Riken Keiki GW-3 Technical Manual
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Riken Keiki GW-3 Technical Manual

Portable gas monitor
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PT0E-1930
Portable Gas Monitor
GW-3
Technical Manual
（PT0-188）
2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744, Japan
Website: http://www.rikenkeiki.co.jp/

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  • Page 1 PT0E-1930 Portable Gas Monitor GW-3 Technical Manual （PT0-188） 2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744, Japan Website: http://www.rikenkeiki.co.jp/...

  • Page 2: Table Of Contents

    Contents Contents 1. Product Overview ..............................5 1-1. Introduction ..............................5 1-2. Intended use ..............................7 1-3. DANGER, WARNING, CAUTION, and NOTE ....................8 2. Important Safety Information ............................ 9 2-1. Danger information ............................9 2-2. Warning information ............................11 2-3.
  • Page 3 Contents 5-6. Checking the gas concentration, alarm setpoints, etc. (display mode) ............48 5-6-1. Procedure for displaying display mode ....................48 5-6-2. Items displayed in display mode ......................49 5-7. Turning off the power ............................. 54 6. User Mode Settings ............................... 55 6-1.
  • Page 4 Contents 6-14. ROM/SUM display (ROM/SUM) ........................88 7. Maintenance ................................89 7-1. Maintenance intervals and maintenance items ....................89 7-2. Performing calibration ............................ 91 7-2-1. Preparation for calibration ........................91 7-2-2. Displaying the calibration (GAS CAL) screen ..................96 7-2-3. Performing air calibration ........................97 7-2-4.

  • Page 5: Product Overview

    The contents of this manual are subject to change without notice to allow product improvements. Any duplication or reproduction of this manual without permission is prohibited, whether in whole or in part. Riken Keiki accepts no liability for accidents or damage resulting from use of the product, whether within or outside the warranty period.
  • Page 6 GW-3 (CX) Operating procedures and specifications for which no icons appear apply to all models. In cases without significant differences from model to model, the display examples are taken from the GW-3 (CO) (detection target gas: CO (carbon monoxide)). 6 / 137...

  • Page 7: Intended Use

    Check the specifications before use to confirm the correct gases will be detected in accordance with the intended purpose. <List of detection target gases by model> Model Detection target gas GW-3 (O2) Oxygen(Galvanic cell type) GW-3 (OX) Oxygen(Electrochemical type) GW-3 (CO)

  • Page 8: Danger, Warning, Caution, And Note

    1. Product Overview 1-3. DANGER, WARNING, CAUTION, and NOTE 1-3. DANGER, WARNING, CAUTION, and NOTE This operating manual uses the following categories to indicate potential damage/hazards if the user disregards the information provided and uses the product incorrectly: This indicates situations in which improper handling may result in fatal or serious injury DANGER or significant property damage.

  • Page 9: Important Safety Information

    2. Important Safety Information 2-1. Danger information Important Safety Information To maintain the performance of the product and to ensure safe use, always observe the following DANGER, WARNING, and CAUTION instructions. 2-1. Danger information DANGER Explosion-proofing • Do not modify or alter the circuitry or configuration. •...
  • Page 10 2. Important Safety Information 2-1. Danger information • The ratings are as follows: ・ Japan models: Power supply: 3 V DC, 1 mA (using one Murata CR2450 battery) −20 °C to +60 °C Ambient temperature: ・ Export models: Power supply: 3 V DC, 1 mA (using one Murata CR2450, Sony CR2450B, or Duracell DL2450 battery) −20 °C to +60 °C...

  • Page 11: Warning Information

    Calibration gas must be used by itself. Calibration can be performed with a gas mixture. However, calibrations performed with a gas mixture will result in poor sensitivity and inaccurate concentration readings. But, in the calibration of GW-3(CX), nitrogen and carbon monoxide can use not only itself but also the mixed gases.
  • Page 12 2. Important Safety Information 2-2. Warning information Sensor handling • Never disassemble the electrochemical type sensor inside the product. Contact with the electrolyte inside the sensor may result in skin inflammation. Contact with eyes may result in blindness. Contact with clothing may result in discoloration or holes. If contact with electrolyte occurs, rinse the area immediately with plenty of water.
  • Page 13 2. Important Safety Information 2-2. Warning information WARNING Handling the calibration gas • The carbon monoxide sensor with hydrogen compensation must be calibrated separately for carbon monoxide and hydrogen. • If hydrogen sensitivity calibration is not performed, carbon monoxide readings may be inaccurate due to hydrogen interference.

  • Page 14: Caution Information

    2. Important Safety Information 2-3. Caution information 2-3. Caution information CAUTION Do not use the product in locations where it may be exposed to oil, chemicals, or other such substances. Avoid deliberately submerging the product in water. • Do not use the product in locations where it may be exposed to oil, chemicals, liquids, or other such substances.
  • Page 15 2. Important Safety Information 2-3. Caution information GW-3(O2): Temperature: −20 °C to +50 °C Humidity: 10 %RH to 90 %RH Continuous use environment: GW-3(OX),GW-3(HS),GW-3(CO),GW-3(C-),GW-3(CX): Temperature: −20 °C to +50 °C Humidity: 10 %RH to 90 %RH Continuous use environment: Temperature: −20 °C to +60 °C Humidity: 0 %RH to 95 %RH Temporary use environment: •...
  • Page 16 Storage • If the product will not be used for extended periods, store with the battery removed. Battery leaks may result in fire or injury. *1 GW-3(O2):30 minutes / GW-3(OX),GW-3(HS),GW-3(CO),GW-3(C-),GW-3(CX):10 minutes *2 GW-3(O2),GW-3(HS),GW-3(CO),GW-3(C-):5 minutes / GW-3(OX),GW-3(CX):10 minutes 16 / 137...
  • Page 17 2. Important Safety Information 2-3. Caution information CAUTION Gas alarm activation • If sensor has been exposed to high concentrations of gas (including the detection target gas or interference gas), it may take several minutes, or even several hours, for the display readout to return to zero (or 20.9 %).

