Dwyer SF - Manual

Series SF Sight Flow Transmitter
BULLETIN F-41-SF
Specifications - Installation and Operating Instructions
GENERAL
Series SF Sight Flow Transmitter integrates tangential turbine
technology with hermetically sealed circuitry to provide accu-
rate flow measurement and control in the harshest environ-
ments. The 2-wire loop-powered design transmits a 4 to 20
mA signal proportional to flow rate. Models can accurately
measure flow in both directions and can be mounted in any
orientation. Series SF Transmitters are ideal for measuring
flow rates in cooling and lubrication circuits, HVAC systems,
aggressive chemical metering, and batching systems.
MECHANICAL INSTALLATION
The Series SF Sight Flow Transmitter has a 1/2 NPT(F)
plumbing connections. It is recommended to use a paste
type pipe sealant on the threads. Teflon tape sealant can
also be used as long as it is applied so the tape does not
enter the flow stream (pieces of tape can wrap around the
turbine and impeded rotation).
The recommended mounting orientation would be any
plane that will place the axis of the turbine vertical or hori-
zontal with respect to ground. The unit will operate satis-
factory with the axis at other angles, but side loading of the
bearing surfaces will lead to premature wear of the rotating
parts.
For the best flow measurement results, place the inlet (ref-
erences to “inlet” and “outlet” refer to unidirectional sys-
tems) of the flow sensor at least 10 straight pipe diameters
downstream from any fitting, valve, elbow, reducer, etc. that
causes nonstable flow conditions. Ideally, 5 straight pipe
diameters should be placed at the outlet of the sensor. If
the sensor must be placed closer to a source of nonstable
flow than the recommended distances, some instability of
the output signal may result. The average signal will be
accurate.
Place the sensor in such a position that the round access
cover can be removed for cleaning and turbine servicing. A
union placed near the sensor is recommended to allow
easy removal.
700462-00
1/2 Љ NPT (F)
2
[50.80] 2-5/8
[66.68]
2-7/16
[61.91]
1-1/8
[28.58]
3-11/16
[93.66]
ELECTRICAL INSTALLATION
The Series SF Sight Flow Transmitter is a two-wire loop-
powered device desined to transmit a 4-20mA signal
proportional to flow rate. The noise-immune current trans-
mission from the sensor can be routed with low cost two
conductor twisted-pair cable. The current operates on 12-
35VDC and requires a source capable of supplying at least
20mA of current. The circuit has built-in polarity protection
and over-current limiting to protect both the sensor and
what the sensor is connected to.
To connect the sensor:
1. Connect the red wire from the sensor to the positive 12-
35VDC power supply output.
2. Connect the black wire from the sensor to the positive
side of the loop load (resistor, chart recorder, data aquisi-
tion board, meter, etc.). This connection may be labeled “4-
20mAInput” on some devices.
3. If applicable, connect the negative side of the loop load
to the negative side of the power supply.
Model
Cover Material
Number
SF10 316 Stainless Steel
SF11 Clear Polycarbonate
MODELS
PHYSICAL DATA
Flow Range: 0.5 to 15 GPM (2
to 60 LPM).
Accuracy: 30 Watts: 0.14A @
220VAC, 0.28A @ 110VAC,
0.07A @ 120VDC, 0.28A @
24VDC.
Temperature Range: 20 to
225°F (-7 to 107°C).
Maximum Pressure: 500 psig
(34 bar) Model SF10, 200 psig
(14 bar) Model SF11.
Repeatability: 0.5% Full Scale.
Supply Voltage: 12 to 35 VDC.
Output: 4 to 20 mA.
Loop Resistance: 1150
Ω max.
Response Time: 2 seconds to
90% (step change in flow rate).
Wetted Parts: 316 SS shaft and
case, iglide
® bearings, Buna-N ®
seal and acetal copolymer, (poly-
carbonate cover on Model
SF11).
Connections: 2
″ NPT(F).
Wire Leads: 22 AWG ϫ 9′
(2.7m).
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361 U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/982-9057 e-mail: [email protected]
Lit-by-Fax: 888/891-4963