Thermocal Laboratory is accredited to calibrate temperature measuring and monitoring systems associated with large freezers, 
chillers and food processing areas. A typical system would comprise a number of fixed temperature sensors located in different 
areas. The sensors would be connected to a centralized temperature measuring device that could be a multi channel chart 
recorder or computer based data logging system.

The laboratory has two calibrated reference temperature sensors that are used for on site temperature calibrations. Each sensor 
must be located in the same position as the sensor/s being calibrated. The reference sensors are used in conjunction with two 
digital temperature meters located inside a portable temperature controlled enclosure. The enclosure provides a stable ambient 
environment for the meters.  The reference system is calibrated at regular intervals and the associated uncertainty has been 
determined to be less than ± 0.2° C.

Calibrations are carried out only at the operating temperature of the areas where the fixed sensors are located. This 
should ideally be the normal operating temperature. It is preferable that there is minimal disturbance to air temperature 
while the calibrations are being carried out.

If sensors are difficult to access due to height or product storage, then some assistance might be required in positioning the reference 
sensors. For large areas or systems, some assistance will usually be required to locate the sensors. Some supervision may be 
required, to ensure the safety of the person working at heights, or in cold conditions.

A summary of the on site measurements is recorded in a Certificate of Calibration endorsed by International Accreditation New Zealand 
(IANZ, formerly Telarc). The certificate contains information on any corrections to be applied to readings of the temperature monitoring 
system, and a determination of the accuracy of the system.

The reference thermometers used by the laboratory have calibrations that are traceable to the Australian national standards of 
temperature measurement, which are recognised internationally. The calibration carried out by the laboratory will ensure that 
temperature measurements made by the client’s temperature measuring system are traceable to national standards.

Because of the increasing workload carried out by the laboratory, on site labour required for the calibration of temperature monitoring 
systems is subcontracted to Imtest Laboratory Ltd.

Imtest Laboratory is a well established laboratory that is proficient in a wide range of testing and measurements. The laboratory is 
IANZ accredited for some tests, and in addition, is assessed by Standards Australia for some of the work carried out. Staff at Imtest 
Laboratory have a good understanding of the requirements necessary for maintaining quality assurance.

Imtest Laboratory will carry out the on site measurements using instruments and equipment belonging to Thermocal Laboratory, following 
procedures established by this laboratory. Thermocal Laboratory will be responsible for processing the measurements and issuing an 
IANZ endorsed Report.

We are confident that the high standard of work that has been achieved in the past will continue to be maintained.

If you have digital or liquid in glass thermometer that requires calibration, Imtest Laboratory can arrange for the instrument/s to be 
calibrated by Thermocal Laboratory.