  • Page 18: Safety Information

    2-4. Safety information overnight or longer in a location with sufficient humidity, then perform calibration once again. If it is not possible to perform CO sensitivity calibration, contact Riken Keiki to request sensor replacement. 2-4. Safety information This gas monitor is portable and is available as a single-gas monitor or a two-gas monitor.
  • Page 19 2. Important Safety Information 2-4. Safety information <List of standards>  IEC 60079-0:2017 ・ EN60079-0:2012+A11:2013  IEC 60079-11:2011 ・ EN60079-0:2018 ・ EN60079-11:2012 <Guidelines>  JNIOSH-TR-46-1:2015  JNIOSH-TR-46-6:2015 19 / 137...
  • Page 20 2. Important Safety Information 2-4. Safety information WARNING • Do not replace batteries in hazardous location. • Do not disassemble or alter the product. • Use only one CR2450 lithium manganse dioxide battery by Murata, CR2450B by Sony, or DL2450 by Duracell (CR2450 by Murata only for Japan models).

  • Page 21: Product Configuration

    3-1. Main unit and accessories Product Configuration 3-1. Main unit and accessories Open the box and packaging and inspect the main unit and accessories. If anything is missing, contact Riken Keiki. <Main unit and standard accessories> Main unit Standard accessories...
  • Page 22 3. Product Configuration 3-1. Main unit and accessories <Optional items (sold separately)>  Dust filter  Filters GW-3 (CO), GW-3 (C-) : Filter CF-1821 GW-3 (CX) : Filter CF-6280 GW-3 (HS) : Humidity control filter CF-A13i-1  Leather case  Heat-resistant case ...

  • Page 23: Part Names And Functions

    3. Product Configuration 3-2. Part names and functions 3-2. Part names and functions 3-2-1. Main unit ① Alarm lamp/ Infrared communication port ② Buzzer sound ⑦ Battery cover opening Battery cover ③ LCD display retaining screw ⑥ Sensor Sensor cap ④...

  • Page 24: Lcd Display

    3. Product Configuration 3-2. Part names and functions Name Function ⑤ POWER/MODE button Turns the power on/off. Confirms operations when in user mode, etc. ⑥ Sensor The sensor for detecting gas is installed. ⑦ Battery cover Cover protecting the battery * The data logger management program is sold separately.
  • Page 25 3. Product Configuration 3-2. Part names and functions Name Function Indicates the operating status in measurement mode. Blinks when normal. The blinking interval changes from approximately once ③ Operating status display every second to approximately once every two seconds if no operation is performed for about 30 seconds.

  • Page 26: Inserting The Battery

    3. Product Configuration 3-3. Inserting the battery 3-3. Inserting the battery When using the product for the first time or when battery levels are low, install a new (CR2450) battery. 1 Confirm that the power for the product is turned off. If the power is on, hold down the POWER/MODE button for at least three seconds to turn off the power.
  • Page 27 3. Product Configuration 3-3. Inserting the battery DANGER • If the product is used as an explosion-proof device, note that the explosion-proofing rating conditions specify the battery type to be used. The battery types are as follows: ・ Japan models: One CR2450 (Murata) ・...
  • Page 28 3. Product Configuration 3-3. Inserting the battery CAUTION • Be sure to turn off the power for the product before replacing the battery. • When replacing the battery, always replace with a new battery. • Note the polarity when inserting a battery. •...

  • Page 29: Alarm Functions

    4. Alarm Functions 4-1. Gas alarm types and alarm setpoints Alarm Functions 4-1. Gas alarm types and alarm setpoints A gas alarm is triggered if the concentration of the detected gas reaches or exceeds the alarm setpoints shown in the following table. (Self-latching) Gas alarm types include the first alarm (WARNING), second alarm (ALARM), third alarm (ALARM H), and OVER alarm (OVER).
  • Page 30 4. Alarm Functions 4-1. Gas alarm types and alarm setpoints A gas alarm is triggered if the concentration of the detected gas reaches or exceeds the alarm setpoints shown in the following table. (Japan models: Auto reset/Export models: Self-latching) Gas alarm types include the first alarm (WARNING), second alarm (ALARM), third alarm (ALARM H), STEL alarm (STEL), integrated alarm (A-1H) or TWA alarm (TWA) , and OVER alarm (OVER).
  • Page 31 4. Alarm Functions 4-1. Gas alarm types and alarm setpoints A gas alarm is triggered if the concentration of the detected gas reaches or exceeds the alarm setpoints shown in the following table. (Japan models: Auto reset/Export models: Self-latching) Gas alarm types include the first alarm (WARNING), second alarm (ALARM), third alarm (ALARM H), STEL alarm (STEL), integrated alarm (A-1H) or TWA alarm (TWA) , and OVER alarm (OVER).

  • Page 32: Gas Alarm Activation

    4. Alarm Functions 4-2. Gas alarm activation 4-2. Gas alarm activation <Buzzer and alarm lamp patterns> When a gas alarm occurs, the user will be alerted by the audible buzzer, flashing alarm lamp, and vibration. The behavior differs depending on the type of alarm. Second Integrated Alarm...
  • Page 33 4. Alarm Functions 4-2. Gas alarm activation <Gas alarm display> When a gas alarm occurs, the alarm type is indicated on the LCD display and the corresponding gas concentration display blinks. Display example: Carbon monoxide (CO) concentration: 200 ppm when the third alarm is triggered NOTE If the gas detection range is exceeded (over scale), [OVER] appears on the LCD display, and [∩∩∩∩] will ...

  • Page 34: Fault Alarm Activation

    If a fault alarm occurs, determine the cause and take appropriate action. If the problem lies with the product and the fault occurs repeatedly, contact Riken Keiki immediately. In the event of a fault alarm, the user will be alerted by the audible buzzer and flashing alarm lamp.

