Factors in Selecting a Temperature Transmitter
Date：2016-1-22
Installation
Start with the environment in which you will install the transmitter. If you have a short distance between the sensor measurement and your control room (and this distance is free of plant electrical interference), then you can install a temperature transmitter in the control room. If you have a long distance between the sensor and the control room (or if plant noise will adversely affect the sensor’s signal), then you should install the instrument as close to the sensor as possible.
Configuration
You can configure available universal temperature transmitters using on-board controls, hand-held configurators, and/or with PC software.
Accuracy
These instruments differ greatly in measurement accuracy, ranging from those that provide accuracies of ±1°F to those that deliver accuracies of ±0.025°F.
Sensors
The best sensor is typically a resistance temperature detector (RTD) or a thermocouple. RTDs include a length of fine coiled wire wrapped around a sheathed probe to protect it. The material has a predictable change in resistance as the temperature changes, which allows the sensor to determine a precise temperature measurement. In general, an RTD will give you a more accurate, stable temperature measurement than a thermocouple, if the more fragile RTD can withstand the environment.
RFI/EMI Protection
Always stipulate a transmitter with a stated Radio Frequency Interference (RFI)/ Electromagnetic Interference (EMI) immunity specification. RFI and EMI can diminish transmitter performance and accuracy, and can even cause complete instrument malfunction.
Diagnostic Capabilities
Analog transmitters can provide basic diagnostics, while digital ones can continually monitor the sensor and point you to a broken wire.
Certifications
If you are installing a temperature transmitter in a hazardous area, you need to make sure that you specify an instrument approved for use in that classified area. Look for the coding system that identifies the instrument’s hazardous area rating (e.g., Class I, Division I, Groups A, B, C, D).
Customization
Because you must take many details into consideration when selecting temperature monitoring instrumentation, Some technical advisors can help you identify and produce the appropriate instrument for your specific application requirements.
Start with the environment in which you will install the transmitter. If you have a short distance between the sensor measurement and your control room (and this distance is free of plant electrical interference), then you can install a temperature transmitter in the control room. If you have a long distance between the sensor and the control room (or if plant noise will adversely affect the sensor’s signal), then you should install the instrument as close to the sensor as possible.
Configuration
You can configure available universal temperature transmitters using on-board controls, hand-held configurators, and/or with PC software.
Accuracy
These instruments differ greatly in measurement accuracy, ranging from those that provide accuracies of ±1°F to those that deliver accuracies of ±0.025°F.
Sensors
The best sensor is typically a resistance temperature detector (RTD) or a thermocouple. RTDs include a length of fine coiled wire wrapped around a sheathed probe to protect it. The material has a predictable change in resistance as the temperature changes, which allows the sensor to determine a precise temperature measurement. In general, an RTD will give you a more accurate, stable temperature measurement than a thermocouple, if the more fragile RTD can withstand the environment.
RFI/EMI Protection
Always stipulate a transmitter with a stated Radio Frequency Interference (RFI)/ Electromagnetic Interference (EMI) immunity specification. RFI and EMI can diminish transmitter performance and accuracy, and can even cause complete instrument malfunction.
Diagnostic Capabilities
Analog transmitters can provide basic diagnostics, while digital ones can continually monitor the sensor and point you to a broken wire.
Certifications
If you are installing a temperature transmitter in a hazardous area, you need to make sure that you specify an instrument approved for use in that classified area. Look for the coding system that identifies the instrument’s hazardous area rating (e.g., Class I, Division I, Groups A, B, C, D).
Customization
Because you must take many details into consideration when selecting temperature monitoring instrumentation, Some technical advisors can help you identify and produce the appropriate instrument for your specific application requirements.
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