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SECTION 3 – MAINTENANCE
3-4
The limit switch may require periodic adjustment. Use the following procedure to adjust the
limit switch:
Warning: Make sure the instrument power is off before performing this procedure.
1. Remove the cover plate from the limit switch assembly.
2. Bend the arm on the limit switch until the switch closes with an audible "click" as the
brass platen is manually lifted. The switch must close before the brass platen touches the
steel platen.
3. Manually operate the top limit switch and verify that the time delay relay inside the
power unit trips with an audible "click." The delay is set to approximately 20 seconds by
adjusting the knob at the top of the relay.
4. Replace the cover plate.
Calibration
The 4207D uses a Linearization Table to calibrate the load cell. This table can be edited from
the Chandler 5270 software or at the Controller. Refer to procedure 89-0200 (PROC,4207D
LINEARIZATION) for detailed instructions.
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