  • Page 35: Outside Operating Temperature Range Warning

    4-4. Outside operating temperature range warning 4-4. Outside operating temperature range warning If the product (other than the GW-3 (O2)) is used for 20 minutes or longer outside the operating temperature range, an outside operating temperature range warning (temperature range error) occures.

  • Page 36: Usage Instrucions

    5. Usage Instrucions 5-1. Usage note Usage Instrucions 5-1. Usage note Observe all usage precautions when using the product. Failure to comply with these precautions may result in failure of the product or inability to perform normal gas measurement. 5-2. Preparing startup Check the following before starting gas detection: ...

  • Page 37: Turning On The Power

    5. Usage Instrucions 5-3. Turning on the power 5-3. Turning on the power Turn the power on and start the product. When the power is turned on, various information, including date and time and alarm setpoints, will be displayed in sequence, followed by the measurement mode screen. 1 Hold down the POWER/MODE button (for at least three seconds).
  • Page 38 The buzzer blips twice, and the product switches to measurement mode. *Japan models: Calibration notification display/Export models: Calibration expiration display (Display example: GW-3 (CO)) Entire LCD Calibration Battery level/ Detection target Date and time display lights up. notification...
  • Page 39 *1 Japan models: Calibration notification display/Export models: Calibration expiration display *2 GW-3 (HS): TWA alarm setpoint GW-3 (CO), GW-3 (C-): Japan models: Integrated alarm setpoint/Export models: TWA alarm setpoint 39 / 137...
  • Page 40 5. Usage Instrucions 5-3. Turning on the power Entire LCD Calibration Battery level/ Detection target Date and time display lights up. notification alarm pattern gas name The buzzer blips once, and the power turns on. First gas alarm Second gas Third gas alarm STEL alarm Full scale...
  • Page 41 5-3. Turning on the power <Basic operation flow> After turning on the power, the product performs as follows when you press the AIR button or the POWER/MODE button. (Display example: GW-3 (CO)) <Air calibration> <Display mode> <Air calibration> <Display mode>...
  • Page 42 5. Usage Instrucions 5-3. Turning on the power <Air calibration> <Display mode> POWER/ <Measurement Hold down MODE mode> AIR button. button POWER/ POWER/ MODE MODE button button <Fault alarm state> <Gas alarm state> 42 / 137...

  • Page 43: Performing Air Calibration

    5. Usage Instrucions 5-4. Performing air calibration 5-4. Performing air calibration Perform air calibration before measuring gas concentration. Air calibration refers to zero adjustment required to ensure accurate measurement of gas concentrations. WARNING • When air calibration is performed in the atmosphere, check the atmosphere for freshness before starting. The presence of interference gases will prevent proper air calibration.
  • Page 44 5. Usage Instrucions 5-4. Performing air calibration CAUTION • Perform air calibration in an environment that meets all of the following conditions: ・ Pressures, temperatures, and humidity levels are similar to pressures, temperatures, and humidity levels in the actual usage environment. ・...
  • Page 45 5. Usage Instrucions 5-4. Performing air calibration NOTE  If air calibration fails, [FAIL AIR] will appear. Air calibration will not be performed. Press the POWER/MODE button to reset the fault alarm (calibration abnormality). Resetting the alarm displays the value before air calibration. ...

  • Page 46: Measuring Gas Concentration

    5. Usage Instrucions 5-5. Measuring gas concentration 5-5. Measuring gas concentration The display automatically returns to measurement mode once air calibration has been successfully completed to measure the gas concentration. The gas concentration will appear on the LCD display when measurement is complete. If the gas concentration detected reaches the alarm setpoint at this time, a gas alarm is triggered.
  • Page 47 5. Usage Instrucions 5-5. Measuring gas concentration NOTE  When the confirmation beep has been set, the buzzer sounds at the set interval during measurement. (Refer to ‘6-7. Confirmation beep setting (BEEP)’.)  The gas concentration alarm setpoints can be checked in display mode. (Refer to ‘5-6. Checking the gas concentration, alarm setpoints, etc.

  • Page 48: Checking The Gas Concentration, Alarm Setpoints, Etc. (Display Mode)

    5. Usage Instrucions 5-6. Checking the gas concentration, alarm setpoints, etc. (display mode) 5-6. Checking the gas concentration, alarm setpoints, etc. (display mode) Check measurement results. Switch to display mode to check items like maximum concentration of gas detected, alarm setpoints, date and time, and temperature.

  • Page 49: Items Displayed In Display Mode

    5-6-2. Items displayed in display mode Display LCD display Display contents item Display example: GW-3(CO) Detection Displays the name of the detection target gas. target gas [CO] (carbon monoxide) is displayed in the upper name row. [O2] (oxygen) is displayed in the middle row.
  • Page 50 AIR button until [RELEASE] appears. PEAK Displays the maximum gas concentration (or display minimum oxygen concentration of GW-3(CX)) detected since the power was turned on. (Upper You can clear the PEAK value while the PEAK limit value) display is on by holding down the AIR button until [RELEASE] appears.
  • Page 51 8 hours per day or 40 hours per week. The value is refreshed every 60 seconds. *GW-3 (HS):TWA display *GW-3 (CO), GW-3 (C-), GW-3 (CX): Japan models:Integrated (A-1H) display/ Export models: TWA display Date and Displays the current time and date.
  • Page 52 Displays alarm setpoints. Pressing the AIR button setpoint lets you change the alarm setpoint display. display 【GW-3(O2),GW-3(OX)】 Pressing the AIR button cycles through the settings in the following order: [F.S.] (FULL SCALE) → [WARNING] → [ALARM] → [ALARM H]. 【GW-3(CO),GW-3(HS),GW-3(C-)】...
  • Page 53 5. Usage Instrucions 5-6. Checking the gas concentration, alarm setpoints, etc. (display mode) *GW-3 (HS):TWA display *GW-3 (CO), GW-3 (C-): Japan models: Integrated (A-1H) display/ Export models: TWA display 【GW-3(CX)】 Pressing the AIR button cycles through the settings in the following order: [F.S.] (FULL SCALE) →...

