Atec Panametrics-Olympus-DF868 - Manual (Page 2)

GE
Sensing
Panametrics Ultrasonic
Liquid Flowmeter
The DigitalFlow DF868 is a full-featured, fixed-installation
liquid flowmeter designed to meet all your flow metering
and energy measurement needs. Its patented
Correlation Transit-Time™ digital signal processing
provides drift-free measurements in ultraclean and most
"dirty" liquids. This includes fluids with gas bubbles and
entrained solids that have previously required
Doppler-type meters.
Dual-LCD Display, Datalogger and a
Wide Variety of I/O Options
Whether single-channel or dual-channel, all DF868
meters feature two independent, user-programmable,
graphic LCDs, giving you simultaneous access to more
data. There is complete flexibility to display any
parameter on either LCD in a variety of numerical and
graphic formats. Examples include numerical display of
real time flow measurements, real time flow graphs and
diagnostic waveforms, and numerical/graphic display of
data from the meter's built-in 43,000 point datalogger.
Up to 12 isolated 4 to 20 mA outputs, up to six
hermetically sealed or standard alarm relays, and up to
12 frequency/totalizer outputs can be added.
Built-In Energy
Measurement Capability
Another feature that makes the DigitalFlow DF868 meter
such a powerful and versatile flowmeter, is the energy
measurement software included in every meter. The
DigitalFlow DF868, with optional RTDs and input boards,
extends the benefits of ultrasonic flow measurement to
energy measurement. Benefits include measurement of
flow and temperature without pipe penetration, and
compatibility with pipes from 1 to 200 in
(25.4 mm to 5 m) in diameter. The DigitalFlow DF868
meter measures energy flow in water and water/glycol
heating and cooling systems with temperatures from
-4°F to 410°F (-20°C to 210°C). Consult GE for use with
other liquid systems.
To ensure compatibility with existing or preferred
temperature instrumentation, the DigitalFlow DF868
meter is available with three analog input boards. The
transmitter input board provides 24 VDC loop power and
two isolated 4 to 20 mA inputs for transmitters. For
applications requiring raw RTDs, the RTD input board
provides two isolated, three-wire RTD inputs for
temperatures from -148°F to 662°F (-100°C to 350°C).
Measure Flow from Outside the Pipe
Using clamp-on flow transducers, the DigitalFlow DF868
measures flow rate through metal, plastic or even
concrete-lined pipes without penetrating the pipe wall.
To hold clamp-on transducers in place, a variety of
clamping fixtures are available to accommodate
different pipe sizes, transducer types and attachment
methods (e.g., chain, wire rope, Velcro
® strap or a
magnetic, bolt-on, or weldable steel yoke with metal
band). Our universal clamping fixture includes ruled slide
tracks to simplify transducer spacing for accurate flow
measurements. There's even a special small-pipe
clamping fixture with miniaturized transducers to
simplify flow measurement on 0.5 to 2 inch
(15 to 50 mm) lines.
Dual-Channel Version Reduces Costs
and Improves Performance
The optional dual-channel/dual-path model can be
user-configured for a variety of applications. It can be
set up to measure flow in two separate pipes with one
meter to reduce the cost-per-measurement point.
To minimize the effects of flow profile distortions, flow
swirl and cross flow, and to provide maximum accuracy,
two sets of transducers can be installed on the same
pipe.
Wetted Transducers for
Maximum Accuracy
Obstructionless wetted transducers are readily available
for maximum performance. After proper installation,
transit-time accuracies of better than 1 percent are
achievable in most applications, matching the
performance of expensive factory-calibrated meters.
Measurement range is 0.1 to 40 ft/s (0.03 to 12.2 m/s) for
a turndown ratio of 400 to 1 in pipes from 1 to over 200
inches in diameter. Measurement is noncontaminating,
obstructionless and causes no pressure drop. The
DigitalFlow DF868 is all digital so measurements don't
drift, and it doesn't need regular maintenance since
there are no moving parts to wear out or orifices to clog.