Preparing For Calibration; Mechanical Height Adaptation; Fault Finding Hints; Visual Check - Sartorius PR 6201 Installationshandbuch

Installation Manual
6

Preparing for Calibration

Note: For calibration of the measuring system, please refer to the manual of the weighing
instrument.
Caution!
A warming-up time of at least 30 minutes for the load cell is required before calibration
of the weighing installation.
6.1

Mechanical Height Adaptation

Before starting calibration it has to be ensured that the load cells are equally loaded. Therefore a height
adaptation has to be performed.
•
Place the dead load (e.g. empty hopper) on the load cells.
•
Energize the load cells by means of a stabilized voltage of e.g. 12 V DC.
•
Measure the output voltage of each individual load cell by means of a high-accuracy digital voltmeter and
compare the individual values.
The load cell output with the lowest voltage must be increased by putting shims between mounting plate and
weighing construction.
•
Lift weighing facility near the load cell.
•
Put a thin, deburred sheet of metal (0.5 mm to 2 mm thick) between the upper mounting plate and
weighing construction.
•
Measure the output voltage of the load cells again and correct the height of this load cell or another
one.
7

Fault finding hints

The following hints will enable a technician for a first diagnostic or help in case of wrong or not
reproducible weighing results after commissioning and calibration.
7.1

Visual check

Weighing facility
Junction box
Connecting cable
Mounting kit
Load cell
Sartorius
Are all pipes, hoses, and cables connected as flexibly as possible?
Are devices which are rigidly connected to the weighing facility in direct
contact with the surrounding installation?
Is there friction between the weighing facility and its surrounding (e.g. dirty
apertures etc.)?
Has moisture penetrated the junction box?
Do the screw connections show a good contact?
Is the sheath damaged?
Has moisture penetrated the cable end?
Is there a contact between lift-off protection and the weighing facility
itself?
Are the constrainers stuck?
Does the load cell stand vertically?
Is the housing damaged?
Is the sheath of the cable damaged?
Has moisture penetrated the cable end?
Compression Load Cell PR 6201
EN-21