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5.6. Maintenance, Calibration, Test Procedure & Service
This section contains information and instructions concerning maintenance of the DS-520
Weighing Scale.
Preventive maintenance consists of periodically cleaning the external surfaces of the instrument
and should be performed as often as operating conditions warrant.
The calibration procedure is designed to be an aid in maintaining the scale accuracy within
specifications. The calibration procedure may also serve as a performance test procedure.
CAUTION: DO NOT ATTEMPT ANY SERVICE WHILE THE INSTRUMENT IS
CONNECTED TO THE POWER SOURCE.
5.6.1. Maintenance Procedures
5.6.1.1. EXTERIOR MAINTENANCE
The exterior surfaces of the counting scale can be easily cleaned using soap and water.
For grease or other difficult spots, a chlorothane or naptha based cleaner may be used.
5.6.1.2. Internal Maintenance
Internal maintenance is not normally required and if it is, should not be attempted except
by a qualified, authorized service technician.
5.6.2. Calibration
The following procedure should be followed periodically (every six to twelve months is
suggested) to determine that the scale is functioning in all modes.
A.
Electrical
Follow section 4.0 through all its steps
B.
Accuracy
Weighing: The scale weighing accuracy can be determined by applying various known
weights to the platform. Because of the scale's very high accuracy, only weights that are
certifiably more accurate than the scale's specifications should be used in testing for
accuracy. (NIST class "F" or higher)
Since the scale owner does not normally have such certifiable weights available, it is suggested
that the customer call their authorized DIGI dealer.
5.6.3. Service & Repair
No service or repair should be attempted except by qualified personnel, and not until it has
been positively determined that the weighing scale requires such service. All service
should be done in a clean, dry, dust-proof area.
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