Ø90mm absolute modular encoder

ARH90

The ARH90 offers a flexible and precise position sensing solution for diverse applications. It features a housed stator that can be mounted and tightened in various ways for optimal integration. A range of interchangeable rotors with high-precision glass scales enables customers to choose the configuration that best fits their mechanical design needs. This modular concept ensures easy adaptation, high accuracy, and reliable performance in demanding environments.

• Housed stator
• Various mounting types and options
• Zero set and direction control
• Dual LED feedback
• Enhanced by OrbiSyncTM dual sensor technology

Mechanical data

Stator
Material FR4 and aluminum housing
Outside diameter (OD) 90 mm
Inside diameter (ID) 50.8 mm
Centering collars diameter 90 h7 mm
Height 8.5 mm
Weight (without cable) 80 g

 

Rotor
Material Stainless steel hub + chromium circular scale on glass disc
Mechanical speed 5000 RPM

 

Rotor for deep shaft mounting format
Outside diameter (OD) 70 mm
Inside diameter (ID) 40 H7 mm
Mass moment of inertia < 30 x 10-6 kgm2
Weight 40 g

 

Plain rotor format
Outside diameter (OD) 70.5 mm
Inside diameter (ID) 45 H7 mm 40 H7 mm 30 H7 mm
Mass moment of inertia < 67 x 10-6 kgm2 < 73 x 10-6 kgm2 < 80 x 10-6 kgm2
Weight 80 g 95 g 115 g

 

Screw mount rotor format
Outside diameter (OD) 70.5 mm
Inside diameter (ID) 40 H7 mm
Mass moment of inertia < 65 x 10-6 kgm2
Weight 77 g

 

Installation tolerances (between rotor and stator)
Axial displacement 1.75 ± 0.5 mm
Tangential displacement of the stator ± 0.3 mm
Radial displacement of the stator ± 0.3 mm
Permissible radial runout of the customer shaft 20 um

 

Environmental data
Operating temperature  -40oC – 100oC
Storage temperature  -40oC – 100oC
Relative humidity 98 % (non condensing)
Permissible vibration (10 to 2000 Hz) 20G sweep (EN 60068-2-6:2008)
Permissible shock (6 ms) 100G saw-tooth (EN 60068-2-27:2009)
Protection IP00
Environmental compliance RoHs

 

Electrical data

Electrical interface SSI / BISS
Output code Binary
Resolution Up to 24 bit
Accuracy ± 10″
Repeatability 2.5″
Supply voltage  + 5V ± 10%
Current consumption (without load) < 220 mA

Zero position setting function
To enhance flexibility in system integration, the encoder includes a dedicated Zero Set input wire, allowing users to define the absolute zero position according to the specific requirements of their application. By activating this input at any desired mechanical position, the encoder reassigns that position as the new absolute zero, ensuring seamless alignment with the machine’s coordinate system. This feature eliminates the need for mechanical repositioning or external software tools, streamlining both installation and commissioning processes. This functionality is especially useful in applications where mechanical reference points vary between builds, or where field recalibration is needed after maintenance or replacement.

Counting direction configuration
To support flexible integration with various mechanical systems, the encoder features an additional input wire that allows users to configure the absolute position counting direction. By toggling this input, the encoder can be set to count position values in either a clockwise (CW) or
counterclockwise (CCW) direction — ensuring compatibility with the specific rotational logic of the application. This feature enables quick adaptation without requiring mechanical changes or firmware reconfiguration, simplifying installation and improving alignment with system control schemes.

Orbisync™ Technology
Orbisync™ is a next-generation optical encoder platform developed for high-precision absolute rotary sensing. Leveraging a dual-sensor architecture with built-in intelligence, it continuously calibrates itself to maintain accuracy over time and varying conditions. Advanced onboard processing ensures clean, reliable position data, even in dynamic environments. Its modular design supports both compact open-frame and fully housed configurations, making it a versatile solution for modern motion systems.

More information available in the full datasheet.

Accessories

Downloads

Order code

ARH90 – X1 – X2 – X3 – X4 – X5 – X6
Output signals interface (X1) Bit number (X2) Rotor type (X3) Rotor inner diameter (X4) Cable length (X5) Connector (X6)
S – SSI
B – BISS
B01 – 1 bit
B24 – 24 bits
D – Deep shaft mounting format
P – Plain rotor format
S – Screw mount rotor format
20 – ⌀20 H7 mm
30 – ⌀30 H7 mm
40 – ⌀40 H7 mm
45 – ⌀45 H7 mm
RC005 – 500 m
RC01 – 1 000 mm
RC02 – 2 000 mm
W – without connector
IDC – 8-pins connector (only for ribbon cable)

Order form

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