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New very low
differential pressure transducer.
The new 266 series
very low differential pressure transducer from Gems Sensors offers
bidirectional differential pressure measurement from as low as
0 – 50 Pa up to 5 kPa full scale at an accuracy of ±1%.
The sensor also
has excellent long term stability, which reduces the need for
service calls after installation. The 266 series is based on
a durable variable capacitance sensor, which has significant
advantages over strain gauge based sensors.
A sensing diaphragm
in the unit is deflected by the pressure, which in turn changes
the dielectric gap and hence the capacitance of the sensor. Custom
built ASIC signal conditioning within the unit then produces
a high level output which needs little amplification, providing
accuracy and long term stability. The unit has very tight zero
tolerances, which improves accuracy of measurement in low flow
applications, and minimises the need for zero setting in the
field. This in turn means lower installation costs.
The sensor is
manufactured to high standards from stainless steel, which gives
excellent thermal stability and superior overpressure protection:
the unit will withstand pressures up to 69 kPa. The 266 also
has low EMI/RFI susceptibility, allowing better control in areas
subject to walkie-talkie or cell phone interference, and can
be used with unregulated power supplies owing to its internal
regulation.
The transducer
is very attractive for heating and ventilating systems, where
it improves air flow control, particularly under low flow conditions.
Its bidirectional capability is valuable in clean rooms and isolation
rooms where containment is critical.
The unit also
has potential applications in energy management systems, environmental
pollution control, oven pressurisation and furnace draft controls,
and variable air volume and fan control.
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