Sewhacnm SI 4100 - Weighing System Planning; Formula for Precise Weighing System

Digital Weighing Indicator
SI 4100
- 13 -
4-2-3. Formula to plan the precise weighing system
This “SI 4100” weighing controller’s Max input sensitivity is 0.2㎶ / Digit.
And for precise weighing system, the following formula must be satisfied.
Caution : “Input sensitivity” means Min. output voltage variation of weighing part to change 1digit.
So, please do not make large input voltage to make reliable weighing system.
Single Load cell use
EⅹBⅹD
A : Load cell capacity(kg)
B : Load cell Voltage(mV)
D : Digit
E : affirmation Voltage of Load cell
N : Number of Load cell
0.2㎶ ≤
A
Plural Load cells use
EⅹBⅹD
0.2㎶ ≤
AⅹN
Example1.)
Number of Load cell : 1pcs
Load cell capacity : 500kg
Load cell Related output : 2mV/V
Division : 0.05kg
Affirmation Voltage of Load cell : 5,000mV
Max Capacity of Weighing System : 300kg
Then, estimation result for this weighing system with formula,
5000ⅹ2ⅹ0.05
= 1 ≥ 0.2㎶
The calculated value is larger than 0.2㎶,
so this system has no problem.
500
Example2.)
Number of Load cell : 4pcs
Load cell capacity : 500kg
Load cell Voltage : 2mV/V
Digit : 0.10kg
Affirmation Voltage of Load cell : 5,000mV
Max Capacity of Weighing System : 1,000kg
Then, estimation result for this weighing system with formula,
5000ⅹ2ⅹ0.10
= 0.5 ≥ 0.2㎶
The calculated value is larger than 0.2㎶,
so this system has no problem.
500ⅹ4
※ According to “Resolution” or “Capacity”, it might not be calibrated like calculation.
Cautions
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