New Cosmos Electric KD-12 Instruction Manual
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New Cosmos Electric KD-12 Instruction Manual

Diffusion type gas detector
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Diffusion type Gas Detector
 Keep this instruction manual where it is readily accessible.
 Thoroughly read this instruction manual before using the equipment so it can be used
safely and correctly.
 This manual provides information concerning standard specifications. If the specifications
of your model are nonstandard, refer to the delivery specifications.
New Cosmos Electric Co., Ltd.
Model KD-12
Instruction Manual
Instruction Manual No.
GAE-055-08
September 2022

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Summary of Contents for New Cosmos Electric KD-12

  • Page 1  Thoroughly read this instruction manual before using the equipment so it can be used safely and correctly.  This manual provides information concerning standard specifications. If the specifications of your model are nonstandard, refer to the delivery specifications. New Cosmos Electric Co., Ltd. Instruction Manual No. GAE-055-08 September 2022...
  • Page 2  Nomenclature  Replacement of Sensor Unit See pages 5 to 7. See pages 22 and 23.  Wiring and Connecting  Display and Operation in Methods Each Mode See pages 13 to 16. See page 19. 24 V power supply Indicator E.g., External...

  • Page 3: Table Of Contents

    Table of Contents Introduction ........................1 Precautions ........................2 Contents of Package ....................4 External Dimensions and Nomenclature ..............5 4-1. Main Unit ........................5 4-2. Display and Control Blocks ..................6 4-3. Terminal Block ......................7 Installation ........................8 5-1.

  • Page 4: Introduction

    1. Introduction  Thank you for purchasing the KD-12 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 toxic gases such as carbon monoxide or hydrogen sulfide (carbon monoxide is also a combustible gas).

  • Page 5: Precautions

    2. Precautions  Read this manual completely and be sure you understand the information provided herein before attempting to use the 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 your company's regulations.
  • Page 6 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...

  • Page 7: Contents Of Package

    Capillary for 2 bulb hand pump Note: 1. A Instruction Manual is provided for each order. 2. The optional items are for use only with KD-12. WARNING  Do not use the magnetic stick for any purposes other than the operation of this product.

  • Page 8: External Dimensions And Nomenclature

    4. External Dimensions and Nomenclature 4-1. Main Unit (Dimensions are in mm) Item Component Description/Function Case cover Case Sensor unit Incorporates a built-in gas sensor. Earth terminal Used for grounding the frame. (external) Status lights Indicate the status of the unit: (3 places) power (green), alarm (red), and fault (yellow) Magnetic switches...

  • Page 9: Display And Control Blocks

    4-2. Display and Control Blocks Magnetic Switches Use the magnetic stick (MJ-1) to operate the magnetic switches. Item Component Description/Function Changes the operation mode or cancels the current [MODE] switch operation. [ENTER] switch Confirms a setting or executes an operation. [UP] switch Increases the parameter value.

  • Page 10: Terminal Block

    4-3. Terminal Block Terminal block 24V(+) POWER － 4～20mA Signal ＋ Ground Clamp terminal Lever Sensor O-ring connector Number Name Description 24 V (+) Power supply voltage (positive) Power supply voltage (-) and analog signal (negative) common Signal 4- to 20-mA (+) analog signal External contact Ground terminal Used to ground the frame.

  • Page 11: Installation

     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/mm  The dimensions of flameproof joint between casing and casing cover of KD-12 flameproof housing...
  • Page 12 CAUTION  Be careful not to damage the gas detector when installing it. Otherwise, the explosion-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 40C).
  • Page 13  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.

  • Page 14: Examples Of Installation Positions

    5-2. Examples of Installation Positions  Install the product in places where gas easily accumulates. Places where gas easily accumulates. Gas detector Roof fan Entrances and windows (Exhaust port) (Suction and exhaust ports) Entrance Gas detector (Suction port) mounting position Plan view Side view Example of Installation Position...

  • Page 15: Mounting Of Optional Items

    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. ...

  • Page 16: Wiring Method

    6. Wiring Method 6-1. Wiring Work  Be sure to provide explosion-proof wiring if the product is to be used in a hazardous area. 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.

