Temperature Sensing Instruments: Choose and Verify the Measurement — working record
Yenra | October 3, 2026
https://yenra.com/temperature-sensing-instruments/

Purpose: Compare contact and infrared approaches for a defined process and prepare an installed-measurement verification plan.

Instructions: Make a working copy. Fill the fields below with actual evidence and units. Record unavailable information as unknown, give it an owner, and resolve it before using the record for acceptance. Keep raw evidence by reference. Use the approved method, equipment limits and acceptance rules for your application. This blank record does not establish qualification.

1. Process decision and owner
   Response / evidence reference: ______________________________

2. Target quantity/location; sketch or photo reference
   Response / evidence reference: ______________________________

3. Expected and abnormal range (°C); required response time (s)
   Response / evidence reference: ______________________________

4. Sensor model/type/serial; construction; mounting and immersion
   Response / evidence reference: ______________________________

5. Readout/transmitter identity; wiring and conversion settings
   Response / evidence reference: ______________________________

6. Reference ID; calibration date; uncertainty and units
   Response / evidence reference: ______________________________

7. Comparison: reference °C / indicated °C / difference °C / time / stable conditions
   Response / evidence reference: ______________________________

8. As-found result; changes; as-left result; acceptance rule and uncertainty treatment
   Response / evidence reference: ______________________________

9. Installed response and fault indication checks
   Response / evidence reference: ______________________________

10. Approval, unresolved issues and review trigger
   Response / evidence reference: ______________________________

Teaching example (fictional; not acceptance criteria):
Fictional comparison at a stable condition A reference reads 100.0 °C while the installed channel reads 102.0 °C, a difference of +2.0 °C. At a second stable condition the readings are 150.0 °C and 154.0 °C, a difference of +4.0 °C. Subtracting 2.0 °C from every reading would leave a +2.0 °C difference at the second point. This two-point example suggests investigating scaling, sensor conversion and the comparison setup before approving a single offset. The numbers are teaching inputs, not acceptance limits.

Primary source context (consult for applicable method and scope):
NI's temperature-sensor comparison
https://www.ni.com/en-us/innovations/white-papers/06/overview-of-temperature-sensors.html
Fluke's guide to temperature-sensor errors
https://www.fluke.com/en-gb/learn/blog/temperature-calibration/best-practices-process-temperature-calibration

Review outcome: accepted / held / further evidence needed
Reviewer and date: __________________
Open actions, owner and due date: __________________