Riken Keiki GP-148 Operating Manual
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Riken Keiki GP-148 Operating Manual

Combustible gas detection alarm system
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PT1E-1170
Combustible Gas Detection Alarm System
GP-148
Operating Manual

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Summary of Contents for Riken Keiki GP-148

  • Page 1 PT1E-1170 Combustible Gas Detection Alarm System GP-148 Operating Manual...

  • Page 2: Table Of Contents

    Contents 1. Product Overview ..........................3 1-1. Introduction ............................ 3 1-2. Intended use ..........................3 1-3. DANGER, WARNING, CAUTION, and NOTE ................3 2. Important Safety Information ........................ 4 2-1. Danger items ..........................4 2-2. Warnings ............................4 2-3. Precautions ............................ 5 3.
  • Page 3 6-5. Operations when setting flame detector (option) connection ............37 7. Maintenance ............................38 7-1. Maintenance intervals and items ....................38 7-2. User mode ........................... 39 7-3. Maintenance mode ........................40 8. Storage, Relocation, and Disposal ..................... 60 8-1. Procedure for storage or for extended periods without use ............60 8-2.

  • Page 4: Product Overview

    1. Product Overview 1-1. Introduction Thank you for purchasing this GP-148 Combustible Gas Detection Alarm System. Please confirm that the model number of the product you purchased corresponds to the specifications described in this manual. This operating manual describes the operating procedures and specifications for the product. It provides essential information to ensure correct use of the product.

  • Page 5: Important Safety Information

    ・ Specified devices Do not connect detectors other than combustible gas detectors specified by RIKEN KEIKI to this product. There is a risk of damage to this product or the device being connected if devices other than RIKEN KEIKI devices are connected.

  • Page 6: Precautions

    2-3. Precautions CAUTION ！ ・ Do not use walkie-talkies near the product. Radio waves from walkie-talkies or other radio transmitting devices near the product or cables may affect readings. If you use walkie-talkies or other radio transmitters, use in areas where they will not affect the product. ・...

  • Page 7: Product Functions

    3. Product Functions 3-1. Exterior drawings Base unit Indicator unit (2-point type) Ø7 mounting holes (case rear) Ø21.5 × (n + 2) Cable access hole (punch out for use) Installation procedure 取付寸法 Number of points 点数ｎ Ｗ Ｗ1 Ｐ Ｐ１ Ｐ２...

  • Page 8: Device Configuration And Names

    3-2. Device configuration and names The product consists of a base unit and an indicator unit (for configuration of four points or more) The base unit consists of a buzzer and indicator (two-point type) and the indicator unit consists of an indicator (two-point type).
  • Page 9 Main power switch Turns the main power supply (AC power supply) on and off. ③ System power switch Switch for turning the GP-148 on. ④ Pump (external supply) Switch for turning on the power to the pump (or optional flame ⑤...

  • Page 10: Mounting Diagram

    3-3. Mounting diagram Wall mounting type Installation procedure Number of points Rear cable inlet M6 or Ø7 2 - 8 point configuration: 4 locations 10/12-point configuration: 6 locations Wall-mounting installation Rack-mounted type Number Cutout hole of points dimension A Rack mounting panel cutout diagram...

  • Page 11: Part Names And Functions

    3-4. Part names and functions 3-4-1. Base unit (buzzer) ② Battery voltage bar meter (green/orange) ① Power lamp (green) ④ Battery check button ③ Battery lamp (orange) ⑦ Buzzer stop button ⑤ Alarm lamp (red) ⑧ Alarm reset button ⑨ Check button ⑥...

  • Page 12: Indicator Unit (Same Applied To Base Unit Indicator)

    3-4-2. Indicator unit (same applied to base unit indicator) ③ ④ ② ⑤ ⑩ ⑥ ① ⑦ ⑧ ⑨ ⑪ ⑫ ⑬ ⑭ No. in Name Function figure ① LCD display Displays the gas concentration and status. Power lamp ② This is the power lamp.

  • Page 13: Block Diagram

    3-5. Block diagram Base unit Buzzer Indicator POWER ALARM FAULT POWER ALARM FAULT Operation target Operation target Buttons Buttons BATT. VOLTAGE ALARM TEST (RETURN) POWER BATT. ZERO/△ CHECK Buzzer BATT. BZ. STOP SPAN/▽ ALARM ALARM POINT RESET Button (ENTER) Check Indicator control unit General control unit...

