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It’s not always possible or practical to remove

instruments from a process for calibration. In situ

verification at a single point may be the only way

to know whether an instrument is performing

as expected. A single point verification is

most effective over a narrow temperature

range and when combined with other trends

and information related to the process and

equipment. It also requires the process not to be

in a dynamic state of change.

In a single point process temperature verification,

a temperature standard such a reference PRT

connected to a readout such as a 1523A is

placed in thermal equilibrium with the sensor of

the instrument to be verified without removing

it from the process. Usually this is accomplished

with a test well that is installed in a location

adjacent to the sensor to be tested.

The reading from the temperature standard is

compared to the reading on the panel meter,

controller, or transmitter to determine the error

and prove the tolerance condition of the loop.

Suggested test tools

Using a precision thermometer for single

point process temperature verification

1551A Ex “Stik”

Thermometer

Readout

See pg 20

1524-P1

Reference

Thermometer

See pg 20

1523-P1

Reference

Thermometer

See pg 20

1552A Ex “Stik”

Thermometer

Readout

See pg 20

52

Temperature Applications