Riken Keiki GP-148 User manual

PT1E-1170
Combustible Gas Detection Alarm System
GP-148
Operating Manual

1
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. Product Functions ................................................................................................................................6
3-1. Exterior drawings...........................................................................................................................6
3-2. Device configuration and names ...................................................................................................7
3-3. Mounting diagram ..........................................................................................................................9
3-4. Part names and functions ............................................................................................................10
3-4-1. Base unit (buzzer).................................................................................................................10
3-4-2. Indicator unit (same applied to base unit indicator)...............................................................11
3-5. Block diagram..............................................................................................................................12
4. Usage Instructions..............................................................................................................................13
4-1. Usage note ..................................................................................................................................13
4-2. Precautions regarding installation location ..................................................................................13
4-3. System design precautions..........................................................................................................14
4-4. Grounding....................................................................................................................................17
4-5. Installation procedure ..................................................................................................................18
4-5-1. Wall mounting installation procedure ....................................................................................18
4-5-2. Rack mounting installation procedure ...................................................................................19
4-6. Device connection .......................................................................................................................20
4-6-1. Power supply connection ......................................................................................................20
4-6-2. Connecting to contact outputs...............................................................................................20
4-6-3. Connecting to the 0 - 6 - 12 V DC output ..............................................................................20
4-7. Wiring ..........................................................................................................................................21
5. Operation method...............................................................................................................................23
5-1. Preparations for startup ...............................................................................................................23
5-2. Basic operating procedures .........................................................................................................23
5-3. Startup procedure ........................................................................................................................24
5-4. Detection mode ...........................................................................................................................25
5-4-1. Display operations ................................................................................................................25
5-4-2. External output (general alarm output voltage) operation .....................................................
27
5-4-3. Alarm test..............................................................................................................................27
5-4-4. Alarm setpoint confirmation...................................................................................................28
5-5. Check mode ................................................................................................................................29
5-5-1. Check mode procedures.......................................................................................................29
5-6. UPS operation (* for UPS-equipped models)...............................................................................31
5-6-1. Functions ..............................................................................................................................31
5-6-2. Display and operations .........................................................................................................31
5-6-3. UPS operation settings .........................................................................................................32
5-7. Shutdown procedure....................................................................................................................32
6. Operations and Functions ..................................................................................................................33
6-1. Gas alarm pattern ........................................................................................................................33
6-2. Fault alarm pattern.......................................................................................................................34
6-3. Gas alarms caused other than by gas detection..........................................................................35
6-4. Functions .....................................................................................................................................35

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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. Procedures for relocation or reuse...............................................................................................60
8-3. Product disposal ..........................................................................................................................60
9. Troubleshooting..................................................................................................................................61
10. Product Specifications ......................................................................................................................63
10-1. Specifications.............................................................................................................................63
10-2. Accessory list.............................................................................................................................65
11. Terminology ......................................................................................................................................66

3
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. We recommend that both first-time users and those
with previous experience with the product carefully read this manual to confirm their understanding of specific
information and to refresh their familiarity with the product.
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 for
quantitative/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 the
air.
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 (1-step gas alarm contact + 1-step gas
alarm contact or fault alarm contact).
・The base unit includes a general alarm contact, general alarm voltage output (0 - 6 - 12 V DC), external
buzzer contact output, and 24 V DC (load: 10 mA or less) voltage output.
・This product can be used with an internal uninterruptible power system to enable operation to continue 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 This indicates that improper handling of the product may result in death, severe
injury, or serious property damage.
WARNING This indicates that improper handling of the product may result in severe injury or
serious property damage.
CAUTION The CAUTION symbol indicates that improper handling of the product may result
in minor injury or minor property damage.
*NOTE The NOTE sign indicates recommendations for product handling.
！
！
！

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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 and
fuses. Do not operate the device if you suspect any potential defects in protective functions, such as the
protective grounding.
・Fuse
Use 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 maintenance
Be 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.
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！

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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.
・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 5 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 other
devices.
・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. Use the product correctly in
accordance 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.
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6
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)
ＰＰ１Ｐ２
□
2 305 297 276
□
4 395 387 366
□
6 485 477 456
□
8 575 567 546
□
10 665 657 302 334
□
12 755 747 308 418
点数ｎ Ｗ Ｗ1 取付寸法
Number of points Installation procedure

7
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).
In addition to the indicator, the base unit includes a switching regulator and UPS (uninterruptible power system)
battery.
* For UPS-equipped model
<Appearance>
Base unit
Indicator unit
Indicator (two-point type)Buzzer

8
<Base unit interior>
① Switching regulator Power supply unit generating a voltage of 24 V DC from the AC power
supply
② UPS battery Battery providing an uninterruptible power supply when the main
power supply is unavailable due to power outage or other reasons*
③ Main power switch Turns the main power supply (AC power supply) on and off.
④ System power switch Switch for turning the GP-148 on.
⑤ Pump (external supply)
switch
Switch for turning on the power to the pump (or optional flame
detector).
⑥ Voice unit connector Connector for connecting to the optional voice unit.
* For UPS-equipped model
②UPS battery*
①Switching regulator
⑤Pump (external
supply) switch
③Main power switch
⑥Voice unit connector
④System power switch

9
3-3. Mounting diagram
Rack mounting panel cutout diagram
Wall mounting type
Number
of points
Installation procedure
M6 or Ø7
2 - 8 point configuration: 4 locations
10/12-point configuration: 6 locations
Rear cable inlet
Rack-mounted type
Number
of points
Cutout hole
dimension A
Wall-mounting installation

