Keller M5 series pressure sensors

The key to measuring highly dynamic pressure variance is to achieve, as far as possible, a direct connection between sensor element and medium. The Keller M5 offers a micromechanical solution without media isolation diaphragm (with its damping effect), capillary tubing, sealants or adhesives. In the M5 series, the rear of the silicon sensor is soldered to a supporting element designed for good fluid dynamics, which in turn is secured flush at the front of the pressure connection. This design enables dynamic measurements with a bandwidth of 0-50 kHz.

The pressure sensors in the M5 series are intended for operating temperatures between -40 and +180°C with a narrow total error band (ie, including temperature errors) of ±1%. Without the remote signal converter, they come with a typical output signal range of 80 mV (based on a 1 mA supply) and an individual calibration certificate. The 3, 10 and 30 bar measurement ranges are available for absolute pressure measurements. Separating the pressure sensor and the signal converter enables measurements at close proximity, even in units installed in cramped conditions and exposed to high temperatures.

To avoid any reduction in dynamic range, Keller has opted not to digitise the measurement signal to be produced. Instead, the purely analog signal is adjusted in real time via the compensation electronics, which are fully controlled by a microprocessor. This ensures the output signal, amplified to 0-10 V, retains the full dynamic range of the sensor signal.