Industrial Dual-Block Calibrator - Fluke Calibration Instruments - Hart Scientific - #2

~~ Hart Scientific⁵

To get the most accurate calibrations possi­ble from a dry-well calibrator, you should use an external reference thermometer. If, however, you are not using an external ref­erence, there are a few important things you should keep in mind.

First, you are using a reference. You're comparing the reading of your test probe against the display of the dry-well. The dry-well display is based on its own control sensor, usually located at the bottom of the well. Therefore, to make the best compari­son, your test probe should be inserted to the same depth as the control sensor. This was the method used when the dry-well's display was calibrated at the factory.

Second, your test probe should fit snugly into one of the test wells. Again, this is how it was originally calibrated at the factory. If

Industrial Dual-Block Dry-Well (X = case color. Specify "B" for black or "Y" for yellow.) Includes two 1/4 in (6.4 mm) and two 3/16 in (4.8 mm) inserts. Insert, Blank Insert, 1/16in(1.6mm) Insert, 1/8 in (3.2 mm) Insert,3/16in(4.8mm) Insert, 1/4 in (6.4 mm) Insert, 5/16in(7.9mm) Insert, 3/8 in (9.5 mm) Insert,7/16in(11.1mm) Insert,5/32in(4mm)

your probe is too loose, thermal contact is poor and a large error has been introduced. Custom inserts are available to help solve this problem.

Third, you should not introduce fluids into the wells of a dry-block in an attempt to improve thermal contact. It is too danger­ous. If thermal contact is so poor that you're thinking about doing this, consider buying a fluid bath instead. Micro-Baths are avail­able that are just as portable and easy to use as dry-wells.

The point is that the accuracy specs of your dry-well are based upon how the manufacturer calibrates it. If you're relying on those specs, you need to use the dry-well the same way they do—with a good, snug fit at the bottom of the well.