Fluke 5623A - Manual (Page 14)

5 PRT Care and Handling Guidelines
5.1 PRT Care
CAUTION: READ THIS SECTION BEFORE REMOVING THE PRT
FROM THE SHIPPING BOX OR CASE
Care must be taken in handling the PRT to maintain calibration accuracy. Care
should still be used when handling the PRT even though the Inconel sheath is
durable and provides good protection for the sensor. Correct handling of the
PRT will prolong the life expectancy. When not in use, the PRT should be
stored in an optional protective case that can be purchased from Hart Scientific.
The handle is designed to be immersed.
5.2 PRT Handling Guidelines
• DO keep the thermometer as clean as possible.
• DO immerse the thermometer in the appropriate liquid for the tempera-
ture range. If a dry block is used, the well diameter should allow the PRT
to comfortably slip in and out without excess movement. For best results,
immerse the thermometer as deep as possible to avoid “stem effect” (the
temperature error caused by the conduction of heat away from the sen-
sor).
• DO allow sufficient time for the thermometer to stabilize before making
measurements. This allows for the best accuracy.
• DO use the correct drive current with the thermometer to prevent error in
temperature or resistance. Hart Scientific recommends 1mA.
• DO use the protective shipping box provided or other protection when the
thermometer is not in use.
• DO NOT subject the thermometer to any physical shock or vibration.
• DO NOT use pliers or other devices to squeeze the sheath. This action
can permanently damage the PRT.
• DO NOT subject the thermometer to temperatures above the highest
specified operating temperature.
• DO NOT expose the thermometer’s handle or cables to extreme tempera-
tures. The temperature limits of the handle are: –200°C to 156°C
5623A 11
5 PRT Care and Handling Guidelines