Cryo-con Model 24C
Appendix E: Sensor Data
The BB Sensor Package
The BB package is an industry standard 0.310" bobbin package that features
excellent thermal contact to the internal sensing element. This ensures a rapid
thermal response and minimizes thermal gradients between the sensing element and
the sensor package. Mechanical integrity of the sensor assures reliable performance
even in severe applications.
With the bobbin package, the lead wires are thermally anchored to the sensor
mounting. This is essential for accurate sensor readings.
Connections to the BB package are made using a color-coded four-wire, 36 AWG
cryogenic ribbon cable.
Wires may be separated by dipping in Isopropyl Alcohol and
then wiping clean.
Insulation is Formvar
®
and is difficult to strip. Techniques
include use of a mechanical stripper, scrapping with a razor
blade and passing the wire quickly over a low flame.
Cable Color Codes
V+
Clear
V-
Green
I+
Black
I-
Red
164
Bobbin Package Specifications
Bobbin Material
Gold plated Oxygen free hard Copper.
Marking
Individual serial number.
Sensor Bonding
Stycast
â
epoxy.
Mass
1.1g excluding leads.
Leads
36 inches, 36AWG Phosphor-Bronze. Four-
lead color coded cryogenic ribbon cable.
Insulation is heavy Formvar
®
.
Mounting
4-40 machine screw.
Temperature
400K Maximum.
Table 37: BB Package Specifications
