PT1E-1172

Combustible Gas Detection Alarm System
GP-148Operating ManualContents
1. Product Overview .................................................................................................................................4
1-1. Introduction ....................................................................................................................................4
1-2. Intended use ..................................................................................................................................4
1-3. DANGER, WARNING, CAUTION, and NOTE................................................................................4
2. Important Safety Information ................................................................................................................5
2-1. Danger items .................................................................................................................................5
2-2. Warnings........................................................................................................................................5
2-3. Precautions ....................................................................................................................................6
3. Product Functions ................................................................................................................................7
3-1. Exterior drawings ...........................................................................................................................7
3-2. Device configuration and names ...................................................................................................8
3-3. Mounting diagram ........................................................................................................................10
3-4. Part names and functions ............................................................................................................ 11
3-4-1. Base unit (buzzer) ................................................................................................................. 11
3-4-2. Indicator unit (same applied to base unit indicator) ...............................................................123-5. Block diagram ..............................................................................................................................13
4. Usage Instructions ..............................................................................................................................144-1. Usage note ..................................................................................................................................14
4-2. Precautions regarding installation location ..................................................................................14
4-3. System design precautions ..........................................................................................................15
4-4. Grounding ....................................................................................................................................18
4-5. Installation procedure ..................................................................................................................19
4-5-1. Wall mounting installation procedure ....................................................................................19
4-5-2. Rack mounting installation procedure ...................................................................................20
4-6. Device connection .......................................................................................................................21
4-6-1. Power supply connection ......................................................................................................21
4-6-2. Connecting to contact outputs...............................................................................................21
4-6-3. Connecting to the 0 - 6 - 12 V DC output ..............................................................................21
4-7. Wiring ..........................................................................................................................................22
5. Operation Method ...............................................................................................................................24
5-1. Preparations for startup ...............................................................................................................24
5-2. Basic operating procedures .........................................................................................................24
5-3. Startup procedure ........................................................................................................................25
5-4. Detection mode ...........................................................................................................................26
5-4-1. Display operations ................................................................................................................26
5-4-2. External output (general alarm output voltage) operation .....................................................28
5-4-3. Alarm test ..............................................................................................................................28
5-4-4. Alarm setpoint confirmation ...................................................................................................29
5-5. Check mode ................................................................................................................................30
5-5-1. Check mode procedures .......................................................................................................30
5-6. UPS operation (* for UPS-equipped models) ...............................................................................32
5-6-1. Functions ..............................................................................................................................32
5-6-2. Display and operations .........................................................................................................32
5-6-3. UPS operation settings .........................................................................................................33
5-7. Shutdown procedure ....................................................................................................................33
6. Operations and Functions ..................................................................................................................34
6-1. Gas alarm pattern ........................................................................................................................34
6-2. Fault alarm pattern.......................................................................................................................35
6-3. Gas alarms caused other than by gas detection ..........................................................................36
6-4. Functions .....................................................................................................................................362

6-5. Operations when setting flame detector (option) connection .......................................................38
7. Maintenance .......................................................................................................................................39
7-1. Maintenance intervals and items .................................................................................................39
7-2. User mode ...................................................................................................................................40
7-3. Maintenance mode ......................................................................................................................41
8. Storage, Relocation, and Disposal .....................................................................................................61
8-1. Procedure for storage or for extended periods without use .........................................................61
8-2. Procedures for relocation or reuse...............................................................................................61
8-3. Product disposal ..........................................................................................................................61
9. Troubleshooting ..................................................................................................................................62
10. Product Specifications ......................................................................................................................64
10-1. Specifications .............................................................................................................................64
10-2. Accessory list .............................................................................................................................67
11. Terminology ......................................................................................................................................68* Appendix Power consumption calculation method and UPS operating time quick referral table ......693

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 describedin 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. We recommend that both first-time users and thosewith previous experience with the product carefully read this manual to confirm their understanding of specificinformation and to refresh their familiarity with the product.
Keep this operating manual on hand to allow ready reference during use.
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.

1-2. Intended use
・ This product is a combustible gas detection alarm system designed for use in detectors based on combustible
gas sensors.
・ This product is a safety device, and is not an analyzer or concentration meter designed forquantitative/qualitative gas analysis or measurement. Use the product correctly after confirming you fully
understand its features and characteristics.
・ The combustible gas detector connected to the indicator/alarm unit detects combustible gas leaking into theair.
The detected gas concentration is indicated on the character LCD (green/red bar meter display).
The indication varies depending on the danger level, with green indicating below the alarm setpoint and red
indicating the alarm setpoint or over.
・ This device incorporates two independent output gas alarm contacts (one-step gas alarm contact + one-stepgas alarm contact or fault alarm contact).
・ The base unit includes a general alarm contact, general alarm voltage output (0 - 6 - 12 V DC), externalbuzzer contact output, and 24 V DC (load: 10 mA or less) voltage output.
・ This product can be used with an internal uninterruptible power system (UPS) battery to enable operation tocontinue during a power outage.
・ This product can be used as an indicator for the 0 - 20 mA output by a specified flame detector. (Option)

1-3. DANGER, WARNING, CAUTION, and NOTE！ DANGER！ WARNING！ CAUTION*NOTEThis indicates that improper handling of the product may result in death, severe
injury, or serious property damage.
This indicates that improper handling of the product may result in severe injury or
serious property damage.
The CAUTION symbol indicates that improper handling of the product may resultin minor injury or minor property damage.
The NOTE sign indicates recommendations for product handling.

42. Important Safety Information
2-1. Danger items！ DANGER
The product is a non-explosion-proof device.

2-2. Warnings！ WARNING
・ 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.
・ Power supply
Before turning on the power for the product, be sure to confirm that the power supply voltage meets the
specified voltage requirements.
Avoid using unstable power sources; doing so may lead to malfunctions.
・ Protective grounding requirement
Do not cut the internal or external protective grounding cable of the product or disconnect the protective
grounding terminal.
・ Protective function defects
Check to confirm that there are no defects in the protective functions, such as the protective grounding andfuses. Do not operate the device if you suspect any potential defects in protective functions, such as theprotective grounding.
・ FuseUse a fuse of the specified rating (current, voltage, type) to prevent fire hazards.
Turn off the POWER switch and turn off the main power supply before replacing the fuse.
Do not use fuses other than the specified fuses or short-circuit the fuse holder.
・ Operating in the presence of gases
Do not operate this product in locations where combustible or explosive gases or vapor is present.
Operating this product in such environments is extremely hazardous.
・ External connections
Be sure to provide secure protective grounding before connecting the product to the detection target or
external control circuit.
・ Internal maintenanceBe sure to turn off the switch on the power supply before replacing internal components (work involving
opening the door).
・ Action if a gas alarm occurs
An extreme hazard exists if gas is detected above the alarm setpoint. The user must take appropriate action
based on the situation.

5

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 affectreadings.
If you use walkie-talkies or other radio transmitters, use in areas where they will not affect the product.
・ Wait at least five seconds after turning off the power before turning back on.
The product may not function correctly if the power is turned back on within five seconds.
・ Do not use external output from the product to control other devices.
This product is not a control device. Never attempt to use the external output of the device to control otherdevices.
・ Make sure adequate safety for the instrumentation can be maintained even if the power supply or signal
cables are disconnected or malfunctions or faults occur.
・ Note that the product may very occasionally be affected by electrical noise, static electricity, or
electromagnetic noise.
The product is an electrical device. Provide protective measures before using the product in environments
in which there is a possibility of electrical noise, static electricity, or electromagnetic noise.
・ Do not modify the product or alter the settings unnecessarily.
Never attempt to disassemble or modify the product. Doing so will void product performance guarantees.
Additionally, under certain circumstances, altering the settings unnecessarily without a proper
understanding of the details may prevent the alarm from operating correctly. RIKEN KEIKI rejects all liability
for any accidents arising from failure to observe the warnings indicated above. Use the product correctly inaccordance with this operating manual.
・ Be sure to perform regular maintenance.
The product, which is a safety device, and the detector must be regularly maintained to ensure safety.
・ To clean the product, wipe gently with a dry cloth. Do not use organic solvents like alcohol or benzine,
detergents or cleaners.
・ Be sure to perform zero adjustment after turning the power back on again and after recovering from a
power failure.

