SIR #: 378
Section: V1M2, Section 220.127.116.11
d) Temperature measuring devices shall be calibrated or verified at least annually. Calibration or verification shall be performed using a recognized National Metrology Institute traceable reference, such as NIST, when available.
Question: do reference thermometers need to be calibrated annually? These are traceable to NIST.
TNI FINAL RESPONSE:
As long as the reference thermometer is not being used as a piece of support equipment such as described in 18.104.22.168 c, a reference thermometer is a reference standard as described in 22.214.171.124 and would need to be calibrated before and after any adjustment, and in accordance with the lab’s documented procedure.