October 2004Analytical Instrumentation & Environmental Monitoring
Instrotech is offering Rense relative humidity and temperature transmitters with user-selectable signals and ranges. Series 741 is a 2-wire transmitter providing a 4 to 20 mA output using the same wires for supply and output. The Series 740 is a ¾-wire unit and provides user-selectable output signals such as 0 to 1 V, 0 to 5 V, 0 to 10 V, 0 to 20 mA or 4 to 20 mA.
The relative humidity transmitter continually measures the ambient humidity and gives a linear output signal directly proportionate to the RH. Scaled range is 0-100% RH with accuracies of ±2%. Calibration bottles containing a saturated salt solution come in 11%, 33%, 55%, 75% or 90% RH. A range-selectable integrated temperature transmitter is available as option, which requires no re-calibration. High temperature models up to 150°C can be supplied.
The thin film polymer capacitor sensor is immune to most reagent vapours. Included on the sensor head is a protection cap with Teflon filter for use in dusty environments. A sintered stainless steel dust filter is also available. The transmitter mounting options are available for wall, duct and remote mounting with optional mounting flanges on a ¾" NPT adjustable stainless steel fitting.
Instrotech manufactures digital indicators to operate with the Rense transmitters with a full range of options that can provide a dual loop supply and input for indication of RH and temperature.
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