  • Page 14: Usage Instructions

    4. Usage Instructions 4-1. Usage note The usage precautions apply to both users who have previously used the product and first-time users. Failure to observe these precautions may result in failure of the product and/or inability to detect gas correctly. 4-2.

  • Page 15: System Design Precautions

    4-3. System design precautions CAUTION An unstable power supply or noise may result in malfunctions or false alarms. The system in which this product is used must be designed in accordance with the information provided in this section. (1) Use a stable power source. Note that the product’s external output and alarm contacts may activate while the system stabilizes at power-on or in the event of an instantaneous power failure.
  • Page 16 (3) Lightning protection Lightning hazards must be considered at factories or plants in cases of outdoor wiring or in cases of indoor wiring where an indoor cable is laid parallel to a cable drawn from outdoor wiring in the same duct. What is Lightning constitutes a massive emission source and cables act as receiving lightning surge?
  • Page 17 ・ Also add a surge absorber (SK2) as necessary to the load side of the external relay. ・ Depending on load conditions, it may be preferable to attach the surge absorber to the contact side. Check the load behavior to determine the optimal location. Alarm contact GP-148 External relay (low-voltage relay) * SK1, SK2: Surge absorbers...

  • Page 18: Grounding

    4-4. Grounding Connect the grounding terminal to the grounding terminal provided at your location. WARNING Be sure to ground the product before turning on power for the product. Terminal Be sure to provide grounding. This is required for stable operation and safety of the devices.

  • Page 19: Installation Procedure

    4-5. Installation procedure 4-5-1. Wall mounting installation procedure <For 4- to 8-point configuration> Attach the mounting screws at the four positions in each corner. * Be careful to avoid accidentally pinching your fingers when mounting the product, as shaking the product excessively may cause the upper door to close.

  • Page 20: Rack Mounting Installation Procedure

    4-5-2. Rack mounting installation procedure ① Mount the GP-148 into the mounting hole. * For more information on the mounting procedure, refer to ‘3-3. Mounting diagram’. ② Open the upper and lower doors. Attach the rack mounting fittings B (with bolt and cap nut) to the rack mounting fittings A already attached at four locations (six locations for 10-/12-point configuration).

  • Page 21: Device Connection

    4-6. Device connection 4-6-1. Power supply connection The power supply specifications for the product are 100 - 120 V AC or 200 - 240 V AC, 50/60 Hz. Use a power supply with ratings within this specification range. Connect the grounding terminal to your local grounding terminal before connecting the power supply. Use a Class D grounding resistance (not exceeding 100 Ω).

  • Page 22: Wiring

    4-7. Wiring Base unit COM NO External terminals Screw size: M3 Power supply unit ① ② Power input 100 - 120 V AC or 200 - 240 V AC (50/60 Hz) (FG) ③ General alarm unit ① (OPEN) Not used ②...
  • Page 23 Flame detector connections ⑩ Individual alarm contact output 2 個別警報接点出力２ (Gas alarm (standard) or fault alarm (option)) （ガス警報【標準】または故障警報【オプション】） ⑨ ⑧ Individual alarm contact output 1 個別警報接点出力１ (Gas alarm) （ガス警報） ⑦ ⑥ ⑤ 0-20mA+ ⑪ ④ Flame detector 炎検知器 ⑩ ③ ②...

  • Page 24: Operation Method

    5. Operation method 5-1. Preparations for startup Note the following precautions before connecting the power source. Ignoring these precautions may result in electric shock or damage to the product. ・ Ground the product. ・ Check to confirm that external wiring is correctly connected. ・...

  • Page 25: Startup Procedure

    5-3. Startup procedure (1) Before turning on the power switch, confirm that the product has been installed correctly. (2) Open the front cover of the product to reveal the power switch in the lower center. (3) Turn on the main power switch. (Press the top of the switch to turn on;...

  • Page 26: Detection Mode

    5-4. Detection mode 5-4-1. Display operations Product operations are displayed in the following two ways: (1) LCD display: Displays detection target gas concentration and other information. (2) LED lamps: Displays the power supply, operation channel selection, gas information, and fault alarm status.
  • Page 27 Warmup due to error recovery: 25 seconds ― ― ― ― If multiple faults occur, the error display alternates between the codes. The memory error cannot be reset. Contact RIKEN KEIKI. The sensor error is reset by resolving the sensor disconnection problem.

