For AVS78E-021K2A0GN-0012, EncoderWorks can provide a custom compatible replacement focused on Gray-code SSI cable mapping, 12-bit singleturn scaling, K2 axial cable routing, and Ø12 mm clamping-flange shaft fit. This model should not be treated like the servo-flange version. The shaft size may be the same, but clamping-flange centering, coupling load, mounting reference, and cable exit clearance create a different replacement boundary.
The AVS78E-021K2A0GN-0012 is an explosion-proof SSI singleturn absolute encoder configuration with Gray code, 12-bit singleturn resolution, 10–30 VDC supply, aluminum housing execution, Ø12 mm x 25 mm solid shaft, clamping flange, K2 2 m cable connection, and axial exit. It should be used as 4096-step singleturn angle feedback, not as multiturn position feedback.
The first failure boundary is SSI cable accuracy. Clock+ / Clock- and Data+ / Data- must remain true RS422 differential pairs. If conductor assignment, Gray decoding, shield grounding, preset wiring, or counting-direction input is changed, SSI communication can be present while the PLC reads the wrong shaft angle.
This replacement fails when SSI communication is present, but the PLC reads the wrong singleturn position because cable mapping, Gray-code decoding, 12-bit word length, monoflop timing, preset input, or counting direction does not match the original encoder. That is a signal-chain and parameter failure, not simply a sensing failure.
The second boundary is clamping-flange mechanics. The Ø12 mm solid shaft, coupling fit, clamping-flange reference, axial cable clearance, grounding, and axial/radial shaft load must be checked together. Cable bend stress must not pull the housing or disturb shaft alignment.
The replacement decision should first confirm Gray SSI format, 12-bit singleturn mapping, K2 2 m axial cable assignment, Clock/Data differential pairs, 20 ±10 µs monoflop behavior, 10–30 VDC supply, PRESET zero-set input, counting-direction input, aluminum housing execution, Ø12 mm solid-shaft fit, clamping-flange mounting, axial cable clearance, shield grounding, flameproof cable handling, and shaft load. EncoderWorks treats AVS78E-021K2A0GN-0012 as an industrial encoder custom compatible solution where SSI cable accuracy and Ø12 clamp-shaft mechanics decide field reliability.
Typical production lead time: 15 working days.
Key Data
| Item | Data |
|---|---|
| Model | AVS78E-021K2A0GN-0012 |
| Encoder type | Explosion-proof singleturn absolute encoder |
| Interface | SSI / RS422 |
| Resolution | 12-bit singleturn |
| Position range | 4096 steps per revolution |
| Code | Gray |
| Supply voltage | 10–30 VDC |
| Transfer rate | 0.1–2 MBit/s |
| Housing execution | Aluminum |
| Shaft type | Solid shaft |
| Shaft size | Ø12 mm x 25 mm |
| Flange | Clamping flange |
| Connection | K2 cable, 9 strands, 2 m |
| Exit position | Axial |
| Protection focus | ATEX / IECEx flameproof enclosure, IP66 |
| Main engineering anchor | Gray SSI and clamp shaft |
| Main failure boundary | Wrong cable mapping, Gray decoding error, preset fault, flange mismatch |
