PC1E-0411

With both smart looks and functioning
The GP-148 is easy to read and easy to use for peace ofmind, even in the event of power outages. This single unit
supports a wide range of applications and monitoring points
to meet the needs of users in wide-ranging combustible
gas scenarios.

Combustible Gas
Detection Alarm System

MODEL:GP-148■ Easy to read: At-a-glance identification of detection status■ Easy to use: Simple, straightforward operation■ Provides peace of mind even in the event of power outages: Built-in UPS allows continuous gas leak monitoring for atleast three days even during power outages.
Peace of mind, even during emergencies.
■ Permits combined monitoring using gas detectors and flame detectors.
■ Allows users to select up to 12 detection points.
■ Features two contacts. Enables combined use of revolving lights and buzzers.
■ Ideal for combustible gas leak monitoring at LPG, CNG, and H2 filling stations

Easy to read and easy to use for peace of mind
even in the event of power outages
01 Easy to read: At-a-glance identification of detection status
Two-color bar meter display allows detection status to be checked even from adistance.
Bar meter display

02

NormalEasy to use: Simple, straightforward operationGreenGas alarm

RedUse the CHECK MODE button to switch all indicator units to maintenance mode.
Maintenance mode operations are also simple and straightforward.

▶ Maintenance procedure
CHECK
MODE
Hold down theCHECK MODE
button to switch tomaintenance mode.

Slide the center selector switch tothe desired channel.

OFFON

M

CH1

OFF CH2

OFFON

ALARM
TESTAlarm test:

Press RETURN to confirm that an alarm is triggered.

Zero adjustment:

PressZEROto start automatically. Adjustment is successfulwhen [PASS] is displayed.
(Perform with the detector exposed to fresh air.)
SPAN

Span adjustment:

Pressand expose to calibration gas.

Use theandHold down theCHECK MODE
button to return
to measurementmode.

buttons to adjust to the actual gas

concentration, then press ENTER .
Adjustment is successful when [PASS] is displayed.
ALARM
POINT

Alarm point check: Displayed by pressing.

peace of mind even in the event of power outages: Built-in UPS allows continuous gas leaka Provides
03
monitoring for at least three days even during power outages.
The product is available with a built-in UPS (uninterruptible power system) battery.
This enables gas leak monitoring even if power goes out.

Peace of mind, even during emergencies.

Uninterrupted time (guideline figures)With six diffusion type detectors (LPG: 0 - 100 %LEL): Approx. 330 minutes continuous measurement
When set to intermittent measurement*1, gas leakage monitoring is possible for approximately 3.4 days*2.
*1: When fully charged, at 25 °C, no alarm operation, intermittent measurement setting (15 seconds on/90 minutes off), voltage output no load
*2: Intermittent measurement settings are possible only for 0 - 100 %LEL.

Monitoring operations can be enabled individually for each detector when operating from the UPS. This allows efficient monitoring of vital areas
during power outages.
ExampleWithout backup

With backup

Consumption equipment

Manufacturing equipment (vital area)

This single unit supports a wide range ofapplications and monitoring points.
Flame detector display (example)

01 Permits combined monitoring using gas detectors and flame detectors.
Allows connection to both flame
detectors and gas detectors.
This single unit can be used for
combined monitoring at facilities
such as hydrogen stations with both
combustible gas detectors and flame
detectors installed, reducing costs.

02Diffusion typegas detector
GD-A80

Suction typegas detector
GD-D58Flame detector
40/40 Series(Manufactured by Emerson)* Flame detectors are soldonly within Japan.

Normal state

Alarm

Allows users to select up to 12 detection points.

Connecting cases allow easy expansion of indicator units for configurations numbering from two to 12 points.

GP-148 (4-point type)03Indicator unit

GP-148 (12-point type)04 Ideal for combustible gas leak monitoring

Features two contacts.
Enables combined use of revolving lights and buzzers.

Two alarm contacts are output from each indicator unit. Revolving
lights and buzzers can be operated simultaneously in alarm state,eliminating the need to add external relays.

at LPG, CNG, and H2 filling stations.
This product can be used to monitor for leaks of the combustible
gases typically used at LPG filling stations, CNG filling stations,hydrogen stations, and other plants.

