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  Cernox
 
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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
to Appendix D and Appendix E

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
Limit
Maximum Limit
Cernox™
0.10 K3
325 K
Cernox™ HT
0.10 K3
420 K
3 Model dependent
Calibrated Accuracy
 

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
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(W)
dR/dT
(W/K)
(T/R)·
(dR/dT)
R(W)
dR/dT
(W/K)
(T/R)·
(dR/dT)
R(W)
dR/dT
(W/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(W)
dR/dT
(W/K)
(T/R)·
(dR/dT)
R(W)
dR/dT
(W/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 specific 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
 
 
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