GEMCO | Linear Displacement Transducers

GEMCO | Linear Displacement Transducers

GEMCO specialises in exceptionally robust linear and rotary position sensors, PLC & network interface technologies, press automation, programmable limit switches, industrial brakes, and more. Gemco is ideal for applications where high accuracy, high speed and high reliability, in harsh environments, is crucial.

Shock & Vibration #1 Cause of Equipment Failure

The Gemco range of Linear Displacement Transducers (LDT) uses advanced Magnetostrictive technology to solve complex linear positioning applications.

Extreme conditions affect equipment reliability, and ultimately the efficiency and productivity of operations. Engineered to perform and built to last, Gemco linear displacement technologies will meet and exceed your process and positioning needs.

Gemco LDT’s are robust, designed to operate in harsh environments, under high vibration and shock levels, and in extreme temperatures.

Patented technology enables GEMCO products to out-last competitive products anywhere that precise, absolute linear position feedback is required:

  • Steel mills
  • Timber mills
  • Saw mill equipment
  • Water and wastewater
  • Mining and port operations
  • Stamping presses
  • Hydraulics
  • Packaging & automated assembly machinery
  • Dispensing equipment


With the right technology, significant gains are possible in productivity, greater precision and reductions in operational and maintenance costs. As the Australian partner, we have access to the entire Gemco range of solutions:

Read about Gemco in action, in these application spotlights:

GEMCO VMAX: High Resolution & Precision Repeatability

The Gemco 953 VMAX was developed to meet the most demanding processing challenges, regardless of application or operating environment. The highly versatile VMAX offers absolute accuracy and reliability, with high resolution and precision repeatability.

The VMAX is rugged and durable, resistant to contaminants and environmental conditions. The unit’s sleek housing offers unlimited flexibility, is easy to install and set up. It features the latest generation of Magnetostrictive position-sensing technology with automatic gain circuitry and factory calibrated zero point.

  • Shock resistant to 1000Gs (lab tested)
  • Vibration resistant to 30Gs (lab tested)
  • Analogue outputs, 0-10 VDC, +/-10 VDC, 0-5 VDC, +/-5 VDC, 4-20mA
  • Digital outputs, start/stop, control pulse & variable pulse (PWM)
  • SSI (Synchronous Serial Interface) 24, 25, or 26 Bit, Binary or Gray Code, Synchronous or Asynchronous Mode
  • Removable cartridge for hydraulic applications
  • IP68 rating
  • Sensor length up to 300" (7.6m)
  • Wide input power range 7 to 30 VDC
  • Programmable zero and span
  • Diagnostic Tri-Colour LED

> View the GEMCO 953 VMAX Brochure

GEMCO eBrik II: A Purely Electronic Position Solution

The Gemco 955 eBrik II is an accurate, programmable zero and span, auto-tuning, non-contact linear position sensor in an economical, low-profile package. It’s versatile enough for many applications, field programmable, and the perfect replacement for old-style potentiometers.

The eBri II utilises Magnetostrictive technology to provide absolute position, repeatable to .001% of the sensing distance. There’s no contact, no moving parts, nothing to wear out. The eBrik II is a cost effective linear sensing solution.

  • Low Profile LDT
  • Non-contact technology
  • Absolute analogue feedback
  • Programmable zero & span points
  • Industry standard matting cord-set
  • Floating or slide magnet option
  • Analogue output 4-20mA, 0-10 VDC
  • Sensor length up to 74” (1.8m)

> View the GEMCO 955 eBrik II Brochure

Gemco Magnetostrictive Technology

In a Gemco position sensor, a current pulse is sent down a magnetostrictive wire, through a specially designed waveguide (Figure A). The interaction of this current pulse, with the magnetic field created by the movable magnet assembly, produces a torsional strain pulse on the wire, which travels at sonic speed along the wire (Figure B).

The strain pulse traveling up the wire is sensed by a small induction pickup coil in the head assembly of the LDT. The position of the movable magnet is determined with high precision by measuring the time between the launching of the current pulse and the arrival of the torsional strain pulse. The result is highly accurate, non-contact position sensing, with absolutely no wear on the sensing element.

• Hysteresis

The difference in indicated position when the same point is reached from two different directions.

• Repeatability

The deviation in indicated position when a point along a stroke length is approached repeatedly from the same direction.

• Magnetostriction

A magnetic field produces a small change in the physical dimensions of ferromagnetic materials on the order of several parts per million in carbon steel and, conversely, a physical deformation or strain (or stress which causes strain) produces a change of magnetisation in the material.

• Non-Linearity

The degree that the indicated position of the magnet at points along the stroke varies from the actual physical position. Non-linearity of an LDT is expressed in absolute error or as a percentage of the active stroke length.

• Resolution

Resolution is the smallest incremental change in position along the stroke length of the sensor that can be detected and indicated in an output. When using LDTs with analogue output (i.e., voltage or current outputs), the resolution is limited by the amount of power supply-induced output ripple and the sensitivity and/or design capabilities of the receiver electronics. Digital system resolution is defined by a specific value.

• Recirculation

A method used to improve the resolution of a system using digital LDTs. The on-time of the pulse width output is multiplied by a specific factor. This multiplication provides more counting time for the counter in the electronics, thus improving the resolution.