Lake Shore Model 331 Temperature Controller User’s Manual
1.2 SPECIFICATIONS
Table 1-3. Input Specifications
Sensor
Temperature
Coefficient
Input Range Excitation Current
Display
Resolution
Measurement
Resolution
Electronic Accuracy
Electronic
Control
Stability
11
Diode negative 0 V to 2.5 V 10 µA ±0.05%
12,13
100 µV 10 µV ±80 µV ±0.005% of rdg ±20 µV
negative 0 V to 7.5 V 10 µA ±0.05%
12,13
100 µV 20 µV ±80 µV ±0.01% of rdg ±40 µV
PTC RTD positive
0 Ω to 500 Ω
1 mA
14
10 mΩ 2 mΩ ±0.004 Ω ±0.01% of rdg ±4 mΩ
positive
0 Ω to 5000 Ω
1 mA
14
100 mΩ 20 mΩ ±0.04 Ω ±0.02% of rdg ±40 mΩ
NTC RTD negative
0 Ω to 7500 Ω
10 µA ±0.05%
14
100 mΩ 40 mΩ ±0.1 Ω ±0.04% of rdg ±80 mΩ
Thermocouple positive ±25 mV NA 1 µV 0.4 µV ±1 µV ±0.05% of rdg
15
±0.8 µV
positive ±50 mV NA 1 µV 0.4 µV ±1 µV ±0.05% of rdg
15
±0.8 µV
11
Control stability of the electronics only, in an ideal thermal system
12
Current source error has negligible effect on measurement accuracy
13
Diode input excitation can be set to 1 mA – refer to Paragraph 4.4.2
14
Current source error is removed during calibration
15
Accuracy specification does not include errors from room temperature compensation
Thermometry
Number of inputs 2
Input configuration Each input is factory configured for either diode/RTD or thermocouples
Isolation Sensor inputs optically isolated from other circuits but not each other
A/D resolution 24-bit
Input accuracy Sensor dependent – refer to Input Specifications table
Measurement resolution Sensor dependent – refer to Input Specifications table
Maximum update rate 10 readings/s on each input (except 5 readings/s on input A when configured
as thermocouple)
User curves Room for twenty 200-point CalCurves™ or user curves
SoftCal™ Improves accuracy of DT-470 diode to ±0.25 K from 30 K to 375 K; improves
accuracy of Platinum RTDs to ±0.25 K from 70 K to 325 K – stored as user
curves
Math Maximum, Minimum, and Linear Equation (Mx + B) or M(x+B)
Filter Averages 2 to 64 input readings
Table 1-4. Sensor Input Configuration
Diode/RTD Thermocouple
Measurement type 4-lead differential 2-lead, room temperature compensated
Excitation
Constant current with current reversal for
RTDs
NA
Supported sensors
Diodes: Silicon, GaAlAs RTDs: 100 Ω
Platinum, 1000 Ω Platinum, Germanium,
Carbon-Glass, Cernox™, and Rox™
Most thermocouple types
Standard curves
DT-470, DT-500D, DT-670, PT-100, PT-
1000, RX-102A, RX-202A
Type E, Type K, Type T, AuFe 0.07%
vs. Cr, AuFe 0.03% vs. Cr
Input connector 6-pin DIN Ceramic isothermal block
1-6 Introduction
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