About PCI Differential Pressure and Flow Transducers
PCI's differential
pressure transducers (DPT Series) and flow transducers (FT Series) are
"stand-alone" components which can be mounted into a control panel enclosure
for an entire system or major subsystem.
The DPT Series transducers
measure and convert pneumatic input differential pressure signals to an
electronic analog output signal linear to differential pressure.
The FT Series transducers
are similar to the DPT Series except that both total and static pressure inputs
are required. The measured difference between the total and static pressure is
the velocity pressure. By performing square root extraction and scaling to the
velocity pressure signal, the resulting output signal is linear to velocity
(fpm) or volume (cfm). The output is an electronic analog signal that can
be used by a controller, indicator or data logger.
Unique Features
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PCI's Ultra Low
Differential Pressure Transducer Sensor utilizes a glass-clad
silicon chip operating on the capacitance principal. The inherent
high sensitivity of a variable capacitance sensor with the
repeatability of a micro-machined silicon diaphragm makes it ideal for
high accuracy measurement of low differential pressures. The high
level output signal, excellent long term stability, and fast dynamic
response of PCI's transducers, make them ideal for a wide range of
commercial, industrial, laboratory, and aerospace applications. |
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The Automatic
Zeroing Circuit
performs a zero calibration of the differential pressure transducer
output at user-selected intervals. Uninterrupted control and/or
indication is maintained at the last output value during the
approximately five second calibration period. The transducer resumes
its real-time analog output response after zero calibration is
complete. |
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The Signal Scaling
Circuit
converts the differential pressure signal (static pressure or velocity
pressure converted to velocity in fpm or airflow in cfm) to a
user-specified full scale value. |
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The Process Display
shows the
converted transducer output signal for local monitoring capability. |
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The Square Root
Extractor Circuits
are used in all flow transducers to conform the output to the square
root curve of velocity vs. velocity pressure. This circuit is
essential for signal accuracy when the output is made linear to
velocity or airflow. |
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The Analog Meter
is a diaphragm-actuated differential pressure gage directly connected
through bulkhead fittings and tubing to the static pressure or airflow
measuring element. This provides a continuous and direct indication
of the true measured value independent of the hydraulics or
electronics of other control components, and thus provides an instant
visual check on the system status. The meter is provided with either
a dual scale (fpm and cfm) for airflow readings or a single scale
(inches of water column) for pressure readings. The indicating scales
may also be customized for a specific design need. |
