With twisted shielded pair thermocouple extension wire, an Exergen IRt/c can be mounted as far as 300 metres from the readout device, even in harsh electrically noisy environments. The extraordinary noise suppression characteristics designed into the unit make this possible, without using a transmitter. The housing is electrically isolated from the signal leads and is connected to the shielded ground of the extension cable. For long distances, the twisted shielded extension cable should be used, and the shield connected to a good electrical ground.
A demonstration test was performed with a 300 m coil of twisted shielded pair of extension wire, with 30 m unwound, connecting an Exergen IRt/c to a fast (100 msec response) A/D conversion module and a computer. As a noise generator, a 60 Hz 10 000 volt transformer and spark generator was set up to spark within 6 inches (15 cm) of the wire. The test results showed less than 0,1°C of noise error for any relative positioning of the wire, spark and transformer.
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