Product Description:

The HS35R02507241 is an incremental hollow-shaft encoder manufactured by Danaher for the Dynapar Encoders series. It converts rotational motion into two square-wave channels plus an index pulse so controllers can monitor shaft position and velocity. The housing clamps to a motor or gearbox end bell while a flexible tether prevents body rotation, making the model suitable for closed-loop speed regulation on conveyors, winders, and packaging machinery.

This model provides a resolution of 250 PPR, meaning each revolution generates 250 equally spaced pulses that a drive or PLC counter can read for precise speed feedback. Signal integrity is maintained up to a frequency response of 100 kHz, which supports high pulse counts at rapid shaft speeds. Mechanical limits include a maximum continuous speed of 3600 rpm and an allowable axial shaft load of 30 lb; within these limits, the bearings meet their rated service life. The sealed aluminum enclosure carries a NEMA 4 / IP66 rating, blocking dust ingress and high-pressure water jets so the encoder can operate in washdown or outdoor environments.

Radial loading capability reaches 40 lb, allowing the hollow hub to slide over keyed or split-collar shafts without stressing the bearings. Fast edge transitions are supported by a rise and fall time of less than 1 µs, producing clean differential outputs for electrically noisy environments. The encoder requires a running torque of 4.5 oz-in and starts from a standstill with only 5.0 oz-in, reducing additional torque demand during motor startup. Electrical symmetry is 180° ±18°, while quadrature phasing remains at 90° ±22.5°, maintaining accurate phase relationships for directional decoding. The stainless-steel bore is finish-ground to a tolerance of +0.0003/+0.0005 in, so the hub fits snugly yet releases easily during maintenance. Overall weight does not exceed 16 oz, keeping overhung mass low on small servo or induction motors.