GE PT878GC Manual De Usuario
Features and Capabilities
1-3
April 2004
System Description
The TransPort is only one part of the flowmeter system. The
other part of the system is the flowcell, which consists of the pipe
and the transducers.
other part of the system is the flowcell, which consists of the pipe
and the transducers.
The Flowcell
The flowcell is that part of the system that uses ultrasonic pulses
to interrogate the flow. It consists of the flowcell pipe and the
transducers.
to interrogate the flow. It consists of the flowcell pipe and the
transducers.
A. FLOWCELL PIPE - The flowcell can either be created in the
existing piping (for example, by clamping non-wetted
transducers onto the pipe), or inserted as a substitute pipe
section (spoolpiece). The flowcell must provide mechanical
support for the transducers and assure stable conditions for
accurate flow measurement.
transducers onto the pipe), or inserted as a substitute pipe
section (spoolpiece). The flowcell must provide mechanical
support for the transducers and assure stable conditions for
accurate flow measurement.
B. TRANSDUCERS - The transducers convert electrical energy
into ultrasonic pulses when in a transmit cycle, and convert
the ultrasonic pulses back to electrical energy when in a
receive cycle. In other words, they act like loudspeakers when
transmitting the signal and microphones when receiving it. In
the TransPort system, each transducer acts as both a receiver
and transmitter, since a series of ultrasonic pulses are
alternately sent upstream and then downstream through the
flowcell.
the ultrasonic pulses back to electrical energy when in a
receive cycle. In other words, they act like loudspeakers when
transmitting the signal and microphones when receiving it. In
the TransPort system, each transducer acts as both a receiver
and transmitter, since a series of ultrasonic pulses are
alternately sent upstream and then downstream through the
flowcell.