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Bestech releases miniature sensors for static and dynamic pressure measurements

Bestech Australia announces the release of the new M5 series miniature sensors from KELLER designed for static and highly dynamic pressure measurements up to 50 kHz. Bestech distributes KELLER pressure and level transducers and transmitters in Australia and New Zealand.

The new KELLER M5 series miniature sensors feature a high operating temperature range up to 180°C; measurement accuracy of ±0,1 %FS; installation size (M5 connection); and remote, precise signal conditioning (0…10 V).

Measuring highly dynamic pressure variance requires a direct connection to be achieved between the sensing element and the medium. To meet this requirement, KELLER developed a micromechanical solution without the 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 excellent fluid dynamics, which in turn is secured flush at the front of the pressure connection.

The M5 series design enables dynamic measurements with a bandwidth of 0 – 50 kHz and offers several benefits including excellent decoupling of mounting forces and structure-borne vibration, extensive media compatibility, and durability delivered by anti-oxidation coatings.

Key features of the M5 series miniature sensors also include overpressure protection of up to five times the measurement range; pressure connection with an external thread of just Ø5mm for installations in space-limited locations; wide operating temperature range of -40°C to +180°C with narrow total error band of ±1%; typical output signal range of 80 mV (based on a 1 mA supply) without the remote signal converter; and 3 bar, 10 bar and 30 bar measurement ranges available for absolute pressure measurements.

Separat­ing the pressure sensor and 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 piezo-resistive pressure sensor’s broad dynamic range of 50 kHz, the design does not digitise the measurement signal to the sensor to be produced. Instead, the purely analogue 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.

The thermally ultra-robust pressure transducers in the KELLER M5 series support high-precision static and dynamic measurements up to a bandwidth of 50 kHz and at working temperatures of up to 200°C at the pressure sensor. The remote pressure sensors featuring the M5 connection thread are ideal for taking highly dynamic measurements at close proximity. The M5 Series can even carry out the measurement at the very thin pipes used in engine test benches, wind tunnels or turbine blade tests.

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