NTC Cryogenics
Thermometrics
Thermistors
Applications
All Cryogenic Type Thermistor probes are
designed for use in the range of 77°F (room
temperature) to -320.8°F (the boiling point of
Liquid Nitrogen) (25°C to -196°C). These units
are very stable, exhibit no hysteresis effects,and
rapid temperature cycling from 77°F to -320.8°F
(25°C to -196°C) has no measurable effect on
electrical, thermal or mechanical properties.
These units are well suited for Cryogenic control
applications such as liquid level in the 77°F to
-320.8°F (25°C to -196°C) range. They may be used
at temperatures below the Nitrogen Point with
suitable instrumentation.
Description
Cryogenic thermistor probes consist of a pressed
disc thermistor attached to #27 AWG silver lead
wires.
Data
Cryogenic type thermistor probes may be
exposed to 221°F (105°C) for short periods;
however, long term storage at or above 140°F
(60°C) may result in some resistance change,
therefore storage below 140°F (60°C) is
recommended for best stability.
Amphenol
Advanced Sensors
Cryogenics
Specifications
Thermal And Electrical Properties
Table A: RL Cryogenics
Type
Coefficient
RL1004-10K-
0-S1
Operation
In Liquid
Oxygen
Nitrogen
Resistance
(Ω)
10K ± 20%
31.5K
Nominal
Temp.
Coef.
%/K
–8.4
–10.4
Fig.
Diss.
Constant
mW/K
4
Cryogenic Probes —Type RL
These cryogenic thermistors are extremely useful for
liquid level detection in various cryogenic liquids. In
this application, the thermistor is slightly self-heated
by passing a small current through the unit. The heat
generated in the unit is more easily dissipated when the
thermistor is immersed in cryogenic fluid than when
the fluid level falls below the thermistor. The resulting
change in thermistor temperature is easily detected by
the change in resistance.
1
Dissipation constant is in still air (mW/K)
.125 in
(3.2 mm)
maximum
.11 in
(2.8 mm)
maximum
1.5 in
(38 mm)
minimum
AWG #27 .014 in (0.35 mm) silver
Figure 1
Amphenol
Advanced Sensors
www.amphenol-sensors.com
© 2014 Amphenol Corporation. All Rights Reserved. Specifications are subject to change without notice.
Other company names and product names used in this document are the registered trademarks or
trademarks of their respective owners.
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