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LakeShore 331S Temperature Controller

Refer to the LakeShore Model 331 User’s Manual for detailed information about LakeShore 331S Temperature Controller configuration and operation.

Line Voltage

CAUTION: Verify that the AC Line Voltage shown in the fuse holder window is appropriate for the intended AC power input. Remove and verify the proper fuse is installed before plugging in and turning on the instrument.

Always turn off the instrument before making any rear panel connections. This is especially critical when making sensor to instrument connections.

The LakeShore Model 331 has four different AC line voltages configurations so that it can be operated from line power anywhere in the world. The nominal voltage and voltage range of each configuration is shown in Table 1.

Nominal

Minimum

Maximum

100 V

90 V

106 V

120 V

108 V

127 V

220 V

198 V

233 V

240 V

216 V

254 V

Table 1: LakeShore 331 Input Voltage Ranges

Verify that the AC line voltage indicator in the fuse drawer window shows the appropriate AC line voltage before turning the instrument on. The instrument may be damaged if it is turned on with the wrong voltage selected.

Caution/Attention/Vorsicht: To avoid potentially lethal shocks, turn off controller and disconnect it from AC power before performing these procedures.


  1. Identify the line input assembly on the instrument rear panel (see Figure 1).
  2. Turn the line power switch Off.
  3. Remove the power cord.
  4. Release the drawer holding the line voltage selector and fuse with a small screwdriver.
  5. Slide out the removable plastic fuse holder from the drawer.
  6. Rotate the fuse holder until the proper voltage indicator shows through the window.
  7. Verify the proper fuse value.
  8. Re-assemble the line input assembly in the reverse order.
  9. Verify the voltage indicator in the window of the line input assembly.
  10. Connect the power cord.
  11. Turn the line power switch On.

Figure 1: LakeShore 331 rear panel

LakeShore 331S Operation Procedures

Advanced Operations:

 

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