  • Page 28: External Output (General Alarm Output Voltage) Operation

    5-4-2. External output (general alarm output voltage) operation 0 - 6 - 12 V DC model (1) Signal transmission method: Voltage output (non-insulated) (2) Transmission path: CVVS (3) Transmission distance: Maximum 10 m (4) Connected load resistance: Minimum 1 MΩ (5) Status signal level ①...

  • Page 29: Alarm Setpoint Confirmation

    WARNING ！ Be sure to return to detection mode after the alarm test is complete. The product will automatically return to detection mode after 10 hours if left in alarm test mode. 5-4-4. Alarm setpoint confirmation □: Off ■: Lit : Blinking M: In maintenance mode Used to confirm alarm setpoints (setting values).

  • Page 30: Check Mode

    5-5. Check mode The GP-148 features a check mode to facilitate checks. Check mode can be used to perform alarm tests, zero adjustment, span adjustment, and alarm setpoint checking. Check mode cannot be accessed when operating using the UPS. 5-5-1. Check mode procedures □: Off ■: Lit...
  • Page 31 Span adjustment When the SPAN button is pressed, [SPAn] is displayed for two seconds before the concentration is displayed. When a reading appears, feed the calibration gas into the detector. Once the reading stabilizes, press the ENTER button. * Setting is not possible if the reading is less than 10 % of the full scale.

  • Page 32: Ups Operation (* For Ups-Equipped Models)

    5-6. UPS operation (* for UPS-equipped models) 5-6-1. Functions (1) External power supply monitoring function This monitors the output voltage of the switching power supply, and if it detects a voltage drop, determines that the main power supply has been lost (power failure) and automatically switches to operation using the UPS. (2) UPS monitoring function (over-discharge protection function) This monitors the battery voltage when operating using the UPS, and automatically shuts down the UPS supply if it detects a low battery voltage.

  • Page 33: Ups Operation Settings

    (3) Discharge test Used to check the battery capacity. ① Start discharge test Hold down the BATT. CHECK button for at least three seconds. The [POWER] lamp lights up and the [BATT.] lamp blinks. The system switches to UPS operation and discharging starts. ②...

  • Page 34: Operations And Functions

    6. Operations and Functions 6-1. Gas alarm pattern Gas alarm: Triggered if the concentration of the detected gas reaches or exceeds the alarm setpoint 《Self-latching operation》 *NOTE The alarm setpoints (standard) are preset at the factory. The product features an alarm delay time (default: two seconds) set to prevent false alarm activation, but this can be canceled if it is not needed.

  • Page 35: Fault Alarm Pattern

    (initialization). If multiple alarms occur, the error display alternates between the codes. If the problem lies with the product and the fault occurs repeatedly, contact RIKEN KEIKI immediately. * Example display: E-1 sensor error *NOTE For more information on faults (error messages), refer to ‘9.

  • Page 36: Gas Alarms Caused Other Than By Gas Detection

    6-3. Gas alarms caused other than by gas detection Reaction to interfering gas Contact RIKEN KEIKI regarding interference gases. Sensor drift over time Check the readings in the daily maintenance, and recalibrate the detector as necessary. Noise from peripheral equipment Review the installation location and wiring, and add noise prevention devices to the product and detector as necessary.
  • Page 37 <Zero follower function> Depending on the type, the detectors connected to the product may suffer sensitivity variations when used continuously for extended periods. This function is programmed processing designed to stabilize the zero point by correcting fluctuations in readings around the zero point (zero drift) caused by sensitivity variation over time. Default settings: OFF (FS = 100 %LEL), ON (when FS is other than 100 %LEL) Zero follower function off Zero follower function on...

  • Page 38: Operations When Setting Flame Detector (Option) Connection

    6-5. Operations when setting flame detector (option) connection The product is able to receive the 0 - 20 mA signal output from a flame detector (40/40 series) and display the fault, normal, warning, or alarm states, accordingly. To start up, turn on the system power switch, then turn on the pump (external supply) power switch.

  • Page 39: Maintenance

    We recommend taking advantage of our maintenance service to ensure safe use of the product. • The main items of the maintenance service are as follows. Contact RIKEN KEIKI for more information. Major service details Power supply check: Check the power supply voltage.

