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The General Monitors Model S4100C hydrocarbon gas Addressable Transmitter is a highly reliable, self-contained, microprocessor-controlled monitor with integral 3 digit readout. It is designed to measure and display concentrations of combustible gases in the range 0-100% LEL, but will continue to display concentrations up to 120% LEL. The sensing element may be incorporated in the transmitter housing or remotely mounted at distances in excess of 600m. The S4100C will record the number of successful calibrations, compute the sensor output as a percentage of the new sensor reference output during calibration and store in non-volatile memory, along with calibration and set-up parameters. The S4100C'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, troubleshooting or configuration of the unit. Calibration level, A1 and A2 Alarm Trip levels are user selectable. Calibration from 25% to 90% LEL in 1% LEL increments and A1 and A2 Alarms from 10% to 60% in 1% increments. Calibration may be completed in less than 2 minutes. All parameters are tested by advanced software routines before being accepted.