KM3701

The Beckhoff KM3701 is a high-precision module in the KM Bus Terminals series from Beckhoff, designed specifically for differential pressure measurement with a measuring range of -100…+100 hPa. This 1-channel analog input device delivers measurements as a digital 16-bit value with a resolution of 0.1 hPa per digit and a measurement error of 3% relative to full scale. Featuring a compact design weighing approx. 100 g and requiring no power contact, the KM3701 integrates seamlessly into modern industrial automation systems. It operates reliably on non-aggressive gases and supports fast, accurate monitoring for critical pressure differentiation tasks.

Technical capabilities of the KM3701 include a measuring speed of 5 ms and a maximum overload tolerance of 500 hPa (differential) and 5000 hPa to ambient. The module’s current consumption on the K-bus is 15 mA typical, ensuring low power draw and efficient bus utilization. Its bit width in process image of 3-byte input/output supports high-resolution data transfer without compromising control system performance. Built to withstand harsh environments, the terminal conforms to EN 60068-2-6/EN 60068-2-27 for vibration and shock resistance. With a storage temperature range of –25…+85°C and an operating temperature range of 0…+55°C, the KM3701 maintains stable performance across variable conditions.

Operational features of the KM3701 emphasize reliability and ease of use. The module carries an IP20 protection rating and is designed for variable installation positions on a 35 mm DIN rail conforming to EN 60715. Its push-in connection technology enables quick wiring and reduced installation time. The integrated diagnostics report over-range and under-range conditions, allowing operators to detect anomalies in pressure circuits instantly. Without any power contacts, this terminal minimizes wiring complexity and enhances system safety.

Integration of the Beckhoff KM3701 into automation architectures is straightforward, as it communicates directly over the EtherCAT-based KM Bus. The terminal complements other KM Bus Terminals for functions such as temperature input or digital I/O, enabling compact, modular I/O stations. Applications include monitoring pressure differentials in process engineering, HVAC systems, pneumatic control cabinets, and laboratory equipment. Its professional-grade design and adherence to industrial standards make the KM3701 an ideal choice for precision pressure measurement in demanding automation environments.