Ohaus DEFENDER D500M MECHANICAL BENCH SCALE Manual - Manual (Page 10)

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MODEL D500M PORTABLE BEAM SCALE ASSEMBLY MANUAL AND OPERATING INSTRUCTIONS
B. INCREASING SCALE CAPACITY
The beam on the D500M provides weight indication up to 100 lb (50 kilograms) and is graduated by 8 ounces (200 grams).
The beam will counter balance a maximum load of 100 lb ( or 50 kilograms). To increase the capacity of the scale, simply
place one or more of the additional counterpoise weights on the load box assembly. (For example, the avoirdupois
D500M includes counterpoise weights, which are (2) 100 lb, (1) 200 lb, and (1) 500 lb). The additional counterpoise
weights are stored in a rack attached to the column cap. Each weight is "notched" to fit the load box assembly.
Counterpoise weights may be used separately or in combination. When using one more of the additional counterpoise
weights to determine weight on the platform, adjust the beam poise until a balance state is achieved. The weight on the
platform can be determined by adding the sum of the additional counterpoise weights on the load box assembly to the
amount indicated on the beam.
Example: both additional 100 lb counterpoise weights are secured to the load box assembly. The beam poise is indicating
"45 lb", and beam is balance in the trig loop; weight on the scale platform totals 245 lb.
C. FILLING OPERATIONS
When filling containers on the scale, adjust the beam poise to the desired target weight. Add additional counterpoise
weights to the load box assembly if necessary.
A set screw is provided on the bottom of the beam poise to secure to the beam. To inhibit the beam poise from traveling
on the beam (and changing the target weight), It is advisable to tighten the set screw. Fill container until the beam exhibits
a balance condition indicating that the target weight has been achieved.
D. TRIG LOCKING MECHANISM
When moving the scale, it is recommended that the beam be locked in place to prevent damage. A locking mechanism
is provided on the trig loop to inhibit vertical travel of the beam whenever the base is moved. The trig loop locking device
must be disengaged when the scale is in use.