A Safe Bet

Total and Time Counters as well as Proximity Switches Now Available with ATEX Certification

The pneumatic total and time counters 495, 497, and 499, along with the proximity switches from the 490 series by Hengstler, are now ATEX-certified. This makes them ideal for use in environments with potentially explosive atmospheres.

Pneumatic counters and switches are the best choice wherever electronic or mechanical versions should not be used for safety reasons. This applies to areas where flammable powders are transported, as well as to oil and gas processing facilities. Beyond that, Hengstler’s pneumatic total and time counters and proximity switches offer a powerful alternative to mechanical, electronic, or electromechanical models, as they function reliably even in environments with high dust levels or electromagnetic interference.

With Hengstler’s pneumatic counters, control systems in hazardous environments can be built more easily than with electronic counters or PLCs, and they are also explosion-proof. Ideal applications include control systems for pressurized enclosures in explosive zones or the control of periodic vibrations in vibratory conveyors handling explosive goods.

Precise and Maintenance-Free Operation

The 497 preset counters are quick and easy to install and can be operated conveniently via push-button settings. They are actuated by compressed air pulses through either an M5 hose fitting or a quick-connect coupling. Depending on the version, the counters either add these pulses from zero and emit a pneumatic output signal upon reaching a preset value (adding version), or subtract pulses from a preset value (subtracting version). Both variants feature a three- or five-digit display, are maintenance-free, and operate reliably and precisely within a temperature range of 0°C to 60°C (for Ex applications). Operating pressure ranges from 2 to 6 bar.

Position Detection Even in Hazardous Areas

Hengstler’s 490 pneumatic proximity switches detect the exact position of workpieces, tools, or machine components in space without contact. They emit a pneumatic signal when a magnetic field or iron part enters their detection range. Detection works even if a wall made of non-magnetic material lies between the object and the switch.

Thanks to their compact design, the switches are suitable for numerous applications, such as determining the position of conveyor belts in transport systems or pneumatic cylinders in machines and systems. The proximity switches operate at a pressure range of 2 to 6 bar and do not require a continuous compressed air supply. They can be used in a temperature range from 0°C to +60°C, making them highly versatil