Hengstler Absolute Rotary Encoder ACURO AX73

Absolute Rotary Encoder ACURO AX73

 Absolute Rotary Encoder ACURO AX73


In the development of equipment for use in hazardous environments, selecting the right sensor plays a crucial role. First and foremost, explosion protection of the sensor itself is critical. Additional harsh requirements, such as the ability to withstand severe shock and vibration, and the need for corrosion resistance due to the working atmosphere, are placed on the encoder by the application itself. And, of course, an accurate and high-resolution sensor signal is required in spite of all other demands.

Hengstler has incorporated all these requirements into our new, explosion-proof, absolute encoder AX73 with interfaces SSI/BiSS or Profibus. With the addition of AX73, our explosion-proof product range is complete!

The optical scanning system of the AX73 encoder provides a highly accurate, high-resolution sensor signal that is also resistant to the strongest external magnetic fields.

The connection concept of the AX73 allows the routing of cabling and the final encoder installation to be done in separate steps. This provides significant cost and time savings during installation, as cabling can be done in advance. Emergency servicing can also be done more quickly, due to the ability to simply unplug the encoder cable and plug it into the replacement encoder. With its ATEX and IECEx approvals, the Hengstler AX73 is certified and approved for international use, thus providing the user a global guarantee of safety and reliability in hazardous areas.


  • ATEX and IECEx certified for Gas and Dust
  • High precision standard as ACURO Industry
  • Resolution up to 22 Bit Singleturn + 12 Bit Multiturn (depending upon interface)
  • Optical encoder with a true geared Multiturn
  • Interface: SSI / BiSS, Profibus
  • Easy and fast field installation
  • Robust design
  • Extreme corrosion resistance: high grade stainless steel housing (1.4404 / AISI 316L)
  • Protection class IP66/67

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Product FamilyAX65
Ordering InformationRotary Encoder AX65
Function / ApplicationAbsolute
ApprovalCE, ATEX und IECEx
Housing Diameter [mm]73,5 mm/76 mm
Solid- / Hollow ShaftSolid 10 mm
Protection Rating HousingIP66, IP67
Operating Temperature [°C]-40 ... +70 °C
Housing OptionStainless Steel
Increased Environmental RequirementsChemical resistance
 Seawater resistant
 Ex atmosphere
ConnectionTerminal Box
Revolutions [rpm]3,000 rpm
Resolution ST [Bit]10 ... 22 Bit
Resolution MT [Bit]12 Bit
InterfaceBiSS / SSI

Download Data Sheet: Absolute Rotary Encoder ACURO AX73

Ref: hengstler.de