Minebea Intec MP 26 User Manual

MP 26 Transmitter Installation and Calibration Manual
Minebea Intec
EN-35
4.6. Example: Calibration by Value
For example, consider a load cell with 150 kg capacity and a sensitivity of 2mV/V. The voltage between V+ and
V- is 10 V. We want to calibrate the system for the 75-kg full-scale capacity plus an unknown dead load.
Assumption:
No load produces 0 mV which is 0%, so enter InL.1 =0 (entry = %), OuL.1 =0 (display = kg)
A full load produces 20 mV 10 V, i.e. 150 kg corresponds to 20 mV which is 100%.
output signal =
power supply *
sensitivity of load cell
(@ max. capacity)
20 mV =
10 V *
2 mV/V
(@ 150 kg)
100 %
Solution:
We want the system to be calibrated for 75 kg.
The first step is to determine the Pspan [%] assuming no dead load is present in the system:
Set InL.1 =0, OuL.1 =0.
Pspan [%] = (full scale * 100) / (total capacity of load cell).
Pspan [%] = (75 *100) /150 produces Pspan = 50
Enter InH.1 = 50 (entry = %) and OuH.1 = 75 (display = kg)
Save the data to the device (Press
to move to end).
Now, the device shows the dead load as a weight value as xxxx kg.
If the device shows 30 kg, dead load = xxxx = 30.
The second step is to adjust the dead load and calibration point
Pdead [%] = (dead load * 100) / (max. capacity of load cell).
Pdead [%] = (30 * 100)/150 = 20
Set InL.1 =Pdead =20 (entry = %);
OuL.1 =dead Load= 0 (display = kg);
InH.1 = 50+Pdead = 70 (entry = %);
OuH.1 = 75 (display = kg)
Save the data to the device (Press
to move to end).
Now the device has adjusted its dead load and the display shows Zero.

Minebea Intec MP 26 Specifications

General

Brand	Minebea Intec
Model	MP 26
Category	Transmitter
Language	English