cell, capacity of the load cell, the excitation voltage and the amount of
mass placed on the load cell. Most load cells have a sensitivity of either
2mv/V or 3mv/V.
The expected change to the output is:
Vout = (2mv/V) * Vext * Mass
capacity of load cell
For example a 2mv/V load cell of 30Kg capacity with 20Kg placed on it.
Vext is 5 volts would give a output of approximately:
Vout = (2mv/V) * Vext * Mass = 2mv/V * 5V * 20Kg = 6.7mv
capacity of load cell
30kg
If the load cell has been damaged the no load voltage will likely be
greater than 3mv or the loaded voltage will be grossly different from the
expected value. Remember the loaded voltage will be offset by the
amount of zero load voltage measured.
The load cell can be tested while it is connected to the A/D converter
circuit board, using the scale power supply for excitation voltage.
9.0 REPLACEMENT
PARTS
AND
ACCESSORIES
If you need to order any spare parts and accessories, contact your
supplier or Adam Equipment. A partial list of such items is as follows-
•
Power Supply Adapter
•
Replacement Battery
•
Stainless Steel Pan
•
In use cover
•
Printer, etc.
•
Leveling Feet
@Adam Equipment Company 2007
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