Diffusion type Gas Detector

Model KD-14
Instruction Manual

Keep this instruction manual where it is readily accessible.
Thoroughly read this instruction manual before using the equipment so it can be used safely andcorrectly.
This manual provides information concerning standard specifications. If the specifications ofyour model are nonstandard, refer to the delivery specifications.

Instruction Manual No.
GAE-043
August 2012

• Part Names and Functions

See pages 18 to 19.

See pages 4 to 5.

• Wiring and Connecting
Methods• Maintenance Check andOperation Methods

See pages 11 to 13.

See pages 15 to 17.

CVVS cable
Indication
alarmPower-supply
groundterminal

Groundterminals
Non-grounded• Replacement of Sensor Unit

GroundedTable of Contents
1. Introduction................................................................................................................................... 1
2. Precautions................................................................................................................................... 2
3. Contents of Package .................................................................................................................... 3
4. External Dimensions and Nomenclature...................................................................................... 4
4-1. Main Unit................................................................................................................................ 4
4-2. Terminal Block ....................................................................................................................... 5
5. Installation .................................................................................................................................... 6
5-1. Installation Method ................................................................................................................ 6
5-2. Examples of Installation Positions......................................................................................... 9
5-3. Mounting of Optional Items ................................................................................................. 10
6. Wiring Method .............................................................................................................................11
6-1. Wiring Work ..........................................................................................................................11
6-2. Wiring and Connection ........................................................................................................ 12
7. Precautions before Use.............................................................................................................. 14
8. Maintenance Check and Operation Method .............................................................................. 15
8-1. Daily Inspection and Periodical Inspection ......................................................................... 15
8-2. Preparing Calibration Gas ................................................................................................... 16
8-3. Replacement of Sensor Unit ............................................................................................... 18
9. Specifications.............................................................................................................................. 20
10. Warranty ................................................................................................................................... 21
11. Life Expectancy ........................................................................................................................ 22
12. Detection Principle ................................................................................................................... 23
12-1. Catalytic Combustion ........................................................................................................ 23
12-2. Hot Wire Semiconductor ................................................................................................... 23
12-3. Thermal Conductivity......................................................................................................... 23
13. Glossary ................................................................................................................................... 24

1. Introduction• Thank you for purchasing the KD-14 Diffusion type Gas Detector.
• In order to ensure the correct and safe operation of this product, be sure to read this 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, such as gas production plants and depots,
chemical plants, paint factories, and power plants.
• Select from KD-14A, KD-14B and KD-14C models, each of which incorporates a gas sensor,
according to the required specifications. The detection principle for the gas sensor differs forthese models.
• Maintenance and inspection are indispensable to the reliable performance of the Gas
Detection/Alarm System. Be sure to perform the maintenance checks described in this manual.

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.

WARNINGBe 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.

CAUTION
Licensed members should implement all necessary work for the product including wiringand installation in accordance with all applicable laws and regulations.
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.
Do not use the Detector continuously over a long period of time in an environment that
contains organic solvents, such as aromatic hydrocarbons and halogen hydrocarbons.
Be sure to provide a protective cover (optional) if the product is installed outdoors.
Use the product in accordance with applicable laws and regulations.

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 (see note 1)
12- and 13-mm-dia. pressure-proof packings:
1 each11- and 14-mm-dia. washers: 2 each
One C-clamp
Two M5 screws
Hexagon wrench (nominal dia. 2 and 4):
1 each (see note 2)
Instruction Manual (see note 2)

Protective cover (see note 3)
Horizontal type: KW-41
Vertical type: KW-42
PB-1 2B Pole Mounting Bracket (see note 3)
SK-1 Sensor Replacement Jig (see note 3)
GCP-09 Calibration Cap (see note 3)
Z-001K Gas Calibration Kit
2 bulb hand pump
Capillary for 2 bulb hand pumpNote: 1. The standard product incorporates a built-in pressure-proof packing (12.5-mm dia.), washer(12-mm dia.), and B-clamp.
2. A hexagon wrench and Instruction Manual are provided for each order.
3. The optional items are for use only by the KD-14.

3

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

NumberName

Description

1

Casing cover2

Casing3

Sensor unit

Incorporates a gas sensor.

4

Sensor guard

Protects the sensor unit.

5

Ground terminal

Used when grounding the frame.

6

Cable gland

Used to secure the cable. Compatible screw: G3/4.