63. Product Functions
3-1. Exterior drawings
Base unit

Indicator unit (2-point type)Ø7 mounting hole (case rear)Ø21.5 × (n + 2)
Cable access hole (punch out for use)

Number of points
□
□
□
□
□
□

2
4
6
8
10
12

W

W1

305
395
485
575
665
755

297
387
477
567
657
747

Mounting dimension
P1
P2
276
366
456
546
305
331
305
421

[(n/2)+1] pcs.
Back cableM6 or φ7
2–8 points: 4pcs. 10-12 points: 6pcs

7

3-2. Device configuration and names
The product consists of a base unit and an indicator unit (for configuration of 4- or more point type)The base unit consists of a buzzer and indicator (2-point type) and the indicator unit consists of an indicator(2-point type).
In addition to the indicator, the base unit includes a switching regulator and UPS (uninterruptible power system)
battery*.
* For UPS-equipped models<Appearance>

Indicator unit
Base unit

Buzzer8

Indicator (2-point type)<Base unit interior>⑥ Voice unit (option)connector① Switching regulator⑤ Pump (external
supply) switch② UPS battery*③ Main power switch④ System power switch①

Switching regulator②

UPS battery③

Main power switch

Power supply unit generating a voltage of 24 V DC from the AC power
supplyBattery providing an uninterruptible power supply when the main power
supply is unavailable due to power outage or other reasons*Switch for turning the main power supply (AC power supply) on and off④

System power switch

Switch for turning the GP-148 on⑤

Pump (external supply)
switchVoice unit connector

Switch for turning on the power to the pump (or optional flame detector)⑥

Connector for connecting to the optional voice unit
* For UPS-equipped models

93-3. Mounting diagram
Wall-mounted typeRear cable inlet

M6 or Ø7
2- to 8-point configuration: 4 locations
10/12-point configuration: 6 locations

Wall mounting installation diagram

Rack-mounted type

Numberof points

Cutout holedimension A

Rack mounting panel cutout diagram10

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 button⑤ Alarm lamp (red)⑧ Alarm reset button⑨ Check button⑥ Buzzer

No. infigureName

Function①

Power lamp (green)This is the power lamp. Lights up during normal operation.

②

Battery voltage bar meter(green/orange)

Indicates the battery voltage level via a bar meter.*③

Battery lamp (orange)④

Battery check button⑤

Alarm lamp (red)⑥Buzzer⑦

Buzzer stop button⑧

Alarm reset button⑨

Check button

Lights up when the UPS is operating. Blinks during a battery
discharge test.*
Used to perform a battery discharge test. Hold down to start. Holddown again to end.
Lights up red when a gas alarm occurs. Goes out when the alarmis reset.
The buzzer sounds when an alarm or fault occurs.
Silences the buzzer. Hold down the button when the buzzer is notsounding to sound the buzzer. Hold down while the buzzer issounding to alter the volume level. (Three levels)
Press to reset the gas alarm pattern. If the alarm pattern isself-latching, press the reset button to switch from self-latching toauto-reset.
Hold down to select check mode. Hold down again to exit checkmode and return to measurement mode.
* For UPS-equipped models

113-4-2. Indicator unit (same applied to base unit indicator)
②

③

④

⑤

⑩

⑥

①

⑦
⑧

⑨
⑪
⑫
⑬

⑭

CH1
No. infigure
①
②
③
④

Name

Function

LCD display
Power lamp
Alarm lamp
Fault lamp

Displays the gas concentration and status.
Lights up when the product is operating.
Lights up when a gas alarm occurs.
Lights up when a fault occurs.
Used for maintenance. While being held down, a simulated
full-scale concentration is produced.
Used to return to the initial menu screen.
Used to start zero adjustment in check mode.
Used to increment/decrement a menu number or setting inmaintenance mode.
Used to start span adjustment in check mode.
Used to increment/decrement a menu number or setting inmaintenance mode.
ALARM POINT: Used to confirm alarm setpoints.
ENTER: Used to confirm selection items in various modes.
Power switches for CH1 and CH2
Selects the channel (left/right) to which button operations apply.
The power lamp lights up orange when selected.
Can be used as gas alarm or fault alarm contacts.
(Normally used as gas alarm contacts）
Can be used as gas alarm contacts.
Used to connect detectors.
Power supply terminals for suction type detector pumps orflame detectors (option)⑤

ALARM TEST/RETURN button⑥

ZERO/▲ button⑦

SPAN/▼ button⑧

ALARM POINT/ENTER button⑨

Power switch⑩

Selector switch⑪

Individual alarm contact output 2⑫⑬

Individual alarm contact output 1
Sensor terminals
Pump (external output) power
supply⑭

CH212

3-5. Block diagram
Base unit
Indicator

Buzzer

LED

BATT.

BATT.

Buzzer

CHECK

ALARM

BZ. STOP

Button
Check

RESET

Operation target

Operation target

CH1

BATT. VOLTAGE

POWER

POWER ALARM

CH2

Gas concentration level
displayLED

Buttons

FAULT

Gas concentration level
display

LED

POWER ALARM

FAULT

Buttons
ALARM TEST(RETURN)
ZERO/△SPAN/▽
ALARM POINT(ENTER)

Indicator control unit

General control
unit

Switching power

UPS battery
12V 2.3Ah

Power control
unit

×2

Alarm processing unit /External signal processing
・Individual alarm contact

Powersupply unit

Fuse
Surge
absorber

Alarm processing unit
General alarm contact
Voltage output(0 - 6 - 12 V/24 V DC)
External buzzer
contact

Main power input
100 - 120 V/
200 - 240 V AC
(50 Hz/60 Hz)

13

CH1: Amp unit

CH2: Amp unit

Detectors

Detectors

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. Precautions regarding installation location

CAUTION・ Do not install in locations exposed to direct sunlight or sudden temperature fluctuations.
Avoid locations exposed to direct sunlight or radiant heat (infrared radiation from high-temperature
bodies) and locations that may subject the product to sudden temperature fluctuations.
Condensation may form inside the product.
・ Do not install the product in locations where there is a risk of splashing water, oil, chemicals, or otherliquids.
・ Do not install in locations where temperatures can fall below -10 °C or exceed +50 °C.
The operating temperature range for the product is -10 °C - +50 °C. Install in a stable location within
the specified operating temperature range and free of sudden temperature fluctuations.
・ Do not install the product in locations subject to vibration or impact.
The product contains precision electronic components. Install the product in a stable location not
exposed to vibration, impact, or risk of falling.
・ Install away from noise-emitting devices (main unit and cables).
Install the product away from locations with devices that may emit high frequencies.
・ Do not install next to devices that generate noise.
・ Do not lay cables parallel to each other.
・ Keep cables away from each other.
・ Do not install the product in locations where the detection target gas accumulates.
Do not install the product and detect in locations where the detection target gas accumulates.
・ Do not install in locations where maintenance is dangerous or not possible.
The product must be maintained regularly.
Do not install within systems where the system must be stopped for maintenance; where part of thesystem must be detached to allow maintenance; where the product cannot be removed due to thepresence of pipes or racks; or in other such locations. Do not install in locations where maintenancework would be hazardous (for example, due to the presence of high-voltage cables).
・ Do not install in improperly grounded systems.
When installing within a system, make sure the system is properly grounded.

14

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 accordancewith 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. In such cases, either use a UPS(uninterruptible power system) or take appropriate measures on the side receiving the power.
Supply this product with a power source that meets the following requirements:
Power source
voltageTime allowed for
instantaneous
power failures
Miscellaneous

100 - 120 V AC or 200 - 240 V AC, 50/60 Hz(voltage of main unit terminal)
Approx. 100 ms (without suction
Example of steps to takedetector) (Power failures lasting longer
Use an external uninterruptible power
than 100 ms will require restarting to
supply or similar system to guarantee
recover.)
continuous operation and functionality.
Example of steps to take
Do not use with power sources subject
Where necessary, use a line filter or otherto very high power loads or highdevice, and keep the product away fromfrequency noise.
noise sources.

(2) Design accounting for heat dissipation.
If you plan to install the product in a closed instrument panel or similar space, install ventilation fans at
the top and bottom of the panel.

15

(3) Lightning protection

What islightning surge?