  • Page 54: Turning Off The Power

    5. Usage Instrucions 5-7. Turning off the power NOTE  By pressing the AIR button and the POWER/MODE button at the same time while displaying any of the alarm setpoints in the alarm setpoint display of display mode, you can test the relevant alarm. (Refer to ‘7-4.

  • Page 55: User Mode Settings

    6. User Mode Settings 6-1. User mode setting procedure User Mode Settings 6-1. User mode setting procedure Set the date and time, alarm setpoints, and other settings in user mode. <Displaying user mode setting screen> Select the setting item in the user mode menu, then make the settings in the setting screen displayed. 1 Turn off the power.
  • Page 56 6. User Mode Settings 6-1. User mode setting procedure A password input screen will appear if the user mode password has been set. Press the AIR button to enter the password, then press the POWER/MODE button to display the user mode menu. 3 Press the AIR button several times to select the setting item.
  • Page 57 6. User Mode Settings 6-1. User mode setting procedure <Ending user mode> 1 When the settings are complete, press the AIR button several times to select [START], then press the POWER/MODE button. User mode ends. The product will return to measurement mode after performing the same operation as when the power is turned on.

  • Page 58: User Mode Setting Items

    6. User Mode Settings 6-2. User mode setting items 6-2. User mode setting items The following items can be set in user mode: Item LCD display Details Bump test (BUMP) Perform a bump test (function check). The bump test is a test for checking whether the readings are within the acceptable range by introducing a calibration gas.
  • Page 59 . You can also return the alarm setpoints to their setting (ALARM-P) default settings. *1 The following alarm setpoints can be set: ・ GW-3 (O2), GW-3 (OX): First to third alarm setpoints ・ GW-3 (CO), GW-3 (C-), GW-3 (CX): First to third alarm setpoints, STEL alarm setpoint, integrated alarm setpoint or TWA alarm setpoint ・...
  • Page 60 6. User Mode Settings 6-2. User mode setting items Confirmation beep Toggle the confirmation beep ON/OFF, set its behavior, and set setting intervals. (BEEP) This function provides an audible indication of whether the product is operating normally. If the bump test expiration setting (BP.RMDR) or the calibration expiration setting (CAL.RMDR) is ON, you can have this function operate when the expiration date is reached.
  • Page 61 6. User Mode Settings 6-2. User mode setting items Quick calibration Set the time for quick calibration. time setting The quick calibration function performs AUTO calibration after the (E-CAL) introduction of the calibration gas by automatically counting down the calibration time set with the quick calibration time setting (E-CAL).

  • Page 62: Calibration Expiration Setting (Cal Set)

    6. User Mode Settings 6-3. Calibration expiration setting (CAL SET) 6-3. Calibration expiration setting (CAL SET) The following items can be set in the calibration expiration setting (CAL SET). (Settings available on export models only) Calibration expiration setting (CAL SET) Calibration expiration ON/OFF (CAL.RMDR) Calibration expiration date interval (CAL.INT) Setting operation after calibration date expires (CAL.EXPD)
  • Page 63 6. User Mode Settings 6-3. Calibration expiration setting (CAL SET) 3 Press the AIR button several times to select [ON] or [OFF], then press the POWER/MODE button. [END] appears once the settings are complete. The display returns to the calibration expiration setting (CAL SET) screen.

  • Page 64: Calibration Expiration Date Interval (Cal.int)

    6. User Mode Settings 6-3. Calibration expiration setting (CAL SET) 6-3-2. Calibration expiration date interval (CAL.INT) This sets the number of days (1 to 1,000 days) for the calibration expiration for AUTO calibration. The default setting is 90 days. 1 Press the AIR button several times in user mode to select [CAL SET], then press the POWER/MODE button.

  • Page 65: Setting Operation After Calibration Date Expires (Cal.expd)

    6. User Mode Settings 6-3. Calibration expiration setting (CAL SET) 6-3-3. Setting operation after calibration date expires (CAL.EXPD) Set the operation performed when the calibration date for AUTO calibration expires. Select one of the following:  CONFIRM: The behavior differs depending on the operation. Press the AIR button to proceed to measurement mode or press the POWER/MODE button to proceed to AUTO calibration.

  • Page 66: Bump Test Expiration Setting (Bump.set)

    6. User Mode Settings 6-4. Bump test expiration setting (BUMP.SET) 3 Press the AIR button several times to select the operation after calibration date expires, then press the POWER/MODE button. Select [CONFIRM], [CANT.USE], or [NONE]. [END] appears once the settings are complete. The display returns to the calibration expiration setting (CAL SET) screen.

  • Page 67: Bump Test Setting (Setting)

    6. User Mode Settings 6-4. Bump test expiration setting (BUMP.SET) 6-4-1. Bump test setting (SETTING) Set the bump test time, bump test tolerance, ON/OFF for calibration after a bump test failure, and calibration time. <Bump test time setting (GAS.TIME)> This lets you set the time at which the calibration gas is introduced when performing a bump test. Select from 30, 45, 60, and 90 seconds.
  • Page 68 6. User Mode Settings 6-4. Bump test expiration setting (BUMP.SET) <Bump test tolerance setting (CHECK)> Set the bump test tolerance (threshold for determining pass or failure for the bump test). Select from 10, 20, 30, 40, and 50 %. The default setting is 50 %. 1 Press the AIR button several times in user mode to select [BUMP.SET], then press the POWER/MODE button.
  • Page 69 6. User Mode Settings 6-4. Bump test expiration setting (BUMP.SET) <Bump test calibration ON/OFF (A-CAL)> Set whether calibration is to be performed after a bump test fails. If this is set to ON, calibration (AUTO calibration) is performed automatically when a bump test fails. The default setting is ON.
  • Page 70 6. User Mode Settings 6-4. Bump test expiration setting (BUMP.SET) <Bump test calibration time setting (CAL.TIME)> Set the time for calibration after a bump test fails. Select from 60, 90, and 120 seconds. The default setting is 60 seconds. 1 Press the AIR button several times in user mode to select [BUMP.SET], then press the POWER/MODE button.

