GE CTR 80 6 Bath Use

6 Bath Use

Caution: READ this section BEFORE PLACING THE BATH IN SERVICE

The information in this section is for general informationonly. It is not de-

signed to be the basis for calibration laboratory procedures. Each laboratory

will need to write their own specific procedures.

Be sure to select the correct fluid for the temperature range of the calibration.

Bath fluids should be selected to operate safely with adequatethermal proper-

ties to meet the application requirements. Also, be aware that some fluids ex-

pand and could overflowthe bath if not watched. Refer to General Operation,

Section8, for information specific to fluid selectionand to the MSDS sheet spe-

cific to the fluid selected. The temperature range of any single fluid is likely

less than that of the bath itself. This means thatthe type of bath fluid may have

to change to cover the full range of the bath (see Section8.1.1). Baths are most

often set up to operate with a single fluidonly over the useful range of that

fluid. Other baths can be set up with other fluids to coverother temperature

ranges required. This is generally the most productiveand efficient approach.

The bath generates extreme temperatures. Precautions must be taken to prevent

personal injury or damage to objects. Probes may be extremelyhot or cold

when removed from the bath. Cautiouslyhandle probes to prevent personal in-

jury.Carefully place probes on a heat/cold resistant surface or rack u ntil they

are at room temperature. It is advisable to wipe the probe with a clean soft cloth

or paper towel before inserting it intoanother bath. This prevents the mixing of

fluids from one bath to another.Always be sure that the probe is completely

dry before inserting it into a hot fluid.Some of the high temperaturefluids

react violently to water or other liquid mediums. Be aware that cleaning the

probe can be dangerous if the probe has not cooled to room temperature.

For optimum accuracy and stability,allow the bath adequate stabilization time

after reaching the set-point temperature.

Comparison calibration involvestesting a probe (unit under test, UUT) against

a reference probe. After inserting the probes to be calibrated into the bath, al-

low sufficient time for the probes to settle and the temperature of the bath to

stabilize.

One of the significant dividends of using a bath rather than a dry-well to cali-

brate multiple probes is that the probes do not need to be identical in construc-

6Bath Use