SL1390 – Internal-Mount Linear Position Sensor – 40″ (1 meter)

A unique linear to rotary to linear coupling allows our LVDT based position sensor to outperform all sensor technologies in harsh or extreme duty environments.

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  • 0"-40" (1 meter) measuring range
  • No core-drilling of rod required
  • Non-contacting Linear Variable Differential Transformer (LVDT) sensor technology
  • Sensor resides completely within the cylinder
  • For use in standard and telescoping cylinders
  • Please consult factory for longer stroke lengths
  • View the SL1390 Data Sheet


SL Series sensors are based on a patented technology that couples the translation of a hydraulic cylinder to a non-contacting sensor element.  With a sensing ranged up to 39″, these sensors are more robust than any other internally mounted sensor available today.  Utilizing an extremely accurate non-contacting core sensor, the SL1390 provides long life without any degradation in performance.  Our SL1390 is unique in that it can be used in not only single-acting piston cylinders, but telescopic cylinders as well. The variable stroke-sensing capability allows a single sensor design to be used for various stroke cylinders.

Mounting the sensor within the cylinder requires some modification of the cylinder as shown in the below image. Download complete installation presentation. 

LVDT linear position sensor installation

The sensor electronics cabling interfaces with our SC451 Signal Conditioner Connector that resides on the outside of the cylinder and comes with an integral 4-conductor cable. We suggest using the SC240 Signal Conditioner with the SC451 for our sensors. However, for customers that prefer not to or cannot use a DIN rail mount device, we can provide a simple 0-5V output signal conditioner within our SC connector. Contact us for more information.

Signal Conditioner

A perfect compliment to our SL products is the SC240 DIN-3 rail mount signal conditioner (by Macro Sensors). This conditioner provides several output options and an easy pushbutton setup.

Data sheet (PDF)

User Manual (PDF)

Download the corresponding CPI drawing SC240 (PDF)