This product is obsolete and has been replaced by the S5000.

The General Monitors Model S4100T Hydrogen Sulphide Addressable Transmitter is a highly reliable, self-contained, microprocessor-controlled single-point monitor with an integral three-digit readout. It is designed to measure and display concentrations of H2S in three ranges: 0 – 20 ppm, 0 – 50 ppm or 0 – 100 ppm, but will continue to display concentrations up to 120 % FSD.

The sensing element may be incorporated into the transmitter housing or remotely mounted at distances exceeding 600 m.

The sensor utilises thin-film metal oxide semiconductor (TFMOS) technology as its measuring principle.

The S4100T records the number of successful calibrations, computes sensor resistance in Kohms during calibration and stores sensor condition data in non-volatile memory, together with calibration and setup parameters.

The S4100T’s user interface is menu-driven. Additionally, the instrument can be accessed via its dual Modbus RTU interface, which is based on the RS-485 standard.

Modbus output provides status, alarm, fault, and other information for operation, trouble-shooting or unit configuration.

A1 and A2 Alarm Trip levels are user-selectable in 1 ppm increments, ranging from 1 to 19 ppm for 0 to 20 ppm, 5 to 45 ppm for 0 to 50 ppm, or 10 to 95 ppm for 0 to 100 ppm measuring ranges.

The calibration level is 50% of the selected measuring range.

Features

• RS-485 dual Modbus serial interface, in addition to 4–20 mA, provides measurement, setup, and status of up to 247 nodes.
• 18.5 – 35V DC operation allows for longer cable runs and lower-cost installation.
• Fully adjustable and configurable open-collector outputs result in lower wiring costs and flexible operation.

Applications

• Refineries
• Drilling platforms and rigs
• Gas and oil production platforms
• Mud logging operations
• Desulphurisation facilities
• Heavy water nuclear facilities
• Wastewater treatment plants
• Chemical plants
• Wellhead sites
• Oil recovery/reinjection sites