The SD-1 Gas detector head transmitter is an advanced device for hazardous area gas detection with a built-in display and signal converter. It measures gases with ppm and %LEL ranges. Certified with IECEx ATEX for flameproof enclosure,it allows easy calibrations and maintenance adjustments using a magnetic tool. Powered by 24VDC, it communicates through a 4-20mA signal and can be used with controllers like RM-6000 and RM-5000. The device features a self-diagnosis function, automatic zeroing, and the ability to connect alarm sounders and beacons via relay contacts.