Regarding the input and output signals of the digital display instrument
Thread Content
Friends, I have a thermal resistor, and the signal from this resistor goes into a digital display. What kind of digital display is needed in order to convert the resistor signal into a 4-20mA output? First, the resistor signal enters the digital display, which can show the temperature. Since there are analog input points in the control room where connections can be made, I plan to use the digital display to generate a 4-20mA signal that can be sent to the control room. As the resistor signal is non-linear over a wide range of temperatures, the indication on the digital display is also non-linear; therefore, the 4-20mA signal generated as a result is also non-linear. It’s all quite confusing right now... I hope someone experienced can give me some advice.:dizzy::dizzy::dizzy::dizzy::dizzy::dizzy:
Regarding this issue, check the specifications in the selection manual for the digital display, or find a user manual – that will solve the problem.
Commonly used in factories; the better-quality domestic brands are Changhui and Hongrun. If you need the model number, I can send it to you via private message. However, it is usually installed on panels – do you have the necessary conditions on site?
Many digital displays with quadratic functions have a synchronous output feature, which allows for the synchronous input of this PV value, in the standard 4–20 MA format. If such a feature is not available, it is recommended that you use a signal distributor
You just said what I wanted to say – is this panel suitable? Our factory generally uses panels for equipment; it is best to pair them with temperature transmitters when used in the field, and there are also some domestic solutions available.
Is there an explanation for this table? Is it expensive?
Digital displays generally accept inputs from resistors or thermocouples; the display panel shows the temperature, and the device provides a temperature-dependent output signal of 4–20 MA