Gas measurement & warning device without certified measuring function for explosion protection. This variant of the OLLI is NOT on the BG RCI list of function-tested gas detectors (see article 280010). Explosion-proof & compact handheld gas measurement instrument as diffusion device. It can be used for up to 5 combustible and toxic gases as well as oxygen and comes in an extremely rugged 2C synthetic housing with 3 alkaline manganese primary cells. Up to 3 gas sensors can be installed (Ex/Ox/Tox). Assembly is based on customer requirements. The device can be optionally equipped with a Li-ion battery pack, pump and pressure sensor. Operating time > 50 hours (depending on type & number of installed sensors and ambient conditions, w/o illumination) Measurement ranges are subject to sensor assembly Dimensions: 136 x 78 x 43 mm Weight: approx. 350 g Explosion-proof measurement instrument, marking: II 2G Ex ib db IIB T4 Gb BVS 17 ATEX E 043 X Temperature range: -20°C <= Ta <= +50°C