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TWK-Inductive Linear Transducers

Inductive Linear Transducers for engineering and instrumentation.

The half-bridge technology for 1 to 360 mm stroke. The wide range of inductive linear transducers includes items with 10, 12 and 25 mm outside diameter and for measuring ranges from 1 to 360 mm. The smaller IW 10 and IW 120 series require external electronic modules for excitation and signal conditioning. IW 250 series with 25 mm housings have integral electronics consisting of oscillator, demodulater and amplifier. Analogue output signals are either 0(4) to 20 mA, 0 to 10 VDC or ± 10 VDC for full range or calibrated strokes. The transducers are completely potted to meet protection grades up to IP 68. Electrical connection is made either by leads, plug and socket or through cable glands. Various mechanical configurations are available to suit specific mounting conditions.

The IW 260 displacement transducers operate according to the new principle of fractional inductivity allotment within the hollow coil. Depending on the position of the core the inductivity changes within the corresponding coil section. This kind of layout provides for more position data than the classical half-bridge or LVDT configuration. An integral electronic circuit transforms these data into a signal proportional to the displacement of the plunger core.

The electronic circuit contains an oscillator, a demodulator, an amplifier and in some cases a current output source. Its SMD-design is short-circuit proof and protected against reverse polarity. The sensor system is completely sealed within a non-corrosive steel case to ensure positive protection against vibration, shock, humidity, oil and corrosive matter.

The new principle of fractional inductivity allotment as described above brings about an outstanding increase of the measuring stroke. In comparison to the IW 250 model the useful range of the IW 260 model increases by 70 to 100% based on the same length of the case.

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Opkon-Wire Draw Position Potentiometers & Encoders.

Draw Wire Potentiometer:

● Potentiometric, voltage divider
● Easy mounting
● High protection degree
Main Applications:
Offers easy mounting and quick solution for linear transducers
Hydraulic transducers
Cranes
Medical applications
General automation applications

  • Measurement type Resistive
  • Linearity 0,5%, 0,1% or 0,05%
  • Measurement stroke – 800mm, 1800mm
  • Output signal type Voltage divider
  • Output signal Analogue voltage
  • Supply voltage + 28 VDC max
  • Electrical connection 2.5 meter cable (standard)
  • Working temperature -20°C ….+80°C
  • Case material Plastic, steel
  • Protection Degree IP 64

Draw Wire Encoder:
● Incremental output
● Easy mounting
● High protection degree
Main Applications:
Offers easy mounting and quick solution for linear transducers
Hydraulic presses
Wood working, profile and metal processing machinery
Medical applications
General automation applications

  • Measurement type Optical
  • Resolution 200mm/1000pulse
  • Measurement stroke – 1000mm, 2000mm,3000mm,4000mm
  • Output signal type Totempole, TTL, Linedriver or HLD
  • Output signal A, B, Z or A,A’, B,B’, Z, Z’
  • Supply voltage 8-24 VDC or 5VDC
  • Electrical connection 2.5 meter cable (standard)
  • Working temperature -20°C ….+80°C
  • Case material Plastic, steel
  • Protection Degree IP 64

Opkon Literature …

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Opkon-Angle Sensors

OPKON’s core product has traditionally been Resistive Linear Position Transducers. These position sensors are commonly applied in plastic injection machinery, textile machines, transfer and hydraulic, metal forming machines and general automation applications. In the recent years, OPKON has started production of rotary magnetic encoders and linear magnetic incremental sensors, and Rotary potentiometers for Angle Measurement.

Signal outputs from 0-5vdc  over a rotation angle of 45°, 90°, 180° or 360°, with IP Rating of IP-64.

Models are available in a male shaft version c/w Flexible coupling and Mounting bracket, or a Blind hollow shaft version with flexible tether mount.

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Novotechnik-Transducers for the Heavy-Duty Segment

Rugged, Reliable and, if necessary, also Redundant.

Precision Rotary Transducers for the Heavy-Duty Segment. Automation technology is also used in harsh environmental conditions.

Typical examples can be found in driven machines in road construction and in agriculture and forestry, on moving platforms, in container terminals and in harbour cranes.

The sensors used here must meet special requirements. Sufficient accuracy alone is not enough. A high level of reliability must be ensured even with heavy vibrations, moisture and extreme temperature fluctuations. And the understandable desire for “affordable” technology also plays a role here.

Conductive plastic potentiometers available today in surprisingly rugged designs are therefore usually unbeatable in applications of this kind. With the conductive plastic potentiometers of the IPX 7900 series (picture), Novotechnik has expanded its product line with rugged rotary transducers specially developed for use under extreme environmental conditions, e.g. for mobile applications. A typical application is, for example, actual value detection on the steered axle of electrohydraulic steering systems

The heavy-duty potentiometers are available for detection ranges of 120°, 200° and 350° and offer unrestricted continuous rotation. All variants have either a single-channel or a two-channel, redundant design with two separate connections. As a result, the requirements as per SIL 3 are met in accordance with
IEC 61508.
The angle sensors also meet the requirements of the protection type IP67 (plug variant M12) or IP69k (PG screwed cable gland with cable connection). They are impervious to dust, dirt or moisture. As potentiometers operate according to the Rugged, Reliable and, if necessary, also Redundant Precision Rotary Transducers for the Heavy-Duty Segment
voltage divider principle, temperature fluctuations also have no effect on the measuring accuracy.

Even with heavy vibrations, the expected service life of the rotary sensors is
over 100 million movements. A rugged all-metal housing and a positive-locking cover
protect the conductive plastic resistance tip and the extremely durable multi-finger
wiper. The solid yet compact design with dimensions of 79 x 35 mm² enables direct
attachment to the axle without additional protective measures. The sturdy, one-piece
shaft with dual ball-bearing mounting with a large bearing spacing and a 13 mm diameter
enables direct steering via a strong lever or driver.

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