8739Inductive displacement sensor with IN-LINE measuring amplifier
Ultra-compact and precise! With a diameter of only 8 mm, ideal for installation in the tightest of spaces. Vibration-resistant and wear-free for maximum reliability. Integrated IN-LINE measuring amplifier for direct displacement measurement and indirect acquisition of convertible mechanical variables.
Productinformation
| Principle |
|
| Measuring range |
|
| Signal output |
|
| Protection class |
|
| Range of operating temperature |
|
| Excitation voltage |
|
| Electrical connection |
|
| Return spring |
|
| Options |
|
| Specific characteristics |
|
Inductive displacement sensors in this series can be used to measure linear displacements and indirectly all mechanical variables that can be converted into displacements using additional equipment (e.g. compression and tensile forces, strain, torque, vibrations). The sensor body, which is equipped with a plug connection, has an outer diameter of only 8 mm and is therefore particularly suitable for integration in spatially limited structures.
Typical areas of application are displacement and strain measurements on
- Machines
- Servo systems
- Motor vehicles
- Test benches
- Production plants
The cylindrical stainless steel cabinet contains a differential transformer (LVDT). This consists of a primary and two secondary coils with an axially flexible plunger armature (core). Moving this core changes the magnetic induction of the coils. The IN-LINE carrier frequency amplifier converts the displacement into a directly proportional electrical DC voltage.
The sensor is designed as a probe in which a spring presses the probe tip against the target within the measuring range. A bellows protects the mechanical guide of the probe ball from dirt and splash water.
The IN-LINE amplifier is integrated into the connection cable and specially adjusted to the sensor. Both components form a unit, but can be separated for installation (miniature plug-in connection on the sensor). The use of mismatched components can lead to major measurement deviations. In the version with IN-LINE measuring amplifier, the sensor body is galvanically isolated from the excitation and measurement signal.
Lateral forces lead to a shortened durability.
- Ø 8 mm
- Linearity: 0.25 %
- Zero maintenance LVDT
- Large number of cycles
TASK
If the shaft of an electric motor is not circular, this will produce vibrations at high speeds and hence increased wear. Irregular bearing surfaces may be one cause of a shaft running out of true. A bent shaft or a shaft without strict dimensional tolerances could also be the cause.
SPECIFIC REQUIREMENT
To guarantee the roundness of a shaft, two displacement sensors are used to measure the true running of the shaft. The displacement readings are checked to assess the roundness.
SOLUTION
As part of the quality assurance process, the shaft is tested for true running, bow and concentricity of the bearing surfaces. The test also includes measuring the diameter of the shaft bearings. In the test, the shaft is clamped in a holder and turned by a motor while being measured by two displacement sensors. The instrument measures the difference between the signals from these two sensors; this difference is only allowed to vary within a specified tolerance band. The 9163 digital indicator performs the difference calculation and assesses the results. As this process takes just a few seconds, both random sampling and 100% testing are possible. If the shaft does not lie within the tolerance band, the 9163 outputs an alarm signal. When used for testing random samples, the 9163 colour display provides additional support by changing from green to red if the shaft lies out of tolerance. The operator thus knows immediately whether the shaft is OK.
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.
