8710, 8711Potentiometric displacement sensors
Universal and durable! Ideal for the direct and precise measurement of mechanical displacements with lateral force-free articulation. A special multi-finger wiper ensures reliable contact, even at high adjustment speeds and vibrations - for maximum measurement reliability and long durability.
Productinformation
| Principle |
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| Measuring range |
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| Signal output |
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| Protection class |
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| Range of operating temperature |
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| Supply voltage |
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| Electrical connection | 8710
8711
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| Return spring |
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| Specific characteristics |
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Displacement sensors models 8710 and 8711 with a resistance track made of conductive plastic are designed for direct and accurate measurement of mechanical displacements. A special ball joint coupling can be fitted to both ends of the push rod. This allows the sensor to be actuated without clearance or lateral force, even with angular and parallel displacement between the sensor and the measuring device.
A special multi-finger wiper ensures good contact even at high adjustment speeds and with vibration.
Areas of application are
- Electromagnets
- Switch and button travel
- Pneumatic cylinders
- Press-fits (longitudinal press-fits)
- Hydraulic cylinders
- Deformations - deflections
- Length tolerances
- Feed paths
Due to their technology, potentiometric displacement sensors always work with a slider system. The resistance tracks are trimmed in special processes for low friction, low stick-slip tendency, abrasion resistance and long-term constancy.
The push rods are guided in durable, low-friction and close-tolerance plain bearings; this ensures high accuracy. Lateral forces reduce the long durability and can be avoided, for example, by using the ball joint coupling included in the delivery programme. The push rod has double plain bearings to prevent pumping effects.
Installation
The sensor is mounted with 4 brackets, inserted in the left and right longitudinal grooves.
The grooves (W= 2.2 mm; D= 1.6 mm) are not continuous on the side of the electrical connection.
- High accuracy
- Rapid measuring value collection
- Configuration via PROFIBUS
TASK
On a completely automated test bed motor vehicle seats should be checked for their encumbrance. The following features should be tested and recorded:
- Adjusting angle of the back
- Torque required for turning handle
- Total weight of the seat (with and without dummy)
- End position determination
In order to be able to make a well defined statement about the categorization of the motor vehicle seat, the measurement data must be recorded and networked and deposited together as test result on the PROFIBUS level.
SPECIFIC REQUIREMENT
All test data should be transferred at the same time for storage, in order to obtain relevant samples of information for comparative logging of this test. A tare function is a consideration for mounted sensors addressing the issue concerning initial load (dummy load).
SOLUTION
For the recording of all mechanical values following sensors are used:
- Adjusting angle of the back → angular displacement sensor model 8820
- Torque of the turning handle → torque sensor model 8661
- Total weight of the seat → 2 load cells model 8526
- End position determination → displacement sensor model 8719
All sensor signals are recorded by 4 individual Sensor Profibus Modules 9221. Concomitantly the modules display the sensors with voltage and evaluate their signals. The transferring of measurement data takes place in parallel via PROFIBUS. The tare activation concerning a possible initial load, which can be modelled as a dummy, takes place directly via simple PLC unit communication, over PROFIBUS.
Branchen
- High-speed switching outputs
- Mathematical function
- High sampling rate
- Measured values can be transferred via PROFIBUS, RS232, USB or analog output
TASK
The flatness of a workpiece needs to be measured. To do this, measurements must be taken at three points to determine whether the workpiece is within tolerance. The results from these measurement points are compared using an electronic analysis unit. If the workpiece surface is found to be out of tolerance, the unit must immediately indicate the point at which the maxima have been exceeded. In addition, a visual display is required to make it easier to identify such workpieces.
SPECIFIC REQUIREMENT
High sampling rate, high-speed switching of limits.
SOLUTION
burster displacement transducers are used at the three measurement points. All displacement transducers from the burster range are suitable for use here. A SENSORMASTER 9163, with two main inputs, performs the analysis. The unit uses the two mathematical functions "Fin.A" and "Fin.B" to determine the mean values. To do this, the user assigns each of the inputs and the function "Fin.B" to a limit switch. These switches are configured as a direct-switching, symmetric alarm with hysteresis for minimum and maximum values. The process-value display can be configured to show a change in display colour as soon as one of the limit switches is active. In this case, the limit indicators show which measurement value is out of tolerance. Using the RS232 option with the 9163-P100 measurement data software, a PC can be employed to log and archive the measurements. This process can be automated by the controller communication tool included in the software.
Branchen
Extras
Calibrate
Customised and tailored to the diverse requirements placed on quality systems in your industry.
Compensation
We ensure that the output signal corresponds to its specified value in the unloaded state and at nominal load.
Implementation
We support you with on-site implementation so that you can start production quickly and reliably.
MySensor / OEM sensors
The customised solution when no standard sensor meets your requirements. The exclusive solution - just for you.
