The GS-133 detects all mixtures of air and combustible gas (Natural Gas, Methane, Propane, Butane, Acetylene, GPL etc). The detector detects two levels of gas concentration. The characteristics of the detector are excellent stability, high sensitivity, long life, small size and being mains-powered. Indicates a gas leak optically and acoustically. It is also equipped with optional relay output functions.

SENSITIVITY (concentration):
- Methane: Level 1: 10 ± 3% LEL (0.50% vol) | Level 2: 18 ± 3% LEL (0.80% vol)
- Propane : Level 1: 18 ± 3% LEL (0.30% vol. conc.) | Level 2: 30 ± 3% LEL (0.50% vol)
- Iso-butane: Level 1: 23 ± 3% LEL (0.30% vol) | Level 2: 40 ± 3% LEL (0.80% vol)

LEL = Lower explosive limit (100%) according to IEC 60079-20-1: for Methane is 4.4% volume concentration for propane 1.7% vol, for iso-butane 1.3% volume, calibrated in the production of iso-butane

SPECIFICATIONS
- Power supply: DC 12V ± 20%
- Current consumption: standby 100 mA ; closed relay 150 mA
- Beep: 94 db / 0.3 m
- Relay Output: 250 V / 5 A (selectable response to the 1st or 2nd level)
- Capacity of relay: contacts max. 230 V / 5 A
- Operational temperature: -10 °C to +40 °C
- Relative humidity: 25 to 75%
- Storage temperature: -20 °C to +50 °C
- Stabilization time 90 s
- Response time: max. 20 s
- Detection method: catalytic combustion
- Housing: IP 30 (EN 60 529)
- Equipment lifespan: min. 5 years
- Designed to operate at normal atmospheric pressures 86 to 106 kPa
- Meets EN 50194-1, IEC 60079-29-1, IEC 50130-4, EN 55022
- Note: not suitable for hydrogen