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Combustible Gas Detector with LED Display

The HM-712NSZ series combustible gas detector has high stability. It is for detection of combustible gas leakage to prevent the gas leakage causing great damage. By adopting the international famous brand high-stability catalytic combustion type sensor, the product shows the superiority of strong stability and small sensitivity drift. It can work on wide voltage range of AC100V-AC240V. The product can also be mounted with the backup 9V Ni-MH rechargeable battery. When the battery power is insufficient, the product can remind the user of that.

The combustible gas detector is also available with LED display for alarm concentration and battery power digital display. The LED display starts to show the data when the gas concentration is higher than 1000ppm. In general, the product is suitable for application in places where the combustible gas may leak.

Operation Instruction
1. After connecting the power source line, the power source indicator lights always. The buzzer emits the di sound once. And the character on the LED display appears circularly. The circuit enters the warm-up state lasting for 3 to 5 minutes. After that, the LED display stops flashing, and the product gets into the normal standby state.

If the external AC power source is off, the combustible gas detector would automatically switch to backup battery power supply. The LED display would show the letter b every 10 seconds. When the battery voltage is low, the buzzer of the product would make the di sound once with the interval of 40 seconds and the yellow LED indicator flashes.

2. After the test button is pressed down, the product would give out the sound like di……., and the red LED indicator flashes.

3. When the internal sensor breaks down, the yellow LED indicator would light always and the buzzer would sound continuously. In this case, the user should disconnect the power source and then connect the power source after ten minutes.

4. Connect the red output line with the positive pole, and the black output line with the negative pole of electromagnetic valve. The function can be effective only when the electromagnetic valve output lines are available.

Technical Specification
Model HM-712NSZ-AB HM-712NVSZ-AB HM-712NFSZ-AB
Type Independent Type Independent Type with 12V Pulse Output to Drive Electromagnetic Valve Independent Type with Normally Open Relay Output to Drive Fan
Operating Voltage AC100-240V (Optional with 9V Ni-MH Rechargeable Battery)
Sensor NEMOTO Catalytic Combustion Type Sensor
Alarm Concentration 2500ppm±1500ppm
Concentration Detection Range (Display Range) 1000ppm-9999ppm
Alarm Sound Pressure 85dB/3m
Alarm Output Not Available 12V Pulse Output Normally Open Relay Output
Alarm Resetting Automatic resetting when there is no combustible gas
LED Display Screen Display Gas Level since 1000ppm
Indicator AC Power Source: Green LED Indicator Normally on
Alarm: Infrared LED Indicator Flashing
Sensor Fault: Yellow LED Indicator Normally on
Working Environment Temperature Range: -10℃ ~ +55℃
Humidity Range: 10%~95% RH (No Condensation Phenomenon)
Dimension 118.5×82×43mm

Related Names
Combustible Gas Detection Alarm | LPG Detector | Gas Fume Detector

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