From the thermal resistor to the on-site temperature sensor, does the cable shielding layer in between need to be grounded?

Generally, branch cables are armored, while the main cable may not require armor. If there is no armor, I personally think this shielding layer can be grounded to protect against high voltage; this is for reference only.

In industrial applications, the shielding layer of shielded cables is typically used to reduce electrical noise interference and improve the quality of signal transmission. According to general engineering practices and standards, the shielding layer of shielded cables must be grounded, but the grounding method must be correct in order to avoid introducing new interference issues such as ground loops. For the shielded cable running from the thermal resistor to the field temperature transmitter, the commonly recommended grounding method is as follows: 1. Single-point grounding: The shield layer is grounded at only one end, usually at the signal source end or the receiving end, rather than at both ends simultaneously, which helps to avoid ground loop interference. 2. Ground point selection: If grounding is to be done at the signal source side (at one end of the thermoresistor), it is necessary to ensure that this ground point is a good one; it is usually connected to the grounding terminal or grounding bus of the control cabinet. If grounding at the receiver side (the transmitter end) is chosen, it should be connected to the transmitter’s ground point. 3. Maintain shield integrity: During the process of stripping and connecting the cables at both ends, it is essential to ensure the integrity of the shielding layer, preventing it from breaking or from not being properly grounded. It is very important to ensure that shielded cables are properly grounded, as an incorrect grounding method may not only fail to provide adequate shielding but can also cause new interference. Furthermore, if the owner has specific regulations and requirements, the technical specifications or standards designated by the owner should also be followed during grounding operations. Before proceeding with the actual work, it is advisable to consult the property owner or on-site engineer for specific grounding instructions. .

Since shielded cable is being used, it’s best to ground it.

From the field thermoresistor to the site temperature sensor, a single-core cable should be used for this section; there is generally no interference, so it isn’t necessary to ground the shielding layer； The instrument enclosure can be given a protective ground connection.

Separate thermal resistor → shielded cable → separate temperature transmitter on-site. Where should the temperature transmitter be installed? Looking for a system architecture diagram?

There are split-type temperature transmitters on site, mounted on columns; there are also temperature transmitters in junction boxes, mounted on rails.

This post was last edited by cqdfwy on 2023-11-24 10:40. What is the relationship between thermal resistors and temperature changes? Are there any possible sources of interference in the area near where its connection cable passes? If interference is possible, it is advisable to ground it; otherwise, it can remain ungrounded. Of course, if the thermal resistor or (and) temperature sensor is located in a hazardous area, additional considerations are required.