Diffusion type Gas Detector
Model KD-12B(SIL2 Capable)
Instruction Manual Keep this instruction manual where it is readily accessible.
 Thoroughly read this instruction manual before using the equipment so it can be usedsafely and correctly.
 This manual provides information concerning standard specifications. If the specificationsof your model are nonstandard, refer to the delivery specifications.

New Cosmos Electric Co., Ltd.
Instruction Manual No.
GAE-054-08
September 2022

 Nomenclature Replacement of Sensor Unit

See pages 4 to 6.

See pages 31 and 32.

 Wiring and Connecting
Methods

 Display and Operation in
Each ModeSee pages 14 to 16.

See page 19.

24 V
power
supplyIndicator

ShieldE.g., External
alarm

Ground terminals

 Maintenance Check andOperation Methods
See pages 22 to 30.

 Troubleshooting
See page 33.

Table of Contents
1.

Introduction .................................................................................................................... 1

2.

Precautions.................................................................................................................... 23.

Contents of Package ...................................................................................................... 3

4.

External Dimensions and Nomenclature....................................................................... 4
4-1.

Main Unit .................................................................................................................. 4

4-2.

Display and Control Blocks ...................................................................................... 5

4-3.

Terminal Block .......................................................................................................... 6

5.

Installation ..................................................................................................................... 7
5-1.

Installation Method ................................................................................................... 7

5-2.

Examples of Installation Positions .......................................................................... 11

5-3.

Mounting of Optional items .................................................................................... 12

6.

Wiring Method ............................................................................................................. 13
6-1.

Wiring Work............................................................................................................ 13

6-2.

Wiring and Connection........................................................................................... 14

7.

Precautions before Use ............................................................................................... 17
 In Case of Gas Leakage .................................................................................................. 17

8.

Display at Start-up (Initial Delay) ................................................................................. 18

9.

Display and Operation in Each Mode .......................................................................... 19

10.

Trouble Alarm .............................................................................................................. 20

11.

Maintenance Check and Operation Method ............................................................... 2211-1. Daily Inspection and Periodical Inspection ............................................................ 22
11-2. Preparing Calibration Gas ..................................................................................... 23
11-3. Calibration Method ................................................................................................. 25
 Maintenance Mode ........................................................................................................... 25
 Zero Adjustment ............................................................................................................... 26
 Span Rough Adjustment................................................................................................... 28
 Full-scale and Alarm Set Value Display ........................................................................... 29
 Test Mode ......................................................................................................................... 30

11-4. Replacement of Sensor Unit .................................................................................. 31
12.

Troubleshooting ........................................................................................................... 33

13.

Specifications............................................................................................................... 34

14. Markings of explosion-proof ........................................................................................ 35
15. Warranty....................................................................................................................... 36
16. Life Expectancy............................................................................................................ 37
17. Detection Principle ....................................................................................................... 37
18. Glossary ....................................................................................................................... 38

1. Introduction
 Thank you for purchasing the KD-12B (SIL Capable) Diffusion type Gas Detector.
 In order to ensure the correct and safe operation of this product, be sure to read this manualand the safety manual before use.
 This product detects various types of gas including combustible gas. The product detects gas
leakage at an early stage in industrial facilities (e.g., gas production plants and depots,
chemical plants, paint factories, and power plants), and outputs the gas concentration value inanalog signal form while displaying the gas concentration value.
If the gas concentration reaches a preset alarm level, the red ALARM indicator will flash andturn ON an external contact output, thus helping to prevent disasters such as explosion
accidents and fires.
 Maintenance and inspection are indispensable to the reliable performance of the Gas
Detection/Alarm System. Be sure to perform the maintenance checks described in thismanual.

 Unless the inspection, maintenance, calibration and proof test are done on the gas detector
every six months or once every year, the gas detector are not suitable for use in SIL2
safety-related applications.
 In order to ensure the correct and safe operation of this product in safety related system, besure to read the safety manual before use.

Explanation of Symbols
The following symbols are used to indicate and classify precautions in this manual.

DANGER

Indicates information that, if not heeded, is likely to result in death orserious injury.

WARNING

Indicates information that, if not heeded, could possibly result in death orserious injury.

CAUTION

Indicates information that, if not heeded, could result in minor injury, or
damage to the product.

MEMO

Indicates advice on handling the product.

12. Precautions
 Read this manual completely and be sure you understand the information provided herein
before attempting to use the product.
 Abide by all applicable laws and regulations when using this product.

WARNING Be sure to ground the product to prevent electric shocks.
 If there is a gas leak alarm, take the necessary measures in accordance with yourcompany's regulations.
 The cable entry device and blanking elements shall be of ATEX/UKEx/IECEx certified in
type of explosion protection flameproof enclosure ‘’db’’, suitable for the condition of use
and correctly installed.
 Unused apertures shall be closed with suitable ATEX/UKEx/IECEx certified blanking
elements.
 Fastener type M5 x 16 shall have a yield stress factor of min. 450 N/mm2.

CAUTION All necessary work for the product including wiring and installation should be carried out
by suitably trained personnel in accordance with applicable code of practice.
 Inspection, maintenance and repair of the equipment should be carried out by suitablytrained personnel in accordance with applicable code of practice.
 Do not disassemble the product or modify the construction or electric circuits of the
product. Otherwise, the explosion-proof construction of the product may be adversely
affected.
 Do not install the product in places or near places where silicone sealant or gas is used.
Otherwise, the performance of the product may be adversely affected.
 Be sure to provide a protective cover (optional) if the product is installed outdoors.
 Use the product in accordance with applicable laws and regulations.
 Hydrocarbon gas except the target gas might be detected, so consider the measurement
environment.

Special Condition for Safe Use If used in an ATEX hazardous area, an ATEX-certified cable gland must be usedaccording to EN IEC 60079-0:2018 and EN 60079-1:2014. (Not included)
 If used in an UKEx hazardous area, it must be used a suitably certified cable gland for
UKEx requirements. (Not included)
 If used in an IECEx hazardous area, an IECEx-certified cable gland must be usedaccording to IEC 60079-0:2017 Edition 7.0 and IEC 60079-1:2014 Edition 7.0. (Notincluded) Fasteners (M5x16 hexagonal head screws) shall have yield stress of at least 450 N/mm2.
 Cable entry requirements for cable gland:
Thread size………………………… G3/4 or PF3/4
Minimum depth of engagement …. 10.86mm
Minimum thread engagement…….. 6 threads
 The dimensions of a flameproof joint between the case and the case cover of the KD-12
flameproof housing must meet the minimum requirements specified in EN/IEC60079-1.
Please contact the manufacturer for inspection, repair or adjustment of the flameproof
joint.
2

3.

