A digital display controller is a simple controller with indication, control, remote transmission and alarm functions. As a secondary instrument commonly used in sensors, it is very important to operate and use it correctly. Applications such as level control, temperature control, pressure control and parameter value display of measured variables.
Sensors commonly used in digital display controllers.
Temperature sensors include thermocouples and RTDs, transmitters include pressure transmitters, differential pressure transmitters, liquid level transmitters, and flowmeters include electromagnetic flowmeters, vortex flowmeters, etc.
The digital display controller can receive the signal.
Resistance signal, electrically coupled signal, standard electrical signal 1-5VDC or 4-20ADC, non-standard electrical signal 0-10ADC0-20ADC or 0-5VDC 0-10VDC.
The parameter settings of the controller are displayed digitally.
The parameter settings of the digital display controller include primary parameter setting and secondary parameter setting. The alarm function is usually set in the main parameter settings. The secondary parameter setting is important, and the choice of graduation number is important. There are eight thermocouple graduation numbers (BSRKTNJE), and two RTDs (Cu50PT100) are usually used, so it is necessary to memorize their graduation numbers. The indexing number of the commonly used sensor electrical signal has a standard current signal 4-20mAADC standard voltage signal 1-5VDC, the upper and lower limits of the range are set and the upper and lower limits of the output range of the transmitter are set, in which the small signal cutting can only be used in the flow transmitter, other transmitters can not be used, and other function settings can be selected according to the need. Generally, the common parameters can be set to meet the requirements.
The parameters of the digital display controller are set by input signal selection, which is generally set to ** item in the secondary parameters, and the decimal point is generally set to the secondary term. Parameters such as the upper and lower limits of the measurement range, the transmitter output signal setting, the alarm type, etc. There are different options due to the different models of digital display control instruments.
For the wiring of the digital display control instrument, due to the different types of the digital display control instrument, the terminal block is also different, which is usually displayed on the back of the instrument and can be followed by the wiring diagram.
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· Wiring warning:
- If the instrument fails or an error occurs, which can cause a system failure, install external protection circuits to prevent such accidents;
- To prevent damage or failure of the instrument, use appropriate fuses to protect the power cord and input/output cord from strong power shocks.
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RKC thermostat wiring needs to pay attention to
Wiring Notes:
1. For thermocouple input, the corresponding compensation wire should be used.
2. RTD input, 3 wires with low resistance and no difference should be used.
3. The input signal line should be far away from the power line of the instrument. Power supply and load lines to avoid noise interference.
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