “cumulative operation time” (hexadecimal) will
be indicated.
WARNING
Make sure the “cumulative operation time” isdisplayed before move on to the next step. If thesetting is incorrect, the specifications will bechanged.
NOTE

Each time the UP Switch is pressed,
the display switches.

Cumulative operation time- 23 -

Cumulative operation time(for 6 years)

5) Press the Maintenance Switch for 3 seconds.
The “operation time” is initialized and the cumulative
operation time will be “0”.
NOTE

If the cumulative operation time cannot
be initialized, the buzzer will sound andthe operation time will not be “0”. In thiscase, press the Maintenance Switch
while pressing the Power Switch for 3
seconds to turn OFF the power, andstart over again. If it still cannot be
initialized, contact your New Cosmos
representative for repair.

6) Press the Maintenance Switch while pressing thePower Switch for 3 seconds to turn OFF the power tocomplete setting.

- 24 -

Cumulative operation time

8. Maintenance Check▪
▪

The daily inspection should be performed by the user.
The periodic inspection should be performed regularly once a month or once a year by the user or
New Cosmos.

ATTENTION
Span adjustment of gas sensor is extremely important to ensure the reliability of the CO
Sensor Device. We highly recommend periodic sensor adjustment.

8-1. Inspection Contents and Frequency
Periodic Inspection
Daily
Monthly Every 2 Years Inspection

Start-up

Expanded/R
elocation

1) Concentration Display

VV2) Contact Test

V

V

V

3) Zero Adjustment*1

V

V

V

Inspection Contents

VV4) Span Adjustment (gas calibration)V5) Gas Sensor Replacement(6-year *2)*1: Make sure there is no gas around before performing zero adjustment.
*2: Replace a sensor after 6 years from the date of purchase. Contact your New Cosmos representative for sensor replacement.

1) Concentration Display▪ Confirm that the Carbon Monoxide concentration is displayed on LCD and the CO Sensor
Device is operating properly.
2) Contact Operation Test
▪ Refer to “7-4-5. Contact Operation Test” on page 18 and confirm the contact activates
properly.
3) Zero Adjustment▪ Check the concentration display is indicating 0ppm without any gas around.
If it is not indicating 0 ppm, refer to “7-4-3.Zero Adjustment” on page 17 and perform zeroadjustment.
4) Span Adjustment (Gas Calibration)▪ To maintain the gas sensor performance, conduct a span adjustment at least every two years.
CAUTION▪
▪

Contact your New Cosmos representative for span adjustment (fee-based).
It cannot detect properly if the adjustment is wrong.

- 25 -

5) Gas Sensor Replacement▪ The recommended replacement cycle is 6 years under the normal use condition. However, if
any abnormality, such as the significantly decrease of sensor sensitivity, is confirmed by aperiodic inspection, it needs to be replaced.
NOTE▪ Even if it is not in use for a long period of time, replace a sensor within 6 years
from the date of purchase. Contact your New Cosmos representative forsensor replacement (fee-based).
▪ This device counts every one hour when the power is on. As the cumulative
time reaches six years, “Sensor Replacement” will be displayed on LCD.

8-2. Clock Battery Replacement
CAUTION ▪ Make sure to use “CR2032 lithium battery” for clock battery.

1. Press the Maintenance Switch while pressing the Power Switch for 3 seconds to turn OFF
the power.
2. Open the Screw Cover.
3. Loosen the cover fixation screw. ** The screw does not come off.
2
3
4. Pull the cover forward lightly.
41

5. Hold the A part, and slide up to the B position. **Align the center of the A part with B position.
6. Turn OFF the main power.
CAUTION
Make sure to turn OFF the power toavoid electric shock.

5

6

O
N
B position

OFF

A part- 26 -

7. Hold the C part (both sides), and pull forward to detach from case.
CAUTION

Cover and case are connected by an electric cable.

Cover
Case

CAUTION
7. Pull

The electric cable connected
to a case is behind a cover.

C partBe careful not to disconnect.

8. Place a cover at the top portion of case. (Fit the E part of cover into the D part of case.)

Upper part of case

E partUpper part of cover

D partInserted

8. Fit in
Clock Battery
9. Replace with a
new battery.

- 27 -

9. Replace with a new clock battery.
CAUTION

Observe proper polarity when installing battery.

