Rice Lake PR6201 Zinc-Plated Steel Star Mount Kits - Manual (Page 23)

Installation Manual Compression Load Cell PR 6201
Sartorius EN-21
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 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.)?
Junction box Has moisture penetrated the junction box?
Do the screw connections show a good contact?
Connecting cable Is the sheath damaged?
Has moisture penetrated the cable end?
Mounting kit Is there a contact between lift-off protection and the weighing facility
itself?
Are the constrainers stuck?
Load cell Does the load cell stand vertically?
Is the housing damaged?
Is the sheath of the cable damaged?
Has moisture penetrated the cable end?