Explosion-Proof Encoder

Sept. 25, 2018
Sensata's multi-turn encoder offers a wide temperature range of –40 to +85°C.

MAXX is the first explosion proof stackable multi-turn encoder for use in extreme oil and gas applications. Absolute multi-turn encoders are the ideal position sensing solution for oil and gas applications such as Drawworks, top drives, and pipe handling equipment.


The encoder is ATEX and IECEx certified to operate in explosive environments and features a Profibus output in a unique, stackable package. CANopen and SSI outputs are also available.


The MAAX provides up to 16 bits of resolution as well as up to 16 bits of turns by mechanical counting. This workhorse product operates directly in Zone 1 environments without the need for an accompanying Intrinsic Safety barrier.


The stackable and explosion proof design, the first of its kind, makes for a simple installation wherever encoders are mounted in tandem to provide multiple signals for redundancy or when data sharing is desired.  The Profibus interface simplifies system set up as it allows for daisy chaining products together without the need for running a control cable from the panel to each individual component. 


All exposed parts are either stainless steel or hard anodized to resist corrosion. This rugged encoder is shock and vibration resistant and can operate in field temperatures from -30 to +65°C.  Fitted with a unique 20 mm diameter integrated coupling, the housing can be rigidly mounted, reducing stress to the encoder’s bearings and providing a secure attachment for the hazardous area conduit fittings.  A through hollow shaft design with up to a 30 mm flexible shaft bore is also available to fit a wide range of installation requirements.


LED status lights make it easy to monitor the encoder’s function during set-up and operation. The terminal box simplifies installation by allowing the unit to be pre-wired and tested prior to assembly.  A flexible internal connector within the terminal box helps simplify cable gland installation. To prevent losing screws while mounting, captive screws come standard with the terminal box, which is tethered to the encoder body for safety.


  • ATEX/IECEx Explosion Proof Certified
  • Profibus interface standard
  • 30 mm max. thru shaft, 20 mm max. integrated coupling versions
  • Robustness and excellent resistance to shock / vibration
  • Double or triple mounting possible
  • High protection level IP65
  • Wide temperature range –40 to +85°C
  • 5 to 30 Vdc power supply
  • High resolution available: 65 536 counts per revolution (16 bits resolution)
  • Standard number of turns: 4096 (12 bits), 16 bits option available upon request