  • Page 71: Bump Test Expiration On/Off (Bp.rmdr)

    6. User Mode Settings 6-4. Bump test expiration setting (BUMP.SET) 6-4-2. Bump test expiration ON/OFF (BP.RMDR) This toggles the bump test expiration ON/OFF. If the setting is ON, the operation set in setting behavior after bump test expiration (BP.EXPD) is performed when the expiration date set in bump test expiration date interval setting (BP.INT) is reached.

  • Page 72: Bump Test Expiration Date Interval Setting (Bp.int)

    6. User Mode Settings 6-4. Bump test expiration setting (BUMP.SET) 6-4-3. Bump test expiration date interval setting (BP.INT) This sets the number of days (0 to 30 days) for bump test expiration. The default setting is 30 days. 1 Press the AIR button several times in user mode to select [BUMP.SET], then press the POWER/MODE button.

  • Page 73: Setting Behavior After Bump Test Expiration (Bp.expd)

    6. User Mode Settings 6-4. Bump test expiration setting (BUMP.SET) 6-4-4. Setting behavior after bump test expiration (BP.EXPD) This selects the behavior after the bump test expiration date. Select one of the following:  CONFIRM: The behavior differs depending on the operation. Press the AIR button to proceed to measurement mode or press the POWER/MODE button to proceed to the bump test.
  • Page 74 6. User Mode Settings 6-4. Bump test expiration setting (BUMP.SET) 3 Press the AIR button several times to select the behavior after expiration, then press the POWER/MODE button. Select [CONFIRM], [CANT.USE], or [NONE]. [END] appears once the settings are complete. The display returns to the bump test expiration setting (BUMP.SET) screen.

  • Page 75: Alarm Setpoint Setting (Alarm-P)

    6. User Mode Settings 6-5. Alarm setpoint setting (ALARM-P) 6-5. Alarm setpoint setting (ALARM-P) This is used to set alarm setpoints. You can also return the alarm setpoints to their default settings. 6-5-1. Alarm setpoint setting <Alarm setpoint setting range> Alarm setpoints can be set to the specified number of digits.
  • Page 76 6. User Mode Settings 6-5. Alarm setpoint setting (ALARM-P) Detection target gas 1 digit Lower limit Upper limit 1 ppm (0 to 300 ppm) Carbon monoxide 20 ppm 2,000 ppm 10 ppm (CO) (300 to 2,000 ppm) Detection target gas 1 digit First/second alarm Third alarm...
  • Page 77 GW-3 (O2), GW-3 (OX): First alarm setpoint → Second alarm setpoint → Third alarm setpoint GW-3 (CO), GW-3 (C-), GW-3 (CX): First alarm setpoint → Second alarm setpoint → Third alarm setpoint → STEL alarm setpoint → Integrated alarm setpoint or TWA alarm setpoint GW-3 (HS): First alarm setpoint →...

  • Page 78: Resetting Alarm Setpoints (Def.almp)

    6. User Mode Settings 6-5. Alarm setpoint setting (ALARM-P) 6-5-2. Resetting alarm setpoints (DEF.ALMP) This restores alarm setpoints to their default settings. For more information on default settings for alarm setpoints, see ‘4-1. Gas alarm types and alarm setpoints’. 1 Press the AIR button several times in user mode to select [ALARM-P], then press the POWER/MODE button.

  • Page 79: Lunch Break On/Off (Lunch)

    The default setting is OFF. The retained gas concentration values are as follows:  GW-3 (O2), GW-3 (OX): PEAK value  GW-3 (CO), GW-3 (C-), GW-3 (CX): Integrated value or TWA value , PEAK value  GW-3 (HS): TWA value, PEAK value...

  • Page 80: Confirmation Beep Setting (Beep)

    6. User Mode Settings 6-7. Confirmation beep setting (BEEP) 6-7. Confirmation beep setting (BEEP) This function provides an audible indication of whether the product is operating normally while measuring gas concentrations. The following items can be set in the confirmation beep setting (BEEP): Confirmation beep setting (BEEP) Beep operation setting (BEEP.SEL) Beep interval setting setting (BEEP.INT)

  • Page 81: Beep Interval Setting (Beep.int)

    6. User Mode Settings 6-7. Confirmation beep setting (BEEP) 3 Press the AIR button several times to select the behavior of the confirmation beep, then press the POWER/MODE button. Select [OFF], [LED], [BUZZER], [LED+BUZ], or [BMP/CAL]. [END] appears once the settings are complete. The display returns to the confirmation beep setting (BEEP) screen.

  • Page 82: Lcd Lighting Time Setting (Bl Time)

    6. User Mode Settings 6-8. LCD lighting time setting (BL TIME) 6-8. LCD lighting time setting (BL TIME) Set the duration for which the LCD backlight remains lit. Set the LCD lighting time to OFF or to a value from 1 to 255 seconds. The default setting is 30 seconds. 1 Press the AIR button several times in user mode to select [BL TIME], then press the POWER/MODE button.

  • Page 83: Key Operation Tone On/Off (Key.tone)

    6. User Mode Settings 6-9. Key operation tone ON/OFF (KEY.TONE) 6-9. Key operation tone ON/OFF (KEY.TONE) Select ON/OFF for the key operation tone when you press the AIR button or the POWER/MODE button. If this setting is set to ON, the key operation tone will sound when you press the AIR button or the POWER/MODE button.

