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Description
Overview
Essential details：PFCL201CE 50kN Pressductor® Strip Tension Measuring System
This manual describes the load cells PFCL 201C/201CE/201CD in a Pressductor® Strip Tension Measuring System.
The purpose of this manual is to describe the general function and design of the load cells and also to be a guidance at installation, commissioning, preventive maintenance and fault tracing.
The load cells are installed under the roll bearings, where they measure forces at right angles to the mounting surface.
The reactive force from the strip, which is proportional to the strip tension, is transferred to the load cells via the roll and the bearings.
The load cells are connected to the control unit via a junction box. The control unit converts the load cell signals to DC voltages that are proportional to the reaction force. Depending on which control unit is chosen, it is possible to have the analog signals for the two individual load cells (A and B), the sum of the load cell signals (A+B), and/or the difference between the load cell signals (A-B).
The load cell only measures force in the direction FR. The measurement force may be positive or negative. The load cell is normally installed under the roll bearings. When there is a strip in tension over the roll, the tension (T) gives rise to two force components, one in the direction of measurement of the load cell (FR) and one at right angles (FV ).
The measuring force depends on the relationship between the tension (T) and the wrap angle formed by the strip around the measuring roll.
PFCL201CE
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PFCL201CE 50kN Pressductor® Strip Tension Measuring System
The load cell is machined from a single piece of stainless steel. The sensors are machined directly in the piece of steel and are positioned so that they are sensitive to force in the direction of measurement and insensitive in other directions.
The load cell is mounted on a base with four screws, and the bearing housing is mounted on top of the load cell with four screws.
Every load cell comes calibrated and temperature compensated.
The load cells PFCL 201C/201CE/201CD are available in four measurement ranges, all variants have the same external dimensions.
The load cell PFCL 201C is equipped with a connector for the pluggable connection cable.
The load cell PFCL 201CE has a fiWed connection cable with protective hose.
The load cell PFCL 201CD is provided with an acid-proof cable gland with a fiWed PTFE- insulated connection cable.
Repeatability error
Repeatability error is defined as the maximum deviation between repeated readings under identical conditions. It is expressed as a percentage of the sensitivity at nominal load.
Compensated temperature range
The temperature drifts of the load cell have been compensated for in certain temperature ranges. That is the temperature range within which the specHfied permitted temperature drifts (i.e. zero point and sensitivity drifts) of the load cell are maintained.
Working temperature range
Working temperature range is the temperature range within which the load cell can operate within a specHfied accuracy. The maximum permitted temperature drifts (i.e. zero point and sensitivity drifts) of the load cell are not necessarily maintained in the whole working temperature range.
Storage temperature range
Storage temperature range is the temperature range within which the load cell can be stored.
Zero point drift with temperature
Zero point drift is defined as the signal change with temperature, related to the sensitivity, when there is zero load on the load cell.
Sensitivity drift with temperature
Sensitivity drift is defined as the signal change with temperature at nominal load, related to the sensitivity, excluding the zero point drift.
