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The General Monitors Model S4100T Hydrogen Sulphide Addressable Transmitter is a highly reliable, self contained, microprocessor- controlled single point monitor with integral 3 digit readout. It is designed to measure and display concentrations of H2S in three ranges: 0-20ppm, 0-50ppm or 0-100ppm, but will continue to display concentrations up to 120% FSD. The sensing element may be incorporated in the transmitter housing or remotely mounted at distances in excess of 600m. The S4100T will record the number of successful calibrations and compute the sensor resistance in Kohms during calibration and store sensor condition data in a non-volatile memory, together with calibration and set-up parameters. The S4100T's user interface is menu driven. In addition the instrument may be addressed via the Dual MODBUS RTU interface which is based on the RS-485 standard. The MODBUS output provides status, alarm, fault and other information for operation, trouble-shooting or configuration of the unit. A1 and A2 Alarm Trip levels are user selectable in 1ppm increments from 1-19ppm for 0-20ppm, 5-45ppm for 0-50ppm or 10-95ppm for 0- 100ppm measuring range. Calibration level is 50% of selected measuring range.