Indicator unit terminal board layout diagram⑩⑨⑧⑦⑥⑤④③②①

EX-CONTACT

ALARM

GP-148 target gas list

Individual alarm contact 2(Gas alarm (standard) or fault alarm (option))

Individual alarm contact 1(Gas alarm)

DETECTOR

Revolving light−PUMP
POWER+DC-OUT* Contact capacity: 250 V AC, 2 A each (one-step alarm)

Buzzer

Detection target
gas name
Isobutane
LPG
Town gas
Methane
LNG
CNG
Town gas
Methane
LNG
CNG
HydrogenHydrogen
PropaneTolueneAcetylene
Gasoline

Displayed Detection
text
range
i-C4H10100
LPG
13 A
CH4100
LNG
CNG13 A12500
CH4(Displayed asLNG1250)
CNG
100
H22000H2100
C3H8100
C7H8100
C2H2GASOLINE
100Units

1 digit%LEL

1%LEL

1ppm

100%LEL

1ppm

10%LEL

1%LEL

1%LEL

1%LEL1* For information on other gas types and measurement ranges, please contact Riken Keiki.

Specifications
ModelDetection target gas
Compatible detectors
DisplayGas alarm pattern/indication
Fault alarm pattern/indication

External output

GP-148Combustible gas, hydrocarbon flames, non-hydrocarbon flames
Diffusion type gas detectors (GD-A80), suction type gas detectors (GD-D58), flame detectors (40/40 Series)*1
Character LCD (red/green two-color bar meter display), lamps, battery level meter (five LED lamps)
Self-latching or auto-reset
Base unit: Red lamp lit
Indicator unit: Red lamp flashing or lit (after resetting)Continuous buzzer or continuous buzzer + audible message (optional)
Auto reset
Indicator unit: Orange lamp lit, fault detail (error code) display
Intermittent buzzer or intermittent buzzer + audible message (optional)
General alarm contact output: No-voltage 1c contact (contact capacity: 250 V AC, 2 A)
General alarm voltage output: Voltage output 0 - 6 - 12 V DC (10 mA or less)
GeneralExternal buzzer contact output: No-voltage 1a or 1b contact (contact capacity: 250 V AC, 1 A)
External buzzer power supply output: 24 V DC, 10 mA or less
Individual Individual alarm contacts*2: No-voltage two contacts (contact capacity: 250 V AC, 2 A), a or b contacts

Alarm delay
Indicator/alarm unit
Power input
Lightning protection
UPS*3
Construction
Operating temperaturerange
Operating humidity range
External dimensions/weight(Including UPS)
Cable length (Indicator/alarm unit - detectors)
Exterior color

2 seconds or up to 60 seconds in 1-second increments
Two points per unit
100 - 120 V AC or 200 - 240 V AC, (50/60 Hz)
Lightning surge protection circuit
Lead storage batteries, 12 V, 2.3 Ah × 2
Wall-mounted or rack-mounted-10 - +50 °C (no sudden fl uctuations)
10 - 90 %RH (no condensation)
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
Max. 300 m using CVV (0.75 mm2) cableMax. 500 m using CVV (1.25 mm2, 2.0 mm2) cable
Lower door: Light gray (Munsell N7.2)
Other parts: Black*1: Flame detectors are sold only within Japan.
*2: Choice of gas alarm contact + gas alarm contact or gas alarm contact + fault alarm contact*3: When UPS-equipped model is selected

Exterior drawings
GP-148 (4-point type)

Accessories• Rack-mounting retaining fixtures (rack-mounted modelsonly)

Optional accessories• Fuses × 2 (5 A, ø5 × 20 m)

Distributed by:
2-7-6 Azusawa, Itabashi-ku, Tokyo 174-8744, Japan

Phone : +81-3-3966-1113
Telefax : +81-3-3558-9110
E-mail : intdept@rikenkeiki.co.jp
Web site : https://www.rikenkeiki.co.jp/english※ The contents described in this catalog are subject tochange without notice according to the performance
improvement.

PC1E-0411-240400