Lake Shore Model 234/234D User’s Manual
2-2
Installation
2.3
SENSOR INSTALLATION RECOMMENDATIONS
See the Lake Shore Product Catalog for installation details and sensor
specifications. Call Lake Shore for copies of application notes or sensor
installation questions.
1. Do not ground the sensor.
2. Shield leads and connect shield wire to SHIELD on screw terminal
connector only. Do not connect shield at other end of cable.
3. Keep leads as short as possible.
4. Use twisted-pair wire. Use Lake Shore Duo-Twist™ wire (or equivalent)
for two-wire, or Quad-Twist™ wire (or equivalent) for four-wire
applications.
5. Thermally anchor lead wires.
2.3.1
Sensor Mounting
Before installing the
carbon-glass or
Germanium sensor,
identify the leads as
shown. Be sure lead
identification remains
clear even after
sensor installation.
Record the sensor
serial number and
location.
When installing the sensor, make sure there are no electrical shorts or
current leakage paths between the leads or between the leads and ground.
If IMI-7031 varnish or epoxy is used, it may soften varnish-type lead
insulations so that high resistance shunts appear between wires if
sufficient
time for curing is not allowed
.
Slide Teflon
®
spaghetti tubing over bare leads when the possibility of
shorting exists. Avoid putting stress on the device leads and allow for
thermal contractions that occur during cooling which could fracture a solder
joint or lead if installed under tension at room temperature.
For temporary mounting in cold temperature applications, apply a thin layer
of Apiezon
®
N Grease between the sensor and sample to enhance thermal
contact under slight pressure.
CAUTION: Lake Shore will not warranty replace any device damaged
by user-designed clamps or solder mounting.
For semi-permanent mountings, use Stycast epoxy instead of Apiezon
®
N
Grease. In all cases, periodically inspect the sensor mounting to verify good
thermal contact to the mounting surface is maintained.
Summary of Contents for 234
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