Non-contact temperature sensor is loop-powered

Paul Boughton
Micro-Epsilon is expanding its range of non-contact infrared temperature sensors to include a new programmable, two-wire, loop-powered version. The thermoMETER CSmicro 2W sensor is a 4-20mA loop-powered device that measures temperatures from -30 up to 1600 degrees C. The processing electronics are integrated in the cable itself, making the sensor head very compact. Micro-Epsilon says that other sensors of a similar size currently available on the market do not have in-built processing/conditioning electronics to linearise the sensor output. This means users have to linearise the output, which can be complex and time-consuming.
With rugged silicon-coated optics (15:1 or 75:1), the thermoMETER CSmicro 2W offers a system accuracy of +/-1.0 per cent and +/-0.3 per cent of the reading, respectively. The sensor can be used in ambient temperatures of up to 130 degrees C without having to cool the sensor head.
Two-wire, loop-powered sensors extract the power they need to operate their electrical circuits from the loop itself. There is no separate power feed from the analogue input card or from anywhere else. The current that the devices draw becomes part of the 4-20mA that flows in the loop, so the devices do not require more than 4mA to operate. This means the number of wires and connections are reduced. Two-wire, loop-powered sensors are predominantly used by the process manufacturing industry, including oil and gas, petrochemicals, chemicals and power generation companies.
With the thermoMETER CS micro 2W, an optional USB connection and Micro-Epsilon's Compactconnect software enable users to set up and configure the sensor or change the emissivity to suit the target material. The software includes analysis functions such as a graphical display that shows temperature trends and enables automatic data logging for analysis and documentation.
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