  • Page 84: Display Mode Item Display On/Off (Disp.set)

    6. User Mode Settings 6-10. Display mode item display ON/OFF (DISP.SET) 6-10. Display mode item display ON/OFF (DISP.SET) You can select whether to display or hide items that can be set in display mode (buzzer volume setting). If this is set to OFF, the items that can be set in display mode (buzzer volume setting) will not be displayed. The default setting is ON.

  • Page 85: Quick Calibration Time Setting (E-Cal)

    The function is enabled when set to any setting other than OFF. Select a time from 1 to 180 seconds for quick calibration.  GW-3(CO)、GW-3(C-)、GW-3(CX) Japan models：60 秒  Models other than the above：OFF 1 Press the AIR button several times in user mode to select [E-CAL], then press the POWER/MODE button.

  • Page 86: Date And Time Setting (Date)

    6. User Mode Settings 6-12. Date and time setting (DATE) 6-12. Date and time setting (DATE) Set the date and time for the internal clock. 1 Press the AIR button several times in user mode to select [DATE], then press the POWER/MODE button.

  • Page 87: User Mode Password Setting (Pass-W)

    6. User Mode Settings 6-13. User mode password setting (PASS-W) 6-13. User mode password setting (PASS-W) Set a password when transitioning to user mode. If the setting is ON, access to user mode is password-protected and a password input screen is displayed when the user seeks to enter user mode.

  • Page 88: Rom/Sum Display (Rom/Sum)

    6. User Mode Settings 6-14. ROM/SUM display (ROM/SUM) 6-14. ROM/SUM display (ROM/SUM) This displays the program number and SUM value of the product. This is normally not set or adjusted by the user. 1 Press the AIR button several times in user mode to select [ROM/SUM], then press the POWER/MODE button.

  • Page 89: Maintenance

    7. Maintenance 7-1. Maintenance intervals and maintenance items Maintenance The product is an important safety and disaster-prevention device. Perform product maintenance at regular intervals to ensure performance and to improve disaster-prevention and safety reliability. 7-1. Maintenance intervals and maintenance items Maintain the following items at regular intervals: ...
  • Page 90 If you encounter a product abnormality, contact Riken Keiki immediately. NOTE  Calibration requires dedicated tools and the preparation of a calibration gas. Contact Riken Keiki before performing calibration.  The built-in sensor has an expiration date and must be replaced regularly.

  • Page 91: Performing Calibration

    The product can be calibrated using AUTO calibration with preset gas concentrations, in addition to air calibration performed in the atmosphere. Calibration requires dedicated tools and a calibration gas. Contact Riken Keiki before performing calibration. 7-2-1. Preparation for calibration Prepare the following equipment and calibration gases, then connect to this product: <Required equipment>...
  • Page 92 7. Maintenance 7-2. Performing calibration <Connecting the equipment> Before performing calibration, attach the calibration adapter, connect as shown below, then adjust the flow of the calibration gas to 250 ±10 mL/min. Connect the gas sampling bag when the gas concentration display is blinking ([A-CAL] and [APPLY] alternate on the display) during AUTO calibration.
  • Page 93 7. Maintenance 7-2. Performing calibration WARNING Handling the calibration gas • The calibration gas is nitrogen. Inhaling the gas may lead to loss of health or even death. When using calibration gas, discharge outside, perform calibration in a well-ventilated area, or use local ventilation equipment.
  • Page 94 7. Maintenance 7-2. Performing calibration WARNING Handling the calibration gas • The calibration gas (carbon monoxide) is toxic. Inhaling the gas may lead to loss of health or even death. When using calibration gas, discharge outside, perform calibration in a well-ventilated area, or use local ventilation equipment.
  • Page 95 7. Maintenance 7-2. Performing calibration WARNING Handling the calibration gas • The calibration gas (carbon monoxide) is toxic. Inhaling the gas may lead to loss of health or even death. When using calibration gas, discharge outside, perform calibration in a well-ventilated area, or use local ventilation equipment.

  • Page 96: Displaying The Calibration (Gas Cal) Screen

    (Refer to ‘6-1. User mode setting procedure’.)  Following successful calibration, the product will automatically return to measurement mode. However, if multiple cylinders are set (GW-3 (C-) and GW-3 (CX) only), the product will not automatically return to measurement mode. ...

  • Page 97: Performing Air Calibration

    7. Maintenance 7-2. Performing calibration 7-2-3. Performing air calibration WARNING • When air calibration is performed in the atmosphere, check the atmosphere for freshness before starting. The presence of interference gases will prevent proper air calibration. The presence of interference gases is also extremely dangerous because the product may not detect actual gas leaks correctly.
  • Page 98 7. Maintenance 7-2. Performing calibration CAUTION • Perform air calibration in an environment that meets all of the following conditions: ・ Pressures, temperatures, and humidity levels are similar to pressures, temperatures, and humidity levels in the actual usage environment. ・ In fresh air •...
  • Page 99 7. Maintenance 7-2. Performing calibration 4 Release the AIR button once the LCD display changes from [Air HOLD] to [AdJ RELEASE]. When air calibration succeeds, [PASS] appears. After air calibration, the current gas concentration appears, and the display returns to the calibration (GAS CAL) screen.

