Do both temperature variation and temperature safety barriers have automatic temperature compensation functions? Manual configuration is still required to set the compensation temperature
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Does anyone understand the concept of temperature transmitters and temperature safety barriers for temperature compensation?
Temperature sensors are generally installed at the site where work is carried out, where temperature fluctuations are significant. They usually do not have automatic temperature compensation; such compensation is typically provided by the display instrument. However, some temperature sensors do include temperature compensation, and this depends on the model specifications or your requirements when making the purchase.
We use Emerson’s and E?H’s
Any instrument that can be configured can be called an intelligent instrument. Since it is an intelligent instrument, is it still necessary to have a person perform even simple tasks such as cold-end temperature compensation?
I wonder how it achieves cold-end compensation
Temperature compensation is divided into two methods: internal compensation and external compensation, and some require selection during configuration. Internal compensation mostly uses PN junctions, while external compensation mostly uses copper thermoresistors. A forward voltage is taken from both ends of the PN junction and applied to the MCU, which then automatically compensates for the cold junction temperature of the thermocouple after performing calculations. The cold junction temperature is determined by sampling the Cu thermistor signal via the MCU; then, using a lookup table in software, the thermoelectric potential corresponding to that cold junction temperature is obtained. This value is added to the temperature measured by the MCU, and by referring to the table again, the actual temperature being measured can be determined.
The so-called compensation should refer to the cold end with stable temperature. Compensation is usually done in the control room.
For conventional instruments, a cold end with stable temperature is indeed required. However, for smart meters, cold-end temperature compensation can be performed on-site; it simply depends on the meter’s sampling period and the response time of the sensor used to measure the cold end temperature.
Timely is an intelligent meter; the cold-end temperature is relatively unstable, which makes things difficult.
Are the smart meters you mentioned equipped with transmitters? If they are just thermocouples and thermal resistors, then they wouldn’t be considered smart meters
Those that can be configured are generally considered smart instruments, while simple thermocouples and thermal resistors can only be referred to as temperature-sensing elements or temperature sensors.