Contents of Package

 The product is provided with the following items. Make sure that none of these items is
missing.
 Although the product is packed and shipped with the utmost care, contact your New Cosmos
representative if there should be any damage or missing items.
Accessories

Optional items

Detector head
Accessory set
Two M5 screws: 2 pcs
M4 x 4 hexagon socket head screw:1pc
Hexagon wrench (nominal dia. 4): Stick: 1 pc
Instruction Manual (see note 1)
Safety Manual (see note 1)
MJ-1 Magnetic Stick: 1 pc

Protective cover (see note 2)
Horizontal type: KW-41A
Vertical type: KW-42A
PB-1 2B Pole Mounting Bracket (see note 2)
SK-1 Sensor Replacement Jig (see note 2)
GCP-09 Calibration Cap (see note 2)
Z-001K Gas Calibration Kit
2 bulb hand pump
Capillary for 2 bulb hand pumpNote: 1. Instruction Manual and Safety Manual are provided for each order.
2. The optional items are for use only by the KD-12.

WARNING Do not use the magnetic stick for any purposes other than the operation of this product.
 Keep in mind that when the magnetic stick attracts magnetic objects, tools, iron pieces,
etc., your hands may become pinched and injured.
 Do not touch the magnet if you are allergic to metal, otherwise your skin may becomechapped or reddened.
 Generally speaking, magnets break easily and the corrosion of the magnet progresses
from the fracture location. Fragments of the magnet may also get in your eyes or injure
your skin.
 The components of the magnetic stick may melt into water. Do not drink water exposed tothe magnetic stick.
 Keep the magnetic stick away from electronic medical devices, such as cardiac
pacemakers, or the magnetic stick may obstruct the normal operation of the device.

CAUTION Keep the magnetic stick away from magnetic tapes, floppy disks, and prepaid cards.
Otherwise, they may become magnetized and the information that they hold may be lost.
 Keep the magnetic stick away from high-precision devices, such as personal computers
and watches. Otherwise, they may malfunction.

34. External Dimensions and Nomenclature
4-1.

Main Unit(Dimensions are in mm)

Item

Component

Description/Function(1)

Case cover

---

(2)

Case

---

(3)

Sensor unit

Incorporates a built-in gas sensor.

(4)

Sensor guard

Protects the sensor unit.

(5)

Earth terminal (external)

Used for grounding the frame.

(6)

Status lights (3 places)(7)

Magnetic switches(4 places)(8)

Display(9)

Cable entry

(10)
(11)

M4x4 Hexagonal set
screw (2 places)
M5x16 Hexagonal headscrews (4 places)

Indicate the status of the unit:
power (green), alarm (red), and fault (yellow)
Insert the magnetic stick into each magnetic switch
opening to operate.
Displays the gas concentration, parameter value andstatus message.
Thread size: G3/4 or PF3/4. Pitch=1.81mm.
Depth of engagement: 10.86mm.
Minimum engaged threads: 6 threads.
Applicable cable gland*1 must be provided by end user.
To secure the cable gland (cable fitting) and the sensor
unit. Use 2mm hex key wrench (not included).
To secure the case cover.
Use 4mm hex key wrench (included).

*1: Cable gland should be ATEX/UKEx-certified according to EN IEC 60079-0:2018 for use in an
ATEX/UKEx hazardous area, and EN 60079-1:2014, and IECEx-certified according to IEC
60079-0:2017 Edition 7.0 and IEC 60079-1:2014 Edition 7.0 for use in an IECEx hazardous area.

4

4-2.

Display and Control Blocks

Magnetic Switches
Use the magnetic stick (MJ-1) to operate the magnetic switches.
Item

Component

Description/Function(1)[MODE] switch

Changes the operation mode or cancels the current
operation.

(2)[ENTER] switch

Confirms a setting or executes an operation.

(3)[UP] switch

Increases the parameter value.

(4)[DOWN] switch

Decreases the parameter value.

Item
(5)

Component

Description/Function
Displays gas concentration, parameter value and status
message.

Display

Status Lights
Item

Component

Description/Function(6)[POWER] light (green)

When lit, the unit is on.

(7)[ALARM] light (red)When lit, alarm notification.

(8)[TROUBLE] light (yellow)

When lit, fault (device error) detected.

5

4-3.

Terminal Block

Terminal block

2424V(+)
V (+)

1

GND

2

Signal 3
ZA

4

ZC

5

POWER －
4 to
20 mA
4～20mA＋E

Groundterminal

Clamp

Lever

1
2
3
4
5
Sensorconnector

O-ringNumber
1

Name

Description

24 V (+)

Power supply voltage (positive)

GND

Power supply voltage(-) and analog signal(negative) common

3

Signal4- to 20-mA(+) analog signal

4

ZA

5

ZC

2

External contact
Ground terminal

Used to ground the frame.

65. Installation
5-1.

Installation Method

WARNING The cable entry device and blanking elements shall be of ATEX/UKEx/IECEx
certified in type of explosion protection flameproof enclosure ‘’db’’, suitable for thecondition of use and correctly installed.
 If used in an ATEX hazardous area, an ATEX-certified cable gland must be usedaccording to EN IEC 60079-0:2018 and EN 60079-1:2014. (Not included)
 If used in an UKEx hazardous area, it must be used a suitably certified cable glandfor UKEx requirements. (Not included)
 If used in an IECEx hazardous area, an IECEx-certified cable gland must be usedaccording to IEC 60079-0:2017 Edition 7.0 and IEC 60079-1:2014 Edition 7.0. (Notincluded) Unused apertures shall be closed with suitable ATEX/UKEx/IECEx certified
blanking elements.
 Fastener type M5 x 16 shall have a yield stress factor of min. 450 N/mm2.
 The dimensions of flameproof joint between casing and casing cover of KD-12
flameproof housing are exceeding the minimum requirements stated
EN/IEC60079-1. Please contact the manufacturer for inspection, repair and/or
adjustments of this flameproof.
 Cable entry requirements for cable gland and sensor:- Cable gland- Sensor

Thread size: G3/4 or PF3/4

Thread size: M27

Pitch: 1.81mm

Pitch: 1.5mm

Min. depth of engagement: 10.86mm

Min. depth of engagement: 8.25mm

Min. thread engagement: 6 threads

Min. thread engagement: 5.5 threads

 Securely tighten the hexagonal set screws to ensure that no movement of the
Hexagonal set screws (2 places)
cable gland is possible.
Screw Specifications
Size: M4x4
Screw length for securing cable gland: 3, 4, 5 or 6 mm
Screw length for securing sensor unit: 3 or 4 mmMaterial: Stainless steel

Note: The head of each screw shall be flush with the surface of the fitting.

