Bestech releases new M5 series 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 √ò5mm 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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