Lightningprotection

GroundingLightning 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 cabledrawn from outdoor wiring in the same duct.
Lightning constitutes a massive emission source and cables act as receiving
antennas, which can result in damage to devices connected to the cables.
It is not possible to stop lighting from occurring. Additionally, note that inductive
lightning surges due to lightning strikes cannot be entirely prevented, even if cables
are installed in metal ducts or buried underground.
While it is not possible to protect completely against disasters caused by lightning,
the following protective measures can be taken: Take appropriate measures basedon environmental conditions and the importance of the facility.
・ Connecting signal transmission paths via optical fibers
・ Protection using lightning arrester (cable arrester) (A lightning arrester can beinstalled before the field devices and central processing equipment to protect
against the possibility of inductive lightning surges transmitted through thecables. For usage details, contact the manufacturer of the lightning arrester.)Surge noise is caused by lightning strikes and other factors. Devices must be
grounded to protect against such noise sources.

* Lightning arresters include circuits that remove surge voltages that can damage field devices.
Installing a lightning arrester may therefore attenuate signals.
Perform an operation check before installing a lightning arrester.

(4) Alarm contacts
The alarm contacts on this product are designed to be used to transmit signals to activate externalbuzzers and alarm indicators.
Do not use for other purposes, such as for control purposes — for example, to control shutoff valves.

CAUTIONA de-energized b contact (break contact) may cause a momentary open operation due tophysical impact such as an external force. If a b contact is used as an alarm contact,
implement measures to account for such momentary operations—for example, adding adelay operation (of approximately one second) to the signal on the b contact receivingside.
The alarm contact specifications of the product are described assuming resistance loads. If the alarm
contacts use inductive loads, a reverse voltage will occur at the contacts, leading to the following
potential problems:・ Relay contact sticking, insulation failure, contact failure
・ Damage to electrical components due to high voltages occurring inside the product・ Malfunctions due to CPU runaway
・ Whether due to an inductive load or not, unpredictable noise may occur at the contacts, possibly
causing any of the faults described above.

16

CAUTION
・ Do not normally use the alarm contacts of the product to operate inductive loads. (Inparticular, never use to operate devices such as fluorescent lamps or motors.)
・ If operating inductive loads, link using an external relay (contact amplification).
However, since the external relay coil also constitutes an inductive load, use a relaythat runs on low voltage (less than 100 V AC) and a suitable surge protector (CRcircuit, etc.) to protect the contacts of the product.
* Examples of inductive loads include the following:・ Signal towers, external relays, buzzers, sirens, fans, fluorescent lamps, motors
When operating a load, take appropriate measures referring to the following to stabilize the operation of the
product and protect the alarm contacts.

GP-148CoilPowersourceAlarm contact

SK2

Power
sourceSK1

Load・ Use an external relay (low voltage, not exceeding 100 V AC) to link the circuits (contact
amplification). Add a surge absorber (SK1) appropriate for the rating to the external relay.
・ 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.

External relay(low-voltage relay)* SK1, SK2: Surge absorbers

174-4. Grounding
Connect the grounding terminal

to the grounding terminal.

WARNINGBe sure to ground the product before turning on power for the product.

Terminal
Be sure to provide grounding. This is required for stable operation andsafety of the devices. Never connect the grounding wire to a gas pipe. Usegrounding equivalent to Class D grounding (grounding resistance 100 Ω orless).

18

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.

Mounting holes (× 4)<For 10-/12-point configuration>
Attach the mounting screws at the four positions in each corner and also the two positions on theindicator unit adjoining the base unit.
* Be careful to avoid accidentally pinching your fingers when mounting the product, as shaking the
product excessively may cause the upper door to close.

Mounting holes (× 6)19

4-5-2. Rack mounting installation procedure① 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 therack mounting fittings A already attached at four locations (six locations for 10-/12-point
configuration). Loosen the screws on the rack mounting fittings B before attaching.
* Be careful to avoid accidentally pinching your fingers when mounting the product, as shaking the
product excessively may cause the upper door to close.
Rack mounting fitting A

Slide toward you.

Rack mounting fitting B③ Attach the rack mounting fittings B to the four (or six) locations described in step ② above, thentighten the bolts to complete the mounting procedure.
* As with the wall mounting procedure, there are four rack mounting fitting locations for the 4- to
8-point configuration, and six for the 10-/12-point configuration.

20

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 apower supply with ratings within this specification range.
Connect the grounding terminal to your local grounding terminal before connecting the power supply. Use aClass D grounding resistance (not exceeding 100 Ω). After grounding, allow the product to stabilize before
connecting the power supply and other connections.

4-6-2. Connecting to contact outputs
The outputs from the indicator unit are the individual alarm contacts 1 (gas alarm contacts) and individual
alarm contacts 2 (gas alarm contacts or fault alarm contacts). The outputs from the base unit are the general
alarm contacts and external buzzer contacts.
The contact capacity is 250 V AC, 2 A for the general alarm contacts and 250 V AC, 1 A for the externalbuzzer contacts. (Both with resistance load) Install an auxiliary relay circuit if connecting to a load thatexceeds the contact capacity.

4-6-3. Connecting to the 0 - 6 - 12 V DC output
The standard output from the base unit is a 0 - 6 - 12 V DC signal. The load current does not exceed 10 mA.
Use shielded cable equivalent to CVVS for the cable connections.

21

4-7. Wiring
Base unit
External terminals

COM

NO

Screw size: M3

Power supply unit
①
②
③

(L)
(N)
(FG)

Power input

100 - 120 V AC or 200 - 240 V AC (50/60 Hz)

General alarm unit①

(OPEN) Not used

②
③

(+)
(-)

External buzzer power supply output: 24 V DC (load current 10 mA or less)

④
⑤

(+)
(-)

General alarm voltage output: 0 - 6 - 12 V DC (load current 10 mA or less)

⑥
⑦
⑧

(NO)
(COM)
(NC)

General alarm contact output: No-voltage C contact (Contact capacity: 250 V AC, 2 A,
resistance load)

⑨
⑩

(COM)
(NO)

External buzzer contact output: (Contact capacity: 250 V AC, 1 A, resistance load)22

Indicator unit
External terminals
Gas detector connections
Individual alarm contact output 2(Gas alarm (standard) or fault alarm (option))
Individual alarm contact output 1(Gas alarm)

GD-A80diffusion
type
detector
GD-D58DC suction
type detector
Screw size: M3

Flame detector connections

Individual alarm個別警報接点出力２contact output 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】）⑩

Individual alarm個別警報接点出力１contact output 1(Gas
alarm)（ガス警報）

⑧

⑨

⑦
⑥
⑤

0-20mA+ ⑪
炎検知器
Flame
detector

④

⑩

③

②

②

ー

①

＋

①

ネジサイズ：Ｍ３
Screw
size: M3

！ CAUTION
・ Take care to avoid damaging internal electronic circuits during wiring work.
・ Use a CVV 1.25 mm2 or 2 mm2 (4-core) cable to connect the indicator to the detector.
RIKEN KEIKI rejects all liability in cases where a cable other than the type specified is used.
・ Use separate cables to connect the indicator to the detector, for the input power supply, for thepump power supply, and for the external output. Do not use cables routed within the same core.
・ Do not route the power cables, detector cables, and signal cables alongside power lines for motors
or similar equipment.
・ Do not use the pump power supply output from the detector to operate other devices.
Connect only pumps with the same input power supply voltage as the product.
A separate power supply will be required when connecting a pump with different voltage
specifications.
・ Only three-wire cables can be used for connecting the indicator to the flame detector. (Four-wirecables cannot be used.)
Indicator settings are required to connect to a flame detector. These must be specified at the time ofordering.

23

5. Operation Method5-1. 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.
・ Check to confirm that the voltage of the supplied power source is within the rated range.
・ The external contacts may activate during adjustment. Take appropriate precautions to safeguard
external devices against contact activation.
・ Check to confirm that the fuse has the specified rating.

5-2. Basic operating procedures
The product is normally used in detection mode after the power is turned on.

Alarm test

(General terminal unit is not
linked)Preparations forstartup

Alarm test

(General terminal unit islinked)Alarm setpoint
display

Check mode
Power onInitialization

Detection
mode

Alarm setpoint
confirmation
Zeroadjustment
Spanadjustment

Hold down

Hold down

Hold down together

User mode

Hold down

Maintenancemode

Hold down* Buttons other than the CHECK MODE button can be used after
selecting the corresponding channel using the selector switch.

！ WARNING
Switching from detection mode to other modes in an alarm state will cancel the alarm.