7

CAUTION
 Be careful not to damage the gas detector when installing it. Otherwise, theexplosion-proof performance of the gas detector will be lost.
 Do not install the product in the following places.
- Places where the ambient temperature exceeds the operating temperature
range (10C to 50C).
- Places where condensation occurs.
- Places where water is directly sprayed.
- Places subject to corrosive gas.
- Places close to equipment that generates high frequencies or a magnetic field.
- Places where silicone sealant is used or likely to be used.
- Places where silicone gas is used or likely to be used.
 Install the gas detector in places where it can be maintained and inspected withease.
 Install the gas detector in places free from vibration.
 Install the gas detector in places free from sudden temperature changes.
 Keep the gas detector free from impacts.
 When installing the gas detector outdoors, be sure to install the protective cover(optional).
 The installing height of the gas detector has an important relation to the specificgravity of the target gas to be detected. Install the gas detector in accordancewith required regulations.
 Install the gas detector in the environment where there is no power outrage
including short interruption

 Installing Height
Type of gas
Gas heavier than air(Example: LPG)
Gas almost the same as
air in specific gravity(Example: Carbon
monoxide)
Gas lighter than air(Example: City gas andhydrogen)

Installing height
A maximum of 10 cm above thefloor.
(Height to the sensor guard tip)

Remarks
Keep a space of approximately
7 cm from the sensor guard tip
for ease of maintenance andinspection.

75 to 150 cm above the floor.
(Height to the sensor guard tip)

Decide the height by considering
the specific gravity and mounting
environment.

Near the ceiling

Decide the height by consideringarrangements for ease ofmaintenance (e.g., a scaffold).

8 Mount the main unit to the wall with the M5 screws that are provided with the product. Be sure
to install the protective cover (optional) when mounting the main unit outdoors. Mount the main
unit with a 2B pole mounting bracket (optional) when mounting the main unit to a 2B pole.
Refer to 5-3 Mounting of Options for details of optional products.

(Dimensions are in mm)

 The casing cover of the gas detector needs be opened at the time of wiring. Therefore,
when installing the gas detector, provide sufficient space to enable the casing cover to beopened to at least 90°.

(Dimensions are in mm)

9
It is necessary to operate the detector during inspection or maintenance work.
Therefore, leave a distance of 50cm or more between the front side of the detector and theobject in front of it when installing it.

Leave a distance of min. 50cm.

・ When installing this diffusion type gas detector on the ceiling or a higher location, make sure toleave enough space just below the detector to allow for inspection or maintenance activities.
When installing the detector at a height more than 3m from the floor, we recommend you to
use a suction type gas detector with a sampling tube up to the ceiling.

Leave space below the gas
detector for inspection or
maintenance purposes.

 A sensor guard is not necessary when installing the detector on the ceiling or a higher location.
However, when installing the detector on a lower place like the floor, a sensor guard is requiredin order to protect the sensor from water splash.
 Consider the direction of the gas flow and the hole of the sensor guard when installing.
Install the sensor guard so thatthe gas flows through the hole.

Gas flow

10

5-2.

Examples of Installation Positions

 Install the product in places where gas easily accumulates.

Places where gas easily accumulates.
Gas detector
Roof fan(Exhaust port)

Entrance(Suction port)

Entrances and windows(Suction and exhaust ports)

Gas detector
mounting
position

Plan view

Side view
Example of Installation Position

Partition
wall

Pipe
Valve

Detector

FlangeExample of Outdoor Installation Position

11

5-3.

Mounting of Optional items

Protective Cover
(190)

(90)

(90)

(190)
M3 screw(1 place)M3 screw(1 place)
(190)

(190)

(Dimensions are in mm)

Horizontal Type (KW-41A)

Vertical Type (KW-42A)

CAUTION Secure the casing cover with M3 screws if strong winds are expected.

 2B Pole Mounting Bracket(Dimensions are in mm)

126. Wiring Method
6-1.

Wiring Work Be sure to provide explosion-proof wiring if the product is to be used in hazardous places.

WARNING The cable entry device and blanking elements shall be of ATEX/UKEx/IECEx certified in
type of explosion protection flameproof enclosure ‘’db’’, suitable for the condition of use
and correctly installed.
 Unused apertures shall be closed with suitable ATEX/UKEx/IECEx certified blanking
elements.

CAUTION All necessary work for the product including wiring and installation should be carried out
by suitably trained personnel in accordance with applicable code of practice.
 Inspection, maintenance and repair of the equipment should be carried out by suitablytrained personnel in accordance with applicable code of practice.

Cable Work
 Use a shielded cable, such as CVV-S with a thickness of 1.25 to 2.00 mm2. Lay all cables inprotective tubes, such as metal conduits or carbon steel pipes, or other protective structure,such as a concrete duct.
 When using the external contact function of the product, which requires a five-conductor cable,
make sure that the maximum diameter of the cable conductor is 1.25 mm2. When using only
the analog signal function, which requires a three-conductor cable, without the external
contact function, make sure that the maximum diameter of the cable conductor is 2.00 mm2.

13

6-2.

Wiring and Connection

WARNING Before opening the case cover of the gas detector, be sure to eliminate possible sourceof ignition. Disconnect the power supply to the detector and all devices connected to it(e.g. indicator unit and signal converter).
 Be sure to ground the product to prevent electric shocks.

 Use a conductor with a cross-sectional area of at least 4mm2 for external grounding.
 Place a plain flat washer between the case and the terminal.

CAUTION

Connect wires to their corresponding terminals.



Keep the connection cable (power and signal lines from the detector) away from otherpower lines.



Wire a current loop between Signal and Ground. If the wiring is open, normal gas
detection is impossible because a trouble alarm will be triggered.

When closing the case cover, make sure that it does not catch on the gasket or any
loose cables and that the cables are not overly stressed.

Connecting Power Supply and Signal Wires Provide dedicated breakers, if needed, to lines that are connected to peripheral devices, suchas indicator units and signal converters.
 Use a dedicated cable, such as CVV-S (with a thickness of 1.25 to 2.00 mm2).
 Make sure that the power supplied to the product is within the specified voltage range.
 Make sure that the load resistance of the signal line, including the resistance of the wire, is 300
ohm or less.

