OHAUS Defender D30BR, Service Manual

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CHAPTER 3 MAINTENANCE AND REPAIR PROCEDURES
3.1 PREVENTIVE MAINTENANCE
Ohaus Bases should be carefully handled, stored in a clean, dry area, and cleaned periodically.
Follow these precautionary steps:
– When a base has had chemicals or liquids spilled on it, all exterior surfaces should be
cleaned as soon as possible with warm water on a damp cloth.
– Do not leave a mass on the base when it is not in use.
– Allow time for the base to stabilize after moving it from an area which is at a different
temperature than the area where it is to be operated. Allow one hour for each 5°F
(2.7°C) temperature change before using the scale.
3.1.1 Preventive Maintenance Checklist
The base should be inspected and checked regularly, as follows:
1. Clean the base.
2. Remove the Platform to inspect and clean the area beneath the Platform.
CAUTION
DO NOT USE CHEMICAL CLEANERS OR SOLVENTS OF ANY TYPE.
SOME CLEANERS ARE ABRASIVE AND MAY AFFECT THE BASE’S FINISH.
3. Check the Load Cell cable for broken or damaged insulation.
4. Make a visual inspection as detailed in Chapter 2.
3.2 Replacing the Load Cell
A Load Cell that is even slightly bent or corroded should be replaced. The Load Cell may also
need to be replaced because of instability, or because the scale does not calibrate or repeat, or
because it is physically broken.
1. Remove the scale Platform and
disconnect the Base from the Indicator.
2. Remove the four Load Cell Mounting
Bolts and washers that secure the Top
Frame to the Load Cell.
3. Set the Top Frame and the Load Cell
Spacer aside.
Figure 3-1. Four Mounting Bolts that secure
the Top Frame to the Load Cell.
Defender™ B & V Series Service Manual 3-1 Ohaus Corporation www.ohaus.com