  • Page 17: Wiring And Connection

    6-2. Wiring and Connection WARNING  Before opening the case cover of the gas detector, be sure to eliminate possible source of ignition. Disconnect the power supply to the detector and all devices connected to it (e.g. indicator unit and signal converter). ...
  • Page 18 Not grounded terminals Grounded System Configuration Example Single detector connected Multiple detectors monitored to indicator unit together Detector Detector Indicator unit KD-12 Security management system KD-12 KD-12 VISION S-500 KD-12 Comprehensive gas detection/alarm system KD-12 For details, refer to the Instruction Manual of each device.
  • Page 19 Typical Connection Procedure Prepare a power supply that can provide 24 V. (Do not turn on the power supply before wiring the main unit.) 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.

  • Page 20: Precautions Before Use

    7. Precautions before Use CAUTION  Before turning ON any of the devices (e.g., indicator unit, signal converter) connected to the 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 ...

  • Page 21: Display At Start-Up (Initial Delay)

    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 initial delay. Release the interlock of the external equipment if necessary. ...

  • Page 22: Display And Operation In Each Mode

    9. Display and Operation in Each Mode In excess of alarm set value Maintenance mode At start-up Gas monitor Test mode Gas monitor (Initial delay) mode Test mode mode Green lamp Red lamp Red lamp lamp Green flashes flashes flashes Green flashes lamp is...

  • Page 23: Trouble Alarm

    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. ...

  • Page 24: Maintenance Check And Operation Method

    11. Maintenance Check and Operation Method 11-1. Daily Inspection and Periodical Inspection  Daily inspections are conducted by the user, while periodical inspections are conducted by your local representative. Frequency Check item Contents of inspection  The status of lamp (green POWER indicator) is lit.

  • Page 25: Replacement Of Sensor Unit

    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.
  • Page 26 11-2. Replacement of Sensor Unit (Continued) Turn OFF the power supply to the Detector. Remove the sensor casing cover by rotating it in the direction of the arrow. (See the photograph below on the left.) Pull down the sensor to remove it (See the photograph below on the right.) The filter and packing may remain inside the sensor casing cover.

  • Page 27: Calibration Method

    11-3. Calibration Method  Maintenance Mode CAUTION  While in maintenance mode, the external contact does not operate when the concentration of gas reaches or exceeds the alarm set value. The product in maintenance mode maintains the current status while the display shows [ This mode is canceled by repeating the same operation(1 to 4), turning the product OFF, or waiting 8 hours.

  • Page 28: Zero Adjustment

     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. While in gas monitor mode, press the MODE switch of the main unit first. Then press the UP switch with the magnetic stick within approximately 2 seconds.
  • Page 29  Span Rough Adjustment  Perform span rough adjustment if is displayed. CAUTION  The external contact may operate during span rough adjustment. Before performing span rough adjustment, set the product to maintenance mode or release the interlocks of the external devices if needed. ...

  • Page 30: Span Rough Adjustment

     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 to maintenance mode or release the interlocks of the external devices if needed before performing span fine-tuning.

  • Page 31: Full-Scale And Alarm Set Value Display

     Full-scale and Alarm Set Value Display  The full-scale and alarm set values are only displayed. They cannot be changed. While in gas monitor mode, press the MODE switch of the main unit first. Then press the UP switch with the magnetic stick within approximately 2 seconds. The main unit displays first, and displays (The product is ready to work but nothing has been operated.)

  • Page 32: Test Mode

     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.

  • Page 33: Troubleshooting

    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. ...

  • Page 34: Specifications

    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.

  • Page 35: Markings Of Explosion-Proof

     Temperature: 10C to 40C Operating temperature  Humidity 30% to 85% RH and humidity ranges (No radical temperature or humidity changes and no condensation) Power supply 24VDC (18 to 30 VDC) Power consumption 3W max. Size 128 (W) x 120 (H) x 68 (D) mm (excluding protruding parts) Weight Approx.

  • Page 36: Warranty

    15. Warranty New Cosmos Electric Company Limited (hereafter referred to as “New Cosmos”) offers the following 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 a particular purpose.

  • Page 37: Detection Principle

    16. Detection Principle Electrochemical cell Electrochemical cell is a method of selectively performing only the electrolytic reaction of the target constituent gases, and then extracting and measuring the electrolytic current generated at that point. The gas sensor consists of electrodes, electrolyte solution, and a potentiostat.

  • Page 38: Glossary

    17. 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.
  • Page 39 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.
  • Page 40 July 2019 GAE-055-06 December 2019 GAE-055-07 April 2021 GAE-055-08 September 2022 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...

This manual is also suitable for:

Kd-12aKd-12bKd-12c

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