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4 Installation
4.1 Environmental Issues
Primary standard equipment should be used in a calibration laboratory or other
facility specifically designed for this purpose. Environmental requirements
include:
•
Stable temperature and relative humidity <80%
•
Clean, draft-free area
•
Low noise level: low radio frequency, magnetic or electrical interference
•
Low vibration levels
4.2 Mounting
Most often temperature standards, primary and secondary, are used to calibrate
other temperature-sensitive equipment.
The SPRT must be mounted carefully to avoid any damage to the sensor. If the
fluid bath used does not have a lid designed for SPRT insertion, clamps should
be used to ensure that the handle and cable are not immersed. Do not screw the
clamps too tight. Over tightening will damage the sheath. If metal comparison
blocks are used in the bath, maintain a close fit between the thermometer
sheath and the well in the comparison block. However, allow for the thermal
expansion of the thermometer sheath when determining block well tolerances.
4.3 Lead Wire Identification
The Model 5680/5682/5699 SPRTs are equipped with a five-wire cable. Four
lead wires are used to cancel lead wire resistance. The fifth wire is a ground
wire which is connected to the Inconel sheath. For best results, the readout de
-
vice should be equipped to handle four-terminal resistors.
The lead wire colors are red, black, white, yellow, and green. Lead wire pairs,
attached to each end of the sensor, are identified by heat shrink tubing. Red and
black wires have red heat shrink tubing. Blue and white wires have black heat
11
4 Installation
Environmental Issues
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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