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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
 
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 K 325 K
Cernox™ HT 0.10 K 420 K
3 Model dependent
Calibrated Accuracy4
Typical sensor accuracy5
Long-term
stability6
1.4 K ±5 mK ±25 mK
4.2 K ±5 mK ±25 mK
10 K ±6 mK ±25 mK
20 K ±9 mK ±25 mK
30 K ±10 mK ±25 mK
50 K ±13 mK ±25 mK
77 K ±16 mK ±25 mK
300 K ±40 mK ±153 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-1010 CX-1030 CX-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)
4.2 277.32 -32.209 -0.49 574.20 -97.344 -0.71 3507.2 -1120.8 -1.34
10 187.11 -8.063 -0.43 331.67 -19.042 -0.57 1313.5 -128.58 -0.98
20 138.79 -3.057 -0.44 225.19 -6.258 -0.56 692.81 -30.871 -0.89
30 115.38 -1.819 -0.47 179.12 -3.453 -0.58 482.88 -14.373 -0.89
77.35 70.837 -0.510 -0.56 101.16 -0.820 -0.63 205.67 -2.412 -0.91
300 30.392 -0.065 -0.65 41.420 -0.088 -0.64 59.467 -0.173 -0.87
400 (HT) 34.779 -0.050 -0.57 46.782 -0.093 -0.79
420 (HT) 33.839 -0.045 -0.55 45.030 -0.089 -0.77
CX-1070 CX-1080
T(K) R8(Ω) dR/dT
(Ω/K)
(T/R)·
(dR/dT)
R(Ω) dR/dT
(Ω/K)
(T/R)·
(dR/dT)
4.2 5979.4 -2225.3 -1.56
10 1927.2 -214.11 -1.11
20 938.93 -46.553 -0.99 6157.5 -480.08 -1.56
30 629.90 -20.613 -0.98 3319.7 -165.61 -1.50
77.35 248.66 -3.150 -0.98 836.52 -15.398 -1.42
300 66.441 -0.201 -0.91 129.39 -0.545 -1.26
400 (HT) 51.815 -0.106 -0.81 91.463 -0.261 -1.14
420 (HT) 49.819 -0.094 -0.80 86.550 -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 specifc range
Physical Specifications
Mass Lead type Internal
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
NA Ceramic oxynitride, gold pads and sapphire substrate with Au Pt Mo back (chip in all models)
Hermetic ceramic package
(SD)
≈40 mg 2 gold-plated copper Vacuum Chip 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 mg 4 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)
Typical Magnetic Field-Dependent Temperature Errors7 ΔT/T (%) at B (magnetic induction)
Cernox™ 1050
T (K) 2.5 T 8 T 14 T 19 T
2 1.3 3.1 3.9 5
4.2 0.1 -0.15 -0.85 -0.8
10 0.04 -0.4 -1.1 -1.5
20 0.04 0.02 -0.16 -0.2
30 0.01 0.04 0.06 0.11
77 0.002 0.022 0.062 0.11
300 0.003 0.004 0.004 0.006
7 Excellent for use in magnetic fields, depending on temperature range (>2 K)
Magnetic Field Dependence Data for Sample CX RTDs
Click to Enlarge
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
Click to Enlarge
Typical Calibration Shifts
Click to Enlarge
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).
Click to Enlarge
Click to Enlarge