Bolt with hexagon
socketBolt with hexagon
socketUsed for securing the cable gland. Use a hexagon wrench with anominal diameter of 2 mm.
Used for securing the casing cover. Use a hexagon wrench with anominal diameter of 4 mm.

78

4

4-2. Terminal BlockGas Detector

Ground terminal

Terminal

Ａ

Ｂ

Ｃ

Ｄ

Sensorconnector

O-ringNumberDescriptionA
BC

Gas detectors

D
Ground terminal

Use to ground the frame.

55. Installation
5-1. Installation Method

CAUTIONBe 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 exposed to water directly.
- 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.

• 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).

6

•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.

110

（55）

32

Mounting holeTwo,
5.5-mm-dia. holes
2-φ5.5

Mounting hole•

The casing cover of the Detector must be opened to connect the wiring or replace the sensor
unit. When installing the gas detector, provide sufficient space to enable the casing cover to beopened to at least 90°.

At least 90°

7•

When installing the diffusion type gas detector to the ceiling or high location, consider tosecure the work space underneath the detector for inspection and maintenance. Also, in caseof installing the detector at higher location than 3 meters, the sampling pipe should be laid
down to the ceiling.

•

In case of installing at the ceiling or high location, please do not attach the sensor guard. On
the other hand, in case of installing the detector at the floor where it may be exposed to water,
make sure to attach the sensor guard.

•

Decide the direction of holes, considering the gas flow when attaching the sensor guard.

Attach the sensor guard careful not
to block the gas flow by the holes.

Flow of gas

8

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)

Entrances and windows(Suction and exhaust ports)

Gas detector
mounting
position

Entrance(Suction port)

Plan view

Side view
Example of Installation Position

Partition
wall

Pipe
Valve

Detector

FlangeExample of Outdoor Installation Position95-3. Mounting of Optional Items
・Protective Cover

(169)

(90)
(90)
M3 screw(169)

M3 screw
(169)
(169)

Horizontal Type (KW-41)

Vertical Type (KW-42)

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

・2B Pole Mounting Bracket

106. Wiring Method6-1. Wiring Work・ Be sure to provide explosion-proof wiring if the product is to be used in hazardous places.

CAUTION
Licensed members should implement all necessary work for the product including wiringand installation in accordance with all applicable laws, regulations and standard.

Cable Work
• Use a shielded cable, such as CVV-S with a thickness of 0.75 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 explosion-proof packing lead-in method, refer to the following table and use acable with the finished diameter matching the inner diameter of the packing. In order to preventthe spread of explosive gas or fire, securely tighten the cable gland.
• It is recommended not to connect two cables together. If it is unavoidable, however, connect
them or branch them within the explosion-proof casing of the main unit.
Packing

WasherInner dia.

Inner dia.

10 to 10.4

11.5

11

10.5

12

11

11

12

12

11.5

12.5

12

12

13

14

12.5

13.5

14

13

14

14

Cable outer dia.

Clamp

Accessory or
Optional item
Optional item

C Clamp

B Clamp

Accessory
Built-inaccessory
Accessory

A Clamp

Optional item

* A pressure-tight packing with diameter of 12.5 mm, a washer with diameter of 12 mm, anda B clamp, all of which correspond to a cable with diameter of 11.5 mm, are built into thestandard model.
* Each one of pressure-tight packing with diameter of 12 and 13 mm, two washers withdiameter of 11 and 14 mm, and a C clamp are provided with the standard model, tocorrespond to cables with a diameter of 10.5, 11 and 12 mm.
* If the cable diameter is other than 10.5 to 12 mm, select the corresponding pressureresistant packing, washer, and clamp from the above table, and order them from New
Cosmos.

11

6-2. Wiring and Connection

WARNING
Before opening the casing cover of the gas detector, be sure to turn off the product andall devices (e.g., indicator unit and signal converter) connected to the product.
If the power is turned ON, the power supply may become a source of ignition.
Be sure to ground the product to prevent electric shocks.

CAUTION
Wire the connecting terminals correctly.
Separate connection cables from power lines as far as possible.
When closing the casing cover, make sure that the power supply cord, harness, orO-ring is not caught by the casing cover.

Connecting Power Supply and Signal Wires
1)

Connecting power supply
Provide dedicated breakers, if needed, to lines that are connected to peripheral devices, suchas indicator units and signal converters.

2)

Connecting between indicator unit and gas detector
Use the appropriate cable for the installation site, such as 600V vinyl insulated wire (VI), VCT,or CVV (0.75 square millimeter to 2.00 square millimeter).

