Lake Shore Model 332 Temperature Controller User’s Manual
1.3 SPECIFICATIONS
Table 1-3. Model 332 Input Specifications
Input Type
Input
Range
Excitation Resolution
Electronic
Accuracy
Temperature
Coefficient
Display
Resolution
NTC-RTD
*
0 – 75
Ω
1 mA
0.3 m
Ω
+0.000%
of reading
±0.001
Ω
±0.04%
of reading
0.2 m
Ω
/°C +15 PPM
of reading/°C
1 m
Ω
0 – 750
Ω
100 µA
3 m
Ω
+0.001%
of reading
±0.01
Ω
±0.04%
of reading
2.0 m
Ω
/°C +15 PPM
of reading/°C
10 m
Ω
0 – 7.5 k
Ω
10 µA
20 m
Ω
+0.001%
of reading
±0.1
Ω
±0.04%
of reading
20 m
Ω
/°C +15 PPM
of reading/°C
100 m
Ω
0 – 75 k
Ω
1 µA
0.15
Ω
+0.003%
of reading
±1.0
Ω
±0.04%
of reading
200 m
Ω
/°C +15 PPM
of reading/°C
1
Ω
PTC-RTD
*
0 – 250
Ω
1 mA
2 m
Ω
±0.004
Ω
±0.01%
of reading
0.2 m
Ω
/°C +5 PPM
of reading/°C
10 m
Ω
0 – 500
Ω
1 mA
2 m
Ω
±0.004
Ω
±0.01%
of reading
0.2 m
Ω
/°C +5 PPM
of reading/°C
10 m
Ω
0 – 1000
Ω
1 mA
20 m
Ω
±0.04
Ω
±0.02%
of reading
2.0 m
Ω
/°C +5 PPM
of reading/°C
100 m
Ω
Diode
0 – 2.5 V
10 µA ±0.05%
10 µV
±80 µV ±0.005%
of reading
10 µV/°C +5 PPM
of reading/°C
100 µV
0 – 7.5 V
10 µA ±0.05%
20 µV
±80 µV ±0.005%
of reading
20 µV/°C +5 PPM
of reading/°C
100 µV
Thermocouple
±25 mV
Not applicable
0.4 µV
±1 µV ±0.05%
of reading
0.2 µV/°C +15 PPM
of reading/°C
1 µV
±50 mV
Not applicable
0.4 µV
±1 µV ±0.05%
of reading
0.4 µV/°C +15 PPM
of reading/°C
1 µV
*
Current reversal eliminates thermal EMF voltage errors for resistor sensors.
Thermometry
Number of Inputs:
2
Input Configuration:
Each input is factory configured as either Diode/RTD or Thermocouple
Diode/RTD
Thermocouple
Measurement Type
Four-lead differential with current reversal
Two lead, room temperature compensated
Excitation
Constant current
Not Applicable
Supported Sensors
Diodes: Silicon, GaAlAs, RTDs: 100
Ω
Platinum, 1000
Ω
Platinum, Germanium,
Carbon Glass, Cernox, ROX, Thermox
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, AuFe0.07% vs. Ch,
AuFe0.03% vs. Ch
Input Connector
6 pin DIN
Ceramic isothermal block
Isolation:
Sensor inputs optically isolated from other circuits but not each other
A/D Resolution:
24 bit
Input Accuracy:
Sensor dependent – Refer to Table 1-3
Measurement Resolution: Sensor dependent – Refer to Table 1-3
Maximum Update Rate:
10 readings per second on each input with the following exceptions:
5 readings per second when configured as NTC RTD 75 k
Ω
with reversal on.
5 readings per second on input A when configured as thermocouple.
Auto Range:
Auto Range available to automatically select appropriate NTC RTD range.
User Curves:
Room for twenty 200-point CalCurves or user curves
SoftCal:
Improves accuracy of DT-470 Diode to ±0.25 K from 30 to 375 K. Improves accuracy of
Platinum RTDs to ±0.25 K from 70 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
1-8
Introduction