14

MEMO

 If the main unit is grounded on the power supply side, do not connect a shielded cable to theground terminal (E) in the gas detector, or otherwise two-point grounding will result.

Connection Example with Power Supply Side Grounded
24V

電源
power
supply2
4V

CVVS cable

指示計
Indicator
ユニット

External alarm

ShieldNot grounded

Groundterminals

Ground terminal on
power supply side
Grounded

System Configuration Example
Controller

Gas

KD-12B
SIL
Sensor Subsystem

4-20 mA

PLC

Valves

Logic Subsystem

Actuator Subsystem

 For details, refer to the Instruction Manual of each device.

15

Typical Connection Procedure(1)

Prepare a power supply that can provide 24 V.
(Do not turn on the power supply before wiring the main unit.)(2)

Loosen the hexagon socket bolts on the four corners of the main unit using the provided
hexagon wrench with a nominal diameter of 4 mm, and open the casing cover of the main
unit.

(3)

Press the lever of the terminal block with a flat-blade screwdriver.

(4)

The clamp will open. Insert the lead wire.

(5)

Connect the positive side of the power supply to the 24 V+ terminal.

(6)

Connect the negative side of the power supply to the GND terminal.

(7)

The lead wire will be automatically secured when the screwdriver is lifted.

(8)

Check that the power supply cords are securely connected to the terminals. This
completes the power supply preparations.

(9)

Wire the analog signal and external contact terminals, if required.

(10) Tighten the hexagon socket bolts (tightening torque : 0.8 – 2.4 N・m) on the four corners ofthe main unit and close the casing cover of the main unit.

CAUTION When lowering the lever of the terminal block, be careful not to allow the flat-blade
screwdriver to slip off of the lever. Otherwise, the flat-blade screwdriver may damage theharness or circuit board.
 When closing the casing cover, make sure that the power supply cord, harness, andO-ring are not caught by the casing cover.

16

7. Precautions before Use

CAUTION Before turning ON any of the devices (e.g., indicator unit, signal converter) connected tothe product, recheck that all of the connections are correct. Make sure that the gas
detector and indicator unit or signal converter, in particular, are connected properly.

 In Case of Gas Leakage

DANGER Without panicking, check that there is no fire around the product. Do not touch any
electric switches under any conditions. Sparks from turning electric switches ON or OFF
may cause ignition.

WARNING If there is a gas leak alarm, take the necessary measures specified by your company.
 If a gas leak occurs indoors, open the windows and doors to ventilate the room.
 Check the gas leakage location and promptly take the necessary measures.
Measure the gas concentration with a portable gas detector and confirm the safety
before entering the detection site.

17

8. Display at Start-up (Initial Delay)

CAUTION Check that there is no gas around the product before starting the product.
 If the sensor output is not stable, the external contact point may operate after the initialdelay. Release the interlock of the external equipment if necessary.
 During the initial delay, the analog signal fixed at 1.6 mA will be output and the external
contact will not operate.

MEMO

 The magnetic stick is not operable during the initial delay.
 The initial delay lasts approximately 30 seconds after the power is turned ON.

(1)

When the power supply is turned ON, all of the indicator lamps (green, red, and yellow
lamps) and the display block are lit.

(2)

While the indicator lamps (green, red, and yellow lamps) are lit, the following items will be
lit for approximately 1 second each.
Software version number (of the main unit)
Full scale
Example [] ppm
When the full-scale value is 2000 ppm.
Alarm set value
Example [] ppm
When the alarm set value is 500 ppm.

(3)

Then the POWER indicator (green lamp) will be flashed for approximately 25 seconds.

(4)

When the POWER indicator (green lamp) is lit, the start-up of the main unit is completed
and the main unit will be in gas monitor mode.

MEMO If the sensor unit has not been turned ON for a long time after the product is shipped fromfactory, it may take some time for the sensor output to stabilize.
 If needed, turn ON the product for approximately one week, and make the zero adjustment
and span adjustment. Refer to 11.3 Calibration Method for the adjustments.

18

9. Display and Operation in Each Mode
In excess of alarm set value
At start-up(Initial delay)
Green lamp
flashes

Maintenance mode

Gas monitor
mode

Green
lamp is
ON

Red
lamp
flashes

Test mode

Gas monitor
mode

Red lamp
Green flashes
lamp isON

Test mode
Red lamp
flashes

Green lamp
is ON

Contents
of display
The valueaccording to gas
concentration isdisplayed.
The value
gradually
approaches
zero.

[
Gas
concentration isdisplayed.

]

[

]

[Set
concentration]
A full-scale testfrom 10% to110% is possible.

[Gas
concentration]

Displayedalternately[Test value]

Displayedalternately

Value
corresponding

Analogsignal4 to 20 mA

Fixed at 1.6 mA

Gas
concentration
value is output.

Test value is
outputContact
operation

Does notoperate (OFF).
(SHORT)

Operates (ON).
(OPEN)

Operates (ON).
(OPEN)

19

to the gas
concentrationor fixed value(1.6 mA) is
outputaccording touser choice.

Does notoperate(OFF).
(SHORT)

Test value or
fixed value(1.6 mA) is
outputaccording touser choice.

Does notoperate(OFF).
(SHORT)10. Trouble Alarm
 The product has a self-inspection function, and the trouble alarm will operate if a problem
occurs.
 The product will inform the user of the problem details with the display shown in the following
table when the trouble alarm operates.
 When the trouble alarm is generated, the analog signal will be approximately 0.9 mA or below.
Screendisplay

Troubleindicator

Problemdetails

Probable cause

RemedyYellow lamp
flashes

Power supply
voltage droperror

The power supply voltage
is low.

Check the power supply
voltage.

Yellow lamp
flashesSensor error

The sensor connector is
disconnectedorthesensor wire has broken.

Check that the sensor
connector is securely
connected.
If a sensor connector
failure or broken wire haspossiblyoccurred,contact
yourlocal
representative.

Lamp isOFF

Zero-point
adjustment
error

There is gas
ambient air.

Afterchecking
theambient air, make thezero adjustment again.

in

the

After checking the typeand concentration of gas,
make a span adjustment
again.

Lamp isOFF

Spanadjustment
error

The gas concentration
applied for adjustment iswrong.

Yellow lamp
flashesInternal circuit
error

There is an internal failure.

Contact
yourrepresentative.

local

Yellow lamp
flashesInternal circuit
error

There is an internal failure.

Contact
yourrepresentative.

local

There is a broken wire orinternal failure.

Check
the
wiringconditions
andconnections. If the wires
are found to be correctly
connected, contact yourlocal representative.

Yellow lamp
flashes

Analog output
error

20

If
the
type
and
concentration of gas issuitable,makespanrough adjustment.

Yellow lamp
flashesInternal circuit
error

There is an internal failure.

Contact
yourrepresentative.

local

Yellow lamp
flashesInternal circuit
error

There is an internal failure.

Contact
yourrepresentative.

local

Yellow lamp
flashes

Maintenancemode recovery
error

The gas detector remains
in maintenance mode.

Turn off the gas detector.
Wait a few seconds thenturn back on.

 If a screen other than the above is displayed, refer to the 12. Troubleshooting section. If the
product does not reset to normal operation after taking the measures shown in the table or if
the problem is not listed in the table, contact your local representative.
 If the product goes into any unintended mode during adjustment or setting, cease operating
the product and contact your local representative..

2111. Maintenance Check and Operation Method11-1. Daily Inspection and Periodical Inspection
 Daily inspections are conducted by the user, while periodical inspections are conducted byyour local representative.
Frequency

Checking item

At least once
per month

Visualinspection

Contents of inspection
 The status of lamp (green POWER indicator)
is lit.
 The concentration display of the gas
concentration indicator.
 Clogging of sensor unit mesh.
 Corrosion of sensor unit mesh.
 Corrosion of the main unit.
 Corrosion of mounting screw.
If a failure is found, replace the parts.
Apply inspection gas to the gas detector andcheck the operation of the alarm.
 Use the calibration cap, apply inspection gas,and check the operation of the alarm.

Daily
inspection

Minimumintervals of 2
to 3 months

Alarm operation
check with realgas

Calibration gas
Calibration cap

Conditionaround gas
detector
Periodical
inspection

At least once
per year

Check that nothing interrupts the diffusion ofgas around the gas detector.
Consult your local representative.

 Use optional products to make actual gas inspections.

Periodical Inspections
In order to maintain the reliability of the gas detection/alarm system, it is extremely important
to conduct maintenance and inspections.
Moreover, it is necessary to use actual gas (combustible gas or poisonous gas), to carefully
conduct inspection and calibration. It is highly recommended that you consider periodical
inspections under a maintenance contract with New Cosmos Electric Ltd. or your local
representative.

22

11-2. Preparing Calibration Gas
 Calibration gas is used for actual gas inspection.
 The following example shows how to prepare 0.72 vol% (40%LEL) isobutane as a referencegas.
With a standard gas cylinderStandard gas cylinder

Gasbag0.72 vol% isobutane
air balance23With no calibration gas cylinder Use the Gas Calibration Kit (optional item) and a pure gas cylinder of isobutane at 99
vol% or more, and dilute the isobutane with air to produce 0.72 vol% (40%LEL)
calibration gas.
Memo

The calibration gas can be used to check the alarm function. Check theconcentration using Gas Detector XP-3110 or a similar device before using the gas
for calibration.
●

DANGER

Make sure that there are no flammables nearby whenhandling flammable gas with a concentration over LEL (lower
explosive limit).
vinyl tube

(1) Drawing raw gas
Connect a gas bag to an isobutane 99vol% cylinder anddraw a little more than you actually need.
Bend back the hose and pinch with a pinch cock so the gas
does not leak from the bag.

pure gas cylinder(Keep it upright.)①(2) Drawing a fixed amount of raw gas
Connect a 10ml syringe to a gas bag and draw 7.2ml of raw
gas. (Draw a little more than you actually need thendischarge the excess.)gas bag with raw
gas

7.2ml of raw
gas
syringe(3) Transferring raw gas into a quantitative pumppull

Connect a syringe to the inlet of a quantitative pump thenpull out the pump’s piston. Raw gas in the syringe is sucked
into the pump. Remove the syringe and pull the piston all
the way out (100ml).

②

syringe(4) Making diluted gas
Connect an empty gasbag to the outlet of the quantitative
pump then push in the pump’s piston.

quantitativepump

Move the piston back and forth 9 times to add air in order tomake diluted gas.

③
air

Memo
If you take 7.2ml of raw gas and move the quantitativepump’s piston back and forth 10 times (a back-and-force
motion: 100ml),
7.2ml/(100ml×10)=0.0072
0.72vol% diluted gas is made.
Isobutane’s lower explosive limit (LEL) is 1.8vol%.
0.72/1.8×100=40.0
40%LEL diluted gas is made.

24

quantitativepump
gas bag withdiluted gas④

11-3. Calibration Method
 Maintenance Mode

CAUTION While in maintenance mode, the external contact does not operate when theconcentration of gas reaches or exceeds the alarm set value. The product inmaintenance mode maintains the current status while the display shows [].
This mode is canceled by repeating the same operation(1 to 6), turning the product OFF,or waiting 8 hours.

(1)

While in gas monitor mode, press the MODE switch of the main unit first. Then press theUP switch with the magnetic stick within approximately 2 seconds.

(2)

The main unit displays
first, followed by.
(The product is ready to work but nothing has been operated.)(3)

Press the UP or DOWN switch of the main unit with the magnetic stickic and adjust thevalue to(4).

Press the ENTER switch of the main unit.

Gas concentration(5)

When the above items are displayed alternately, the product has been set to maintenance
mode.

(6)

Upon completion of this mode, the product will automatically return to gas monitor mode.

(7)

While

(8)

This mode will be canceled by repeating the same operation (1 to 6 above), turning the
product OFF, or waiting for 8 hours.

is displayed, the maintenance mode is being executed.

Carefully handle and make settings with the magnetic stick because the magnet is very
powerful. For details, refer to 3. Contents of Package.

25

 Zero Adjustment
 The external contact may operate. Therefore, set the product to maintenance mode if needed.

MEMO

Conduct the zero adjustment in a place where there is no ambient gas.

(1)

While in gas monitor mode, press the MODE switch of the main unit first. Then press theUP switch with the magnetic stick within approximately 2 seconds.

(2)

The main unit displays
first, followed by.
(The product is ready to work but nothing has been operated.)(3)

Press the UP or DOWN switch of the main unit with the magnetic stick and adjust the value
to

(4)

.

Press the ENTER switch of the main unit.

(5)
↓

↓

(6)

When the above items are displayed, the zero adjustment is completed.

(7)

Upon completion of the zero adjustment, the product will automatically return to gas
monitor mode.

 If an error is displayed, refer to 10. Trouble Alarm.
 Carefully handle and make settings with the magnetic stick because the magnet is very
powerful. For details, refer to 3. Contents of Package.

26

 Span Fine-tuning
MEMO

Be sure to conduct the zero adjustment before performing span fine-tuning.

CAUTION The external contact may operate during span fine-tuning. Set the product tomaintenance mode or release the interlocks of the external devices if needed before
performing span fine-tuning.
 Only New Cosmos Electric Co., Ltd. maintenance service members or personnel who
have completed a maintenance seminar can perform fine-tuning.

(1)

Apply calibration gas corresponding to the equipment.

Calibration gas
Calibration cap(2)

Sufficiently stabilize the gas.

(3)

While in gas monitor mode, press the MODE switch of the main unit first. Then press theUP switch with the magnetic stick within approximately 2 seconds.

(4)

The main unit displays
first, followed by.
(The product has completed starting but nothing has been operated.)
Example: After zero adjustment,
will be displayed.

(5)

Press the UP or DOWN switch of the main unit with the magnetic stick and adjust the value
to
.

(6)

Press the ENTER switch of the main unit.

(7)

The main unit displays(8)

Press the UP or DOWN switch of the main unit with the magnetic stick, and adjust thedisplay of the main unit to the actual span gas concentration.

(9)

Press the ENTER switch.

first, followed by the present gas concentration.

(10) The span fine-tuning is completed whenis displayed.

(11) Upon completion of the span fine-tuning, the product will automatically return to gas
monitor mode.
(12) Remove the gasbag.
 Perform span rough adjustment if

oris displayed.

 If an error is displayed, refer to 10. Trouble Alarm.
 Carefully handle and make settings with the magnetic stick because the magnet is very
powerful. For details, refer to 3. Contents of Package.

27

 Span Rough Adjustment
 Perform span rough adjustment if

oris displayed.

CAUTION The external contact may operate during span rough adjustment.
Before performing span rough adjustment, set the product to maintenance mode orrelease the interlocks of the external devices if needed.
 Only New Cosmos Electric Co., Ltd. maintenance service members or personnel who
have completed a maintenance seminar can perform span rough adjustment.

(1)

Apply calibration gas corresponding to the equipment.

(2)

Sufficiently stabilize the gas.

(3)

While in gas monitor mode, press the MODE switch of the main unit first. Then press theUP switch with the magnetic stick within approximately 2 seconds.

(4)

The main unit displays
first, and displays.
(The product is ready to work but nothing has been operated.)
Example: After zero adjustment,
will be displayed.

(5)

Press the UP or DOWN switch of the main unit with the magnetic stick and adjust the value
to
.

(6)

Press the ENTER switch of the main unit.

(7)

The main unit displays(8)

Press the UP or DOWN switch of the main unit with the magnetic stick, and adjust thedisplay of the main unit close to the actual span gas concentration.

(9)

Press the ENTER switch.

first, and displays the present gas concentration.

(10) The span rough adjustment is completed whenis displayed.

(11) On completion of the span rough adjustment, the product will automatically return to gas
monitor mode.
(12) Remove the gasbag.
MEMO

Precise adjustment is not performed only by span rough adjustment. Perform spanfine-tuning after span rough adjustment.

 If an error is displayed, refer to 10. Trouble Alarm.
 Carefully handle and make settings with the magnetic stick because the magnet is very
powerful. For details, refer to 3. Contents of Package.

28

 Full-scale and Alarm Set Value Display
 The full-scale and alarm set values are only displayed. They cannot be changed.

(1)

While in gas monitor mode, press the MODE switch of the main unit first. Then press theUP switch with the magnetic stick within approximately 2 seconds.

(2)

The main unit displays
first, and displays.
(The product is ready to work but nothing has been operated.)
Example: After zero adjustment,
will be displayed.

(3)

Press the UP or DOWN switch of the main unit with the magnetic stick and adjust the value
to
.

(4)

Press the ENTER switch of the main unit.

↓↓
Full scale↓↓
Alarm set value(5)

When the above items are displayed in sequence and repeatedly, the user can check thefull-scale and alarm set values.

(6)

After the full-scale and alarm set values are displayed, the product will automatically returnto gas monitor mode.
 Carefully handle and make settings with the magnetic stick because the magnet is very
powerful. For details, refer to 3. Contents of Package.

29

 Test Mode Test values are adjusted and used for tests in this mode.

CAUTION The external contact may operate while the product is in test mode.
Before setting the product to test mode, set the product to maintenance mode or release
the interlocks of the external devices if needed.

(1)

While in gas monitor mode, press the MODE switch of the main unit first. Then press theUP switch with the magnetic stick within approximately 2 seconds.

(2)

The main unit displays
first, and displays.
(The product is ready to work but nothing has been operated.)
Example: After zero adjustment,
will be displayed.

(3)

Press the UP or DOWN switch of the main unit with the magnetic stick and adjust the value
to
.

(4)

Press the ENTER switch of the main unit.
↓
Test value(5)

When the above items are displayed, the test operation of the product in a concentration
range from 10% to 110% of the full scale.
The test operation of the product is possible in a concentration range from 200 to 2200
ppm if the full scale of the product is 2000 ppm.
The test operation of the product is possible in a concentration range from 10%LEL to
110%LEL if the full scale of the product is 100%LEL.

(6)

Press the UP or DOWN switch of the main unit and set the desired calibration
concentration. Then the test will start.
If the setting is outside the operating range,orwill be displayed.

(7)

To quit the test mode, press the ENTER or MODE switch.

(8)

When the test is finished with the ENTER switch pressed, the tested value will be saved.
When the test is finished with the MODE switch, the previously saved value will remain.
 Carefully handle and make settings with the magnetic stick because the magnet is very
powerful. For details, refer to 3. Contents of Package.

