set point - ON/OFF adjustment 0.25 to 10 ft/sec
(0.076 to 3 m/sec)
failsafe mode - switch selectable
indication - relays and signal strength LED's
sensitivity - adjustable
time delay - adjustable, 0-60 seconds
power input - 120VAC 50/60Hz
electrical surge protection
1 manual - Installation and Operation
DOPPLER FLOW SWITCH SPECIFICATIONS
SCOPE: This specification covers a non-intrusive, ultrasonic
Doppler-type flow switch as manufactured by Greyline Instruments
Inc., Massena, New York / Long Sault, Ontario. The instrument
shall provide for flow control at adjustable flow velocities.
A. PERFORMANCE SPECIFICATIONS
The flow switch shall operate with a strap-on flow sensor
mounted externally on carbon steel, stainless steel,
ductile iron, copper, FRP, PVC, ABS, or cement lined
pipe, and on liquids with entrained particles or gases of
100 microns or larger and minimum concentrations of 75
ppm.
The control ON and OFF set-points shall be independently
adjustable for flow rates between 0.25 ft/sec (0.076 m/sec)
and 10 ft/sec (3 m/sec), in pipes 1/2" (12.5 mm) ID or larger.
B. TRANSDUCER (SENSING ELEMENT)
The flow sensor shall be single-head, ultrasonic in a
stainless steel housing. It shall be installed on the
outside of a pipe without interrupting flow. The sensor
shall be capable of continuous operation at temperatures
from -40°F to 200°F (-40°C to 93°C), and to withstand
accidental submersion pressures to 10 psi. Manufacturer's
recommended coupling compound and stainless steel pipe
clamp shall be included.
Shall include 20 ft (6m) shielded coaxial cable pair with
waterproof, potted bond to the Sensor head.
Shall be capable of extending sensor cable up to 500 ft
(152m), without adjustment, and with no reduction in
performance or signal strength.
Shall be designed for Maximum RFI rejection, and include
automatic high voltage bleeds for nearby lightning
strikes.
C. ELECTRONICS/CONTROLLER
Shall include one 5 ampere DPDT control relay with
separate ON/OFF set points individually adjustable
between 1 and 10 ft/sec (0.3 to 3 m/sec).
Shall be housed in a wall-mount watertight, dust tight
NEMA4X (IP 66) fiberglass enclosure with a gasketed
shatter proof window.
The controller shall include separate dial adjustments
for sensitivity and for damping.
The controller shall include a signal strength LED light
to indicate Doppler signal threshold, and a relay LED
light to indicate relay status.
The controller shall include relay time delay ON and OFF
adjustment from 0 to 60 seconds.
The controller shall include switch selectable Normal and
Failsafe operating modes.
The flow switch electronics/controller shall operate at
temperatures from -5° to 140°F (-20° to 60°C).
D. OPTIONAL FEATURES FOR INSERTION IN SPECIFICATION AS
REQUIRED
Sensor, connecting cable and junction boxes shall be
rated intrinsically safe to Class I,II,III, Div. I,II,
Groups C,D,E,F,G.
Have a High Temperature Sensor for operating temperatures
from -40° to 302°F (-40° to 150°C)
Have a power input of 220-240VAC 50/60Hz.
Have a power input of 24VDC.
Have 50 ft (15 m) length shielded coaxial
pair sensor cable.
Have a Cable Junction Box and up to 500 ft (152m) extra
Sensor cable that shall be shielded coaxial pair
installed in conduit for mechanical protection.
E. MANUFACTURER
The flow switch shall be a Model DFS-II Doppler Flow Switch as
manufactured by Greyline Instruments Inc., and warranted against
defects in materials and workmanship for one year.
Specifications are subject to change without
notice.
Please contact Greyline if you need more
information or for advice in your application. We can provide quotations and
refer you to the Greyline sales representative in your area. (To receive
complete information please provide your name, mailing address, phone and
fax numbers):
Canada: