Differential pressure transducer offers
high accuracy, longer life.
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
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