1.2 S e n s o r Se l e cti o n 5
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1.2 Sensor
Selection
Silicon diodes are the best choice for general cryogenic use from 1.4 K to above room
temperature. Diodes are economical to use because they follow a standard curve and
are interchangeable in many applications. They are not suitable for use in ionizing
radiation or magnetic fields.
Cernox™ thin-film RTDs offer high sensitivity and low magnetic field-induced errors
over the 0.3 K to 420 K temperature range. Cernox sensors require calibration.
Platinum RTDs offer high uniform sensitivity from 30 K to over 800 K. With excellent
reproducibility, they are useful as thermometry standards. They follow a standard
curveabove 70 K and are interchangeable in many applications.
Model Useful range Magnetic field use
Diodes Silicon Diode DT-670-SD 1.4 K to 500 K T# 60 K & B " 3 T
Silicon Diode DT-670E-BR 30 K to 500 K T# 60 K & B " 3 T
Silicon Diode DT-414 1.4 K to 375 K T # 60 K & B " 3 T
Silicon Diode DT-421 1.4 K to 325 K T # 60 K & B " 3 T
Silicon Diode DT-470-SD 1.4 K to 500 K T # 60 K & B " 3 T
Silicon Diode DT-471-SD 10 K to 500 K T # 60 K & B " 3 T
GaAlAs Diode TG-120-P 1.4 K to 325 K T > 4.2 K & B " 5 T
GaAlAs Diode TG-120-PL 1.4 K to 325 K T > 4.2 K & B " 5 T
GaAlAs Diode TG-120-SD 1.4 K to 500 K T > 4.2 K & B " 5 T
Positive Tempera-
ture Coefficient RTDs
100 ) Platinum PT-102/3 14 K to 873 K T > 40 K & B " 2.5 T
100 ) Platinum PT-111 14 K to 673 K T > 40 K & B " 2.5 T
Rhodium-Iron RF-800-4 1.4 K to 500 K T > 77 K & B " 8 T
Rhodium-Iron RF-100T/U 1.4 K to 325 K T > 77 K & B " 8 T
Negative
Te m pe ra t u re
Coefficient RTDs
Cernox™ CX-1010 0.3 K to 325 K
1
T > 2 K & B " 19 T
Cernox™ CX-1030-HT 0.3 K to 420 K
1, 3
T > 2 K & B " 19 T
Cernox™ CX-1050-HT 1.4 K to 420 K
1
T > 2 K & B " 19 T
Cernox™ CX-1070-HT 4 K to 420 K
1
T > 2 K & B " 19 T
Cernox™ CX-1080-HT 20 K to 420 K
1
T > 2 K & B " 19 T
Germanium GR-300-AA 0.35 K to 100 K
3
Not recommended
Germanium GR-1400-AA 1.8 K to 100 K
3
Not recommended
Carbon-Glass CGR-1-500 1.4 K to 325 K T > 2 K & B " 19 T
Carbon-Glass CGR-1-1000 1.7 K to 325 K
2
T > 2 K & B " 19 T
Carbon-Glass CGR-1-2000 2 K to 325 K
2
T > 2 K & B " 19 T
Rox™ RX-102 0.3 K to 40 K
3
T > 2 K & B " 10 T
Rox™ RX-103 1.4 K to 40 K T > 2 K & B " 10 T
Rox™ RX-202 0.3 K to 40 K
3
T > 2 K & B " 10 T
Thermocouples
3060
Type K 9006-006 3.2 K to 1505 K Not recommended
Type E 9006-004 3.2 K to 934 K Not recommended
Chromel-AuFe 0.07% 9006-002 1.2 K to 610 K Not recommended
1
Non-HT version maximum temperature: 325 K
2
Low temperature limited by input resistance range
3
Low temperature specified with self-heating error: " 5 mK
TABLE 1-1 Sensor temperature range
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