Table of Contents
Advertisement
4 Installation
4.1 Environmental Issues
Ideally, temperature calibration 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
When in use, the PRT must be mounted carefully to avoid any damage to the sheath
or sensor. If using mechanical clamps to secure the PRTs while in use, care should
be taken not to over tighten the clamping device. Over tightening will damage the
sheath or lead wires. If metal comparison blocks are used in the bath, maintain a
close fit between the thermometer sheath and the well in the comparison block. How-
ever, allow for the thermal expansion of the thermometer sheath when determining
block well tolerances.
4.3 Lead Wire Identification
The 5606 and 5607 PRTs are equipped with a four-wire cable. The same circuit sche-
matic applies to both PRTs (see Figure 1 on this page). Four lead wires are used to
cancel lead wire resistance. For best results, the readout device should be equipped to
handle four-terminal resistors.
RED
BLACK
Figure 1
PRT Schematic
The lead wires are four different colors. Lead wire pairs attached to each end of the
sensor are identified as shown in Figure 1 on this page.
WHITE
GREEN
Installation
LeadWireIdentification
7
Advertisement
Table of Contents
