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Bestech launches new ultrafast miniature transducers

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article image KELLER’s new M5 sensor
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Bestech Australia has introduced a new range of sensors for static and highly dynamic measurements up to 50 kHz.

KELLER’s new series M5 sensors offers advantages such as an 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).

Keeping in mind that highly dynamic pressure variance is best measured by achieving a direct connection between the sensing element and medium, the KELLER develop­ment team designed a micromechanical solution without a media isolation diaphragm, capillary tubing, sealants or adhesives.

The M5 series silicon sensors are soldered on the rear to a support­ing element designed for excellent fluid dynamics, which in turn is secured flush at the front of the pressure connection. This sophisticated design enables dynamic measurements with a bandwidth of 0-50 kHz and offers a number of additional benefits including excellent decoupling of mounting forces and structure-borne vibration, extensive media compatibility and durability from the anti-oxidation coatings.

Key features of the M5 series pressure sensors also include overpressure protection of up to five times the measurement range and its pressure connection; external thread of just Ø5mm for installations in space-limited locations; operating temperatures range of -40°C and +180°C with a 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 measurement ranges of 3 bar, 10 bar and 30 bar 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 piezo-resistive pressure sensor’s broad dynamic range of 50 kHz, 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.

Once the customer-specific parameters have been determined, an end-to-end calibration is done at the factory for the measurement sys­tem, consisting of the pressure sensor and signal converter. In addition, the operating temperature range of -40°C to +125°C for the remote electronics satisfies the exceptional demands required by engine test benches.

The thermally ultra-robust pressure transducers in the 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. With its M5 connection thread, the remote pressure sensors are ideal for taking highly dynamic measurements at close proximity, even in very thin pipes used in engine test benches, in wind tunnels or during turbine blade tests. 

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