Building technology Gas alarm units for the private home Additional gas sensor to be used with the gas alarm unit GS 2.1. Enables monitoring at two points in different rooms. For the detection of dangerous CO gas concentrations in residential buildings. GS 3.1 is installed close to the heating or hot water boiler. Remote sensor for gas alarm unit GS 2.1. LEDs for operation (green), alarm (red), error (yellow) are located at the front side of the housing. Audible alarm is triggered by the gas alarm GS 2.1. 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. 300 ppm CO are reached. The audible alarm can be muted with the Reset button. The visual alarm remains active until the alarm condition no longer exists (reset). Standard setting is CO. Technical specifications Housing W x H x D 80 x 80 x 36 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 Service life: Approx. 5 years Audible alarm: Internal buzzer, min. 50 dB(A) Service life: Approx. 5 years i GS gas alarm units are cross-sensitive to hydrocarbons, lacquers, solvents, alcohols and similar media.