1. Choice
(1) You need choose the corresponding thermocouple compensation wire according to the type of thermocouple. Different wire materials have different temperature limits and errors, it is very important to choose wires with sufficient high or low temperature capabilities to meet applications.
(2) You need choose suitable materials and protection jackets for the thermocouple wire considering the temperature, humidity, corrosive gas and other factors in the working environment.
(3) You can choose shielded wire to reduce interference if the measurement is working environment with strong electromagnetic interference
2. Installation
(1) The twoends of thermocouple compensation wire should beas close as possible,you needtry to keep the temperature of the twoendsand the connections with other two instrument wiring endsare the same. Also, if the instrumentation cabinet with a fan, we should avoid fan blowing directly on the connection point.
(2) Because the signal generated by the thermocouple is very weak for the microvolt level. If distancefor usingis too long, the signal transmission attenuation and environmental interference in the strong electric couplingare enough to make the thermocouple signal distortion, causingthe inaccuracy measurement and control the temperature fluctuations. According to experience, the length of thermocouple compensation wire should be controlled below 15m, if it exceeds 15m, it is recommended to use temperature transmitter for signal transmission. Temperature transmitter convert the potential value corresponding to the temperature into DC current transmission,withstrong anti-interference.
(3) Compensation wire wiring must befaraway from the power line and interference sources in order to avoid having to cross, but also as far as possible to use the cross interchangeable way, please do not use parallel laying.
(4) The positive and negative poles of the compensation wire must be opposite to the positive and negative poles of the thermocouple. Otherwise it will not only fail to compensate for the role, which will also cause larger resulting error, sowe must pay attention to the polarity of the connection.
(5) In the precision measurement, when we usecompensation wire, the measurement results must be added to the correction value of the compensation wire.
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