Sprt Care And Handling Guidelines; Sprt Care; Sprt Handling Guidelines - Fluke 5680 User Manual

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5

SPRT Care and Handling Guidelines

5.1

SPRT Care

CAUTION: READ THIS SECTION BEFORE REMOVING THE SPRT
FROM THE SHIPPING BOX OR CASE
The 5680/5682/5699 Standard Platinum Resistance Thermometers (SPRTs) are
extremely delicate instruments. Great care must be taken when handling the
SPRT to maintain the calibration accuracy. Vibration or shock may cause the
resistance to increase. A slight tap to the SPRT tip as it is removed from an in-
strument can cause a change in R
SPRT will prolong the life expectancy. When not in use, the SPRT should be
stored in the protective case provided by Hart Scientific.
5.2

SPRT Handling Guidelines

1.
DO keep the thermometer as clean as possible. Always remove any fluid
from the sheath immediately after taking the thermometer from a bath.
2.
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
SPRT to comfortably slip in and out without excess movement. For best
results, immerse the thermometer as deep as possible to avoid "stem ef-
fect" (the temperature error caused by the conduction of heat away from
the sensor). Do not submerge the handles.
3. DO allow sufficient time for the thermometer to stabilize before making
measurements allowing for the best accuracy.
4.
DO use the correct drive current with the thermometer to prevent error in
temperature or resistance.
5.
DO anneal the thermometer at 480°C for the 5680 and 5682, and at
661°C for the 5699 when it has been subjected to mechanical or temper-
ature shock. The SPRT should also be annealed before calibration.
6.
DO use the protective case provided or other protection when the ther-
mometer is not in use.
7.
DON'T subject the thermometer to any physical shock or vibration.
8.
DON'T subject the thermometer to temperatures above the highest spec-
ified operating temperature.
9.
DON'T expose the thermometer's handle or cables to extreme
temperatures.
10. DON'T submerge the handle or cable in liquids.
Fluke-Direct
5 SPRT Care and Handling Guidelines
as high as 1 mK. Correct handling of the
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SPRT Care
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