Measurable displacements between 0 ... 25 mm and 0 ... 250 mm
Non-linearity max. ± 0.05 % F.S.
Housing diameter 12.7 mm
Service life: 108 movements
Adjustment speed: up to 10 m/s
Integrated cable 1 m
Special versions: Coupling with ball joints or flange fastening by request
Product data
Model
8709
Principle
Potentiometric
Measuring range
0 … 25 mm 0 … 50 mm 0 … 75 mm 0 … 100 mm 0 … 125 mm 0 … 150 mm 0 … 200 mm 0 … 250 mm
Signal output
Depending on excitation voltage
Protection class
IP60
Range of operating temperature
-30
... +100 °C
Supply voltage
Depending on measuring range
Electrical connection
Integrated, shielded 1 m cable Integrated, shielded 3 m cable Integrated, shielded 5 m cable
Return spring
No
Specific characteristics
Housing diameter 12.7 mm
Service life: 108 movements
Adjustment speed: up to 10 m/s
Special versions: Coupling with ball joints or flange fastening by request
Description
Potentiometric displacement sensors are used for direct, precise measurement of mechanical displacements. The mechanical parts of the measuring equipment must be set-up in such a way that the sliding shaft can move without play or lateral forces.
A special multi-finger slider ensures good contact even when the adjustment speed is high or in the presence of vibration. With its housing diameter of only 12.7 mm, the model 8709 is also suitable for highly compact structures.
The movable fastening clamps allow the user variable options for attaching the sensor without complication.
Optionally available adaptations, such as flange and ball joint versions, extend and complement the range of possible applications.
Typical fields of application include:
Measuring the stroke on riveting machines
Measuring insertion distances
Offset measurements on bearings
Spring travel measurements on axes
Measurements of the movement of hoisting platforms
Length measurements on pipe bending machines
Due to the technology employed in potentiometric displacement sensors, they always operate with a sliding contact system. Special processes are applied to give the resistance tracks low friction, low tendency to stick/slip, resistance to abrasion and long-term stability.
The driving rods are guided in long-life, low-friction sliding bearings with close tolerances; this results in highly precise measurements. Transverse forces reduce the service life and can be avoided by using, for instance, ball joint couplings.
Due to the pump effect, the driving rod has double sliding bearings. All the figures quoted in the data sheet for nonlinearity, service life, reproducibility and temperature coefficient apply to the use of the sensor as a voltage divider with a maximum current of 0.1 µA.
A ball joint coupling (see accessories) at the end of the sliding shaft minimizes axial errors between the sensor and the equipment.
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