  • Page 100: Performing Auto Calibration

    7. Maintenance 7-2. Performing calibration 7-2-4. Performing AUTO calibration Introduce the calibration gas and perform calibration at the gas concentration set in the calibration gas concentration setting (CAL-P). CAUTION • Air calibration must always be performed before AUTO calibration. <Performing AUTO calibration (A-CAL)> 1 Press the AIR button several times in user mode to select [GAS CAL], then press the POWER/MODE button.
  • Page 101 If AUTO calibration fails [FAIL] appears. <Performing AUTO calibration (A-CAL)> (Display example: GW-3 (CO)) 1 Press the AIR button several times in user mode to select [GAS CAL], then press the POWER/MODE button. 2 Press the AIR button to select [A-CAL], then press the POWER/MODE button.
  • Page 102 7. Maintenance 7-2. Performing calibration 4 Introduce the calibration gas, wait 60 seconds, then press the POWER/MODE button. AUTO calibration starts. 5 Check the AUTO calibration result. If AUTO calibration is successful [PASS] appears, followed by the gas concentration after AUTO calibration. After this, the product returns automatically to measurement mode.
  • Page 103 7. Maintenance 7-2. Performing calibration <Performing AUTO calibration (A-CAL)> (Display example: GW-3 (CX)) 1 Press the AIR button several times in user mode to select [GAS CAL], then press the POWER/MODE button. 2 Press the AIR button to select [A-CAL], then press the POWER/MODE button.
  • Page 104 7. Maintenance 7-2. Performing calibration 5 Check the AUTO calibration result. If AUTO calibration is successful [PASS] appears, followed by the gas concentration after AUTO calibration. After this, the product returns automatically to measurement mode. If AUTO calibration fails [FAIL] appears. NOTE ...
  • Page 105 7. Maintenance 7-2. Performing calibration <Calibration gas concentration setting (CAL-P)> 1 Press the AIR button several times in user mode to select [GAS CAL], then press the POWER/MODE button. 2 Press the AIR button several times to select [A-CAL], then press the POWER/MODE button.
  • Page 106 7-2. Performing calibration <Cylinder setting (CYL SEL)> Set gas groups (cylinders) for calibration. Five cylinders can be set as A to E. The default settings are as follows: GW-3 (C-): CO: A, H2: B GW-3 (CX): CO: A, O2: A NOTE ...
  • Page 107 POWER/MODE button. Pressing the AIR button cycles through the detection target gases. [CO] → [H2] → [ESCAPE] GW-3 (C-): [CO] → [O2] → [ESCAPE] GW-3 (CX): Selecting [ESCAPE] and pressing the POWER/MODE button returns the display to the AUTO calibration (A-CAL) screen.

  • Page 108: Performing Bump Tests

    (Refer to ‘6-1. User mode setting procedure’.)  Following a successful bump test, the product will automatically return to measurement mode. However, if multiple cylinders are set (GW-3 (C-) and GW-3 (CX) only), the product will not automatically return to measurement mode. ...
  • Page 109 7. Maintenance 7-3. Performing bump tests 2 Introduce the calibration gas, then press the POWER/MODE button. [APLY] and [BUMP] alternate on the display. The time until the bump test starts is displayed on the right side. The bump test starts when the remaining time reaches [0].
  • Page 110 4 Press the POWER/MODE button. [END] appears. If the bump test is successful, the product will automatically return to measurement mode. (Display example: GW-3 (CO)) 1 Press the AIR button several times in user mode to select [BUMP], then press the POWER/MODE button.
  • Page 111 7. Maintenance 7-3. Performing bump tests If the bump test failed [F] appears in the [BMP/CAL] screen (left side of middle row). Press the AIR button to view the reading at the time of the bump test. After a bump test failure, calibration is performed Left side of middle row: (Displayed only if calibration was...
  • Page 112 7. Maintenance 7-3. Performing bump tests (Display example: GW-3 (CX)) 1 Press the AIR button several times in user mode to select [BUMP], then press the POWER/MODE button. 2 Press the AIR button several times to select the cylinder for the bump test, then press the POWER/MODE button.
  • Page 113 7. Maintenance 7-3. Performing bump tests If the bump test failed [F] appears in the [BMP/CAL] screen (left side). Press the AIR button to view the reading at the time of the bump test. After a bump test failure, calibration is performed (Left side of upper row: (Displayed only if CO bump test result)

  • Page 114: Performing Alarm Tests

    7. Maintenance 7-4. Performing alarm tests 7-4. Performing alarm tests By pressing the AIR button and the POWER/MODE button at the same time while displaying any of the alarm setpoints in the alarm setpoint display of display mode, you can test the relevant alarm. 1 Press the POWER/MODE button in measurement mode.
  • Page 115 7. Maintenance 7-4. Performing alarm tests NOTE  For information on the alarm patterns at the different alarm setpoints, see ‘4-2. Gas alarm activation’.  The gas concentration on the LCD display will not blink in alarm tests.  To end display mode, press the POWER/MODE button, select the buzzer volume setting screen, then press the POWER/MODE button.

  • Page 116: Cleaning Instructions

    7. Maintenance 7-5. Cleaning instructions 7-5. Cleaning instructions Clean the product if it becomes excessively dirty. Be sure to turn off the power before cleaning. Wipe clean using a cloth or rag soaked in water and firmly wrung out. Do not clean using water, organic solvents, or commercially available cleaners for cleaning, as these may cause the product to malfunction.

  • Page 117: Parts Replacement

    7. Maintenance 7-6. Parts replacement 7-6. Parts replacement For information on parts replacement, please contact Riken Keiki. A functional check by a qualified service engineer is also required after parts replacement.For more information, contact Riken Keiki. 7-6-1. Periodic replacement parts The consumable parts of the product are listed below.

