Control Flow From Outside a Pipe
Flow Switch with SensorNon-Contacting
Doppler Flow
Switch
Model DFS 5.1
Controls Flow with:
No pressure drop
No sensor fouling
No maintenance
Installs in Minutes
No moving parts
Ideal for "difficult" liquids
No contact, No maintenance
Easy Calibration
Clamp-on Flow Sensor
Installs without cutting the pipe
Mount the DFS 5.1 ultrasonic sensor on the outside of metal or
plastic pipes. The sensor continuously injects high frequency
sound through the pipe wall and into the moving fluid where
acoustic pulses are reflected back to the sensor from particles or
bubbles in the fluid.
Flow rates of most liquids can be accurately controlled including
acids, caustics, lubrication fluids, chemicals, abrasives, waste
water and sludge. There are no moving parts and no sensor
maintenance is required.
The compact, water tight electronics enclosure includes adjustable
controls with separate ON and OFF relay set-points and time delay.
A LED bargraph for flow rate and set points plus relay status are
included.
Installation can be made while the flow system is in full operation.
No contact is made with the moving fluid and no holes are drilled in
the pipe. There is no fouling or scale build-up on the sensor.
Non-Contacting Flow Control
Pump protection … High or Low flow control
Overfill alarm … Bargraph flow rate indication
Each DFS 5.1 Flow
Switch Includes:
!
Adjustable ON and
OFF relay setpoints
!
Adjustable time delay
!
Flow rate bargraph
!
Relay LED
Install in these
Applications:
] Sewage
] Viscous liquids
] Acids
] Slurries
] Solvents
] Treated wastewater
No pipe cutting, No pressure drop,
No sensor fouling, No maintenance!
It takes just a few minutes to install and calibrate a DFS 5.1 Flow Switch. The
DFS 5.1 controls flow of most liquids in closed pipes. The ultrasonic sensor
mounts on the outside of any pipe from 1/2" to 180" (12.5 mm to 4.5 m) I.D.
Easy to Calibrate
The DFS 5.1 control relay can
be set to turn ON and
OFF at any flow rate
between 0.25 and 10
ft/sec (0.075 to 3
m/sec). Insert two
links for separate
ON/OFF set points or
just one link for a Hi or
Lo flow alarm. Set relay
actuation time delay
from 0 to 80 seconds.
Ideal for Pump Protection
Avoid expensive pump repairs and downtime. The DFS 5.1 strap-on Sensor can
be installed in minutes without shutting down flow or cutting pipe. Use the
adjustable relay time delay to eliminate relay "chatter" and reduce pump wear.
] Sludge
] Pulp stock
] Food products
] Oils
Reliable and Repeatable
Repeatability is ±0.1% of full scale (0.1 ft/sec or 0.003 m/sec). There are no
moving parts and no maintenance is required.
The clamp-on ultrasonic sensor cannot be damaged or fouled by contact with the
liquid it measures. Sealed in a stainless steel housing, the DFS 5.1 sensor
withstands moisture or accidental submersion in water up to 10 psi (69 Kpa).
] Paint
] Chemicals
] Aerated Water
] Cooling Water
Designed for "difficult" liquids
The DFS 5.1 Doppler Flow Switch is recommended for flow
control of liquids containing gas bubbles or solids: chemicals,
slurries, sewage, sludge, viscous liquids, wastewater, caustics
and abrasives. The ultrasonic sensor injects high frequency
sound through the pipe wall into the flowing liquid. Acoustic
pulses are continuously reflected back to the sensor and the
DFS 5.1 measures a frequency shift to calculate flow velocity.
