Recently, there’s been some confusion when it comes to calibration and EL series temperature data loggers. The fact that we offer a NIST traceable calibration certificate (sold separately) has led some to believe that a certificate must be purchased in order for the logger to be calibrated. On the contrary, EL series data loggers are calibrated prior to shipment and values are warranted to be within the specifications outlined in their respective datasheets. A certificate is not provided with the unit, however.
Do I Need a NIST Traceable Calibration Certificate?
If you haven’t been told that your measurements need to be NIST traceable, you probably don’t need a certificate. The certificate simply establishes traceability to NIST standards. If you’re unsure, consult with the company/organization that you’re making measurements for.
How Many Data Points?
Assuming that NIST traceability is required, multiple data points can be chosen . Calibration will be performed at each of the chosen data point. The number of temperature points chosen depends on the application. For example, if you’re acquiring temperature values over a narrow range; say 75 to 80°F, you might choose a single calibration point of 77°F (a standard calibration point). On the other hand, if you’re acquiring data over a wide range; say 32°F to 100°F, you might choose to calibrate the unit at several points in between.
A Note Regarding Thermocouple-based instruments
Calibration certificates ordered for instruments that use thermocouples (TCs) apply only to the instrument itself, and exclude the supplied TC. The TC provided with all TC-based EL Series instruments is not a NIST-traceable sensor, so it doesn’t make sense to include it with the certification. Many reputable suppliers of TCs supply them with a NIST-traceable option. Using such a sensor with an instrument purchased with the certification option forms a complete, certified solution.