10. Pull up the C part of cover from the case (reverse procedure of 8), and fit the A part of cover into
the B position of case (refer to procedure 5).
11. Turn ON the main power.
12. Slide the A part of cover down to the bottom (reverse procedure of 5).
13. Press the cover to open the screw cover, and tighten the cover fixation screws.
CAUTION

Make sure to tighten the cover fixation screw after the cover is attached,as it may not be able to detect properly.

14. Close the Screw Cover.

- 28 -

9. Troubleshooting
Before requesting repairs, please check the following items.
Symptom

Cause

Solution

Either of the Main Power

Turn ON the Main

Switch or Power Switch isPower Switch or PowerOFF

Switch7-2. Operating
Procedure (page 13)

Check the connection

Nothing is displayed
on LCD

Reference

Loose connection

and recconect

6. Wiring (page 9)

terminals
Provide a power supply

Maintenance Function is left

Switch OFF the

MaintenanceON

Maintenance Function

Function ON and

Maintenance icon is on
LCD, and theconcentration valueand “_ _ _ _” are7-1. Before Use

The power is not supplied(page 13)
7-4-2. Switching theOFF (page 17)

displaying alternately

7-4-2. Switching theMaintenance Function is left

Switch OFF the

MaintenanceON

Maintenance Function

Function ON and
OFF (page 17

Contact output does
not operate

Check the wiring andIncomplete connection

reconnect terminals

6. Wiring (page 9)

Contact operation set value

Check the contact

7-3-3. Full Scale andis incorrect

operation set value

Set Value (page 16)

Notifying the gas sensor
Sensor replacement
icon is on LCD

replacement timing since thetotal cumulative time thatpower has been applied

Ask for a gas sensor
replacement

8-1. 5) Gas Sensor
Replacement (page26)

reaches 6 years.
Press the Maintenance
Switch while pressing
the Power Switch for 3▪ “E-E1”, “E-E2” or“E-E3” is displayed

seconds to turn OFF

on LCDturn ON again after a▪ Malfunction contact is
activated

the power, and thenInternal Error

few minutes.

▪ Analog output is lessthan 0.9mA

If it still does not work
properly, contact your
New Cosmos
representative forrepair.

- 29 -

7-2. Operating
Procedure (page 13)

Symptom

Cause

Solution

Reference

If “E-S3” is displayed
within one week from▪ “E-S1” or “E-S3” isdisplayed on LCD▪ Analog output is lessthan 0.9mA

the installation and it
Sensor Error

recovers within one

2. Precautions (pagehour, it will be able to2)

operate normally.
Otherwise, request for
repair.
Turn OFF the power,
and then turn ON aftera few minutes.

Troubles other than

Possibility of microcomputer

If it still does not work

7-2. Operating

the above symptoms

malfunction due to noise.

properly, contact yourProcedure (page 13)

New Cosmos
representative forrepair.

- 30 -

10. Specifications
Detection Principle
Sampling Method
Target Gas
Detection Range
Gas Concentration Display
Operation Set Value
Accuracy*1External Output

Explosion-proof
Other Functions
Applicable Cable
Cable Length
Operating Temperature/
Humidity Range
Power Source
Power Consumption
Dimensions
WeightMounting Method
Body Color

Electrochemical Cell
Diffusion Type
Carbon Monoxide
0 to 75ppm(Service range: Full Scale to 1000ppm)
4-digit digital LCD, solution 1ppm (with backlight)
ON: 25ppm
OFF: 10ppm
Within +/- 50% of operation set value▪ Contact Output
Operation contact: 1a non-voltage contact x 2 (non-latching)
Malfunction contact: 1a non-voltage contact(Rated load: 125V AC 0.5A, 30V DC 2A, resistance load)*2▪ Gas concentration analog output : 4-20mA DC (in common
with the negative of power source)(The current sensing resistor must be less than 300 ohms
including interconnection resistance)
Non-explosion-proof
Maintenance function (deactivate contact output)
2
Shielded cable for control (0.5 to 1.25mm , less than 10.5mm inoutside diameter)
Within 500mm-5 to +40 degrees C (without rapid temperature change)
30 to 85%RH (non condensing)
24V DC +/-10%
24V DC: 1W at monitoring, 2W during operation
82 (W) x 150 (H) x 35 (D) mm (excluding protrusions)
Approx. 300g
Wall mount type (indoor)
DIC546 1/2*1: Under the same measurement condition.
*2: Output of concentration in detection range.

