Lakeshore 332 User Manual page 15

Sensor Selection Guide (Continued)
Rox™ RTD thick film sensors are useful in low temperature applications in magnetic fields, with a very
low incidence of magnetic field errors. Each model adheres to a single resistance versus
temperature curve. The Rox Models RX-102A and RX-202A are useful to temperatures as low as
50 mK, with accuracy to within ±5 mK at 50 mK; the RX-202A also offers an upper temperature
range to 300 K. The Model 332 configured with Rox RTDs should only be used down to 1 K.
Thermocouples offer uniform sensitivity over a wide temperature range and measure the highest
temperatures possible with the Model 332. While many types are inexpensive and standard curves
are available, thermocouples are less accurate than other sensors. Repeatability is highly
dependent upon installation.
Sensor Type
Temperature Coefficient
Input Range
Sensor Excitation
*
(Constant Current)
Display Resolution
Example Lake Shore Sensor
Standard Sensor Curve
Typical Sensor Sensitivity
Measurement Resolution:
Sensor Units
Temperature Equivalence
Electronic Accuracy:
Sensor Units
Temperature Equivalence
Temperature Accuracy including
electronic accuracy, CalCurve
and calibrated sensor
Control Stability:
Sensor Units
Temperature Equivalence
Magnetic Field Use
* Current reversal eliminates thermal EMF voltage errors for resistor sensors.
†
Typical sensor sensitivities were taken from representative calibrations for the sensor listed.
Introduction
Lake Shore Model 332 Temperature Controller User's Manual
Table 1-2. Model 332 Typical Sensor Performance Chart
Silicon Diode
Negative
0 – 2.5 V
10 µA ±0.05%
100 µV
(Sensor Units)
DT-470-SD-13 with
1.4H calibration
Curve 10
–31.6 mV/K at 4.2 K
–1.73 mV/K at 77 K
†
–2.3 mV/K at 300 K
–2.12 mV/K at 475 K
10 µV
0.3 mK at 4.2 K
5.8 mK at 77 K
4.4 mK at 300 K
4.7 mK at 475 K
±80 µV ±0.005%
of reading
±5 mK at 4.2 K
±75 mK at 77 K
±47 mK at 300 K
±40 mK at 475 K
±26 mK at 4.2 K
±130 mK at 77 K
±107 mK at 300 K
±100 mK at 475 K
±20 µV
±0.6 mK at 4.2 K
±11 mK at 77 K
±8.4 mK at 300 K
±9 mK at 475 K
Recommended for
T ≥ 60 K & B ≤ 3 T
100 Ω Platinum RTD
GaAlAs Diode
500 Ω Full scale
Negative Positive
0 – 7.5 V
0 – 500 Ω
10 µA ±0.05% 1 mA
100 µV
10 mΩ
TG-120-SD with PT-103 with
1.4H calibration 14J calibration
Requires calibrated DIN 43760
sensor
–210 mV/K at 4.2 K 0.19 Ω/K at 30 K
–1.25 mV/K at 77 K 0.42 Ω/K at 77 K
–2.85 mV/K at 300 K 0.39 Ω/K at 300 K
0.36 Ω/K at 800 K
–3.15 mV/K at 475 K
20 µV
2 mΩ
0.1 mK at 4.2 K
10.6 mK at 30 K
16.0 mK at 77 K
4.8 mK at 77 K
7.1 mK at 300 K
5.2 mK at 300 K
6.3 mK at 475 K
5.6 mK at 800 K
±80 µV ±0.01%
±0.004 Ω ±0.01%
of reading
of reading
±3 mK at 4.2 K
±23 mK at 30 K
±180 mK at 77 K
±14 mK at 77 K
±60 mK at 300 K
±39 mK at 300 K
±38 mK at 475 K
±95 mK at 800 K
±20 mK at 4.2 K ±48 mK at 30 K
±255 mK at 77 K ±39 mK at 77 K
±180 mK at 300 K ±84 mK at 300 K
±123 mK at 475 K ±195 mK at 800 K
±40 µV
±4 mΩ
±0.2 mK at 4.2 K
±22 mK at 30 K
±32 mK at 77 K
±9.5 mK at 77 K
±14 mK at 300 K
±10 mK at 300 K
±13 mK at 475 K
±11 mK at 800 K
Recommended for Recommended for
T > 4.2 K & B ≤ 5 T T > 40 K & B ≤ 2.5 T
Rox™
Negative
0 – 7500 Ω
10 µA ±0.05%
100 mΩ
RX-102A-AA with
0.3E calibration
Requires calibrated
sensor
–80 Ω/K at 4.2 K
–4 Ω/K at 20 K
–1.06 Ω/K at 40 K
40 mΩ
<1 mK at 4.2 K
10 mK at 20 K
38 mK at 40 K
±0.10 Ω ±0.04%
of reading
±8.1 mK at 4.2 K
±134 mK at 20 K
±491 mK at 40 K
±24.1 mK at 4.2 K
±238 mK at 20 K
±705 mK at 40 K
±80 mΩ
±1 mK at 4.2 K
±20 mK at 20 K
±76 mK at 40 K
Recommended for
T > 2 K & B ≤ 10 T
1-5