Sensata/BEI DSK5H/DSM5H Safety Incremental Encoder (SIL3, PLe)

Sensata/BEI DSK5H and DSM5H incremental safety encoders are 58 mm functional-safety encoders certified to SIL3 and Category 4 / PLe according to IEC 61508 and EN ISO 13849, intended for safe drive feedback according to IEC 61800-5-2. DSK5H has a blind hollow shaft (9.52–14 mm), while DSM5H has a solid shaft (6 / 9.52 / 10 mm); the DSM5X version is available in an AISI 316 stainless-steel housing with IP68/69K protection. Resolution is up to 2500 pulses per revolution, with TTL/RS422, HTL or 1 Vpp sine/cosine digital outputs-compatible with existing encoders when migrating to a higher safety level. Supply is 5 V DC or 11–30 V DC. The body is aluminium, the cover is coated zinc alloy, the shaft is AISI 303 stainless steel and the bearings are sealed; continuous speed is 6000 rpm, temporarily 9000 rpm, with service life >24×10⁹ revolutions. Shaft load is 20/40 N for DSK5H and 40/80 N for DSM5H (axial/radial), mass approx. 0.3 kg. Protection is IP65, operating temperature −20 to +85 °C, with high shock and vibration resistance. The encoders are intended for safe speed and position measurement in machine and vehicle drives requiring safety functions.

Main features:

• SIL3 and Category 4 / PLe certification according to IEC 61508 and EN ISO 13849
• 58 mm diameter; DSK5H with 9.52–14 mm blind hollow shaft, DSM5H with 6 / 9.52 / 10 mm solid shaft
• Resolution up to 2500 pulses/rev., TTL/RS422, HTL or 1 Vpp sine/cosine outputs
• Supply 5 V DC or 11–30 V DC
• Continuous speed 6000 rpm (9000 rpm temporary), service life above 24×10⁹ revolutions
• DSM5X version in AISI 316 stainless steel with IP68/69K protection

Durability and compliance [from DSK5H and DSM5 datasheets]:

• Shock 500 m/s² (≈51 g), 6 ms half-sine, and vibration 200 m/s² (≈20 g) from 55–2000 Hz-DSM5H and DSM5X according to EN 60068-2-27 and EN 60068-2-6. DSK5H hollow-shaft version: shock and vibration 100 m/s² (≈10 g), 10–2000 Hz
• IP65 protection (DSK5H, DSM5H); DSM5X is the higher-IP version-IP68/69K
• Salt mist 96 h (DSK5H, DSM5H) and 168 h (DSM5X) according to EN 60068-2-11 Part 2
• Humidity 93% at 65 °C according to EN 60068-2-38
• Operating and storage temperature −20…+85 °C, measured at the encoder
• EMC at increased levels: immunity EN 61000-6-2, emissions EN 61000-6-4
• Insulation 1000 V RMS
• Functional safety: IEC 61508, IEC 62061, ISO 13849-1, IEC 61800-5-2-up to SIL3 / PLe when safety-manual requirements are met
• Z and Z/ signals are not safety signals