10
3-4. Part names and functions
3-4-1. Base unit (buzzer)
No. in
figure Name Function
① 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) Lights up when the UPS is operating. Blinks during a battery
discharge test.*
④ Battery check button Used to perform a battery discharge test. Hold down to start. Hold
down again to end.*
⑤ Alarm lamp (red) Lights up red when a gas alarm occurs. Goes out when the alarm
is reset.
⑥ Buzzer The buzzer sounds when an alarm or fault occurs.
⑦ Buzzer stop button
Silences the buzzer. Hold down the button when the buzzer is not
sounding to sound the buzzer. Hold down while the buzzer is
sounding to alter the volume level. (Three levels)
⑧ Alarm reset button
Press to reset the gas alarm pattern. If the alarm pattern is
self-latching, press the reset button to switch from self-latching to
auto-reset.
⑨ Check button Hold down to select check mode. Hold down again to exit check
mode and return to measurement mode.
* For UPS-equipped model
①Power lamp (green)
③Battery lamp (orange)
②Battery voltage bar meter (green/orange)
④Battery check button
⑦Buzzer stop button
⑧Alarm reset button
⑤Alarm lamp (red)
⑥Buzzer
⑨Check button

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3-4-2. Indicator unit (same applied to base unit indicator)
No. in
figure Name Function
① LCD display Displays the gas concentration and status.
② Power lamp This is the power lamp.
③ Alarm lamp Lights up when a gas alarm occurs.
④ Fault lamp Lights up when a fault occurs.
⑤ Alarm test button Used for adjustment.
⑥ ZERO/▲button
ZERO: Used to start zero adjustment in check mode.
▲: Used to select items in maintenance mode, to
increment/decrement the reading during span adjustment, and
to increment/decrement the reading during alarm testing.
⑦ SPAN/▼button SPAN: Used to start span adjustment in check mode.
▼: Used in the same way as ⑥.
⑧ ALARM POINT/ENTER button ALARM POINT: Used to confirm alarm setpoints.
ENTER:Used to confirm selection items in various modes.
⑨ Power switch Power switches for CH1 and CH2.
⑩ Selector switch Selects the channel (left/right) to which button operations apply.
The power lamp lights up orange when selected.
⑪ Individual alarm contact output
2
Can be used as gas alarm or fault alarm contacts.
(Normally used as gas alarm contacts）
⑫ Individual alarm contact output
1 Can be used as gas alarm contacts.
⑬ Sensor terminals Used to connect detectors.
⑭ Pump (external output) power
supply
Power supply terminals for suction type detector pumps or
flame detectors (option).
③
⑦
⑧
②
①
⑤
⑥
⑪
⑬
⑭
④
⑨
⑩
⑫
CH1 CH2

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3-5. Block diagram
Main power input
100 - 120 V/
200 - 240 V AC
(50 Hz/60 Hz)
Power
supply unit
Alarm processing unit
General alarm contact
Voltage output
(0 - 6 - 12 V/24 V DC)
External buzzer
contact
Power control
unit
For UPS
Battery
12V 2.3Ah
× 2
Switching power
Indicator control unit
CH2: Amp unit
CH1: Amp unit
Detectors Detectors
Buttons
ALARM TEST
(RETURN)
ZERO/△
SPAN/▽
ALARM POINT
(ENTER)
CH2
Alarm processing unit /
External signal processing
・Individual alarm contact
Base unit
CH1
LED
POWER
BATT.
ALARM
Button
Check
LED
POWER ALARM FAULT POWER ALARM FAULT
Operation target Operation target
Buzzer
Buttons
BATT.
CHECK
BZ. STOP
RESET
Buzze
r
Indicator
LED
BATT. VOLTAGE
General control
unit
Fuse
Surge
absorber
Gas concentration level
display
Gas concentration level
display

13
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 other
liquids.
・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 to 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 the
system must be detached to allow maintenance; where the product cannot be removed due to the
presence of pipes or racks; or in other such locations. Do not install in locations where maintenance
work 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.

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

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(3) Lightning protection
What is
lightning surge?
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.
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.
Lightning
protection
While it is not possible to protect completely against disasters caused by lightning,
the following protective measures can be taken: Take appropriate measures based
on 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 be
installed before the field devices and central processing equipment to protect
against the possibility of inductive lightning surges transmitted through the
cables. For usage details, contact the manufacturer of the lightning arrester.)
Grounding 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 external
buzzers and alarm indicators.
Do not use for other purposes, such as for control purposes — for example, to control shutoff valves.
CAUTION
A de-energized b contact (break contact) may cause a momentary open operation due to
physical 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 a
delay operation (of approximately 1 second) to the signal on the b contact receiving side.
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. (In
particular, 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 relay
that runs on low voltage (less than 100 V AC) and a suitable surge protector (CR
circuit, 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.
・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.
Coil
Load
SK1 SK2
Power
source
Power
source
Alarm contact
GP-148 External relay
(low-voltage relay)
* SK1, SK2: Surge absorbers

17
4-4. Grounding
Connect the grounding terminal to the grounding terminal provided at your location.
Be sure to ground the product before turning on power for the product.
Be sure to provide grounding. This is required for stable operation and
safety of the devices. Never connect the grounding wire to a gas pipe. Use
grounding equivalent to Class D grounding (grounding resistance 100 Ωor
less).
WARNING
Terminal

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.
<For 10-/12-point configuration>
Attach the mounting screws at the four positions in each corner and also the two positions on the
indicator 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 (× 4)
Mounting holes (× 6)

19
4-5-2. Rack mounting installation procedure
①Mount the GP-148 into the mounting hole.
②Open 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). 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.
③Attach the rack mounting fittings B to the four (or six) locations described in step ②above, then
tighten 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.
Rack mounting fitting A
Rack mounting fitting B
Slide toward you
* For more information on the mounting
procedure, refer to ‘3-3. Mounting diagram’.