24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; press the bottom of the switch to turn off.)(4) Turn on the system power switch.
(Press the top of the switch to turn on; press the bottom of the switch to turn off.)
Front

Interior

Main power switch

System power switch

Pump (external output) power
supply switch(5) All lamps will go on when the power is turned on, and the product switches to detection mode once
initialization is complete.
<<Startup process>>
Preparations

Power on(All lamps lit)

・ Device system confirmation
・ 0 - 6 - 12 V DC Output: 6 V DC

Initialization (approximately 25 seconds)*

・ Alarm, problem operation shutoff (lamps/contacts)* Takes approximately 65 seconds when flame detector
connection is set.

Detection mode

！ CAUTION・ Never turn the power off during initialization.
・ Even after the system has started up, warmup time is required for sensors if they have been newly
installed or replaced. Allow the system to warm up for the specified period of time. Perform
calibration once warmup is complete. Also refer to the operating manual for the gas detector.
・ Alarm behavior and output signals will be unstable during warmup. Take precautions by notifying therelevant departments that may be affected by abnormalities beforehand.
・ If [E-1] is displayed after initialization, turn the power off and then back on again.

25

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.
* The LCD display and LED lamps will differ depending on the device status.

: Blinking□: Off ■: Lit
M: In maintenance mode or check mode

Measurement state
Only the POWER lamp is lit, and the gas concentration
display (green bar meter) indicates the sampling gas
concentration.
Negative values (below zero) are subject tosuppression corresponding to 10 % of the full scale.
If the value is below 10 % of the full scale, the bar
drops below the zero point, as shown in the figure on
the right. (“-0” state)(Below zero)(Normal)！ WARNING
Accurate gas detection will not be possible in the “-0” state, so zero adjustment must be
performed.

26

Gas alarm

When gas is detected above the alarm setpoint, thegas concentration display (bar meter) turns red, theALAM lamp (red) blinks on the indicator, and thebuzzer sounds. The ALAM lamp (red) also lights up on
the base unit.

(Gas alarm state)(Normal)Fault display

A fault alarm occurs if an abnormality is detected in the
product (auto-reset).
When a fault alarm occurs, the FAULT lamp lights up(orange), the error code appears on the LCD, and thebuzzer sounds.

(LCD display)(Fault details)

E-9

System error: E.g. Memory error

E-1

Sensor error: E.g. Sensor disconnected― ― ―(Normal)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.

27(Fault alarm state)

5-4-2. External output (general alarm output voltage) operation
0 - 6 - 12 V DC model(1) Signal transmission method:(2) Transmission path:(3) Transmission distance:(4) Connected load resistance:(5) Status signal level① Detection mode:② Gas alarm:③ Initialization:④ Check mode:⑤ Maintenance mode:⑥ Alarm test:⑦ Fault alarm:(6) Power supply failure:

Voltage output (non-insulated)
CVVS
Maximum 10 m
Minimum 1 MΩ
6V
12 V
6V
6V
6V
12 V
0V
0V

5-4-3. Alarm test
Used to check the product alarm operation by generating a simulated signal equivalent to the gas
concentration.
① Select the desired channel using the selector
switch.
(The POWER lamp lights up orange for theselected channel.): Blinking□: Off ■: Lit
M: In maintenance mode

M CH1 OFF CH2② Hold down the ALARM TEST button to simulate an
alarm level and trigger the alarm operation.
(The buzzer and general alarm output are notlinked.)③ Release the ALARM TEST button to end the alarmtest.
④ Return the selector switch to the center position to
end.

28

☜

5-4-4. Alarm setpoint confirmation: Blinking□: Off ■: Lit
M: In maintenance mode

Used to confirm alarm setpoints (setting values).
① Select the desired channel using the selector
switch.
(The POWER lamp lights up orange for theselected channel.)
M CH1 OFF CH2② Hold down the ALARM POINT button to display thecurrent alarm setpoint and check the value set.
③ Release the ALARM POINT button to return todetection mode.
④ Return the selector switch to the center position to
end.

29

☜

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: Blinking□: Off ■: Lit
M: In maintenance mode

① Hold down the CHECK MODE button.
All channels on the indicator switch to check mode.
The M symbol appears on the LCD, and theindicator address* is first displayed for fiveseconds, after which the concentration isdisplayed.
* The address is internal information,and should be used as iswithout any worries.

Example address
display☜② Slide the selector switch to the desired channel.
The POWER lamp changes to orange for the selected indicator.
M CH1 OFF CH2③ The corresponding operations for each of the buttons are as follows:
Alarm test
Hold down the ALARM TEST button to simulate an alarm level and trigger the alarm operation.
The buzzer and general alarm output will also operate.

！ WARNING
Before performing an alarm test (transmission test), notify the relevant departments
beforehand and take precautions to prevent problems due to the external output signals andalarm contacts.
Zero adjustment
When the ZERO button is pressed, [ZErO] appears for two seconds before the concentration isdisplayed.
Press the ENTER button with the detector in fresh air. [CAL] appears, and then zero adjustment starts
automatically.
[PASS] appears if adjustment is successful, and [FAIL] appears if adjustment fails. The system
automatically returns to the check mode initial screen.
Successful
Automatic

Failed30

Span adjustment
When the SPAN button is pressed, [SPAn] is displayed for two seconds before the concentration isdisplayed.
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.
Use the ▲ and ▼ buttons to adjust to the concentration of the calibration gas, then press the ENTER
button.
[CAL] appears, and adjustment is performed.
[PASS] appears if adjustment is successful, and [FAIL] appears if adjustment fails. The system
automatically returns to the check mode initial screen.
Introduce gas

Successful

FailedAlarm setpoint confirmation
Hold down the ALARM POINT button to display the alarm setpoint for checking.
Releasing the button returns to the check mode initial screen.
Release④ Return the selector switch to the center position once checking is complete.
Hold down the CHECK MODE button to return all channels to detection mode.

！ 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 check mode.

31

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 themain 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.

5-6-2. Display and operations(1) Power supply status display function
The POWER and BATT. lamps light up or blink depending on the power supply status.
External power
UPS operation*
Discharge test
supply operation

POWER lamp
BATT. lamp

Lit
Off

Lit
Lit

Lit
Blinking* The BATT. lamp starts blinking (two seconds on/two seconds off) to save energy 30 minutes after starting UPS
operation.

(2) Battery voltage display function

UPS (battery) voltage is displayed by bar meter.

①
26 V or more:
25 V or more:
24 V or more:
23 V or more:
21 V or more:
Less than 21 V:

②

③

①②③④⑤
①②③④
①②③
①②
①
①

④

⑤

Lit
Lit
Lit
Lit
Lit
Blinking

Color: Green
Color: Green
Color: Green
Color: Orange
Color: Red
Color: Red* All display sections are lit up green when the voltage is 24 V or more.
Nothing is displayed if no UPS is included.

32

(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 End discharge test
Hold down the BATT. CHECK button for at least three seconds.
The system returns to normal operation using the main power supply.

！ WARNING
Be sure to press the BATT. CHECK button to return to normal operation
after the discharge test has ended.

5-6-3. UPS operation settings
The indicator operation can be set to one of the following on switching to UPS when a power failure occurs.
① Continuous measurement② Off③ 30 minutes continuous measurement before turning off④ 30 minutes continuous measurement followed by intermittent measurement
Measurement on time: Determined for each sensor Settings cannot be changed.
(HW-6239: 30 s, other sensors: 15 s)
Measurement off time: Select from 10/30/60/90 mins.
This setting can be configured for each channel, and is performed in maintenance mode [2-4.0].
For more information on settings, refer to the maintenance mode explanation.

5-7. Shutdown procedure
To shut down the product, open the front lower cover on the base unit, turn off the system power switch, thenturn off the main power switch. After this, shut off the power supply (100 - 240 V AC) to the product.

！ WARNING
・ Shutting down product operation may activate an alarm in an upstream (central) system.
Before shutting down product operation, apply an inhibit (point skip) at the upstream (central) system.
Additionally, check the devices connected to the external output of the product and the external contact
output terminals to determine whether it is acceptable to turn off the power to those devices.
・ If a UPS is connected, the UPS will continue to operate if the system power is on, even if the main powerswitch is turned off.

33

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.