  • Page 118: Filter Replacement

    7-6. Parts replacement * A functional check by a qualified service engineer is required after replacement. To ensure safety and the stable operation of the product, request checking by a qualified service engineer. Contact Riken Keiki to request checking. CAUTION •...
  • Page 119 7. Maintenance 7-6. Parts replacement 3 Detach the sensor cap. 4 Replace the dust filter inside the product. Sensor cap 5 Reattach the sensor cap, then tighten the sensor cap retaining screw with the Phillips- Dust filter head screwdriver. Tighten the screw to a torque of 15 to 16 N∙cm with the Phillips-head screwdriver.
  • Page 120 7. Maintenance 7-6. Parts replacement The dust filter and filter (CF-1821) are consumables. Check the extent of contamination and replace them periodically at appropriate intervals. 1 Turn off the power. Hold down the POWER/MODE button for at least three seconds to turn off the power. Sensor cap retaining screw 2 Loosen the sensor cap retaining screw with a...
  • Page 121 7. Maintenance 7-6. Parts replacement The dust filter and filter (CF-6280) are consumables. Check the extent of contamination and replace them periodically at appropriate intervals. 1 Turn off the power. Hold down the POWER/MODE button for at least three seconds to turn off the power. Sensor cap retaining screw 2 Loosen the sensor cap retaining screw with a...
  • Page 122 7. Maintenance 7-6. Parts replacement The dust filter and humidity control filter (CF-A13i-1) are consumables. Check the extent of contamination and replace them periodically at appropriate intervals. 1 Turn off the power. Hold down the POWER/MODE button for at least three seconds to turn off the power.
  • Page 123 7. Maintenance 7-6. Parts replacement CAUTION • Chemicals have been applied to the filter CF-1821, the filter CF-6280 and the humidity control filter CF- A13i-1. When replacing the filters, hold with tweezers. Work carefully to avoid damaging the filters or touching with bare hands.

  • Page 124: Sensor Replacement

    7-6-3. Sensor replacement The sensor needs to be replaced if you encounter symptoms like failure to restore readings after air calibration or fluctuating readings when performing calibration. Contact Riken Keiki for replacement. Sensor cap 1 Turn off the power. retaining screw Hold down the POWER/MODE button for at least three seconds to turn off the power.
  • Page 125 7. Maintenance 7-6. Parts replacement 1 Turn off the power. Sensor cap Hold down the POWER/MODE button for at least retaining screw three seconds to turn off the power. 2 Loosen the sensor cap retaining screw with a Phillips-head screwdriver. Sensor cap 3 Detach the sensor cap.
  • Page 126 Sensor 8 Attach the dust filter and filter. The filter types are as follows: GW-3 (CO), GW-3 (C-) : Filter CF-1821 GW-3 (CX) : Filter CF-6280 GW-3 (HS) : Humidity control filter CF-A13i-1 9 Reattach the sensor cap, then tighten the sensor cap retaining screw with the Phillips- head screwdriver.

  • Page 127: Storage And Disposal

    8. Storage and Disposal 8-1. Procedures for storage or when not in use for extended periods Storage and Disposal 8-1. Procedures for storage or when not in use for extended periods The product must be stored in the following environment: ...

  • Page 128: Product Disposal

    8. Storage and Disposal 8-2. Product disposal 8-2. Product disposal Dispose of the product as industrial waste (incombustible) in accordance with local regulations. WARNING • Dispose of batteries in accordance with procedures specified by local authorities. <Disposal in EU member states> When disposing of the product in an EU member state, dispose of the battery separately.

  • Page 129: Troubleshooting

    System abnormality: A circuit abnormality occurred in Contact Riken Keiki for repair. [FAIL SYSTEM] appears. the main unit. Contact Riken Keiki to request sensor Sensor abnormality: The sensor sensitivity has replacement. [FAIL SENSOR] appears. degraded. (Refer to ‘7-6-2. Sensor replacement’.)
  • Page 130 [FAIL CLOCK] appears. be faulty. Contact Riken Keiki to request internal clock replacement. For GW-3 (O2), GW-3 (OX), GW-3 (HS) The product alarms are self-latching. After the The alarm does not stop alarm occurs, press the POWER/MODE button. even after gas...

  • Page 131: Product Specifications

    10. Product Specifications 10-1. Common specifications Product Specifications 10-1. Common specifications Concentration display LCD digital display (segments + icons) Gas alarm indications Flashing lamp, intermittent buzzer sounding, gas concentration display blinking, vibration Fault alarm/self diagnosis Sensor abnormality, low battery voltage, faulty calibration, clock abnormality, system abnormality Fault alarm indications Flashing lamp, intermittent buzzer sounding, fault information display...

  • Page 132: Specifications By Model

    Data logger, vibration, STEL, TWA, integrated value measurement (for CO models only, for Japan models only), quick calibration, peak value display, temperature display 10-2. Specifications by model Model GW-3 (O2) GW-3 (OX) GW-3 (HS) GW-3 (CO) GW-3 (C-) GW-3 (CX)
  • Page 133 10. Product Specifications 10-2. Specifications by model 5 ppm 25 ppm 25 ppm 25 ppm 18.0 % 18.0 % 30.0 ppm 50 ppm 50 ppm 50 ppm 18.0 % Alarm setpoints 18.0 % 18.0 % 100.0 ppm 1,200 ppm 1,200 ppm 1,200 ppm 18.0 % (Export models)

  • Page 134: Appendix

    NOTE  The data logger management program (sold separetely) is required to check data recorded using the data logger function. Contact Riken Keiki for more information. The data logger provides the following five functions: (1) Interval trend Records the changes in measured concentration from when the power is turned on until it is turned off.
  • Page 135 11. Appendix 11-1. Data logger function The maximum recording times corresponding to different intervals are as follows: Interval 10 seconds 20 seconds 30 seconds 1 minute 3 minutes 5 minutes 10 minutes Maximum 10 hours 20 hours 30 hours 60 hours 180 hours 300 hours 600 hours...
  • Page 136 11. Appendix 11-1. Data logger function (5) Calibration history Records data when calibration is performed. This function records calibration time, concentration values before and after calibration, and calibration errors. Records data for the 100 most recent calibrations. If the number of calibrations exceeds 100, the oldest data will be overwritten by the latest data. NOTE ...

  • Page 137: Terminology

    11. Appendix 11-2. Terminology 11-2. Terminology Indicates gas concentration in units of parts per million by volume. Indicates gas concentration in units of parts per hundred by volume. Determining correlation between product readout values, display values, and setting values with Calibration actual values using calibration gas This is the time-weighted average for 1 hour.
  • Page 138 Revision History Issue Revision details Issue date January 21, 2020 First issue * This Technical Manual corresponds to Operation Manual（PT0E-1882）...
  • Page 139 Revision History...

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