QGPR 104 and QGPR 102 load cells are mainly used in applications where the load to be measured or the available space in the installation is smaller than what is suitable or required for the smallest PFVL141R load cell. Examples of such installations are tube mills and smaller edger mills.

Standard sizes and cable lengths

Load cells are manufactured in the standard range as below. Dimensions can be designed to order on request.

Select as follows:

• Determine the load for which the load cell is to be used and choose from the table the next higher value in the standard range. We can customize load cells if a standard load cell is not suitable for a particular application.

• To calculate the load F for non-standard load cells:

F = ( D3 2 π 4 – D2 2 π 4 ) × 0.0001 MN.

Load cells Data and definitions

Nominal load (Fnom) is the load for which the load cell is dimensioned and calibrated, i.e. the sum of the stationary load and the maximum measured load in the measuring direction.

Accuracy class is defined as the maximum deviation and is expressed as a percentage of the sensitivity at nominal load. This includes linearity deviation, hysteresis and repeatability error.

Linearity deviation is the maximum deviation from a straight line drawn between the output values of zero and nominal load, related to the nominal load

Hysteresis is the maximum deviation of the output signal at the same load during a cycle from zero to nominal load and back to zero, related to the sensitivity at nominal load. The hysteresis is proportional to the cycle.

Repeatability error is defined as the maximum deviation between repeated readings under identical conditions

It is expressed as a percentage of the sensitivity at a nominal load.

Compression is the total reduction in the height of the load cell when the load is increased from zero to nominal load.

Zero point drift is defined as the drift in the output signal when there is no load on the load cell.

Sensitivity drift is defined as the drift in the output signal at nominal load, excluding the zero point drift.

Control unit Millmate Controller 400

The control unit supplies the load cells with power, processes the signals from the load cells and communicates the result to other systems. Communication can take place via digital inputs/outputs, analog inputs/outputs, TCP/ IP-communication, RS-232 and as an option, via high-speed fieldbus.

The control unit can be manually operated using the Millmate Operator Unit 410 and by external units via a serial interface or digital/analog inputs. Setup and commissioning are easy following step-by-step menus.

Measured values are displayed on the operator unit, connected to analog outputs or transmitted via a serial interface to an external display or to other external units.

Features

The Millmate Controller 400 has been designed to offer a lot of functionalities and at the same time very easy to use.

The control unit covers most mechanical arrangements. This means the user only has to follow the step-by-step menus in order to set up the control unit and to obtain correct roll force measurement.

Some examples of the built-in functionalities:

• Predefined standard measurement modes

• Built-in load cell tables

• Filter times from 1 up to 2000 ms

• Easy configurable analog/digital inputs/outputs

• Level detectors

• Unit selection (N, kN, MN, kp, t, lb, T)

• Self-diagnostics test system including transducer test

• Simulation mode for easy check of system

integration

Millmate Controller 400

Version Number of load cells Communication

PFVA 401 2 PFVL141 VIP

PFVA 401 S 4 PFVL141 VIP

PFVA 401 F 2 PFVL141 VIP + Profibus

PFVA 401 SF 4 PFVL141 VIP + Profibus

PFXA 401 2 QGPR 104/102 VIP

PFXA 401 S 4 QGPR 104/102 VIP

PFXA 401 F 2 QGPR 104/102 VIP + Profibus

PFXA 401 SF 4 QGPR 104/102 VIP + Profibus
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