(1) Display operations① Gas concentration display
If the reading exceeds the detection range (full scale exceeded), the bar meter indication blinks.
② POWER lamp (green)
Remains continuously lit.
③ ALARM lamp (red)The ALAM lamp lights up when the alarm setpoint is reached or exceeded.
The ALARM lamp goes out when the gas concentration falls below the alarm setpoint after pressing the
BZ. STOP button followed by the RESET button.
(2) External output operations① 0 - 6 - 12 V DC output
12 V DC is output when an alarm occurs. The maximum load that can be connected is 10 mA.
② Alarm contacts
The contacts operate if the gas concentration reaches or exceeds the alarm setpoint.
The contact operation resets automatically when the gas concentration falls below the alarm setpoint afterpressing the BZ. STOP button followed by the RESET button.

Alarm pattern

Concentration

Alarm setpoint

0

ALARM lamp
Alarm contacts (terminal
boards 7, 8, 9, 10)
operation
Alarm delay time (two seconds)

34

(3) Action when a gas alarm occurs
Reaction to leakage gas
If a gas alarm occurs, take action promptly in accordance with your management rules.
The typical procedures are as follows:① Check the product reading.
*NOTE
In the case of momentary gas leaks, the reading may have already dropped by the time the reading ischecked. The reading may also drop while in the temporary alarm state due to factors other than gas
alarms, such as noise or incidental conditions.
② Keep persons out of the monitored zone to ensure safety in accordance with your gas alarm control
concentrations.
③ If the gas concentration display remains unchanged, close the main valve for the gas in question andcheck to confirm that the concentration reading drops.
④ Access the gas leakage location, equipped with protective gear to avoid any possible hazards due toresidual gas, and check for the presence of residual gas using a portable gas detector.
⑤ Once you have determined that no danger exists, take action to fix the gas leak.

6-2. Fault alarm patternFault alarm: Occurs if an abnormality is detected in the product.
Errors other than a system abnormality [E-9] is auto-reset.
When a fault alarm occurs, the FAULT lamp lights up (orange), the error code appears on the LCD,
and the buzzer sounds. Press the BZ. STOP button to stop the buzzer.
After the product has successfully recovered from the fault, it restarts with the process normally
performed right after it is turned on (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. Troubleshooting’.

35

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 asnecessary.
The actual measures required will differ depending on the individual site conditions.
The effects of momentary noise may be experienced, such as due to lightning. Preventive measures such as
surge protection can be implemented once the causes have been identified.

6-4. Functions<Suppression function>
Detectors connected to the product may be affected by environmental fluctuations (such as temperature andhumidity characteristics) and interference gases (interference characteristics), which may affect the readings.
Readings may therefore sometimes fluctuate around the zero level even under normal conditions with no gas
leaks.
This function is designed to minimize the effects of these ambient fluctuations and interference gases around thezero level to prevent problems from a management perspective. Using this function suppresses reading
fluctuations below the preset value* to give a zero reading.

Without suppression function
The reading fluctuates aroundthe zero level.

With suppression function
Displays zero up to thepreset value.

！ CAUTION
Negative values (below zero) are subject to suppression corresponding to 10 % of the full scale.
If the negative value exceeds 10 % of the full scale, the bar drops down (-0 state), but since accurate
gas detection will not be possible in this state, zero adjustment must be performed.

36

<Zero follower function>
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 inreadings 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

Reading

Reading⇒0

Zero point* Sensor zero drift appears in readings.

0* Zeroing is performed periodically.

Time

Zero pointTime<Peak hold function>
This holds the peak concentration bar display after an alarm occurs in normal measurement (detection mode).
The FS bar blinks if the full scale is exceeded. Press the BZ. STOP button then the RESET button to reset thehold function.

37

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 thefault, normal, warning, or alarm states, accordingly. To start up, turn on the system power switch, then turn on
the pump (external supply) power switch.
Initialization

NormalWarning

Alarm

Fault

The flame
pictogramrepeatedly lights
up from bottom
to top. (Green)

Lights up ingreen.

The flame
pictogramrepeatedly lights
up from bottom
to top. (Red)Lights up in
red.

The FAULT lamp
lights up.

The flame detector (40/40 series) setting must be set to [0-20mA Wiring Option 1 (source 3-wire)]. For more
information on settings and details, such as alarm delay time, refer to the flame detector (40/40 series) operating
manual.

38

7. Maintenance
The product is an important safety and disaster-prevention device.
Maintain the product at regular intervals to ensure performance and improve disaster-prevention and safety
reliability.

7-1. Maintenance intervals and items• Daily maintenance:
Perform maintenance before commencing work.
• Monthly maintenance: Inspect the alarm circuit (alarm test) once a month.
• Regular maintenance: Perform maintenance at least once every six months to ensure performance as a safety
device.
Inspection
Daily
Monthly
RegularInspection details
item
maintenance maintenance maintenancePower supply
Check to confirm that the power lamp
〇
〇
〇
check
lights up.
Check to confirm that theconcentration reading is zero.
Concentration
If the reading is offset, confirm that〇〇〇
display checkthere is no interference gas in thevicinity of the detector, then performzero adjustment.
Alarm test
Use the alarm test function to check〇〇―the alarm circuit.
Span
Perform span adjustment using a〇――adjustment
calibration gas.
<Maintenance service>・ RIKEN KEIKI provides services related to regular maintenance, including span adjustment, as well as otheradjustments and maintenance.
Preparing calibration gas requires the use of dedicated tools, such as gas cylinders of the specified
concentration and gas sampling bags.
Our certified service engineers have knowledge of the dedicated tools used for these services, along withexpertise in products. 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. Check to confirm that the power lamp lights up.
(Check to see if it is possible to determine that this is the relevant location in the system.)(Check the operation of the UPS (uninterruptible power system), if used.)Concentration display check: Check to confirm that the concentration reading is zero using zero gas.
Perform zero adjustment if the reading is not zero.
Alarm test:
Check the alarm circuit using the alarm test function.
・ Check alarm lamps (Check alarm operation)
・ Check external alarms (Check buzzer and other external alarm operations)
Span adjustment:
Perform span adjustment using a calibration gas.
Gas alarm check:
Check the gas alarm using a calibration gas.
・ Check alarms (Confirm alarm activation when alarm setpoint is reached)・ Check delay time (Check delay time until alarm activation)
・ Check alarm lamps (Check alarm operation)
・ Check external alarms (Check buzzer and other external alarm operations)
Product cleaning/repair:
Check the product exterior, covers, and interior for dirt and damage, and clean and repair(Visual inspection)
problem areas.
Replace parts if cracked or damaged.
Product operation check:
Operate the keys to check the behavior of various functions and the parameters.
Consumable parts replacement: Replace sensors and other consumable parts39

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 theselected indicator.

1-0

1.0.0 to 1.0.2 allow the internal software version to be checked. (Three types)↓ Enter↓ Enter↓ Enter

1-1

Used to check the indicator unit internal address displayed. (Not normally used)

1-2

Displays settings.

1-2.0

The settings displayed automatically scroll.
The display scrolls in the order gas number, alarm setpoint, alarm delay, zero suppression value, zero
follower on/off/time.

Example display:zero follower: off

Gas number: 0, alarm setpoint: 25 %LEL, alarm delay: 2 s, zero suppression value: 2 %LEL,

1-2.1 Gas number, 1-2.2 Alarm setpoint, 1-2.3 Alarm delay time, 1-2.4 Zero suppression value, 1-2.5 Zerofollower on/off time
1-3

Menu for accessing maintenance mode.
For details, refer to the maintenance mode section.

40

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.

