Keller M5 series miniature pressure sensors

Capable of measurement rates of up to 50 kHz, the pressure sensors in the Keller M5 series are intended for operating temperatures between -40 and +180°C with a narrow total error band (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 the piezoresistive pressure sensor’s broad dynamic range of 50 kHz, the measurement signal is not digitised. Instead, the purely analog signal path 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. The measurement system, consisting of the pressure sensor and signal converter, undergoes an end-to-end calibration at the factory once the customer-specific parameters have been determined. In addition, the operating temperature range of -40 to +125 °C for the remote electronics satisfies the demands required by engine test benches, for instance.