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PRODUCTS » Flow Meters
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PRINCIPLE OF OPERATION
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Ultrasonic Doppler
flow meters operate by transmitting and receiving
ultrasonic sound signals in liquids. An instrument,
such as the DMDF1, incorporates dual transducers
that are clamped on opposite sides of a liquid filled
pipe. Each transducer contains a piezoelectric crystal.
Referring to the above illustration, the ?1 transducer
transmits an ultrasonic signal through the pipe
wall into the liquid. A portion of this signal is
reflected by suspended solids, entrained gases or
flow turbulence moving with the fluid, back toward
the second transducer, ?2, Electronic circuitry
compares the transmitted frequency with the received
frequency.
The difference, or frequency shift, is proportional
to fluid velocity, in accordance with principles
developed by Christian Johann Doppler. If the liquid
is not moving (a zero flow condition) the transmitted
and received frequencies are identical.
The DMDF3 features advanced signal processing and
an exclusive auto-adapting digital filter to produce
accurate and stable indications of flow rate and
totalized flows. A full function keypad allows field
configuration of pipe size, engineering units, the
4-20mA output and all operating parameters. |
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FEATURES |
- The system can be field configured to pipe
sizes ranging from 1 to 120 inches [25 to 3050
mm].
- Non-fouling transducer is immune to build-up
of grease, paraffin and other coating materials.
- Solid-state measurement never requires re-calibration
and is virtually maintenance-free.
- Operates with relatively clean liquids as
well as liquids with concentrations of suspended
solids or aeration.
- Does not require long straight runs of pipe.
- Rugged NEMA 4X design permits extended outdoor
and rough service use.
- Industry standard outputs allow direct interface
to loggers and controls systems.
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DFM-IV DOPPLER FLOW
METER SPECIFICATIONS |
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SPECIFICATIONS |
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| Flow
Rate Range : |
0.25 to 40 ft/sec
(0.08 to 12.2m/sec) in most applications |
| Pipe Size : |
Any pipe ID from
½" to 180º(12.7mm to 4.5m) |
| Accuracy
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±2% of full
scale. Requires solids or bubbles minimum size of
100microns, minimum concentration 75ppm. |
| Repeatability : |
±1% linearity,
±0.5% of full scale |
| Displays
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flow rate - large
4 digit LCD in programmable engineering units. Totalizer/Menu/status/Signal
Strength -16-digit LCD, alphanumeric. |
| Calibration : |
built-in 3-key calibrator.
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| No-drift transmitter
: |
Quartz crystal frequency
reference |
| Power
Input : |
100-130VAC 50-60Hz(See
Options), 5 watts maximum / built-in Battery with
Internal Charger |
| Output : |
isolated 4-20mA(1000
ohm load max) |
| Control
Relays : |
Qty 3 rated 5 amp
SPDT Programmable flow alarm and/or proportional
pulse |
| Back
Flow Rejection : |
Forces display and
outputs to zero with contact closure from remote
relay |
| Enclosure
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water tight, dust
tight NEMA4X(ip 66) fibreglass with a Clear shatter-proof
face |
| Electronics Operating
Temperature : |
-10º to 140º
F(-23º to 60º C) |
| Sensitivity : |
adjustable |
| Damping : |
adjustable |
| Electrical Surge
Protection : |
Sensor, 4 - 20mA
output and AC power input |
| Shipping Weight : |
12 lbs(5kg) |
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SENSORS |
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| Model SE3 single-head
ultrasonic with 20 ft(6m) sheilded cable and stainless
steel mounting kit for pipes ½* (12.7 mm)
ID or larger. Designed to withstand accidental submersion
to 10 psi(non-functional while submerged). |
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| Sensor
Operating Temperature : |
-40°
to 200°F(-40° to 93°C) |
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OPTIONS |
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| Sensor
A: |
Intrinsic
safety barriers for sensor mounting in hazardous
Locations. SE3H high temperature model rated upto
302ºF(150ºC) |
| Sensor
B: |
Use
the Insertion Sensor and Doppler Flow Meter when
the pipe material prevents transmission of Ultrasonic
Signal throught the pipe wall.
Pipe Diameter: 2" to 48" |
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Sensor C: |
PDSE-5
Dual Head Doppler Sensor |
| Sensor
Cable : |
50 ft(15m) continuous
shielded coaxial pair, or splice upto 500 ft (152m)
with junction box. Self tunes to extended cable |
| Enclosure
Heater : |
for outdoor installation,
16 watt thermostatically controlled to -40º
F(-40ºC) |
| Data
Logger : |
Built-in 50,000 point
logger with RS232 output and Windows Software |
| Power
Input : |
200-260VAC 50-60Hz,
24VDC or 12VDC (Battery Power) |
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APPLICATIONS |
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- Wastewater sludges
- Ground water
- Flow surveying
- Remote field site flow tests
- Used as a flow prover to other flow technologies
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- Mining recirculate
- Pump output verifications
- Sewage lifting station
monitoring
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ULTRASONIC - TRANSIT
TYPE |
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HOW IT WORKS
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The PORTAFLOW is
a Transit Time Ultrasonic flow meter. It measures
flow by injecting sound from a transmitting sensor,
through the pipe wall into the following liquid
and then to a receiving sensor. The elapsed time
between transmitted and received signals is very
precisely calculated by the flow meter.
