DURÁN explosive gas detector for butane-methane-natural gas-hydrogen. rs485 ip65 but/prop/nat/h2 catalytic-pellistor technology, addressable 4-wire rs485 connection. parallel installation of up to 16 detectors on the same loop, detection range: 0 to 100% lel. plastic enclosure, optical indicators for loop and sensor fault. gas selection via jumper (rs485). resistant to silicone vapours (hdms).