- 31 -

11. Warranty
New Cosmos Electric Company Limited (New Cosmos) offers the following as the sole and exclusive
limited warranty available to the customer.
This warranty is in lieu of, and customer waives, all other warranties of any kind or nature, expressedor implied, including without limitation, any warranty for merchantability or fitness for a particularpurpose. The remedies set forth herein are exclusive.
New Cosmos warrants to the original purchaser and no other person or entity (the customer) that thegas detection product supplied by New Cosmos shall be free from defects in materials andworkmanship for a period of one (1) year from the date of purchase. This warranty does not include
consumables, such as fuses, filters, etc. Certain other accessories not specifically listed here may
have different warranty periods.
After examination of an allegedly defective product returned to New Cosmos, with freight prepaid,should the product fail to conform to this warranty, the customer’s only remedy and New Cosmos’s
only obligation shall be, at New Cosmos’s sole option, replacement or repair of such non-conforming
product or refund of the original purchase price of the non-conforming product. In no event will New
Cosmos be liable for any other special, incidental or consequential damages or losses of any kindwhatsoever, including but not limited to, loss of anticipated profits and any other loss caused by reasonof non-operation of the product.
This warranty is valid only if the product is maintained and used in accordance with New Cosmos’s
instructions and/or recommendations. New Cosmos shall be released from all obligations under thiswarranty in the event repairs or modifications are made by persons other than its own or authorized
service personnel or if the warranty claim results from physical abuse or misuse of the product.

- 32 -

12. Detection Principle▪

Electrochemical Cell
Clean Air

Carbon Monoxide Exists

Detection Pole (Pt)
Ion Conductor(Solid or liquid
phase)

Dielectric through OH-

Reference Pole (Pt)

Sensor Element Configuration and Electrode Equation
Sensor is made up of noble metal catalyzed detection pole, reference pole and ion conductor.
When the CO exists, the reaction of equation (1) with water vapor in the air on catalyst will occur.
CO + 2OH--->

CO2 + H2O + 2e-

(1)

When connecting a detection pole electrically to a reaction pole, ion (OH-) will be generated at
detection pole, and reach the reference pole through the ion conductor. Electrons will be also
generated at the same time and reach the reference pole through the external electric lead, and areaction of equation (2) with oxygen in the air will occur at a reference pole.
-(1/2) O2 + H2O + 2e

-->

2OH

-

(2)

Therefore, this gas sensor can be regarded as a battery of gas active material which is made up of
the full cell reaction indicated in equation (3) which is composed of equation (1) and (2).
CO2 + (1/2) O2

-->

CO2

(3)

For using this as a gas sensor, connect a detection pole to a reference pole electrically and measure
the short-circuit current.

- 33 -

13. Glossary
Gas Detector:

A unit that detects gas concentration and converts it to electric signals.

Diffusion Type:

A method that detects gas by utilizing gas convection and diffusion.

Target Gas:

A gas that is indicated and sets off an alarm when detected.

Detection Range:

Range of gas concentration that can be indicated and set off an alarm.

Service Range:

Range to indicate the value of outside the detection range as a guideline.

Operation Set Value:

A preset value for the contact operation when gas concentration reaches acertain level.

Accuracy:

Difference between the preset operation set value and gas concentration
when it activates the contact or as the percentage of the difference comparedto the operation set value.

OperatingTemperature Range:

Range of temperatures where the equipment can perform its functions.

Maintenance andinspections:

Work that guarantees the equipment will perform its required functions.

- 34 -

- 35 -

- 36 -

- 37 -

Manual Revision History
Edition No.
GAE-121-00

Date

RevisionsNovember 20160

Head Office
New Cosmos Electric Co., Ltd.
2-5-4 Mitsuya-naka Yodogawa-ku
Osaka 532-0036, Japan
Phone 81-6-6309-1505
Fax 81-6-6308-0371
Tokyo Branch
New Cosmos Electric Co., Ltd.
2-6-2, Hamamatsu-cho, Minato-ku
Tokyo 105-0013 Japan
Phone 81-3-5403-2715
Fax 81-3-5403-2710
Email e-info@new-cosmos.co.jp
URL : https://www.newcosmos-global.com