Humidity Transmitter NIST Traceable Certificate of Calibration – Application Note


BAPI’s standard product accuracy is either ±3.0% or ±2.0% relative humidity.  BAPI can provide an NIST Traceable Certificate of Calibration for each humidity transmitter that corrects each sensor and transmitter assembly to ±1% relative humidity as shown in the figure below.  Each certified sensor/transmitter pair will ship with a unique certification.  BAPI retains certification data for future reference.

Each sensor is placed into a precision humidity chamber that can hold a relative humidity condition to within ±0.5%RH.  An independent instrument, with an annual NIST calibration accurate to ±0.5%RH, samples the inside of the chamber to verify the humidity reading.  The humidity transmitter’s output is recorded at each humidity certification point.  BAPI normally tests at 25%, 50% and 75% relative humidity at one customer specified temperature.  BAPI will test at any relative humidity and temperature that you specify.  BAPI’s humidity chamber has temperature test limits of 0 to 70°C and humidity test limits of 15%RH to 95%RH.

If you require the humidity reading to be certified at more than one temperature, please contact your BAPI representative for pricing.  Please allow additional lead time when ordering certified units. If you have any questions about the certification documents, please contact your BAPI representative.

If you have any questions about the certification documents, please contact your BAPI representative.


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