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New Cosmos Electric KS-7O Instruction Manual

Oxygen detector
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Instruction Manual
Keep this manual for easy reference.
Carefully read this manual prior to use.
This manual describes the standard model. If your unit has end-user-specific
options, this manual will be superseded by your delivery specifications.
Oxygen Detector
KS-7O
Instruction Manual No.
GAE-052-06
June 2023

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Summary of Contents for New Cosmos Electric KS-7O

  • Page 1 Oxygen Detector KS-7O Instruction Manual Keep this manual for easy reference. Carefully read this manual prior to use. This manual describes the standard model. If your unit has end-user-specific options, this manual will be superseded by your delivery specifications. Instruction Manual No.

  • Page 2: Table Of Contents

    Table of Contents 1. Introduction ..........................1 2. General Precautions ........................2 3. Package Contents ........................3 4. Unit Dimensions and Components .................... 4 4-1. Outer Appearance ........................4 4-2. Inner Components ........................5 5. Installation ..........................6 6. Wiring ............................9 6-1.

  • Page 3: Introduction

    1. Introduction Thank you for purchasing the New Cosmos KS-7O oxygen detector. To ensure safe and reliable operation, please read this instruction manual prior to use. This unit detects oxygen leakage/deficiency in working environments, e.g., semiconductor manufacturing plants and laboratories, and relays the oxygen concentration value as an analog signal (4-20mADC) to external devices while simultaneously displaying the concentration value on its display.

  • Page 4: General Precautions

    2. General Precautions Carefully read this manual prior to use. Follow the precautions below to ensure safe operation. Only use this product in accordance with the applicable laws and regulations. Only a qualified electrician with knowledge of wiring and installation procedures should perform wiring and installation.

  • Page 5: Package Contents

    New Cosmos or its authorized representative for replacement. Item Quantity Description Oxygen detector KS-7O Mounting screw M5x12 with spring washer (wall mounting) Cable tie To be used to bundle electric cables To be crimped to cables and inserted into the terminal...

  • Page 6: Unit Dimensions And Components

    4. Unit Dimensions and Components 4-1. Outer Appearance Dimensions are in mm. Item Component Description/Function Slide up and lift the cover to access to the main power switch and to Cover wire external cables. This cover is normally closed. Houses one mounting screw, and two fastening screws that attach the Screw cover cover to the unit.

  • Page 7: Inner Components

    4-2. Inner Components Item Component Description/Function Slide up and lift the cover to access to the main power switch and Cover to wire external cables. This cover is normally closed. Houses one mounting screw, and two fastening screws that attach Screw cover the cover to the unit.

  • Page 8: Installation

    5. Installation WARNING This product is not explosion-proof and should not be installed in a hazardous area. CAUTION Avoid strong mechanical shock, impact or vibration to the detector by dropping or bumping. Failure to do so may impair the performance of the detector. Do not install the detector in the following conditions.
  • Page 9 Space for Mounting hole Sensor cover to slide Mounting hole Mounting hole Cable entry Dimensions are in mm. Wall-mount the detector using two M5 mounting screws (pitch: 134) according to the following procedure. 1. Open the screw cover. 2. Loosely install the mounting screw (top). 3.
  • Page 10 5. Slide the cover up (cover is open). 6. Firmly tighten the mounting screw (bottom) to secure the detector to the wall. 7. Slide the cover down (cover is closed). 7. Slide the cover down 5. Slide the cover up 6.

  • Page 11: Wiring

    6. Wiring WARNING Remove any power source during wiring work to prevent electric shocks. After wiring is completed, close the detector s cover to prevent electric shocks. CAUTION New Cosmos is not responsible for the cost or any damage resulting from controlling external equipment (e.g., interlock) by using the oxygen concentration outputs (e.g., analog output, alarm relay contact output) from this product.

  • Page 12: Pin Terminal/Insulating Sleeve Installation

    6-1. Pin Terminal/Insulating Sleeve Installation Recommended parts/tools Part Model (Manufacturer) Description Shielded cable (with 0.5-1.25 mm wires) Electric cable Outer diameter: 10.5 mm or less (Included in package) Pin terminal TC1.25-16 (Nichifu) Used for 0.25-1.65 mm twisted wire Insulating sleeve VC1.25 (Nichifu) (Included in package) Crimping tool...

  • Page 13: Wire Connection/Disconnection To/From Terminal Block

    6-2. Wire Connection/Disconnection to/from Terminal Block 6-2-1. Power Terminal Block (Disconnection) (Connection) Insert each pin terminal to its While pressing the release button with a corresponding slot on the terminal block. precision screwdriver (recommended tip thickness: 2.6 mm), lift the pin terminal. 6-2-2.

