8738-DK25, DK50, DK100High-precision incremental travel sensor

Highly accurate and durable! With an accuracy of up to ±2 µm and diameters of 20 to 25 mm, ideal for precise measuring tasks. Vibration-resistant, dust-protected and with a high protection class up to IP64. Thanks to excellent measuring quality, a high degree of protection and long durability, they can be used for a wide range of applications in industry, research and development.

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Productinformation

Principle	Incremental
Measuring range	0 ... 25 mm 0 ... 50 mm 0 ... 100 mm
Resolution	0,5 µm
Signal output	TTL
Protection class	IP64
Range of operating temperature	0 ... +50 °C
Excitation voltage	5 V ± 5 %
Electrical connection	Shielded cabel end
Return spring	Yes
Specific characteristics	Diameter 20 ... 25 mm Vibration-resistant and dust-protected

8738
DE EN

Magnetic incremental probes offer maximum precision over the entire measuring range. Due to the magnetic operating principle and the robust mechanical design, they are insensitive to contamination and are therefore perfect for use in production.

These sensors are used in many areas of technology (industry, research, development...) due to their very good measurement quality, high degree of protection and long durability.

Areas of application are e.g:

Monitoring slow and fast movements between machine parts
Position measurements and position changes of components and foundations, servo controllers, valve controllers, robot controllers
Growth measurements

The incremental displacement sensors are based on the magnetic principle: composed of a magnetic scale and a multi-column read head that responds to the magnetic flux change, they detect linear displacements with high accuracy and resolution.

The ferromagnetic alloy scale or magnetic tape is magnetised with an alternating magnetic field with a pole pitch of 0.2 mm. A special pick-up head and a laser measuring system guarantee high graduation accuracy. The multi-slit read head generates a signal proportional to the displacement from the magnetised pattern on the scale.

The analogue signal generated by the read head is divided electronically and digitised. Length changes can be measured with a resolution of 1 μm to 0.1 μm.

Sensor holder
DE EN
Sensor Winkelhalterung
DE EN
Probe tips
DE EN

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.