ANALYTICAL AND LABORATORY EQUIPMENT 23
A practical, cost-effective alternative method is to use an in-house, portable temperature calibration system from Labfacility. Tis provides a rapid and simple method of sensor checking and traceable calibration ‘on the bench’.
It comprises a thermal reference (dry block) calibrator, a UKAS- certified reference thermometer (Pt100), a calibrated L200 8 channel indicator/logger and PC software. Tis, when used with any Windows PC, represents a complete solution for on-site accreditation that allows direct comparison of the steriliser probes with the reference sensor. A simple calculation of difference in temperature (if any) between the logged values indicated by the reference and each test probe at a given, stable temperature (chosen by the user) in the dry block calibrator gives the error value for each sensor at particular temperatures. Te procedure can be repeated for alternative
temperatures set on the dry block as required.
Te system can even be used independently of a PC if desired; rather than working with logged data, readings for each probe can be taken manually by means of the L200 front panel key and differences calculated by the user.
Te design of the dry block ensures that all sensors located in its ‘well’ will be at exactly the same temperature. Te necessary calculations can be performed in a spreadsheet by applying formulae to the relevant cells and the logged values imported into
the worksheet. On this basis, the steriliser probes are traceably calibrated in-house for full compliance with specified testing and validation procedures.
Te accuracy of a type T, Class 1 thermocouple is similar to that of a Pt100 Class B; nominally ±0.5o
C and ±0.3o yet at 0o C respectively, C a Class A Pt100 will provide an order greater accuracy.
Measurement uncertainty with such a system will be of the order of ±0.6o
C for both types of sensor
at a typical working temperature. For more information ✔ at
www.scientistlive.com/eurolab
Labfacility offers a simple method of sensor checking and traceable calibration.
Martin Riddett is MD of Labfacility.
www.labfacility.com
For more information ✔ at
www.scientistlive.com/eurolab
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