  • Page 14: Ac Power Cable (Pc0125) Wiring Procedure

    6-4. AC Power Cable (PC0125) Wiring Procedure 1. Make a cutout (cable entry) on the bottom of 2. Install a cable tie by feeding it through the the unit with a nipper. tie holder and make a loop. Note: The knockout holes for cable entry are provided on the back and bottom of the unit, and either can be used as cable entry.

  • Page 15: Operation

    7. Operation 7-1. Precautions before Use WARNING Before tuning on the unit, confirm that the power supply is: 24 VDC±10% when DC power is used. 100 VAC±10% and 50/60Hz±10% when AC power is used. CAUTION Before turning on the unit, check that all wiring is correct. (Refer to 6. Wiring or delivery specifications if provided.) Turn on the unit in clean air.
  • Page 16 4) Press and hold the POWER button for 3 seconds to turn on the detector (two beeps). The three green LEDs inside the status indicator start flashing and -- -- -- -- is displayed on the LCD. The warm-up cycle lasts 30 seconds. Warm-up cycle Normal operation 5) When the warm-up cycle is completed, the three green flashing LEDs inside the status indicator...

  • Page 17: Lcd Operation

    7-3. LCD Operation 7-3-1. LCD Item Icon/Display Description/Function Audio alarm icon Always present AL1 icon 1st stage gas alarm notification AL2 icon 2nd stage gas alarm notification Sensor replacement icon Sensor needs to be replaced Backup battery icon Unit is operating on the backup battery Battery level of the backup battery used during power Backup battery level indicator outage...

  • Page 18: Full Scale And Alarm Set Values Display

    7-3-3. Full Scale and Alarm Set Values Display Press the RESET button (one beep) to display the full scale concentration , 1st stage gas alarm set value , and 2nd stage gas alarm set value in sequence. Full scale: 25.0 vol% 1st stage gas alarm set value: 19.0 vol% 2nd stage gas alarm set value: 18.0 vol% 7-3-4.

  • Page 19: User Mode

    < 1 stage alarm > Amber AL1 alarm LED flashes and the status indicator sequentially-flashes amber. Audio alarm beep: Fast, high and low beep tones. ZA1 alarm relay contact is closed. (When normally open contacts are used) < 2 stage alarm > Red AL2 and A1 alarm LEDs flash and the status indicator sequentially-flashes red.

  • Page 20: Switching Maintenance Mode On/Off [Mode1]

    7-4-2. Switching Maintenance Mode On/Off [Mode1] WARNING During the Maintenance mode, the external relay contacts and audio alarm are disabled. Turn off the Maintenance mode during normal operation. 1) Enter the User mode. Press the button to select 1 . MT and 1 will be alternately displayed.

  • Page 21: Zero Adjustment [Mode 2]

    7-4-3. Zero Adjustment [Mode 2] CAUTION On-site zero adjustment is not necessary as units have been zeroed when shipped out. 7-4-4. Span Adjustment (21.0vol% Adjustment) [Mode 3] CAUTION Perform a span adjustment in clean air. 1) Press the button to select 3 (each press of the button is followed by one beep).

  • Page 22: Alarm Test [Mode 4]

    7-4-5. Alarm Test [Mode 4] When an alarm test is executed, the alarm test value (concentration) will be displayed on the LCD, and corresponding analog output and alarm outputs (external relay contacts, audio alarm, alarm LEDs) will activate. This will allow the user to test the alarm operation. If the unit is in the Maintenance mode, the external relay contacts and audio NOTE alarm are disabled (alarm LEDs and analog outputs are active).

  • Page 23: Alarm History [Mode 5]

    7-4-6. Alarm History [Mode 5] Up to the 10 most recent alarm events can be displayed (automatically updated). For each alarm event, the following sequence of information is displayed: peak value (vol%) during the alarm, starting and ending times (year/month/day/time) of the alarm. Press the RESET button to return to the previous screen.

  • Page 24: Clock Setting [Mode 6]

    6) Press the RESET button (one beep) to display the selected alarm event number H * . To display other alarm event, repeat Steps 3) to 5). (Ex. H1 is selected ) To delete the alarm history, select INIT in Step 3), then press and hold the maintenance button for 3 seconds (beep pattern: short long short short).

  • Page 25: Maker Mode

    7-5. Maker Mode All the items set in the Maker mode (e.g., alarm set value) are password-protected. WARNING Incorrect settings in the Maker mode may change the detector s specifications. Never operate in a way other than as described in this instruction manual. Only a selected administrator should have the authority to make changes in the Maker mode.

  • Page 26: Alarm Set Value Change

    3) Press the maintenance button (one beep). 4mA will be displayed. Use a rounded pin (e.g., precision NOTE screwdriver) pressing maintenance button. 4) Press the button (one beep). The total operating time will be displayed in hex notation. WARNING Before moving total operating (Ex.
  • Page 27 1) Use the button (one beep) to select the alarm stage. Each press of the button NOTE alternates between AL 1 and AL 2 . stage alarm) stage alarm) 2) Press the maintenance button (one beep) to confirm the selection. The current alarm set value for the selected alarm stage will be displayed.

