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User's Guide
5-2
5.2 PRT Handling Guidelines
• DO anneal the thermometer after shipment. Shipping the thermometer can
cause mechanical shocks that affect the accuracy of the thermometer.
Therefore, if possible, we advise that the thermometer be annealed before
use. The thermometer should be annealed at 500 °C overnight or 660 °C for
four (4) hours.
• DO keep the thermometer as clean as possible. Always remove any fluid
from the sheath immediately after taking the thermometer from a bath.
• DO immerse the thermometer in the appropriate liquid for the temperature
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 sensor).
Do not submerge the handles.
• 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. Fluke recommends 1mA.
• DO anneal the thermometer at 600 to 661 °C for 12 hours if it becomes
oxidized.
• DO use the protective shipping box or case 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
temperatures. The temperature limits of the handle are: 0 °C to 80 °C
• DO NOT submerge the handle or cable in liquids.
• DO NOT screw a clamp down so tight that it dents the sheath. This can
permanently damage the PRT.
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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