30

11-4. Replacement of Sensor UnitWARNING Be sure to turn OFF the indicator unit, signal converter or main body equipment before
replacing a sensor unit. Otherwise, they may become a source of ignition.
 Be sure that the sensor and the sensor connector have been firmly connected to thedetector before the power is turned on. If the sensor and the detector are incorrectly
connected, the detector cannot detect gas.
 The dimensions of flameproof joint between casing and casing cover of KD-12 flameproof
housing are exceeding the minimum requirements stated EN/IEC60079-1. Please contact
the manufacturer for inspection, repair and/or adjustments of this flameproof.
？

CAUTION Only New Cosmos Electric Co., Ltd. maintenance service members or personnel who
have completed a maintenance seminar can replace the sensor unit.
 Be sure to handle the sensor unit with care. Do not drop or throw the sensor unit.
Otherwise, the sensor wire may be disconnected or a sensor failure may result.
 The external contact may operate when replacing the sensor unit if the sensor output is
not stable. Release the interlocks of the external devices if needed.
 When removing or mounting the sensor unit, do not twist the harness of the sensor
connector.
 When closing the casing cover, make sure that the power supply cord, harness, or O-ringis not caught by the casing cover.

31

Sensor unit

Sensor replacement jig

Sensor guard(1)Turn OFF the power supply connected to the product.

(2)

Loosen the bolt with a hexagon socket on each of the four corners of the main unit with theprovided hexagon wrench with a nominal diameter of 4 mm, and open the casing cover ofthe main unit.

(3)

Disconnect the sensor connector.

(4)

Dismount the sensor guard.

(5)

Use the sensor replacement jig, and turn and pull out the sensor unit.

(6)

Insert a new sensor unit and tighten the sensor unit by using the sensor replacement jig.

(7)

Connect the sensor connector.

(8)

Check that the sensor connector is connected securely.

(9)

Mount the sensor guard.

(10) Tighten the bolt with a hexagon socket (tightening torque : 0.8 – 2.4 N・m) on each of thefour corners of the main unit with the provided hexagon wrench with a nominal diameter of
4 mm, and close the casing cover of the main unit.
(11) Turn ON the power supply connected to the product.
(12) When the sensor unit has been replaced, it is necessary to make zero adjustment andspan adjustment after keeping the product turned ON for approximately one week tostabilize the sensor output.

(13) Be sure to make zero adjustment first, followed by span adjustment.
(14) If an error is displayed, refer to 10. Trouble Alarm.
MEMO The sensor replacement jig is an optional product.
 Return the used sensor unit to your local representative.

32

12. Troubleshooting Before requesting repairs, refer to the following table. Consult your New Cosmos
representative if the product does not return to normal after taking the corresponding remedies
shown below or if the defective condition is not found in the table.
 If the product goes into an unintended mode at the adjustment or setting stage, stop operating
the product immediately and consult the system administrator.
Defective condition

Probable cause

The green power lamp is
not lit.

The yellow lamp to
indicate an error is flashedand the error code isdisplayed.

RemedyIncorrect wiring
connection.

Check and redo thewiring.

Low-voltage state

Check the power supply
voltage.

The sensor unit isdefective, the connector
is disconnected, or thesensor wires are broken.

The product is inmaintenance mode.

Return the product togas monitor mode.

The product is inmaintenance mode.

Return the product togas monitor mode.

Incorrect wiring
connection.

Check and reconnect thewiring.

The alarm point setting
is wrong.

Check the alarm setting.

The analog signal does
not change

The product is in test
mode.

Return the product togas monitor mode

A value andare flashing alternately.

The sensor output ishigh.

There is no alarm contact
output.

A value andflashing alternately.

P. 12
Wiring andConnection

Check that the sensor
connector is connected
securely.
If there is a possibility
that the sensor isdefective or sensor
wires are broken,
contact your local
representative.

The detected gas
concentration andare flashingalternately.

Reference pageare

The sensor output is low.

No adjustment or setting ispossible.

The product is operated
during the initial delay
time.

33

The concentration of gas
is in excess of the fullscale. Check theambient environment.
Conduct zeroadjustment after
checking that the airaround the product is notcontaminated with gas.
Operate the productafter the 30-second
initial delay time.

P. 12
Wiring andConnection

P. 25
Maintenance
Mode
P. 25
Maintenance
mode
P. 12
Wiring andConnection
P. 29
Full-scale andAlarm Set Display
P. 30
Test mode

P. 26
Zero adjustment
Ｐ. 18
Display at Start-up(Initial Delay)

13. Specifications
Model

KD-12B (SIL2 Capable)

Detection principle

Catalytic sensor

Sampling method

Diffusion type

Detection gas

Depends on the specifications.

Detection range

Depends on the specifications.

Gas concentration
display

Four-digit digital LED display

Alarm set value

Depends on the specifications.

Alarm accuracy

 Combustible gas: 25% of alarm set value under identical conditions.
 Toxic gas: 30% of alarm set value under identical conditions.

Alarm delay

 Combustible gas: Within 30 seconds with gas concentration that is 1.6 times
as high as the level of alarm set concentration.
 Toxic gas: Within 60 seconds with gas concentration that is 1.6 times as highas the level of alarm set concentration.

Warning display

 Gas alarm (one stage only) :Red LED lamp flashes
 Trouble alarm (sensor disconnection, sensor zero drop, power supply voltage
error, or internal EEPROM communication error) :Yellow LED lamp flashes

External output

Gas concentration analog signal
 4 to 20 mA DC (common to the negative side of power supply)
 0.9 mA DC or less at the time of Trouble alarm.
 1.6 mA during the initial delay period.
 Make sure that the load resistance of the analog signal is less than 300 ohm
including the wiring resistance.
Gas alarm contact (one stage only) 1a no-voltage contact output/Non-latching Rated load: 0.5 A at 250 VAC or 0.5 A at 30 VDC (resistance load)

Equipment or Protective Directive 2014/34/EU
System intended for use SI 2016 No.1107
in Potentially Explosive
Atmospheres
Explosion-proof ClassII 2 G Ex db IIC T5 Gb (ATEX)II 2 G Ex db IIC T5 Gb (UKEx)
Ex db IIC T5 Gb (IECEx)

Approvals

EU-Type Examination Certificate Number : DEMKO 08 ATEX 143870 X(CE 2776
II 2 G Ex d IIC T5 Gb)
UKEx Examination certificate: CML 21UKEX11353X(UKCA 2503
II 2 G Ex db IIC T5 Gb)
EMC : EN61000-6-4:2007+A1:2011, EN50270:2015 - Type 2
Performance testing : The measuring function of the KD-12 gas detector for
explosion protection, according to Annex II clause 1.5.5, 1.5.6 and 1.5.7 of the
Directive 2014/34/EU, is not covered in this certificate.
IECEx : ULD 13.0001X (Ex db IIC T5 Gb)

Harmonised/Designated EN IEC 60079-0:2018, EN 60079-1:2014
standards
IEC 60079-0:2017 Edition 7.0, IEC 60079-1:2014 Edition 7.0
Degree of protection

IP65 (Exterior)

Functional Safety

 SIL2 capable Hardware fault tolerance: zero (0) Applicable standards: IEC 61508-2, EN 61508-2 and JIS C 0508-2.