Test mode

LCD
display2-0

Zero adjustment
Span adjustment
Zero/span initialization
Environmental settings 1

2-1
2-2
2-3
2-4

Environmental settings 2

2-5

Display items

2-6

Mode
Maintenancemode(Regularmaintenance)

Item

Zero adjustment forintermittent drive
Factory mode
Return to user mode

Details
2-0.0 ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Not used
2-0.1 ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Alarm test
2-0.2 ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Fault test
2-0.3 ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ LED and LCD test
2-0.4 ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Memory test
Performs zero adjustment.
Performs span adjustment.
Initializes zero and span values.
Individual function settings
2-4.0 ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Sensor operation settings when using UPS
2-4.1 ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Not used
2-4.2★ ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Alarm settings
2-4.3★ ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Alarm delay time settings
2-4.4★ ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Alarm pattern settings
2-4.5★ ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Zero suppression type settings
2-4.6★ ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Zero suppression value settings
2-4.7 ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Contact settings
2-4.8 ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Alarm contact energized/de-energizedsettings
2-4.9 ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Not used
2-4.A ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Not used
2-4.B ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Not used
2-4.C ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Not used
2-4.D ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Alarm test contact output settings
2-4.E ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Password settings
2-4.Fꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Sensor fault operation settings
Individual function settings
2-5.0★ ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Heater current adjustment
2-5.1 ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Not used
2-5.2 ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Detector type/gas number selection
2-5.3★ ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Alarm value limiter settings
2-5.4 ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Fault delay time settings
2-5.5 ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Fault alarm buzzer settings
2-5.6 ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Zero follower settings
2-5.7 ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Green LCD brightness adjustment
2-5.8 ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Red LCD brightness adjustment
2-5.9★ ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Sensor stop time setting for intermittent
measurement
2-5.A ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Not used
2-6.0 ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Heater current display
2-6.1 ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ Fault details display
2-6.2 ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ 0 - 20 mA input display

2-7★

Performs zero adjustment for intermittent drive.

2-8
2-9

Not used by the user.
Returns to user mode [1-0].

Selecting flame detector in [2-5.2] disables the setting menu for the gas detector (items marked ★ in list above),
preventing use.

41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 modeUse the ▲ and ▼ buttons, then press the ENTER button for[1-3].

Hold down the ENTER button again for at least threeseconds.

The system switches to maintenance mode, and [2-0] isdisplayed.

Maintenance mode
2-0
Performs various tests.

Refer to test
mode.

2-1
Performs zero adjustment.

Refer to zeroadjustment.

2-2
Performs span adjustment.

Refer to span
adjustment.

2-3
Initializes the zero and span values.
Perform before gas adjustment (zero/span adjustment) after
replacing a sensor.

2-4
Environmental settings 1: Set the various settings.

Refer toenvironmental
settings 1.

42

2-5
Environmental settings 2: Set the various settings.

Refer toenvironmental
settings 2.

2-6
Check the display items (current heater, fault details).
Refer to display
items.

2-7
Performs zero adjustment for intermittent drive.

Refer to zeroadjustment.
* The time required
for execution differsfrom that for regularzero adjustment.
This zeroadjustment requires
additional time after
the 10-second
breakcorresponding to
the sensor
activation time forintermittent drive.

2-8
Switches to factory mode.
Not used by the user

2-9
Returns to user mode [1-0].

To [2-0]

43

<2-0 Test mode>
2-0
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]

44

<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 thealarm 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].

！ WARNING
Take care when operating, as the contacts will be active during alarm testing.

<2-0.2 Fault test>① Select [2-0.2].
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 [2-0.2].
Pressing the RETURN button during the fault test resets the setting and returns to [2-0.2].

Operation is thesame as for
fault alarms.

To [2-0.2]！ WARNING
Take care when operating, as the contacts will be active during fault testing.

45

<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].

All of the LEDs
and LCD lightup.
All lit46

<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.

FailedSuccessful[F-rO]:
ROM abnormality

47

Failed[F-rA]:
RAM abnormality<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.

① Select [2-1] on the menu screen.
② Press the ENTER button.
③ [CAL] is displayed, and zero adjustment automatically starts.
④ [PASS] is displayed if adjustment is successful, and the display automatically returns to [2-1].
* [FAIL] is displayed if adjustment was unsuccessful.

Successful

FailedAutomatically returns
to [2-1].

Return to [2-1].

48

<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 The reading blinks. Use the ▲ and ▼ buttons to adjust the gas concentration.
⑥ Press the ENTER button.
⑦ [CAL] is displayed, and gas adjustment automatically starts.
⑧ [PASS] is displayed if adjustment is successful, and the display automatically returns to [2-2].

After feeding gas,reading stabilizes, then
press

.

Use
and
to
adjust the reading.

49

Successful

FailedAutomatically returns
to [2-2].

Return to [2-2].

<2-4 Environmental settings 1>
Environmental settings 1 is used to set the various functions. (* We recommend keeping a record of the history whenchanging settings.)
Environmental settings 1 includes setting menus that are not normally used. Be careful to avoid accidentally changing
the settings.
2-4
Press the ENTER button.

2-4.0
Sets the operation when switching to UPS
operation with a UPS-equipped model. Use the▲ and ▼ buttons to select one of the following:
・ [on] (continuous operation)
・ [oFF] (off)・ [30it] (30 minutes continuous measurement
followed by intermittent measurement*)
・ [30oF] (30 minutes continuous measurement
followed by intermittent measurement)
Then confirm by pressing the ENTER button.
* Preset at the factory and not normally used by
the user.

2-4.1
Not used

2-4.2
Sets the alarm value.
Refer to alarm settings.

2-4.3
Sets the alarm delay time.
Use the ▲ and ▼ buttons to select the required
value (in seconds), then press the ENTER
button to set.
(Setting range: 0 - 60)
Refer to alarm resetpattern setting.

2-4.4
The screen for setting the alarm pattern.
This affects the device operation. Do not alter
for normal use.
(Default setting: Self-latching [L])50

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.

2-4.6
Sets the suppression value.
Use the ▲ and ▼ buttons to select the required
value, then press the ENTER button to set.

2-4.7
Sets the individual alarm contact ②.
Use the ▲ and ▼ buttons to select [AL] (gasalarm contact) or [FAU] (fault alarm contact),
then press the ENTER button to set.

2-4.8
Sets the individual alarm contact to energized orde-energized.

Individual alarm
contact
Energized/deenergized setting

2-4.9
Not used51

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.

2-4.E
Sets whether or not a password is used.

2-4.F
Screen for setting the sensor fault resetting
method.
This affects the device operation. Do not alter
for normal use.
(Default setting: Auto-reset [nL])

To [2-4.0]52

<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>
Measurement on time: Determined for each sensor. Settings cannot be changed.
(HW-6239: 30 s, other sensors: 15 s)
Measurement off time: Select from 10/30/60/90 mins.
After 30 minutes elapse after switching to the UPS, all of the lamps on the buzzer unit switch to blinking(two seconds on/two seconds off) to save energy.
Intermittent measurement (example)

Switch to UPS (battery)Sensor power on(measurement)

Repeat30 min.

10 min.

10 min.

Continuous measurement

Off time

Off time

Power on for 15 seconds for measurement.

[intr] is displayed for those channels using intermittent measurement (figure on right), and the POWER lamp
blinks.
The LCD screen brightness is also reduced to save energy.

If a gas is detected above the alarm setpoint level (or if a fault is detected), the system will switch to an alarmstate, all channels will switch to continuous operation mode, and an alarm will be issued.
With suction type models, the pump operates continuously, so no energy saving benefits are obtained even by
setting intermittent measurement. Similarly, flame detectors do not support intermittent measurement.
For a guide to the approximate continuous operation time using intermittent measurement, refer to the appendix.

53

<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.
The display automatically returns to [2-4.2] after setting.

Note:
The alarm setpoint icon appears only
when the alarm value is set to 25 %of the full scale.

Save setting.

<2-4.4 Alarm pattern>① Select [2-4.4] on the menu screen.
② Press the ENTER button.
③ Use the ▲ and ▼ buttons to select [L] or [nL]
④ Press the ENTER button to store the setting.
The display automatically returns to [2-4.4] after setting.

Set self-latching.

Set auto-reset.

54<2-4.8 Alarm contact energized/de-energized setting>① Select [2-4.8] on the menu screen.
② Press the ENTER button.
③ Use the ▲ and ▼ buttons to select [E-C] (individual alarm contact ①) or [AL-C] (individual alarm contact ②).
④ the ▲ and ▼ buttons to select [nd] (de-energized) or [nE] (energized).
⑤ Press the ENTER button to store the setting.
The display automatically returns to [2-4.8] after setting.

Individual alarm contact① is normallyde-energized.

Individual alarm contact ①
is normally energized.

Individual alarm contact② is normallyde-energized.

Individual alarm contact ②
is normally energized.

*NOTE
Setting to de-energized energizes the relay in the alarm state. (De-energized in normal state)
・ When using a contact, the setting is open under normal conditions and closed in the alarm state.
・ This behavior is reversed with b contact.
Setting to energized energizes the relay in normal state. (De-energized in alarm state)
・ 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.

55

<Environmental settings 2>
Environmental settings 2 is used to set the various functions. (* We recommend keeping a record of thehistory when changing settings.)
Environmental settings 2 includes setting menus that are not normally used. Be careful to avoid accidentallychanging the settings.
2-5
Press the ENTER button.

