IN Brief:
- IND-MAX DUAL incorporates two independent inductive encoder systems with separate sensing and electronics.
- The DUAL range covers specified 125, 180, 200, 250 and 300 mm outer diameters.
- Resolution reaches 23 bits in the larger versions; safety behaviour depends on the complete control and diagnostic architecture.
FLUX GmbH has introduced the IND-MAX DUAL inductive angle encoder, incorporating two independent measurement systems within one housing for redundant absolute position feedback. The Austrian company’s design separates the sensing elements and associated electronics of the two channels. It is intended for motion systems that need a second position reading without installing two independent encoder enclosures around the same shaft.
IND-MAX DUAL is available in specified outer diameters from 125 to 300 mm. The range includes 125, 180, 200, 250 and 300 mm options, with numerical resolution reaching 23 bits on larger models. FLUX lists 21-bit resolution at 125 mm and 22 bits at 180 mm, while the 200, 250 and 300 mm variants reach 23 bits. This variation needs to be reflected in part selection rather than treating the headline maximum as a universal rating.
An absolute angle encoder produces a position reading that can be interpreted without first accumulating incremental pulses from a reference movement. A motion controller uses that position information to compare measured angle with the commanded trajectory and adjust a drive. A second independent measurement chain creates the basis for cross checking the reported angles and for identifying discrepancies, provided the controller and fault handling logic are configured for that purpose.
Putting both systems into one enclosure reduces the mechanical space that would otherwise be required for two separate encoder installations. It can simplify the positioning of sensing elements around a common shaft and reduce the number of mounting arrangements. Available clearance, mounting tolerances, connector access and cable routing still influence the final installation, particularly on compact actuators used in robotics and aerospace mechanisms.
Inductive sensing uses electromagnetic coupling between patterned elements to derive relative angular position. This provides an alternative to optical measurement in environments where contamination, vibration and mechanical packaging constrain the choice of feedback device. The IND-MAX family is designed for demanding aerospace, naval and robotic applications, with the DUAL option directed at systems requiring redundant measurements for higher reliability.
Resolution and angular accuracy need to be considered separately. FLUX’s product information quotes accuracy as tight as ±0.002° for specified larger IND-MAX variants, while lower diameter versions have different figures. More bits provide finer numerical position increments, but the accuracy of the physical measurement also depends on the sensor design, mounting geometry and operating conditions. Model level datasheets remain the basis for the final system error budget.
The two electronic channels can be compared to flag disagreement or support separate processing routes. Their independence is valuable when faults affect one sensing chain, but both remain mounted in the same mechanical environment. Shaft movement, incorrect assembly or damage to the common housing can influence both readings, so a redundant installation needs diagnostics for shared failures as well as faults confined to one channel.
Downstream electronics determine how the duplicated signals contribute to machine safety. Two channels connected to a single controller may still share power, processing or communication paths; an alternative architecture can separate those functions where required. The system must define permissible disagreement, how it detects invalid readings and what action the drive takes after a fault. Those decisions are governed by the machine’s full safety assessment rather than the encoder specification alone.
FLUX describes rugged environmental options across the IND-MAX family, including IP67 construction and extended operating temperature configurations. Final protection and temperature ratings require selection of the relevant DUAL part and its available options. Surgical robotics, autonomous platforms, aircraft and naval equipment have different operating environments, so mechanical qualification and electrical integration are established for the particular installation.
With DUAL spanning several diameters and resolution classes, equipment designers can trade available space against the accuracy and precision needed by the motion system. Independent position channels in one housing provide a compact feedback architecture, while verified mounting, separated downstream processing where appropriate and defined fault response turn those signals into usable system redundancy.