  • Page 40: User Mode

    7-2. User mode User mode is used to check the product status. Select the desired channel using the selector switch, then hold down the ▲ and ▼ buttons simultaneously. The system switches to user mode, and [1-0] is displayed. The M icon blinks. The power lamp blinks orange on the selected indicator.

  • Page 41: Maintenance Mode

    7-3. Maintenance mode Maintenance mode is used for detailed setting configuration, such as altering sensors, automatic sensor current adjustment, and altering contact operations. WARNING ！ Be sure to return to detection mode after checking is complete. The product will automatically return to detection mode after 10 hours if left in maintenance mode. Mode Item Details...
  • Page 42 Select the desired channel using the selector switch, then hold down the ▲ and ▼ buttons simultaneously. The system switches to user mode, and [1-0] is displayed. User mode Use the ▲ and ▼ buttons, then press the ENTER button for [1-3].
  • Page 43 Refer to Environmental settings 2: Set the various settings. environmental settings 2 Check the display items (current heater, fault details). Refer to display items Performs zero adjustment for intermittent drive. Refer to zero adjustment Switches to factory mode Not used by the user Returns to user mode [1-0].
  • Page 44 <2-0 Test mode> Press the ENTER button. 2-0.0 Not used 2-0.1 Performs alarm test. Refer to alarm test 2-0.2 Performs fault test. Refer to fault test 2-0.3 Performs LED and LCD test. Refer to LED and LCD test 2-0.4 Performs memory test. Refer to memory test To [2-0.0]...
  • Page 45 <2-0.1 Alarm test> ① Select [2-0.1]. ② Press the ENTER button. ③ Use the ▲ and ▼ buttons to raise or lower the reading bars. The alarm pattern is performed when the alarm setpoint is exceeded. ④ Press the RETURN button to return to [2-0.1]. Pressing the RETURN button during the alarm test resets the setting and returns to [2-0.1].
  • Page 46 <2-0.3 LED and LCD test> ① Select [2-0.3] on the menu screen. ② Press the ENTER button. ③ Use the ▲ and ▼ buttons to toggle on or off. ④ Press the ENTER button to set. ⑤ Press the RETURN button to return to [2-0.3]. Pressing the RETURN button during the test resets the setting and returns to [2-0.3].
  • Page 47 <2-0.4 Memory test> ① Select [2-0.4] on the menu screen. ② Press the ENTER button. ③ [StA] is displayed. Press the ENTER button. ④ [CAL] is displayed, and the memory test automatically starts. ⑤ [PASS] is displayed if the test is successful. Press the RETURN button to return to [2-0.4]. * If the test fails, press the RETURN button to return.
  • Page 48 <2-1 Zero adjustment> Used for zero adjustment of the detector (sensor). WARNING ！ Perform zero adjustment using the zero adjustment gas or in fresh air. Correct adjustment will not be achieved in the presence of interference gases, and this will result in safety hazards in the event of an actual gas leak.
  • Page 49 <2-2 Span adjustment> Used for span adjustment of the detector (sensor). ① Select [2-2] on the menu screen. ② Press the ENTER button. ③ Feed the calibration gas. ④ Once the reading stabilizes, press the ENTER button. * Setting is not possible if the reading is less than 10 % of the full scale. ⑤...
  • Page 50 <2-4 Environmental settings 1> Environmental settings 1 is used to set the various functions. (* We recommend keeping a record of the history when changing settings.) Environmental settings 1 includes setting menus that are not normally used. Be careful to avoid accidentally changing the settings.
  • Page 51 2-4.5 Sets the suppression type. Use the ▲ and ▼ buttons to select [CUt] or [SLOP], then press the ENTER button to set. Setting [CUt] (cutoff) displays values exceeding the suppression value directly. Setting [SLOP] (slope) displays values exceeding the suppression value smoothly.
  • Page 52 2-4.A Not used 2-4.B Not used 2-4.C Not used 2-4.D Sets the contact operation during alarm tests. Use the ▲ and ▼ buttons to select [ON] or [OFF], then press the ENTER button to set. When set to [ON], individual alarm contacts operate during alarm testing.
  • Page 53 <2-4.0 Intermittent measurement> Selecting intermittent measurement after 30 minutes of continuous operation for the UPS operation setting will result in intermittent measurement, but this enables the operation time using the UPS to be extended. The on/off time settings for intermittent measurement are as follows: <Intermittent measurement after 30 minutes continuous measurement>...
  • Page 54 <2-4.2 Alarm settings> ① Select [2-4.2] on the menu screen. ② Press the ENTER button. ③ Use the ▲ and ▼ buttons to select the alarm value. (Setting range: 10 - 100) ④ Press the ENTER button to store the setting. Note: The display automatically returns to [2-4.2] after setting.
  • Page 55 ・ When using a contact, the setting is closed in normal conditions and open in the alarm state. It will also open when the power supply is turned off. ・ This behavior is reversed with b contact. *NOTE If you wish to alter the contact specification (a or b contact) settings, contact RIKEN KEIKI.
  • Page 56 <Environmental settings 2> Environmental settings 2 is used to set the various functions. (* We recommend keeping a record of the history when changing settings.) Environmental settings 2 includes setting menus that are not normally used. Be careful to avoid accidentally changing the settings.
  • Page 57 2-5.5 Sets the fault buzzer. Use the ▲ and ▼ buttons to select [ON] or [OFF], then press the ENTER button to set. When [ON] is selected, the buzzer sounds when a fault occurs. 2-5.6 Enables and disables the zero follower function. Setting the time enables the function.
  • Page 58 2-5. A Not used To [2-5.0] For more information, refer to ‘[2-4.0]’. <2-5.0 Heater current adjustment procedure> CAUTION ！ ・ Perform before gas adjustment (zero/span adjustment) after replacing a sensor. ・ Be sure to check that the target gas is not present before performing zero adjustment after turning the power back on again and after recovering from a power failure.
  • Page 59 ・ If a flame detector is selected, the following menus related to gas detection settings in the maintenance menu will be disabled (i.e., they cannot be set). ・ Jumper settings on the circuit board are needed when using a flame detector. Please contact RIKEN KEIKI for more information.
  • Page 60 <Display items> Press the ENTER button. 2-6.0 Displays the heater current. Pressing the ENTER button displays the current heater current. * The heater current value will vary depending on the sensor installed. 2-6.1 Displays the fault details in the form of an error code.

