Hengstler HD 20 Incremental Encoder

Hengstler HD 20 Incremental Encoder HD 20 is a compact unit for high demands that exceed the requirements of IP66/IP67 and NEMA 6. Available with stainless steel housings, these rotary encoders are ideal for tough ambient conditions that require excellent resistance to high-pressure cleaners and corrosive chemicals.

Large-sized bearings are designed to withstand high axial and radial forces up to 440 N. The HD20 series of rotary encoders also includes intrinsically safe ATEX variants for use in potentially explosive atmospheres.

The HD20 Harsh-Duty Optical Encoder is a compact heavy-duty encoder designed to exceed IP66/IP67 and NEMA 6 enclosure requirements. It is also available in stainless steel that exceeds NEMA 4X and NEMA 6P requirements and is ideal for stringent washdown environments, including those where high-pressure steam or caustic chemicals are needed to meet regulatory requirements.

The HD20 features a max. 440N Axial and Radial Bearings, -40° to +100°C temperature range and unique labyrinth double-sealed housing, and optional dual “redundant” outputs and is covered by a two-year warranty (one year for bearings). NorthStar’s traditional quality, reliability and value are built-in to every HD20 encoder. Also available in this series, is an Intrinsically Safe version certified to ATEX EEx ia IIB T4 when used with the appropriate IS Barrier. Accessory barriers can be supplied with the encoder.

Hengstler HD 20 Incremental Encoder Features

  • Single or Dual output
  • ATEX Certification available for Intrinsically Safe application
  • High-Resolution Unbreakable Disk
  • Industrial Duty Connector
  • NEMA 4X / IP67 Rated
  • Nickel or Stainless Steel Housing available.


The HD20 Harsh-Duty Optical Encoder is ideal for machine applications with corrosive environments that demand heavy washdown protection. This compact, the special-duty encoder is designed to exceed IP66/IP67 and NEMA 6 enclosure requirements with a PPR range through 3600. ATEX certification is also available for intrinsically safe applications.

  • Converting Machinery
  • Material Handling
  • Packaging Equipment
  • Pickling Equipment
  • Processing Equipment

Another Article:

Hengstler HD 20 Incremental Encoder Specification

Product Family HD20
Ordering Information Rotary Encoder HD20
Function / Application Incremental
Technology Optical
Approval CE
Housing Diameter [mm] 51 mm
Solid- / Hollow Shaft Solid 10 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
Ex atmosphere
CSA approval
Connection Cable
Revolutions [rpm] 6.000 rpm
Number of Pulses 1 … 3600
Interface Open Collector NPN

Download Data Sheet: Incremental Encoder HD 20

Ref: hengstler.de

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