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Omega Model CYD201/202 User’s Manual
Installation 2-9
Connecting Leads To The Sensor (Continued)
Thermally anchor lead wires at several temperatures between room
temperature and cryogenic temperatures to guarantee no heat conduction
through the leads to the sensor.
2.4.3 Sensor
Mounting
Before installing a diode sensor, identify which lead is the anode and which
is the cathode. When viewed with the base down and the leads towards the
observer, the anode is on the right and the cathode is on the left. The silicon
diode sensor lead configuration is shown to the right. For other sensors,
read accompanying literature or consult the manufacturer to positively
identify sensor leads. Lead identification should remain clear even after
sensor installation. Record the sensor serial number and location.
CY7-SD
Diode Sensor Leads
Anode
Cathode
On the CY7-SD, the base is the largest flat surface. It is sapphire with gold
metalization over a nickel buffer layer. The base is electrically isolated from
the sensing element and leads; make all thermal contact to the sensor
through the base. A thin braze joint around the sides of the SD package
electrically connect to the sensing element. Avoid contact to the sides with
any electrically conductive material.
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. The preferred method for mounting the
sensor is the Omega CO Adapter.
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