  • Page 61: Storage, Relocation, And Disposal

    ！ Calibration must be performed before reusing a relocated product or a product that was previously stopped and stored. Contact RIKEN KEIKI for readjustments, including calibration. 8-3. Product disposal Dispose of the product as industrial waste (incombustible) in accordance with local regulations.

  • Page 62: Troubleshooting

    This troubleshooting section does not cover the causes of all problems that may occur with the product. It provides brief explanations to assist in determining the causes of common problems. If you encounter symptoms not addressed here or if problems persist even after taking corrective action, contact RIKEN KEIKI. *NOTE Also refer to the operating manuals for the detectors connected to the product.
  • Page 63 <Reading abnormalities> Symptom Cause Action The reading does not return Sensor drift Perform zero adjustment. to normal levels after rising Presence of It is difficult to completely eliminate the effects of (or falling) interference gases interference gases such as solvents. Contact RIKEN KEIKI for information on countermeasures, such as interference gas removal filters.

  • Page 64: Product Specifications

    10. Product Specifications 10-1. Specifications ・ Construction: Wall-mounted or rack-mounted, non-explosion-proof construction ・ Paint color: Lower door: Light gray (Munsell N7.2) Other parts: Black ・ UPS: Yes or no ・ External dimensions/weight: 2-point type: Approx. 305 mm (W) × 290 mm (H) × 73 mm (D), approx. 3.9 kg 4-point type: Approx.
  • Page 65 1. Base unit (including buzzer, 2-point type indicator, UPS battery) ・ Construction: Modular type (up to five indicator units can be used together) ・ General alarm contact output: No-voltage C contact (Contact capacity: 250 V AC, 2 A, resistance load) ・...

  • Page 66: Accessory List

    3. Indicator unit ・ Construction: 2-point type (individual unit), modular type ・ Concentration display type: Character LCD (red/green two-color bar meter display) ・ Individual alarm contact output: No voltage a or b contact (2-Point type) (Contact capacity: 250 V AC, 2 A (resistance load)) ・...

  • Page 67: Terminology

    11. Terminology %LEL The concentration of a combustible gas expressed as a percentage of the lower explosive limit of the combustible gas. The lower explosive limit (LEL) is the minimum concentration of a combustible gas mixed in air at which ignition will result in explosion.
  • Page 68 Revision History Issue Revision Issue date First issue (PT1-1170) June 5, 2023...

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