Junction Box Type KEK-4 Technical Manual Rev. 2.0.0 December 2022 Seite/ Page 12/12
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.
The 0 Ohm jumpers instead of the correction resistors must be in place (shipment status).
2.
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.
3.
The corner with the lowest display value is the starting point for the corner correction. The
4.
Calculate the correction resistance as follows:
Correction resistance [
Ohm
] =
Deviation in [kg]
x Input resistance of the load cell [
Ohm
] *
Test load in [kg]
* 1000
Ohm
output resistance for:
BK2, SB4, SB5, SB6, SB14, SLB, ZLB, UB1, UB5, UB6, PB, RC3
350
Ohm
output resistance for:
SB8, RC1, SB2
Example 1: 1000
Ohm
load cell
0.1 kg corner error with 500 kg test load
0.1 kg
x
1000
Ohm
=
0.2
Ohm
500 kg
Example 2: 350
Ohm
load cell
10 kg corner error with 5000 kg test load
10 kg
x
350
Ohm
=
0.7
Ohm
5000 kg
5.
Install the correction resistor into the junction box instead of the 0 Ohm jumper for the corresponding
load cell excitation.
6.
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
Ohm
to 4.7
Ohm
(10 pcs. for each value; article no. 5200-030).
C
LOSING THE CABLE BOX
In the junction box there is also a drying tablet in a plastic bag. Please remove the plastic bag and leave the
drying tablet in the junction box to absorb any moisture that may form. Then check the cover seal for dirt or
possible damage and tighten the cover screws
First tighten the lid screws evenly crosswise until the lid is in contact evenly everywhere.
Then tighten the screws crosswise with approx. 1Nm until all screws are tightened equally.
