4-2. Formula to plan the precise weighing system
This “DN501A” weighing controller’s Max. input sensitivity is
0.45
㎶
/ 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
dE
ⅹ
B
ⅹ
D
A : Load cell capacity(kg)
B : Load cell Voltage(mV)
D : Digit
E : affirmation Voltage of Load cell
N : Number of Load cell
0.45
㎶
A
Plural Load cells use
dE
ⅹ
B
ⅹ
D
0.45
㎶
A
ⅹ
N
Example1.)
Number of Load cell : 1pcs
Load cell capacity : 500kg
Load cell Voltage : 2mV/V
Digit : 0.05kg
Affirmation Voltage of Load cell : 5.0V
Max. Capacity of Weighing System : 300kg
Then, estimation result for this weighing system with formula,
5000
ⅹ
2
ⅹ
0.05
= 1 e 0.45
㎶
The calculated value is larger than 0.45
㎶
,
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 : 5.0V
Max. Capacity of Weighing System : 1,000kg
Then, estimation result for this weighing system with formula,
5000
ⅹ
2
ⅹ
0.10
= 0.5 e 0.45
㎶
The calculated value is larger than
0.45
㎶
, so this system has no problem.
500
ⅹ
4
Cautions
!
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