Then the sensors trade functions. The original receiving
sensor function now becomes the transmitting sensor
and the ultrasonic signal is transmitted in the
opposite direction. Again the elapsed time between
transmitted and received signals is calculated.
The transit time in the direction of flow is faster
than the transit time against the flow. By comparing
these time differences the PORTSFLOW is able to
accurately calculate the flow rate. Because the
ultrasonic signal is forcedto cross the pipe, an
average of the flow profile is calculated. So compensation
for laminar or turbulent flow is automatic.
The Portaflow Transit Time flow meter is designed
for clean, non-aerated liquids(<2% of Volume).
High concentrations of solids or gas bubbles will
attenuate the ultrasonic signal or sound will not
be able to cross the pipe. A Greyline Doppler-type
flow meter is recommended for applications with
solids or bubbles (eg. Waste water or slurries).
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FEATURES |
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- Cost effective and versatile
- High accuracy, better than 1.0% read
- Noninvasive, no moving parts, no pressure drop,
no maintenance
- Easy and economical installation, no pipe cutting
- Wide measurement range, 0.03~40ft/s (0.01~12m/s)
- Wide pipe size range, 3/ 4~180 inches (DN 20~4570mm)
- Suitable for all commonly used pipe materials
- Signal quality tracking and self-adjusting capabilities
- automatically match transducer to pipe materials
- Velocity, volumetric and totalized flow display
- Bi-directional. Totalizer for net, positive and
negative flow display
- Easy to use and set up. Self-explanatory menu-driving
programming
- Rich input and output functionalities
- Ideal for both clean and opaque liquid flow measurements.
- In fact, most any liquid containing less than 5%
total suspended solids (TSS) or aeration.
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SPECIFICATIONS
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| Fluid/Application: |
Recommended for clean
liquids with less than 2% solids or gas bubbles |
| Flow Rate Range: |
0.65 to 40 ft/sec
(0.2 to 12 m/sec) |
| Pipe
Size: |
Ultrasonic sensors
mount on any pipe from 2" to 40" ID (50
mm to 1000 mm) |
| Pipe Materials: |
Any sonic conducting
material including carbon steel, stainless steel,
PVC,
PVDF, fiberglass, galvanized steel, mild steel,
glass, copper, brass and pipes
with bonded liners including epoxy, rubber and Teflon |
| Display: |
Backlit LCD matrix.
Displays flow rates in m , liters, or gallons (per
minute or
hour), and flow velocity in feet per second or meters
per second. Displays
positive and negative flow and data log files in
graphic or text modes. |
| Totalizer: |
12 digits - displays
separate forward and reverse flow totals |
| Power Inputs: |
Built-in rechargeable
NiMH battery powers the Portaflow for 6-10 hours
continuously. The external charger operates from
100-240 VAC power input |
| Outputs: |
4-20mA (750 ohm),
Serial RS232-C with adjustable baud rates for data
transfer
to a PC |
| Data Logger: |
programmable, 50,000
data point capacity, time and date stamped values
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| Electronics
Operating Temperature: |
32° to 122°F
(0° to 50°C). Storage Temperature: 14°
to 140°F (-10° to 60°C) |
| Electronics
Enclosure: |
Portable, ABS enclosure
with lockable carrying case |
| Accuracy: |
±2% of reading,
Repeatability: ±0.5%
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| Calibration: |
Built-in 16-key programming
with user-friendly calibration menu. Stores
calibration parameters for up to 20 different sites. |
| Approvals: |
CE (conforms to EN50081-1
emission and EN50082-1 immunity standards).
Charger is CE, CSA and UL approved. The Portaflow
SE is certified for use
in hazardous rated locations.
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SENSOR SPECIFICATIONS |
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| Transducer Model
PTSE1: |
Clamp-on
1 MHz ultrasonic for pipes from 2" to 40"
ID (50 mm to 1000 mm). |
| Transducer Mounting
Kit: |
Includes
stainless steel guide rail, mounting chains and
coupling compound |
| Operating
Temperature: |
-4°
to 257°F (-20° to 125°C) |
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RECOMMENDED FOR |
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- Portable water
- River water
- Cooling water
- Demineralized water
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- Water/glycol solutions
- Hydraulic oil
- Diesel and fuel oils
- Chemical
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| The PORTAFLOW SE
is ideal to measure flow rate of clean, non-aerated
fluids in full pipes. Works best on fluids that
have less than 2% particulate or gas bubbles. |
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APPLICATIONS |
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The DMTFB flow meters
are ideal for process-control or flow measurement
at fixed locations. Their non-invasive nature makes
them indispensable in applications such as chemical
liquid processing, hygienic process monitoring,
high-pressure flow measurement, etc. Benefited from
our advanced digital signal processing technology,
the flow meter works reliably in both clean and
opaque liquid flow. Examples of applicable liquids
are:
- Water, including hot water, chilled water,
city water, sea water, etc.
- Secondary sewage, waste treatment, etc.
- Oil, including lubricating oil, diesel oil,
fuel oil, etc.
- Chemicals, including alcohol, acids, etc.
- Solvents
- Beverage, food and pharmaceutical processors
where non-contact is a must.
- HVAC, energy measurement system, etc.
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