2-5.0
Adjusts heater current.

Refer to heater current
adjustment.

2-5.1
Not used

Detector type/target
gas selection

2-5.2
Selects the detector type and selects thetarget gas for the gas detector.

2-5.3
Alarm value limiter setting screen.
Do not alter for normal use. (Default setting: ON)

2-5.4
Sets the fault delay time.
Use the ▲ and ▼ buttons to select therequired value (in seconds), then press the
ENTER button to set.
(Setting range: 0 - 60)

56

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.

2-5.7
Adjusts the LCD backlight (green) brightness.
Use the ▲ and ▼ buttons to select therequired value, then press the ENTER button
to set.

2-5.8
Adjusts the LCD backlight (red) brightness.
Use the ▲ and ▼ buttons to select therequired value, then press the ENTER button
to set.

2-5.9
Sets the off time (time for which nomeasurements are performed) used whenintermittent measurement after 30 minutes ofcontinuous measurement has been selected
in UPS operation [2-4.0]. Use the ▲ and ▼buttons to select the required value (inminutes), then press the ENTER button toset.
Increasing this time extends the continuous
operating time.
* Preset at the factory and not normally usedby the user.

57

2-5.A
Not usedTo [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.
・ If [E-1] is displayed after initialization, either turn the power off and then back on again, or adjust
the heater in maintenance mode [2-5.0].

① Select [2-5.0] on the menu screen.
② Press the ENTER button.
③ The heater current is adjusted automatically.
④ Press the ENTER button after adjustment to return to [2-5.0].

Successful

Failed* The heater current value willvary depending on the sensor
installed.

Return to [2-5.0].

58

Return to [2-5.0].

<2-5.2 Detector type/gas number selection>① Select [2-5.2] on the menu screen.
② Press the ENTER button.
③ Use the ▲ and ▼ buttons to select [GAS] (gas detector) or [FirE] (flame detector).
If [GAS] is selected, use the ▲ and ▼ buttons to select the gas number.
(Setting range: 0 -)④ Press the ENTER button to store the setting.
The display automatically returns to [2-5.2] after setting.

Save setting.

Save setting.

！ CAUTION
・ Be sure to remove the sensor before changing the gas number. Turn off power after setting before
connecting the sensor. This will prevent damage to the sensor.
・ If a flame detector is selected, 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.

59

<Display items>
2-6
Press the ENTER button.

2-6.0
Displays the heater current.
Pressing the ENTER button displays
the current heater current.

* The heater current value willvary depending on the sensor
installed.

2-6.1
Displays the fault details in the form of
an error code.

2-6.2
When a flame detector is connected,
the 0 - 20 mA level is displayed.

To [2-6.0]60

8. Storage, Relocation, and Disposal
8-1. Procedure for storage or for extended periods without use
Store the product under the following conditions:・ At normal temperature and humidity in a location not exposed to direct sunlight・ In a location free of gases, solvents, and vapors
・ In a location free of vibration and impact

8-2. Procedures for relocation or reuse
When relocating the product, make sure that the new location conforms to the details described in ‘4-2.
Precautions regarding installation location’ and ‘4-5. Installation procedure’.
Also refer to ‘4-7. Wiring’ for information on wiring installation. Try to minimize the time for which the detector(sensor) and indicator are unpowered when relocating.

！ CAUTION
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.

61

9. TroubleshootingThis 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.
●: Lamp lit〇: Lamp unlit<Product abnormalities>
FAULT
Symptom/Display
lamp
The power cannot－
be turned on.

Abnormaloperation〇

Span adjustment is
not possible.

〇

Sensorabnormality
E-1●

Systemabnormality
E-9

●

Cause
The power switch
is turned off.
A fuse has blown.
The power supply
cable is incorrectly
connected.
Abnormalities or
instantaneousinterruptions in the
power supply
circuit
Cable abnormality(disconnection,loose connection,short circuit)
Effects of sudden
surge noise, etc.
Calibration gas
concentration
The sensor
sensitivity has
degraded.
Sensordisconnection or
short circuit insidethe detector
Heater adjustment
abnormality
Abnormality inmemory inside thedetector

ActionTurn on the power switch.
Investigate the cause of the blown fuse, takepreventive action, and replace the fuse.
Check the terminal board and reconnect correctly.

Supply the rated voltage.
Review the uninterruptible power source, power line
filter, and insulating transformer, then take additional
necessary measures.
Check the wiring for this product and the related
devices in the vicinity.

Turn off the power and restart.
If this symptom occurs frequently, take appropriate
measures to address the noise source.
Prepare appropriate calibration gas.
Replace the sensor.

Connect the cable correctly between the product andthe detector (sensor), or replace the sensor.
If [E-1] is displayed after initialization, turn the power
off and then back on again, or adjust the heater inmaintenance mode [2-5.0].
Contact RIKEN KEIKI.

62

<Reading abnormalities>
Symptom
The reading does not return
to normal levels after rising(or falling)

Cause
Sensor drift

ActionPerform zero adjustment.

Presence ofinterference gases

It is difficult to completely eliminate the effects ofinterference gases such as solvents. Contact RIKEN
KEIKI for information on countermeasures, such as
interference gas removal filters.
Trace amounts of the detection target gas may beleaking (slow leakage). Leaving this unchecked may
result in hazards. Take the same action as in theevent of a gas alarm.
Perform zero adjustment.

Slow leakage

A gas alarm is issued
despite the absence of agas leak or otherabnormalities at thedetection point.

Environmental
fluctuations
Presence ofinterference gases

Effects of noise

Suddenenvironmental
changes

Slow response

Span adjustment is notpossible.

Clogged dust filter
Bent or blocked inlet
or outlet tube
There iscondensation inside
the inlet tube.
The sensor
sensitivity has
degraded.
The calibration gas
concentration isinappropriate.
The sensor
sensitivity has
degraded.

It is difficult to completely eliminate the effects ofinterference gases such as solvents. Contact RIKEN
KEIKI for information on countermeasures, such as
interference gas removal filters.
Turn off the power and restart.
If this symptom occurs frequently, take appropriate
measures to address the noise source.
If the environment (e.g., temperature) changes
suddenly, the product may not respond adequately. In
certain cases, a reading alarm may be issued.
The product cannot be used if sudden environmental
changes occur frequently. Take appropriate action.
Replace the suction type detector or calibration gas
pump dust filter.
Repair the location affected by the problem (suction
type detector or calibration gas pump).
Repair the location affected by the problem (suction
type detector or calibration gas pump).
Replace with a new sensor.

Prepare appropriate calibration gas.

Replace with a new sensor.

63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. 3.8 kg
4-point type: Approx. 395 mm (W) × 290 mm (H) × 73 mm (D), approx. 4.9 kg
6-point type: Approx. 485 mm (W) × 290 mm (H) × 73 mm (D), approx. 5.9 kg
8-point type: Approx. 575 mm (W) × 290 mm (H) × 73 mm (D), approx. 6.4 kg
10-point type: Approx. 665 mm (W) × 290 mm (H) × 73 mm (D), approx. 7.1 kg
12-point type: Approx. 755 mm (W) × 290 mm (H) × 73 mm (D), approx. 7.9 kg* Weights include the base unit (buzzer, 2-point type indicator, UPS battery) and indicator/alarm
unit.
・ Exterior drawings:

Base unit

Indicator unit (2-point type)Ø21.5 × (n + 2)
Cable access hole (punch out for use)

Ø7 mounting holes (case rear)

