Checks With Multimeter; Check Zero Output Signal Of Load Cell; Checking The Strain Gauge Bridge Of The Load Cell; Checking The Insulation Impedance Of The Load Cell - Sartorius Contego Manuel D'installation

Installation Manual
7.2

Checks with Multimeter

7.2.1

Check Zero Output Signal of Load Cell

•
Unload load cell.
•
Disconnect the load cell measuring outputs.
•
Check whether the output voltage without load is within the limits.
Type Zero output signal
D1, C3 0 mV ±0.02 mV/V
7.2.2

Checking the Strain Gauge Bridge of the Load Cell

•
Do not exceed the test voltage.
•
Check whether the values of the resistors are within the permissible limits.
Maximum test voltage
Type
D1
C3
7.2.3

Checking the Insulation Impedance of the Load Cell

•
Never apply the test voltage between the cores of the load cell cable (danger of destroying the load
cell).
•
Insulate the load cell cores.
Maximum test voltage
Insulation impedance
7.2.4

Check Insulation Impedance of Connecting Cable

•
Disconnect connecting cable and load cells.
•
Insulate the cores of the connecting cable.
Insulation impedance
Sartorius
Hygienic Weighing Module Contego®
Standard industrial
intrinsically safe version (PR .../...E)
Input impedance
(red core, blue core)
650 Ω ±6 Ω
650 Ω ±6 Ω
Standard industrial
Intrinsically safe version (PR .../...E)
Core - housing
Core - screen
Screen - housing
Core - core
Core - screen
28 V DC
25 V DC
Output impedance
(green core, gray core)
610 Ω ±1 Ω
610 Ω ±0.5 Ω
100 V DC
500 V AC
>5000 MΩ
>5000 MΩ
>5000 MΩ
≥600 MΩ × km
≥600 MΩ × km
EN-25