MEMO● The length of wiring should be less than 10 ohm of the single line resistance.
The following are the examples.
0.75 square millimeter wire: within 400 meter
1.25 square millimeter wire: within 600 meter2.00 square millimeter wire: within 1 kilometer

12

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
CVVS cable

Indicator

Ground terminal on
power supply side
Groundterminals
Not grounded

Grounded・Refer to the Instruction Manual of each device for details.

13

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.

14

8. Maintenance Check and Operation Method8-1. Daily Inspection and Periodical Inspection
Daily inspections are conducted by the user, while periodical inspections are conducted by yourlocal representative.

Frequency

At least oncea monthChecking item

Contents of inspection• Clogging of flame arrester.
• Corrosion of flame arrester.
• Corrosion of the main unit.
• Corrosion of mounting screws.
If a failure is found, replace the parts.

Visual check

Apply inspection gas to the gas detector andcheck the alarm operation.
• Use the calibration cap, apply inspection gas,and check the alarm operation.
Daily
inspection
At least once
every few
monthsAlarm operation
check with realgas

Calibration gas

Calibration cap

Conditionaround gas
detector
Periodical
inspection

At least oncea yearCheck that nothing interrupts the diffusion ofgas around the gas detector.
Consult your local representative.

● Use optional products to conduct real 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 your local representative.

15

8-2. Preparing Calibration Gas• Calibration gas is used for actual gas inspection.
• The following example shows how to prepare a standard gas of 0.72vol% (40%LEL) isobutane.

With a standard gas cylinder●●

Fill a gas bag with standard gas as shown the figure below.
Evacuate the air from gas bag completely before filling the gas to prevent gas
concentration error due to the air in gas bag.

0.72 vol% isobutane
air balanceStandard gas cylinder

GasbagMEMO• Use a urethane gasbag. Leave for about 30 minutes after filling gas to bring humidity in gas bag
close to the ambient condition before use.

16

Without standard gas cylinder●

Use Gas Calibration Kit (optional item) and pure gas cylinder (isobutane 99 vol% or more).
Dilute isobutane with air to produce calibration gas of 0.72 vol% (40%LEL).

Memo

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

DANGER

Make sure that there are no flammables nearby when handling flammablegas with a concentration over LEL (lower explosive limit).

1.

1) Drawing raw gas
Connect gas bag to pure gas cylinder and fill with gas
slightly more than necessary. Bend back the hose and clamp
by pinchcock to prevent the gas from leaking.

Pure gas cylinder(keep it upright)

22) Drawing a fixed amount of raw gas

7.2ml of raw gas

Connect 10 ml syringe to gas bag and take 7.2 ml of raw gas.
(Take the gas slightly more than necessary and thencarefully discharge the excess gas.)
Gas bag with
raw gas3) Transferring raw gas into a quantitative pump3

Connect syringe to the inlet of quantitative pump, and pull thepiston to fill pump with raw gas in the syringe. Remove thesyringe and pull the piston all the way out (100 ml).

Quantitative pump.
4) Making diluted gas

4Connect empty gas bag to the outlet of quantitative pump andpush the piston. Move the piston back and forth for 9 times to
add air and make dilute gas.

17

Gas bag withdiluted gas

8-3. Replacement of Sensor UnitWARNING• Be sure to turn OFF the indicator unit or signal converter before replacing a sensor unit.
Otherwise, they may become a source of ignition.
• Do not damage the surface of detector when sliding the sensor unit, or the explosion
proof performance may be adversely affected.

CAUTION• The setup data of the Detector may have to be re-written depending on the type ofthe sensor. Only your local representative’s 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.

18

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

MEMO• The sensor replacement jig is an optional product.
• Return the used sensor unit to your local representative.
• 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.

19

9. Specifications
Corresponding
sensor type

Hot wire semiconductor type (KD-14A)
Catalytic combustion type (KD-14B)
Thermal conductivity type (KD-14C)

Sampling method

Diffusion type

Detection gas

Depends on the specifications

Detection range

Depends on the specifications

Explosion-proof
performance

Exd II CT5 (Japan)

Degree ofprotection

IP65

Applicalbe calbe

Cable outer diameter (10 to 13 mm)
4-core cable (sensor power, sensor output)
CVV-S 0.75 square millimeter, 1.25 square millimeter, or 2.0 square millimeter.
Interconnection resistance should be less than 10 ohm.

