Atec GE-Sensing-Tech-PT878 - Manual (Page 3)

Optional Energy Measurement
The TransPort PT878 flowmeter combines proven
ultrasonic flow measurement with precise RTD
temperature measurement to determine the energy
flow rate in liquid heating and cooling systems. With
this option, the TransPort flowmeter comes equipped
with a built-in power supply for loop-powered
RTD temperature sensors, as well as all necessary
circuitry and software to make energy flow rate
measurements. The energy kit option includes two
matched Pt1000 surface mount RTDs with 30 feet of
cable to plug into the PT878,
Optional Pipe Wall Thickness Gauge
Transducer
Pipe wall thickness is a critical parameter used
by the TransPort flowmeter for clamp-on flow
measurements. The thickness-gauge option allows
accurate wall thickness measurement from outside
the pipe.
Infrared Port
The TransPort PT878 contains an infrared port
for communication with your PC. If your laptop or
desktop PC does not have infrared capability, an
adapter is available that can be plugged into your
PC’s serial port.
Optional Infrared Thermal Printer
and Accessories
When you need a permanent record of your work,
live measurements, logged data and site parameters
can be sent to a variety of printers by beaming data
directly from the TransPort PT878’s infrared port. A
compact, lightweight, hand-held, infrared thermal
printer is available. This printer is powered by a
lithium ion battery.
Built to Be Economical and Stay
Economical
To be of real value, a portable flowmeter must be as
economical to own and operate as it is capable in the
field. The TransPort PT878 flowmeter is built to stay
in service for many years. Completely solid state, the
device rarely wears out or needs servicing, resulting in
little downtime and low maintenance costs.
The TransPort PT878 Flowmeter Uses
the Transit-Time Flow Measurement
Technique
In this method, two transducers serve as both
ultrasonic-signal generators and receivers.
When mounted on a pipe, they are in acoustic
communication with each other, meaning that the
second transducer can receive ultrasonic signals
transmitted by the first transducer and vice versa.
In operation, each transducer functions as a
transmitter, generating a certain number of acoustic
pulses, and then as a receiver for an identical number
of pulses.
The time interval between transmission and reception
of the ultrasonic signals is measured in both
directions. When the liquid in the pipe is not flowing,
the transit-time downstream equals the transit-time
upstream. When the liquid is flowing, the transit-time
downstream is less than the transit-time upstream.
The difference between the downstream and
upstream transit times is proportional to the velocity
of the flowing liquid, and its sign indicates the
direction of flow.
Ultrasonic Signal Path
Flowmeter Transducers
Fluid
Flow
Transit-time flow measurement technique