34

Applicable cable

Cable outer diameter (10 to 13 mm)
 In the case of a 5-conductor cable (for power supply, gas concentration analog
signal, and gas alarm contact): CVV-S 1.25 mm2.
 In the case of a 3-conductor cable (for power supply and gas concentration
analog signal) CVV-S 2 mm2Operating temperatureand humidity ranges

 Temperature: 10C to 50C Humidity 10% to 90% (0 to 50C).
(No radical temperature or humidity changes and no condensation)

Power supply

24 VDC (18 to 30 VDC)

Power consumption

3 W max.

Size

128 (W) x 116 (H) x 68 (D) mm (excluding protruding parts)

WeightApprox. 1.2 kg

Mounting method

Wall mounting

The above specifications are subject to change without notice.
If your specifications are nonstandard, refer to the delivery specifications.

14.

Markings of explosion-proof-Nameplate detail-Serial number label detail-Certificate label detail-Rated label detail-Warning label detail-Harmonised/Designated standards
EN IEC 60079-0:2018
EN 60079-1:2014
IEC 60079-0:2017 Edition 7.0
IEC 60079-1:2014 Edition 7.0

35

15.

Warranty

New Cosmos Electric Company Limited (hereafter referred to as “New Cosmos”) offers thefollowing as the sole and exclusive limited warranty available to the Customer.
This warranty is in lieu of, and the Customer waives, all other warranties of any kind or nature,
expressed or implied, including without limitation any warranty for merchantability or fitness for aparticular purpose. The remedies set forth herein are exclusive.
New Cosmos warrants to the original purchaser (Customer) and no other person or entity thatthe gas 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
apply to consumables, including but not limited to fuses and filters. Certain other accessories not
specifically listed here may have different warranty periods.
If after examination of an allegedly defective product returned to New Cosmos, with freight
prepaid, should it be found that the product fails to conform to this warranty, the Customer’s only
remedy and New Cosmos’s only obligation shall be, at New Cosmos’s sole discretion,
replacement or repair of the non-conforming product or refund of the original purchase price ofthe non-conforming product. In no event shall New Cosmos be liable for any other special,incidental, or consequential damages or losses of any kind whatsoever, including but not limited
to loss of anticipated profits and any other loss caused by reason of 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 recommendations. New Cosmos shall be released from all
obligations under this warranty in the event repairs or modifications are made by persons otherthan its own or authorized service personnel or if the warranty claim results from physical abuseor misuse of the product.

36

16.

Life Expectancy

 The period of designed life expectancy of the product under standard environmental
conditions is approximately five years after the date of purchase.
The period of designed life expectancy after the expiration of the warranty period is a roughstandard on the condition that the product is used with specified gas calibration performed.
New Cosmos, however, does not guarantee the specified period of designed life expectancy.
The product may become unusable before the next calibration is performed.
 The life of the catalytic combustion-type sensor incorporated in the KD-12B is approximately
three years after the date of purchase.
The sensor may not detect gas correctly with the lapse of approximately three years. Replace
the sensor at intervals of approximately three years. The life of the sensor is specified on thecondition that the sensor is serviced properly and that the sensor is not exposed tohigh-density gas or toxic gas. New Cosmos, however, does not guarantee the specified life of
the sensor.

17.

Detection Principle
Catalytic Combustion

・Catalytic combustion occurs on the catalyst even at a gas concentration below the lower
limit of combustion due to the operation of the catalyst applied to the platinum coil. The
electrical resistance of the platinum coil increases because of the rise in the temperature
at this point. This difference is extracted as deviation voltage in the bridge circuit.
Detection of combustible gases is possible up to the lower explosion limit (LEL).

37

18.

Glossary

Indicator / Alarm unit:

A unit that receives signals from the gas detector and indicatesgas concentration and alarms.

Detector:

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

Backup power source device:

A device that supplies power to the gas detector,

indicator / alarm unit in order to maintain its performance during
a power failure.
Flow meter:

A meter to measure air flow in gas sampling pipe.

Gas collector:

A gas collecting probe that enhances gas collection efficiency
and blocks water and dust.

Diffusion type:

A method to detect gas by utilizing convection and diffusion ofgas.

Explosion proof construction:

A totally enclosed structure. When an explosive gas

explodes in a container, the container can resist the pressure
and prevent the ignition of explosive gases outside of it.
Preset alarm value:

A preset value for the alarm to go off when gas concentration
reaches a certain value.

Gas to be detected:

Gas that is detected and indicated which sets off an alarm.

Detection range:

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

Alarm accuracy:

Difference

betweenthepreset

alarm

value

and

gas

concentration when an alarm actually occurs or as thepercentage of the difference compared to the preset alarm
value.
Response time:

Time it takes from when the gas detector is exposed to a gas
with a concentration higher (lower) than the preset alarm value
until an alarm goes off.

Temperature range:

Range of temperature where the equipment can perform its
functions.

Maintenance and inspections:

Work to guarantee that the equipment perform its

required functions.
Calibration gas:Gas used to calibrate scales of the equipment.

Peak hold:A function to constantly update and hold the peak value of input
signals.

38

Hazardous area:

An area in a plant or facility with a hazardous atmosphere
where explosive gases may mix with air and explode or start afire. An area where gas may be present.

Non hazardous area:

An area where electric equipment that has no potential to createa hazardous atmosphere.

Hazardous atmosphere:

Atmosphere within the explosive limit where explosive gas andair are mixed.

LEL:

Lower Explosive Limit.

The lowest concentration of flammablegas that will explode when mixed with air and ignited.
(Quoted from gas detection terms and detector tube gas meter terms used by the Industrial
Gas Detector Alarm Association.)

39

MEMO

40

Manual Revision History
Edition No.

Date

Revisions

GAE-054-00

July 201400

GAE-054-01

November 2016

01

GAE-054-02

August 201702

GAE-054-03

October 201803

GAE-054-04

January 201904

GAE-054-05

July 201905

GAE-054-06

December 201906

GAE-054-07

April 2021

07

GAE-054-08

September 2022

08

Additional copies of this Instruction Manual are available.
Contact the following address for ordering information.

Distributor:

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