Building technology Gas alarm units for the private home Relay for external s e n so r For the detection of inflammable gases such as methane, propane, butane in ambient air in residential buildings. For the detection of inflammable gases such as methane, propane, butane in ambient air in residential buildings. Gas alarm unit with integrated semiconductor sensor and alarm buzzer. LEDs for operation (green), alarm (red), error (yellow), the Test button and the Reset button are located at the front side of the housing. The alarm is triggered when approx. 20 % of the LEL (lower explosive limit) is reached. The audible alarm can be muted with the Reset button. The visual alarm remains active until the alarm condition no longer exists (reset). Gas alarm unit with integrated semiconductor sensor, alarm buzzer and relay output for connection of additional external alarm equipment (e.g. horn). LEDs for operation (green), alarm (red), error (yellow), the Test button and the Reset button are located at the front side of the housing. The alarm is triggered when approx. 20 % of the LEL (lower explosive limit) is reached. The audible alarm can be muted with the Reset button. The visual alarm remains active until the alarm condition no longer exists (reset). The unit features an additional input for connection of an external gas sensor GS 4.1 as a second measuring point for monitoring different rooms. Technical specifications Housing W x H x D 158 x 90 x 44 mm Degree of protection: IP 20 (EN 60529) Housing W x H x D 158 x 90 x 44 mm Degree of protection: IP 20 (EN 60529) Operating temperature range Ambient: 0/50 °C; max. 75 % rH Operating temperature range Ambient: 0/50 °C; max. 75 % rH Alarm value: Approx. 20 % LEL Alarm value: Approx. 20 % LEL Audible alarm: Internal buzzer, min. 50 dB(A) Audible alarm: Internal buzzer, min. 50 dB(A) Service life: Approx. 5 years Service life: Approx. 5 years i GS gas alarm units are cross-sensitive to hydrocarbons, lacquers, solvents, alcohols and similar media. Gas alarm unit GS 1.1 Methane Gas alarm unit GS 1.1 Propane/Butane Gas alarm unit GS 2.1 Methane Gas alarm unit GS 2.1 Propane/Butane