Flintec KAEX-4 User Manual
Page 4
Figure 2: Wiring
C
ORNER
C
ORRECTION AT
S
CALES WITH
F
LINTEC
L
OAD
C
ELLS
Flintec load cells are manufactured with rather tight tolerances, so in most cases an additional corner
correction is not required. The best conditions are achieved if you use load cells of the same class
(Designation is done with capital letters A to I on the load cell package besides the type label).
Hint: Corner errors can have a mechanical background, e.g. sloped mounting surface of the load cell.
Procedure:
1. Get the display value for each corner. Use the highest possible display resolution (e.g. factor 10 or higher)
or, if this is not possible, measure the the digital weight increment using corresponding weights.
2. The corner with the lowest display value is the starting point for the corner correction. The differences of
the other corners are calculated with reference to this “basic corner”.
3. Calculate the correction resistance as follows:
Deviation in [kg]
Correction resistance [
Ω] =
Test load in [kg]
X Input resistance of the load cell [
Ω] *
* 1100
Ω input resistance for:
BK2, SB4, SB5, SB6, SB14, SLB, ZLB, UB1, UB5, UB6, PB, RC3
400
Ω input resistance for:
RC1, SB2
Example 1: 1100
Ω load cell
0.1 kg corner error with 500 kg test load
0.1 kg
500 kg
x 1100
Ω =
0.22
Ω
Example 2: 400
Ω load cell
10 kg corner error with 5000 kg test load
10 kg
5000 kg
x
400
Ω =
0.8
Ω
4. Install the correction resistor into the junction box for the corresponding load cell excitation, e.g. for load
cell no. 1 the +excitation wire has to be changed from terminal no. 7 to terminal no. 3 and afterwards the
correction resistor has to be inserted between terminal no. 3 and terminal no. 7.
5. Check the corners again. If required repeat the procedure.
Hint: 50 ppm resistors for corner correction are available as a set of 14 values from 0.22
Ω to 4.7 Ω (10 pcs.
for each value; article no. 5200-030).
Check the cover sealing and install the cover of the box.
Junction Box Type KAEX – Technical Manual, Rev. 1.01 September 2007
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