Operatingtemperature andhumidity range

Temperature: -10 to 50 degrees C
Humidity: 10 to 90%RH (0 to 50 degrees C)(No radical temperature or humidity changes and no condensation)Powerconsumption

1W max.

Dimensions

158 (W) x 116 (H) x 68 (D) mm (excluding protrusions)

WeightApprox. 1.2kg

Mounting method

Wall mounting

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

2010. Warranty
New Cosmos Electric Company Limited (New Cosmos) offers the following as the sole andexclusive limited warranty available to the customer.
This warranty is in lieu of, and 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 and no other person or entity (the customer) 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 notinclude 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 suchnon-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 orlosses of any kind whatsoever, including but not limited to, loss of anticipated profits and any otherloss 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/or recommendations. New Cosmos shall be released from all obligations under
this warranty in the event repairs or modifications are made by persons other than its own orauthorized service personnel or if the warranty claim results from physical abuse or misuse of the
product.

21

11. Life Expectancy
The design period longevity under a general environmental condition of this container is about
five years from purchase. The design life expectancy after the guaranteed term passes is not
the one to guarantee this. It is only a guide when a prescribed gas is proofread and it uses it. It
might be impossible to use between the proofreading and the proofreading schedule for the
next term.
.
The life of the sensor after the date of purchase under a general environmental condition isrecommended in the table below. The sensor may not detect gas correctly with the lapse of thesensor life. Replace the sensor at intervals of the sensor life.
The life of the sensor is specified on the condition that the sensor is serviced properly and thatthe sensor is not exposed to high-density gas or sensor poisoning gas. New Cosmos,
however, does not guarantee the specified life of the sensor.

Model

Detection principle

Sensor life

KD-14A

Hot wire semiconductor

Approx. 5 years

KD-14B

Catalytic combustion

Approx. 3 years

KD-14C

Thermal conductivity

Approx. 5 years

2212. Detection Principle
12-1. Catalytic Combustion
Catalytic combustion occurs on the catalyst even at a gas concentration below the lower limitof combustion due to the operation of the catalyst applied to the platinum coil. The electricalresistance 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).

12-2. Hot Wire Semiconductor
When a metal-oxide semiconductor heated by a platinum coil adsorbs an electron-donating
gas, such as a combustible gas, its electron concentration increases and the thermal
conductivity of the semiconductor improves. As a result, the temperature of thesemiconductor falls and the resistance of the platinum wire reduces. This difference isextracted as deviation voltage in the bridge circuit.
The feature of this sensor is its extreme sensitivity at low temperatures, which makes itsuitable for sensitive detection.

12-3. Thermal Conductivity
As compared to when only air is present around the sensor, the heat dissipation state of thedetection piece (heated to around 150℃) to which an inert substance is applied and sinteredon a platinum wire varies with the increase or decrease in the thermal conductivity of the gas,
and the temperature of the detection piece changes. This difference is almost proportional to
the gas concentration, and therefore, the difference in the resistance of the platinum wire canbe extracted as deviation voltage of the bridge circuit.
Although only gases whose thermal conductivity is different from air can be measured, it ispossible to detect high-concentration gases between 0% and 100% by volume.

2313. Glossary
Indicator / Alarm unit: A unit that receives signals from the gas detector and indicates gas
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 of gas.

Explosion proof construction:
A totally enclosed structure. When an explosive gas explodes
in a container, the container can resist the pressure and prevent theignition of explosive gases outside of it.
Preset alarm value:

A preset value for the alarm to go off when gas concentration reaches acertain 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 between the preset alarm value and gas concentration when an
alarm actually occurs or as the percentage of the difference compared tothe preset alarm value.

Response time:

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

Temperature range:

Range of temperature where the equipment can perform its functions.

Maintenance and inspections:functions.

Work to guarantee that the equipment perform its required

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.

Hazardous area:

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

Non hazardous area: An area where electric equipment that has no potential to create ahazardous atmosphere.
Hazardous atmosphere: Atmosphere within the explosive limit where explosive gas and air are
mixed.
LEL:

Lower Explosive Limit. The lowest concentration of flammable gas thatwill 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)

24

Manual Revision History
Edition No.

Date

Revisions

GAE-043

August 201200

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
Phone 81-6-6309-1505
Fax 81-6-6308-0371
Email e-info@new-cosmos.co.jp
http://www.new-cosmos.co.jp