Gas Detection and Alarm Systems

Simple Multi-point Type Gas Alarm System B-770


  • Simple multi-point type (max. 3 points) gas alarm system for LPG or Town gas.
  • Affordable, compact and easy to operate.
  • Easy installation and maintenance.
  • Pre-calibrated smart sensor for immediate installation.
  • Several type of connectable gas detectors to match your installation site.
  • Variety of signals outputs to meet customers needs.
  • Built-in self-diagnostic function.


(Alarm Unit)

Model B-770
Alarm Indication Flashing red lamp (illuminated after alarm shut-off), alarm sound, non-latching

(can be set to latching using DIP switch)

Alarm Volume 70 dB/m min.
Alarm Shut-off By pressing a button
Malfunction Indication Flashing yellow lamp
Display of alarm unit


Illuminated green lamp
Power Source 100 VAC to 220 VAC, 50/60 Hz (Terminal block type)
Power consumption Approx. 5W when monitoring (max.)
Approx. 10W during alarm (max.)
External output 1) 2-stage voltage (6 VDC when monitoring, 12 VDC during alarm, 0 V during error)
2) 100 VAC to 220 VAC during alarm, 1A max. (35-second output delay,can be changed to immediate output with DIP switch)3) 1a, 1b contacts 220 VAC, 1A max., or 2 4VDC, 1A max. (35-second output

delay, can be changed to immediate output with DIP switch)

Operation Temperature
-10 to +40 °C
Dimensions W138 x H230 x D45 mm
Weight Approx. 480g
Accessories Inspection gas, Mounting plate, Wood screws, Crimp terminals, Hex wrench



Model KD-5GM KD-5G GD-1B
Detection Principle Catalytic combusion type (energy-saving type)
Gas Detected Town gas LPG LPG
Gas Concentration fo alarm 1/100 to 1/4 of LEL (1%LEL to 25%LEL)
Response time 1 minute max.
Power Source 24 VDC ±20% (Supplioed from the B-770)
Maximum Loop Length 500m max. (CVV 1.25mm2, 3-conductor cable) 200m max. (using

0.5mm2, 3-conductor


Sampling Method Diffusion
Explosion-proof Structure d2G4
Operating Temperature Range -10 to +60 °C -10 to +45 °C

(excluding protrusions)

W94 x H141 x D123 mm W43 x H116 x D37 mm
Weight Approx. 1.5kg Approx. 220g
Mounting method Screws Mounting plate and bands
Accessories Stand, Rain cap, Rain cover, Screws, Curled plugs,

Crimp terminals

Mounting plate, Wood

screws, Bands,

Connectors, Curled plugs,
Crimp terminals

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