Flintec KAEX-4 User Manual

Page 4

Figure 2: Wiring

ORNER

ORRECTION AT

CALES WITH

LINTEC

OAD

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

Example 2: 400

Ω load cell

10 kg corner error with 5000 kg test load

10 kg

5000 kg

400

Ω =

0.8

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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