Page 122 - scales manual v1014 web

Calculating uV per Graduation

Full scale system output (at 120000 LBS) =120,000 X Mv/V X Excitation/#Cells x Cell Capacity
= Maximum millivolt output for scale capacity

Actual output over 120,000 range =Excitation x maximum Mv output/Scale capacity = uV per
Graduation

Most scale indicators need 1 uV per scale graduation to properly function. The manufacturer
of the indicator should specify a minimum uV per graduation input needed
Example:

Customer has a hopper and they need load cells for it. You understand they need 4 cells and
need to weigh 40,000 LBS of material. The hopper weighs 10,000 LBS. The customer wants
10 LB increments.

The cells you specify are 20,000 LB cells, they have a 3Mv/V output and the excitation voltage
is 10 volts from the indicator.

40000 (Lbs)/.003(Mv/V) X 10 (Volt Ex) = 1200_ = 15 mv maximum system output
divided by 4 cells X 20,000 LB Cell capacity 80,000

Now,
Take 15 mv and convert to microvolts = (15000 uV) multiply this by your excitation voltage (10
Volts) and divide this by scale capacity (40,000 LBS)

15000 uV X 10 Volts = 3.75 uV per Graduation
40000

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