ETx25K kit encoders use the application's shaft for reliable angle measurement: as a single-turn (360°) with analogue, PWM, incremental, or SPI output or as a multi-turn version (up to 72,000°) with analogue output.

The ETx25K encoders are part of the ETx25 family. Common to these encoders is non-contact angle measurement, high reliability, long lifespan and independent linearity of up to ±0.3% for single-turn and ±0.05% @3600° for multi-turn variants. The latter can be programmed by the customer on site.

The compact ETx25K flange housing (Ø25 mm with only 8 mm housing depth) in protection class IP67 is fixed in the application with two M3 screws (not supplied). The magnet (supplied) is positioned in the application opposite the front of the ETx25K housing. There is no mechanical connection between the magnet and the encoder housing, so the encoder can be positioned away from vibration and thermal effects. A circular groove for an optional O-ring is provided on the front of the ETx25K housing. It is used to protect against the ingress of liquid and dust into the customer unit. The O-ring (supplied with option D) is inserted between the mounting plate and the encoder. Electrical connection options such as round or ribbon cable complete the profile. The following electronics are available:

ETA25K analogue singleturn absolute encoder (redundant version ETA25KX):
Supplies an absolute analogue signal with 12-bit resolution. Galvanically isolated and redundant electronics are available for safety critical applications (see ETA25KX series datasheet).

ETA25KPM programmable analogue multiturn or singleturn absolute encoder:
Programmable encoder for rotation angles up to 72000° (200 revolutions), can also be used as a programmable singleturn encoder. 12 bit resolution with current or voltage output. Signal can be programmed in the field.

ETI25 singleturn incremental encoder:
With up to 10,000 pulses / per revolution and availability of following output signals: TTL, Push-Pull or Open Collector

ETS25 serial singleturn angle encoder:
Available with SSI (10-18 bit) or SPI (14 bit resolution, available as redundant version)

ETP25K PWM singleturn encoder:
With PWM output

The ETA25KPM is a programmable kit encoder. The electrically effective angle of rotation of 10 turns (3600°, CW) is preset at the factory. If you need specific angle measuring ranges for your application (up to 72,000°, CW/CCW), you have the option of having the electrically effective angle of rotation and sense of rotation programmed by us or making the settings yourself on site. For the latter, we recommend our "PRO" programming unit. It can be used to make the settings for each and thus any number of encoders. Of course, you can adjust the encoder to the application by means of an (own) external circuit, which we describe in the programming instructions.

The wide selection of electronic variants for different power supplies as well as the large number of electrical interfaces for the output of measured values make it possible to optimally integrate ETx25K encoders into the application. In addition, the encoders can be customized. But already on the basis of the order matrices in the data sheets, hundreds of possible combinations can be realized at short notice. Popular options include

• changing the sense of rotation from CW (clockwise) to CCW (counterclockwise),
• user-defined rotation angles
• a sealing ring for sealing between the housing and the mounting surface