  • Page 28: Maintenance

    8. Maintenance Daily checks are carried out by the user, while monthly and annual inspections are performed by the user, New Cosmos or its authorized representative. Important Notice for Maintenance In order to ensure the reliability of the gas detector, it is vital to perform periodic sensor replacement.
  • Page 29 3) Alarm Test Check that an alarm activates correctly by referring to 7-4-5. Alarm Test . CAUTION Perform an alarm test in accordance with the applicable local laws and regulations. For example, the applicable law in Japan specifies that alarm activation must be checked by performing a circuit check once every month.

  • Page 30: Sensor/Backup Battery/Clock Battery Replacement

    8-2. Sensor/Backup Battery/Clock Battery Replacement CAUTION Use a CR2 lithium battery, cylindrical type for backup battery. Use a CR2032 lithium battery, coin type for clock battery. 1. Press and hold the POWER button for 3 seconds to turn off the detector. 2.
  • Page 31 8. Temporarily hang the cover on the top of the case by engaging the cover s Part E into the case s Part D. Top of the case Part E Top of the cover Part D Engaged 8. Hang 9. Remove backup battery Leave more than 3 seconds 10.
  • Page 32 CAUTION Horizontally install the oxygen sensor so that its connector pins are horizontally inserted into the sensor socket s pin holes. Forced insertion from the side may damage the socket, which will cause a poor connection. Good Not good Sensor socket Oxygen sensor Place the sensor in place so that its connector pins (+) (-) and the socket s pin holes (+) (-) on...

  • Page 33: Troubleshooting

    9. Troubleshooting Before requesting repair, please refer to the table below. If the detector does not return to normal operation after performing the corresponding steps in the table, or if your issue is not found in the table, consult New Cosmos or its authorized representative. Problem Probable cause Solution...
  • Page 34 Problem Probable cause Solution Reference section Replace the sensor with a new one. 8-1. 5) Sensor To mute the audio alarm, Sensor replacement Total operating time has Replacement press he RESET button. icon displayed on LCD reached one year, and the The muted audio alarm will Once a minute sensor sensor replacement alert is...

  • Page 35: Specifications

    10. Specifications Detection principle Galvanic cell sensor Sampling method Diffusion type Target gas Oxygen Detection range 0-25.0vol% or 0-50.0vol% Display Four-digit LCD with backlight, resolution 0.1vol% F.S.25vol%: 19vol% (AL1, lower limit) and 18vol% (AL2, lower limit) Alarm set value F.S.50vol%: 18vol% (AL1, lower limit ) and 25vol% (AL2, upper limit) +/- 0.7vol% (when indication is 25vol% and lower) Indication accuracy +/- 3.0vol% (when indication is 25.1vol% and higher)

  • Page 36: Warranty

    11. Warranty The warranty period is one (1) year from the date of purchase. You are entitled to the limited warranty, if the product malfunctions due to a manufacturing defect during normal use in accordance with the instruction manual, specifications and labels. Warranty Scope If the product fails or is found to be damaged due to a manufacturing defect during the warranty period, and used in accordance with the instruction manual and specifications, we will provide a free...

  • Page 37: Detection Principle

    13. Detection Principle Galvanic Cell Sensor The sensor consists of two electrodes, a membrane and an electrolyte. To accelerate reactions of gas in the atmosphere on the electrodes, the membrane is designed to adhere tightly to the electrodes. The electrodes are two different metals, noble metal (Pt, Ag) and base metal (Pb). The noble metal electrode has contact with air via a Teflon membrane.

  • Page 38: Glossary

    14. Glossary Term Definition Clean air or Standard atmosphere which contains 20.9 to 21.0% oxygen in dry condition or normal air atmosphere without target gas or interference gases. Gas detector Device used to detect the presence of a target gas and to give its concentration in the form of an electrical signal.

  • Page 39: Proper Product Disposal At End Of Life

    15. Proper Product Disposal at End of Life The Waste Electrical and Electronic Equipment WEEE directive 2012/19/EU is intended to promote recycling of electrical and electronic equipment and their components at end of life. This symbol crossed-out wheeled bin indicates separate collection of waste electrical and electronic equipment in the EU countries.
  • Page 40 December 2020 GAE-052-05 September 2022 GAE-052-06 June 2023 Additional copies of this instruction manual may be purchased. Contact New Cosmos or its authorized representative for ordering. Authorized representative: Manufacturer: NEW COSMOS ELECTRIC CO., LTD. 2-5-4 Mitsuya-naka, Yodogawa-ku, Osaka 532-0036, Japan www.newcosmos-global.com...

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