Self-tunes to Extended Sensor Cable
Up to 500 ft (150 m) extra sensor coaxial cable can be added. Extended cable
and junction box can be ordered from Greyline. The cable can be cut or extended
as required during installation. The flow switch automatically tunes to the cable
length. No circuit adjustment or calibration is required
SENSOR
BUBBLES OR SOLIDS
REFLECT SOUND
SOUND WAVES
REFLECTED
BACK TO SENSOR
SOUND WAVE
TRANSMITTED
FROM SENSOR
DFS 5.1 Specifications
General
Standard Features
Options
Greyline DFS 5.1 Doppler Flow Switch
Shipping Weight: 8 lbs (3.6kg)
Enclosure: watertight, dust tight NEMA4X (IP 67) polycarbonate with a clear shatter-proof face
Power Input: 100-240VAC 50-60Hz (±10%), 2 Watts
Control Relay: 5 ampere DPDT
Set Points: ON/OFF adjustment from 0.25 to 10 ft/sec (0.075 to 3 m/sec)
Sensor: single-head ultrasonic with 20 ft (6m) shielded cable
Pipe Size: Any pipe ID from ½" to 180" (12.5 mm to 4.5 m)
Sensor Operating Temperature: -40° to 300°F (-40° to 150°C)
Electronics Operating Temperature: -10° to 140°F (-23° to 60°C)
Accuracy: ±2%, requires solids or bubbles minimum size of 100 microns, minimum
concentration 75 ppm. Repeatability: ±0.1%
Set-point: field-adjustable with separate ON/OFF set-points or select Hi flow alarm
or Lo flow alarm mode
Indication: flow rate LED bargraph, relay status LED
Time Delay: adjustable 0 to 80 seconds
Electrical Surge Protection: AC power input and sensor
Sensor mounting bracket, clamp and coupling compound included
Sensor Cable: up to 500 ft (150 m) shielded coaxial pair with cable Junction Box
Sensor mounting clamp: stainless steel, adjustable
Power input: 12-24 VDC (±10%), 3W Max
Applications
Dimensions
1.5”
END
38 mm
VIEW
1.375”
35 mm
SIDE VIEW
3.375” / 85 mm
+
Recommended for liquids containing suspended solids or bubbles minimum size of 100
microns, minimum concentration 75 ppm
+
Sensor mounts on Vertical or Horizontal pipes.
+
Sensor Mounting Location:
6-10 pipe diameters from elbows, tees (turbulence increasing devices)
>30 pipe diameters from pumps, controlling valves and pipe discharge
+
Pipe Materials: steel, stainless steel, cast iron, PVC, fiberglass, any contiguous pipe
material that conducts sound, including lined pipes with liner bonded to pipe wall. Avoid
pipes with loose insertion liners and pipe materials which contain air pockets (concrete,
wood etc.)
3.54 in
90 mm
20 ft / 6 m
Mounting
4.2 in
107 mm
DFS 5.1
FLOW SWITCH
4.72 in
120 mm
SE4 ULTRASONIC
DOPPLER SENSOR
Mounting
2.24 in / 57 mm
FACE VIEW
2.42 in
61.5 mm
SIDE VIEW
ENCLOSURE
Easy-to-install, Automatic Flow Control
Recommended for Pump Protection and Flow Alarms
Greyline DFS 5.1 Doppler Flow Switch
The DFS 5.1 flow sensor installs without cutting the pipe. It takes just a few minutes to
mount on the outside of any pipe. The switch/electronics enclosure can be mounted
20 ft (6 m) away from the sensor (optional up to 500 ft / 152 m) to simplify wiring to
pumps, alarms, valves or other equipment.
Switch adjustments and electrical connections are fast and easy. The DFS 5.1 relay
time delay is adjustable from 0 to 80 seconds to prevent nuisance alarms and relay
"chatter" in turbulent flow. Includes switch selectable "normal" and "failsafe" operating
modes.
Choose the DFS 5.1 Flow Switch for:
] No contact with the measured liquid
] No obstruction to flow - No pressure drop
] Sensor mounts easily on the outside of the pipe
] Can be installed while pipe line is in use
] Insensitive to pressure, specific gravity and conductivity
DFS 5.1 Doppler
Sensor with
Pipe Clamp
] Does not require pipe metering sections
] Does not require consideration of material compatibility with the liquid
How to Order
Applications Support
No Risk Appraisal
The Greyline
Guarantee
Repeatable, Reliable Flow Control
Use the DFS 5.1 for pump protection, valve control and flow/no-flow alarms. It is ideal
for "difficult" liquids like wastewater, slurries, abrasives and chemicals, or any liquid
which contains gas bubbles or solids. The standard Sensor mounts on any pipe 1/2"
(12.5 mm) diameter or larger.
Contact a Greyline sales representative in your area or phone one of our sales
engineers. Describe your requirements and receive our prompt quotation.
Take advantage of Greyline's applications experience. Phone toll free 1-888-473-9546
for advice and information on applications, installation or service for Greyline
instruments.
The Greyline DFS 5.1 Doppler Flow Switch must meet your requirements. Discuss
your application with a Greyline representative to arrange a 30-day trial.
Quality of Materials and Workmanship - Each instrument manufactured by Greyline is
warranted against defects in materials and workmanship for a period of one year from
date of purchase. Refer to our limited warranty included with each product.
Canada: 16456 Sixsmith Dr., Long Sault, Ont. K0C 1P0
Tel: 613-938-8956 / 888-473-9546 Fax: 613-938-4857
USA: 105 Water Street, Massena NY 13662
Tel: 315-788-9500 / 888-473-9546 Fax: 315-764-0419
Internet: www.greyline.com E-mail: info@greyline.com
RELIABLE MEASUREMENT AND CONTROL
Loading...