Methane gas detector Homplex HD100 front view Homplex HD100 wall mounted methane gas detector Methane gas detector Homplex HD100 right side view Methane gas detector Homplex HD100 packaging


The HD100 methane gas detector is a state-of-the-art device designed and built with a strong emphasis on safety.

The detector is designed to work with either Normally Open or Normally Closed solenoid valves, making it ideal for residential premises. The alarm is fast and the solenoid valve triggering is immediate. It allows multiple detectors to be connected to a single solenoid valve for gas shut-off.

The Homplex gas detector is made in Romania and is one of the best selling and longest lasting products in the portfolio.

Need help or more information? Contact a Homplex specialist now!




HD100 Strong alarm
Powerfull alarm You'll hear it immediately when it triggers the alarm/electrovalve thanks to the 85 decibel piezo siren!
HD100 Alarm 10% L.E.L.
10% L.I.E. alarm threshold Increased sensitivity thanks to the high performance SN02 sensor.
HD100 Quick release
Quick release The detector will trigger the solenoid valve just 10 seconds after the sensitivity threshold is exceeded.
HD100 NC or NO 230V?
NC or NO 230V? The detector can control normally closed or normally open solenoid valves powered at 230V.
HD100 Speed of activation
Speed of activation It only takes 15 seconds from power up to methane gas detection activation!


Detected gas
CH4 methane
Alarm trigger threshold
10% L.E.L.
Sensor type
SnO2 semiconductor
Sensor lifespan
min. 5 years
Solenoid relay contact output
NI/ND max. 8 A la 250 VAC
Alarm siren
Piezoelectric, 85 dB at 1 m
Working temperature
0°C … 40°C
Storage temperature
– 10°C … + 50°C
20% ... 80% RH (non-condensing)
Absorbed power
1.5 VA
Power supply
230V ±10 % 50 / 60Hz
Status check
Test button
Protection Class
91 x 91 x 35 mm
aprox. 250 gr.

Frequent questions

How can I tell if the detector is working properly?
After powering up, wait 15 seconds for the self-test process to complete. When this process is complete the red and orange LEDs will go out and the green LED will light solid. Press the Test button for 5 seconds to verify. The detector will acoustically and visually signal a possible danger and send a signal to close the solenoid valve.
Why is the yellow LED always on?
This indicator warns that the gas sensor is not working properly. Contact a Homplex representative to identify the cause and/or replace the methane gas detector. As long as the yellow LED is lit, the detector does not measure and does not respond if the dangerous level of methane gas in the room is exceeded!
I smell gas, but the detector doesn't react
The unpleasant and easily recognisable smell (an unpleasant sulphurous odour) of natural gas used in homes is due to odorant additives, such as tert-butylthiol, which are used for safety. Most people can detect this smell at fairly low levels of gas concentration (2% L.I.E. or less), but certain disabilities or advancing age can lead to a reduction in this smell sensitivity. The L.I.E. (Lower Explosive Limit) of the gas defines the minimum volume ratio of combustible gas or vapour in the air in which an explosive atmosphere will form. The detector is calibrated to trigger the alarm at the threshold of 10% of the L.I.E. of the detected gas. Thus, it is possible for a person to smell gas before the alarm is activated. This does not necessarily indicate a fault in the device. For humans, a gradual increase in gas concentration may also go unnoticed due to olfactory fatigue.
Wired methane gas detectors

Wired methane gas detector with 230V trigger – Homplex HD100

Product code: 3716001
Methane gas detector with wired solenoid triggering
  • Powerfull alarm
  • 10% L.I.E. alarm threshold
  • Quick release
  • NC or NO 230V?
  • Speed of activation