Ohaus Corporation www.ohaus.com
12
Defender
™ Series Bases Service Manual
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 base.
3.1.1 Preventive Maintenance Checklist
The scale 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. Picture shown below is the S Base.
1. Disconnect the Base from the Indicator.
2. Remove the Load Cell Mounting Bolts and washers that secure the Bottom Frame to the Load Cell.
