Sensor Calibration Information

Temperature Sensor Calibration and Validation

Temperature monitoring sensors typically do not require recalibration. The Dragino LHT65S sensor uses the SHT31 chipset, which is digitally calibrated by the chipset manufacturer.

Each device is individually tested after calibration using transfer standards, which themselves undergo a scheduled calibration process. These standards are calibrated using references maintained by ISO/IEC 17025-accredited laboratories.

The accreditation body is a full member of the International Laboratory Accreditation Cooperation (ILAC). Calibration certificates issued by ILAC MRA signatories are recognized and accepted globally by all other signatories.

This ensures full traceability of measurements back to national standards bodies, such as:

National Physical Laboratory (NPL)
Physikalisch-Technische Bundesanstalt (PTB)
National Institute of Standards and Technology (NIST)

If you believe you have a faulty sensor, please contact support where we can replace the sensor under warranty.

Validating Sensor Accuracy

If a customer wishes to validate their sensor’s accuracy, they can either:

Conduct an ice bath calibration test (see instructions below), or
Send the sensor to a certified third-party calibration facility for professional testing and certification.

Ice Bath Test Instructions

Fill a container with ice to the top.
Slowly add cold water until it just covers the ice (creating an ice-water slurry).
Place the temperature sensor into a ziplock bag (make sure it's water-proofed and sealed) and remove as much air as possible before sealing.
Allow the ice slurry to stabilize for 3–5 minutes.
Submerge the sealed bag into the slurry (use a weight if necessary to keep it submerged).
Leave it for approximately 3 minutes.
Trigger a manual temp reading by holding the power button (check your sensor’s manual for the correct method).
Repeat this test three times and compare the recorded temperatures - they should be close to 0°C.