CALsys -30/110 Tempsens Instrument Việt Nam 

CALsys -30/110   CALsys -15/110   CALsys -120SP   CALsys -250   CALsys -650   CALsys -1200

An evaluation report of the CALsys -30/110 Dry block bath

Manufactured by Tempsens Instruments (II) Pvt Ltd

INTRODUCTION

The CALsys -30/110 is the latest version of Tempsens most popular High Accuracy Dry Block calibration Bath. It works over the temperature range -30 Deg C to 110 Deg C.

At Tempsens it is our earnest desire to present for our customer’s consideration as much useful information as possible and to this end we have spent a substantial amount of time evaluating our products.

The results of the evaluation of an Accuracy liquid calibration Bath can be presented in many formats some of which will give an optimistic or indeed a pessimistic view of how the products operate.

A. Radial Temperature Homogeneity:

What is Radial Temperature Homogeneity and why it is important to measure

Radial uniformity refers to temperature differences between wells of the block or sleeve. This nonuniformity is strongly influenced by the difference between the block and ambient temperature.  A larger  temperature  difference  from ambient  will result  in  a  larger  potential temperature calibration error. Therefore radial inhomogeneity should be measured at extremes (relative to ambient temperature) in an instrument’s temperature range.

Test method:

The temperature differences between the zones in the individual bores provided for the measurements are measured with one or several suitable thermometers at three different temperature representative of the field  of application and  covering  the extreme temperature which may occur. If there is only one bore no measurement has to be carried out.

For CALsys -30/110, we consider -30 Deg C, 0 Deg C and 110 Deg C respectively. As example at 50 Deg C two RTD (designed for small steam conduction) were placed in each of the holes. Measurements were recorded and then the probes were interchanged between the two pockets and repeat measurements made. The temperature Difference was calculated to remove the small offsets between the two probes.

For calibrators having fewer than four wells, it may be necessary to determine differences by cyclic exchange. The difference between two wells with two thermometers may be determined with the following Formula:

Temperature Difference = [((P1W1 – P1W2) + (P2W1 - P2W2)) / 2}]

Note: P1 = probe 1, W1 = well 1 and so on. P1W1 is read as the value of probe 1 in well 1.