Hengstler HSD25 Incremental Encoders

Hengstler HSD25 Incremental Encoders encoder with up to 19.05 mm shaft diameter will work reliably within a temperature range from -40°C to +100°C. This type of rotary encoder with its hard-anodized housing outlet exceeds the requirements of IP66/IP67 and NEMA 6. By employing a state-of-the-art opto-ASIC, the rotary encoder is resistant to shocks and vibrations.

The HSD25 rotary encoder can easily be installed in conjunction with motors and thus provides reliable feedback signals even in tough ambient conditions. The HSD25 series of rotary encoders also includes intrinsically safe ATEX variants for use in potentially explosive atmospheres.

NorthStar’s HSD25 Harsh-Duty Optical Hub Shaft Encoder accepts up to 0.75″ diameter shafts and operates reliably from -40 to +100°C. The hard anodized finish encoder exceeds IP66/IP67 and NEMA 6 enclosure requirements.

This robust encoder is also available in Stainless Steel to meet NEMA 4x and 6P requirements and its sealed housing allow the Encoder to be operated when regulatory washdown and high-pressure steam or caustic chemicals are required.

Utilization of an advanced Opto ASIC with innovative packaging techniques enables the encoder to operate in high shock and vibration environments. The HSD25 is also available in an Intrinsically Safe version certified to ATEX EEx ia IIB T4 when used with the appropriate IS barrier.

Hengstler HSD25 Incremental Encoders Features

  • Single or Dual output
  • ATEX Certification available for Intrinsically Safe application
  • High-Resolution Unbreakable Disk
  • Industrial Duty Connector NEMA 4X, 6 / IP66, 67 Rated
  • Nickel or Stainless Steel Housing available


The HSD25 Harsh-Duty Optical Encoder features simple installation on motor or machine hub shafts. It is often mounted on the back of motors where encoder feedback is needed in harsh environment applications. Available housing options make it ideal use in corrosive environments that demand heavy washdown protection. ATEX certification is also available for intrinsically safe applications.

  • Converting Machinery
  • Material Handling
  • Packaging Equipment
  • Oil Field Exploration
  • Processing Equipment

Another Article:


Product Family HSD25
Ordering Information Rotary Encoder HSD25
Function / Application Incremental
Technology Optical
Approval CE
Housing Diameter [mm] 58,9 mm
Solid- / Hollow Shaft Hollow 6 … 19 mm
Protection Rating Housing IP67
Operating Temperature [°C] -40 … +100 °C
Housing Option Stainless Steel
Nickel Finish
powder coated alumunium
Increased Environmental Requirements High mechanical robustness
Connection Cable
Revolutions [rpm] 5.000 rpm
Number of Pulses 1 … 3600
Interface Differential Line Driver
Open Collector NPN

Ref: hengstler.de

Download Data Sheet: Incremental Encoders HSD25

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