Temperature Measurement


Intrinsically safe thermometer

July 2003 Temperature Measurement

The Hart Scientific 5577 handheld, intrinsically safe RTD thermometer system, from Spescom MeasureGraph, is suitable for operating in specified hazardous environments. Despite its light weight and portability, it is a two-channel, high-performance instrument that provides high-accuracy measurements across an important temperature range.

Its safety rating makes the 5577 a critical instrument for petrochemical refineries that have previously mainly relied on expensive and delicate liquid-in-glass thermometers for temperature reading. It is also a valuable device for natural gas firms, which in custody transfer applications must make precise temperature measurements to ensure volume accuracy.

The device provides basic accuracy of ±0,05°C over its full range of -100°C to 135°C. A drift specification of ±0,05°C allows for one-year drift of the probe under normal usage and handling conditions. Each new 5577 system (meter and probe) is 'system calibrated' at Hart, providing a NIST-traceable NVLAP-accredited system calibration.

Each of the two probes must receive its own system calibration with its intended meter on its own specific channel, requiring it thereafter to be dedicated to its channel in order to gain the full intended advantage of the 5577's accuracy specifications. Users of this thermometer include petrochemical locations, oil refineries, chemical plants, pharmaceutical facilities, gas pipelines, and many others.

For more information contact Van Zyl Koegelenberg, Spescom MeasureGraph, 011 266 1572, vanzylk@spescom.com





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