Lake Shore Model 331 Temperature Controller User’s Manual
3.4.4 Power
Switch
The power switch is part of the line input assembly on the rear panel of the Model 331 and turns line
power to the instrument On and Off. When the circle is depressed, power is Off. When the line is
depressed, power is On.
3.5
DIODE/RESISTOR SENSOR INPUTS
This paragraph details how to connect diode and resistor sensors to the Model 331 inputs. Refer to
Paragraph 4.4 to configure the inputs. The optional thermocouple input is described in Paragraph 3.6.
3.5.1
Sensor Input Connector and Pinout
The input connectors are 6-pin DIN 45322 sockets. The sensor output pins are defined in Figure 3-3.
Two mating connectors (6-pin DIN plugs) are included in the connector kit shipped with the
instrument. These are common connectors, so additional mating connectors can be purchased
from local electronics suppliers. They can also be ordered from Lake Shore (P/N G-106-233).
NOTE:
Pin 3 should not be used for new installations. However, to match existing Model 330
or Model 340 connector wiring, the definition of Pin 3 may be changed with a jumper.
See Figure 8-7 for jumper location.
To provide compatibility with sensor input connectors that have been wired for either Lake Shore
Model 330 or 340 Temperature Controllers, Jumper 4 (for Input A) and Jumper 7 (for Input B) are
used to select the function of Pin 3 of the connectors. The Model 330 provides a constant 1 mA
sensor excitation current on Pin 3 and 10 µA current on Pin 5. The Model 340 provides both 1 mA
and 10 µA excitation current on Pin 5 and connects Pin 3 to sensor ground reference. If the sensor
being used was wired for use with a Model 330, the jumper should be placed in the 330 position
(factory default). This provides the output current selected via the front panel input setup function on
both Pins 5 and 3. If the sensor was wired for use with a Model 340, the jumper should be placed in
the 340 position. This provides the output current on Pin 5 only and connect Pin 3 to sensor ground
reference.
I+
I
V
V+
!
Pin Symbol
Description
1 I–
–
Current
2 V–
–
Voltage
3
+1 mA – Model 330 Configuration
Shield – Model 340 Configuration
4 V+
+
Voltage
5 I+
+
Current
6 None
Shield
Figure 3-3. Diode/Resistor Input Connector
3-4
Installation
