AX70-71
The Hengstler AX70 and AX71 are explosion-proof absolute shaft encoders designed for use in hazardous industrial environments. The AX70 features an aluminium housing, while the AX71 uses a stainless-steel housing. Both versions are designed to provide the electrical performance of the ACURO Industry range, with protection available up to IP67 and resolution of up to 34 Bit, combining 22-bit singleturn with 12-bit multiturn.
Key Features
- Explosion-proof design with ATEX certification for gas and dust applications
- Electrical performance equivalent to the ACURO Industry range
- Protection class available up to IP67
- Compact 70 mm housing diameter
- Robust construction for demanding industrial applications
- Available in aluminium (AX70) and stainless steel (AX71)
- Marine-grade stainless-steel version available
- Resolution up to 34 Bit: 22 Bit singleturn + 12 Bit multiturn
- Supports SSI, BiSS, programmable SSI, Profibus, CANopen and DeviceNet
- Designed for applications such as enamelling production lines, petrochemistry, bottling machines, mixers, silo works and mills
Explosion Protection
The AX70/AX71 is available with an explosion-proof enclosure and has been assessed under EC-Type Examination Certificate PTB 10 ATEX 1036 X.
The encoder is approved for explosive atmospheres with the following classifications:
- Ex II 2 G Ex db IIC T6 Gb
- Ex II 2 D Ex tb IIIC T85°C Db
- Ex II 2 G Ex db IIC T4 Gb
- Ex II 2 D Ex tb IIIC T135°C Db
The encoder also carries IECEx certification PTB 12.0002X. Additional certifications are specified for the American and Chinese markets.
Mechanical Specifications
Speed and Ambient Temperature
- The permissible speed and ambient temperature depend on the selected interface, protection class and temperature class.
- For SSI/BiSS, the datasheet specifies:
- IP64: up to 10,000 rpm under specified T4/T6 temperature conditions
- IP67: up to 10,000 rpm under specified T4 conditions
- IP67/T6: maximum 1000 rpm at −40°C to +60°C
- IP67/T4: up to 6000 rpm at −40°C to +60°C, or 10,000 rpm at −40°C to +55°C
- For Profibus, CANopen, DeviceNet and SSI-P, the permitted combinations vary according to the protection and temperature class, with maximum speeds from 1000 to 10,000 rpm as specified in the datasheet.
Electrical Specifications
SSI / BiSS
- Supply voltage: 10–30 V DC
- Current consumption: 220 mA (singleturn) / 250 mA (multiturn)
- Drivers: Clock and Data, RS422
- Output code: Binary or Gray
- Singleturn resolution: 10–22 Bit
- Multiturn resolution: 12 Bit
- Control input: Direction
- Alarm output: Alarm bit
SSI Programmable
The programmable SSI version operates at 10–30 V DC with maximum current consumption of 250 mA. It supports 10–17 Bit singleturn and 12-bit multiturn resolution.
