Specifications

 
 
Standard curve Not applicable
 
Recommended excitation1
20 µV (0.1 K to 0.5 K); 63 µV (0.5 K to 1 K);
10 mV or less for T > 1.2 K
 
Dissipation at recommended excitation Typical 10-5 W at 300 K, 10-7 W at 4.2 K, 10-13 W at 0.3 K (model and temperature dependent)
 
Thermal response time (typical) BC, BR, BG: 1.5 ms at 4.2 K, 50 ms at 77 K, 135 ms at 273 K; SD: 15 ms at 4.2 K, 0.25 s at 77 K, 0.8 s at 273 K; AA: 0.4 s at 4.2 K, 2 s at 77 K, 1.0 s at 273 K
 
Use in radiation Recommended for use in radiation environments – for more information click here
 
Use in magnetic field Recommended for use in magnetic fields at low temperatures. The magneto-resistance is typically negligibly small above 30 K and not significantly affected by orientation relative to the magnetic field – for more information click here
 
Reproducibility2 ±3 mK at 4.2 K
 
Soldering standard J-STD-001 Class 2
 
1 Recommended excitation for T < 1 K based
on Lake Shore calibration procedures using an
AC resistance bridge – for more information refer
2 Short-term reproducibility data is obtained by
subjecting sensor to repeated thermal shocks
from 305 K to 4.2 K
Range of Use
 Minimum
limit3
Maximum limit
Cernox™ 0.10 K325 K
Cernox™ HT 0.10 K420 K
3 Model dependent
Calibrated Accuracy4
 Typical sensor accuracy5
Long-term
stability6
1.4 K ±5 mK ±3 mK
4.2 K±5 mK±3 mK
10 K±6 mK±6 mK
20 K±9 mK±12 mK
30 K±10 mK±18 mK
50 K±13 mK±30 mK
77 K±16 mK±46 mK
300 K±40 mK±180 mK
400 K±65 mK
4 Bare chip sensors can only be calibrated after attaching gold wire leads – the user must remove the ball bonded leads if they are not desired (the bond pads are large enough for additional bonds)
5
[(Calibration uncertainty)2 + (reproducibility)2]0.5 for more information see Appendices B, D, and E
6 Long-term stability data is obtained by subjecting sensor to 200 thermal shocks from 305 K to 77 K
 
 
Temperature Response Data Table (typical)
 CX-1010CX-1030CX-1050
T(K)R8(Ω)dR/dT
(Ω/K)
(T/R)·
(dR/dT)
R(Ω)dR/dT
(Ω/K)
(T/R)·
(dR/dT)
R(Ω)dR/dT
(Ω/K)
(T/R)·
(dR/dT)
4.2277.32-32.209-0.49574.20-97.344-0.713507.2-1120.8-1.34
10187.11-8.063-0.43331.67-19.042-0.571313.5-128.58-0.98
20138.79-3.057-0.44225.19-6.258-0.56692.81-30.871-0.89
30115.38-1.819-0.47179.12-3.453-0.58482.88-14.373-0.89
77.3570.837-0.510-0.56101.16-0.820-0.63205.67-2.412-0.91
30030.392-0.065-0.6541.420-0.088-0.6459.467-0.173-0.87
400 (HT) 34.779-0.050-0.5746.782-0.093-0.79
420 (HT)33.839-0.045-0.5545.030-0.089-0.77
   
 CX-1070CX-1080
T(K)R8(Ω)dR/dT
(Ω/K)
(T/R)·
(dR/dT)
R(Ω)dR/dT
(Ω/K)
(T/R)·
(dR/dT)
4.25979.4-2225.3-1.56
101927.2-214.11-1.11
20938.93-46.553-0.996157.5-480.08-1.56
30629.90-20.613-0.983319.7-165.61-1.50
77.35248.66-3.150-0.98836.52-15.398-1.42
30066.441-0.201-0.91129.39-0.545-1.26
400 (HT) 51.815-0.106-0.8191.463-0.261-1.14
420 (HT)49.819-0.094-0.8086.550-0.231-1.12
8 Cernox sensors do not follow a standard response curve — the listed resistance ranges are typical, but can vary widely; consult Lake Shore to choose a specific range
 
Physical Specifications
 MassLead typeInternal
atmosphere
Sensor
materials
Bare chip
(BC), (BG), (BR)
≤ 3.0 mg
BR: none
 
BG: two 2 mil
(44 AWG)
bare gold
25 mm long wires
 
BC: two 2.5 mil
(42 AWG)
bare copper
25 mm long wires
NACeramic oxynitride, gold pads and sapphire substrate with Au Pt Mo back (chip in all models)
Hermetic ceramic package
(SD)
≈40 mg2 gold-plated copper VacuumChip mounted on sapphire base with alumina body and lid, Mo/Mn with nickel and gold plating on base and lid, Gold-tin solder as hermetic lid seal, 60/40 SnPb solder used to attach leads
Copper canister package
(AA)
≈390 mg4 phosphor bronze with HML heavy build insulation attached with epoxy strain relief at sensor
Helium 4
(4He) is standard
Chip mounted in gold plated cylindrical copper can

AA package
Wires with the same color code are connected to the same side of the sensor (looking at epoxy seal with leads toward user)
cernoxts_aa_pack
Cernox® Calibration Ranges
cernox-calibrations

 

Typical Magnetic Field-Dependent Temperature Errors7 ΔT/T (%) at B (magnetic induction)
Cernox™ 1050
T (K)2.5 T 8 T14 T19 T
21.33.13.95
4.20.1-0.15-0.85-0.8
100.04-0.4-1.1-1.5
200.040.02-0.16-0.2
300.010.040.060.11
770.0020.0220.0620.11
3000.0030.0040.0040.006
7 Excellent for use in magnetic fields, depending on temperature range (>2 K)
Magnetic Field Dependence Data for Sample CX RTDs
cernoxts_gr1
Typical temperature reading errors for operation of CX-1050 sensors in magnetic fields at temperatures from 2.03 K to 286 K. “Low temperature thermometry in high magnetic fields VII. Cernox™ sensors to 32 T,” B. L. Brandt, D. W. Liu and L. G. Rubin; Rev. Sci. Instrum., Vol. 70, No. 1, 1999, pp 104-110.
 
Neutrons and Gamma Rays
cernoxts_gr2
 
Typical Calibration Shifts
cernoxts_gr3
Typical calibration shift after 200 thermal shocks from 305 K to 77 K for a Model CX-1030 temperature sensor ( ΔT = 1 mK at 4.2 K and 10 mK at 100 K).
 
CX-BR
 
CX-SD
 
AA