Mounting dimension

Number of points[(n/2)+1] pcs.
Back cable entry

Wall mounting dimensions
Number ofpointsCutout holedimension A

Rack mounting panel cutout dimensions

64

M6 or φ7
2–8 points: 4pcs. 10-12 points: 6pcs

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, resistanceload)
・ General alarm voltage output: Voltage for normal operation: 6 V (load current 10 mA or less)Gas alarm:
12 V (load current 10 mA or less)Trouble:0V・ External buzzer contact output: No voltage a or b contact(Contact capacity: 250 V AC, 1 A (resistance load))
・ External buzzer power supply output: 24 V DC (load current 10 mA or less)・ Display:
Character LCD (red/green two-color bar meter display)
Lamps (power lamp (green), battery lamp (orange), alarm lamp(red))
Battery level meter (five LED lamps)
Automatically illuminates when switching from mains power supply
to UPS power supply
・ Alarm type:
Alarm lamps, self-latching, buzzer (optional voice alarm)・ Power supply input:
100 - 120 V AC or
200 - 240 V AC (50/60 Hz)
・ Operating temperature/humidity range: -10 - +50 °C (no sudden fluctuations), 10 - 90 %RH (nocondensation)* Operating ambient humidity for the optional voice unit is
85 %RH or less.
・ Detection operation using UPS:
Continuous detection (continuous power supply), off,intermittent measurement after 30 mins of continuous
measurement, or off after 30 mins of continuous
measurement
・ External connection terminals: 13 pins (one pin not used)
Power input
3 pinsGeneral alarm contact output
3 pinsGeneral alarm voltage output
2 pinsExternal buzzer contact output
2 pinsExternal buzzer power supply output 2 pins
Unused terminal
1 pin

Modular type (up to five indicator units can be used together)Lead storage batteries: 12 V, 2.3 Ah × 2
Over-discharge protection circuit
Depends on detector and settings. Refer to the appendix.
UPS operating time (continuous operation)
60 h

50 h
UPS operating time (continuous operation)

2. UPS battery
・ Construction:
・ Batteries:
・ Other functions:
・ UPS operating time:

40 h

30 h

20 h

10 h

0h
Power consumption

65

66

3. Indicator unit
・ Construction:
・ Concentration display type:・ Individual alarm contact output:(2-point type)・ External connection terminals:

2-point type (individual unit), modular type
Character LCD (red/green two-color bar meter display)
No voltage a or b contact(Contact capacity: 250 V AC, 2 A (resistance load))
10 pins
Detector input/output
4 pinsPump and flame detector (option) power supply output (24 V DC)
2 pinsIndividual alarm contact output 1 (Gas alarm) 2 pins
Individual alarm contact output 2 (Gas alarm or fault alarm)
2 pins・ Alarm delay:
Two seconds or up to 60 seconds in one second increments
・ Other functions:<Alarm test>
Alarm operation check<Gas concentration peak display>
Gas concentration peak value retained on bar
meter display when gas concentration exceeds
alarm setting.
・ Power supply:Supplied from base unit
・ Cables between detectors:
CVV 4-core or equivalent cable・ Transmission distance between detectors:
Max. 300 m using CVV (0.75 mm2) cableMax. 500 m using CVV (1.25 mm2) cableMax. 500 m using CVV (2.0 mm2) cable* For more information on the flame detector (40/40 series)
connection, refer to the operating manual.

10-2. Accessory list
・ Operating manual:
×1
・ Rack mounting fittings:
Number included will differ depending on number of units.
(Provided only with rack-mounted type)
2- to 8-point type×4
10/12-point type×667

11. Terminology

%LEL

ppm
Calibration
Maintenance mode

Initialization

Zero suppression
Alarm delay time
Alarm delay time

Inhibit

The concentration of a combustible gas expressed as a percentage of thelower 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.
Indicates gas concentration in units of parts per million by volume.
Determining correlation between product readout values, display values, andsetting values with actual values using calibration gas.
During product maintenance, the alarm contacts are cut off, and the external
output signal outputs a signal indicating the product is in maintenance mode.
This enables the device to be isolated for maintenance.
During the few seconds after turning on the power, the readings are unstable.
Alarm contacts are cut off during this time to prevent errors. The external
output sends a signal indicating the product is in initialization mode.
This function makes fluctuations in ambient conditions and interference gas
less noticeable.
This is the function for temporarily suspending activation to prevent false
alarms caused by external noise.
The time until an alarm occurs when gas is provided at 1.6 times the alarm
setpoint.
(This excludes pipe-related delays when connected to external suction
piping.) The maximum alarm delay time for the product is 30 seconds.
This temporarily suspends the gas detection function during productmaintenance. This is also called "point skip," which has the same function.

68

* Appendix Power consumption calculation method and UPS operating time quickreferral table
The power consumption for the GP-148 can be calculated using the following table as a guide:(1) Power consumption for commercial power supply to main unit (VA)
Continuous
detection

Item

A

Base unit

B
C
D
E
F
G
H

Indicator/alarm unit (two channels per unit)
Isobutane sensor (HW-6211/NC-6211)
Methane sensor (HW-6239/NC-6239)
Hydrogen sensor (NC-6244A)
Suction type detector (DC model)
Flame detector (Sharp Eye 40/40 Series)
Charging operation for UPS (battery)-equipped model

15.3 (VA)* Including indicator unit (two channels per unit)

1.3 (VA)
3.8 (VA)
2.8 (VA)
1.8 (VA)
33.0 (VA)
34.0 (VA)
17.3 (VA)(2) Power consumption when using UPS battery (W)Continuous
detection

Item
A

Base unit

B
C
D
E
F
G

Indicator/alarm unit (two channels per unit)
Isobutane sensor (HW-6211/NC-6211)
Methane sensor (HW-6239/NC-6239)
Hydrogen sensor (NC-6244A)
Suction type detector (DC model)
Flame detector (Sharp Eye 40/40 Series)

0.3 (W)* Including indicator unit (two channels per unit)

0.2 (W)
1.3 (W)
1.0 (W)
0.7 (W)
8.7 (W)
9.6 (W)〔Calculation equation〕
GP-148 (-point type)
Base unit and indicator unit
① A + B ×

Detector total:unit(s) (up to 5 units) =

(W)

units

Isobutane sensor② C ×
unit(s) =(W)
Methane sensor③ D ×
unit(s) =(W)
Hydrogen sensor④ E ×
unit(s) =(W)
Suction type detector (DC model)⑤ F ×
unit(s) (up to 4 units) =Flame detector⑥ G ×
unit(s) (up to 6 units) =UPS charging (for UPS-equipped models)⑦ H
Power consumption ①＋②＋③＋④＋⑤＋⑥ =

69

(W)
(W)

(W)

Operating time using UPS
The table below lists the approximate operating times for continuous operation using the UPS under thefollowing conditions.
Details are provided here for typical sensors. Please contact RIKEN KEIKI for more information.
Detector: HW-6211/NC-6211 (diffusion type)
Cable length: 1.25 sq/100 m
Battery: Fully charged state
Ambient temperature: 25 °C
Operation: No alarm activation
Intermittent measurement setting (15 seconds
on/10 minutes off)
No voltage output load connected

Detector: HW-6239/NC-6239 (diffusion type)
Cable length: 1.25 sq/100 m
Battery: Fully charged state
Ambient temperature: 25 °C
Operation: No alarm activation
Intermittent measurement setting (30 seconds
on/10 minutes off)
No voltage output load connected

Detector: NC-6244A (diffusion type, H2/F.S. 2,000 ppm)
Cable length: 1.25 sq/100 m
Battery: Fully charged state
Ambient temperature: 25 °C
Operation: No alarm activation
Continuous operation setting
No voltage output load connected70

HW-62112-point
type
4-point
type
6-point
type
8-point
type
10-point
type
12-point
type

HW-62392-point
type
4-point
type
6-point
type
8-point
type
10-point
type
12-point
type

NC-6244A
2-point
type
4-point
type
6-point
type
8-point
type
10-point
type
12-point
type

Continuous
operation
Approx.
16 hours
Approx.
8 hours
Approx.
5 hours
Approx.
4 hours
Approx.
3 hours
Approx.
2 hours

Intermittent
measurement
Approx.
136 hours
Approx.
85 hours
Approx.
60 hours
Approx.
46 hours
Approx.
37 hours
Approx.
30 hours

Continuous
operation
Approx.
20 hours
Approx.
10 hours
Approx.
6 hours
Approx.
5 hours
Approx.
4 hours
Approx.
3 hours

Intermittent
measurement
Approx.
123 hours
Approx.
75 hours
Approx.
53 hours
Approx.
41 hours
Approx.
33 hours
Approx.
27 hours

Continuous
operation
Approx.
30 hours
Approx.
15 hours
Approx.
10 hours
Approx.
7 hours
Approx.
6 hours
Approx.
5 hours

Intermittent
measurement
—
—
—
—
—
—

Revision History
Issue

Revision

0First issue (PT1-1170)

1

Appendix added; other minor corrections (PT1-1171)

2

Corrected weight

Issue dateJune 5, 2023
December 13, 2023
April 8, 2024