Is it necessary for the locator to be equipped with a surge protector? Is such a low-voltage DC meter really required?

It’s usually not necessary to add it, but if it’s installed outdoors, it’s okay to add one as well – it makes things safer

Not all positioners require surge protectors to be installed. Is a surge protector necessary? Generally, surge protectors are required in tank areas and open spaces, as well as in locations where lightning strikes occur frequently. If configuration on the system side is required, surge protectors should be installed; surge protectors can also be used to protect the instruments and equipment on site. The above are my personal views for reference only.

Whether a surge protector should be installed on the locator depends on various factors, including the installation environment, the sensitivity of the system, and the types of electrical interference it may encounter. Even for low-voltage DC meters, surge protection may be necessary considering the following factors: 1. Environmental factors: If the transmitter is installed in an area with frequent lightning activity or in an industrial environment with high electrical noise, there is a significant risk of surges, which could damage the low-voltage DC meter. 2. Equipment value: If damage to the locator results in high repair costs, interruptions to critical processes, or data loss, it makes sense to install surge protectors for it, even if the protectors themselves are not expensive. 3. Sensitivity and reliability requirements: For certain precision control systems, even brief voltage spikes can cause equipment failure or a decline in performance. In this case, using surge protectors can ensure the stability and reliability of the system. 4. Existing protection measures: If the system already has comprehensive overvoltage protection measures, it may not be necessary to equip surge protectors for each individual instrument. However, if such protection is lacking in the system, it may be necessary to add separate protection for sensitive devices. In general, although low-voltage DC instruments may not be as susceptible to surge damage as high-voltage equipment, given that preventive measures are usually inexpensive while the potential losses can be significant, it is a prudent choice to install surge protectors on regulators in situations where there is a clear risk. It is recommended that you consult a professional based on the specific application scenario and device requirements to determine whether it is necessary to install surge protectors for the locator. .

In accordance with the requirements of SH/T3164-2021, surge protectors SPD should be installed on the following field instruments in above-ground tank farms: 1. Electrical and electronic measuring instruments that convert signals into electrical signals, such as transmitters. 2. Gas detectors, analyzers. 3. Electric and electrical signal actuators such as electrical converters, electrical valve positioners, solenoid valves, and electric actuators. 4. Thermal resistor. 5. Electronic switch. 6. Relay coil. 7. Network and communication devices fixed in place. 8. Other instruments that are sensitive to lightning surges or cannot withstand them. Whether a surge protector is needed depends mainly on whether the device in which the electrical equipment is installed falls within a lightning protection area; you can refer to the industry standards mentioned above, which provide a comprehensive overview

Field instruments that require or do not require surge protectors (SPD) https://bbs.hcbbs.com/thread-5496375-1-1.html (Source: Haichuan Chemical Industry Forum)