Rice Lake FC-i/Si Series, A&D Weighing - Manual (Page 72)

Specifications for Remote Scale
The scale has the ability of driving up to 4 load cells (350 :) in a remote scale
(platform). Set for the capacity range 0.5kg to 5,000kg (1 lb to 10,000 lb).
‰ The scale has the ability of driving up to 4 load cells (350:) in a remote scale
(platform).
‰ Capacity range for the remote scale is 0.5kg to 5,000kg (1 lb to 10,000 lb).
‰ Minimum output at zero point is 1mV.
‰ Maximum output at full load is 14mV.
Excitation Voltage of the scale is 5V.
‰ Cable length should be kept under 5m (16.5 ft.) for higher accuracy.
‰ Pin connection (JM:NJC-207-PF):
The Load Cell and Input Sensitivity
The relationship between load cell and input sensitivity (X) for the scale is follows:
‰ Example Load Cell Capacity 100kg “A”
Rated Output 3mV/V “B”
Min., Division of Display 0.01kg “D”
5,000 x x B D
A
“X”= µV
‰ When a single Load Cell is used,
the following formula should apply:
‰ System design will be satisfactory if “X” is
greater than 0.5µV. In the example above
“X” = 1.5µV.
Capacity and Resolution
‰ The resolution of the remote scale is automatically determined during the calibration
procedure. The following is to enable you to calculate the resolution for a given capacity.
1. Decide the capacity value and assign it to “Ws”. Maximum 5 digits.
2. Get the maximum count “Ns” for the capacity. Ignore the decimal point and add “0”
to Ws until it is 5 digits.
3. Calculate: d’=Ns/10,000.
4. Decide the minimum division “d”.
d’=1 Æ d=1
2 t d’>1 Æ d=2
5 t d’>2 Æ d=5
d’>5 Æ d=10 This should be changed to d=1, dividing Ns by 10.
5. Now “Ns x d” and the resolution 1/No = d/Ns can be determined.