Dwyer Series SF2 Instruction manual

Dwyer Series SF2 Instruction manual
SF2 Series Continuous Output
Brass Sight Flow Transmitter
MAINTENANCE/REPAIR
Dwyer Instruments, Inc.
Attn: Repair Department
102 Highway 212
Michigan City, IN 46360
Instruction Bulletin No. 201918
SF2 units monitor dynamic fluid flow. The rotor reacts to turbulence,
pulsation, entrained air, and other flow anomalies induced in the flow
stream by other process hardware. For optimum performance, install
SF2 units where nominal flow conditions exist, with ports located at the
top. Incoming flow may be placed to either port. A minimum of 8" of
straight pipe on the inlet side is recommended. Note: Frequency output is determined by the velocity of the monitored fluid acting on the
sensor rotor. Input piping with an orifice smaller than that of the
sensor input will affect sensor output.
8" Min.
Regular maintenance of the total system is recommended to assure sustained optimum performance. These devices are
not field repairable and should be returned to the factory if recalibration or other service is required. After first obtaining a
Returned Goods Authorization (RGA) number, send the unit freight prepaid to the following. Please include a clear description of the problem plus any application information available.
Incoming
Flow
Low Flow
Adapter
Low Flow Applications
A low flow adapter is supplied with all RotorFlow units. It is used to produce accurate response at low flow rates. Fit the adapter as
shown above, in the port selected for incoming flow. See Flow Range Chart below.
Important Points!
Product must be maintained and installed in strict accordance
with the National Electrical Code and Dwyer product catalog
and instruction bulletin. Failure to observe this warning could
result in serious injuries or damages.
For hazardous area applications involving such things as (but
not limited to) ignitable mixtures, combustible dust and
flammable materials, use an appropriate explosion-proof
enclosure or intrinsically safe interface device.
The pressure and temperature limitations shown on the
individual catalog pages and drawings for the specified flow
switches must not be exceeded. These pressures and
temperatures take into consideration possible system surge
pressures/temperatures and their frequencies.
Life expectancy of switch contacts varies with applications.
Contact Dwyer if life cycle testing is required.
Flow Range - GPM
Ambient temperature changes do affect switch set points,
since the specific gravity of a liquid can vary with temperature.
Flow switches have been designed to resist shock and vibration;
however, shock and vibration should be minimized.
Filter liquid media containing particulate and/or debris to
ensure the proper operation of our products.
Electrical entries and mounting points in an enclosed tank
may require liquid/vapor sealing.
Standard
Low Flow
Port Size
NPT
Model
No.
High
Range
Low
Range
.25"
SF2-204
0.5 - 5.0
0.1 - 1.0
.50"
SF2-214
4.0 - 20.0
1.5 - 12.0
.75"
SF2-224
3.0 - 30.0
N/A
1.0"
SF2-234
5.0 - 60.0
N/A
Flow switches must not be field-repaired.
Selection of materials for compatibility with the media is critical
to the life and operation of Dwyer flow switches. Take care in
the proper selection of materials of construction, particularly
wetted materials.
Physical damage sustained by the product may render it
unserviceable.
WARNING
When determining chemical compatibility of materials of construction, the flow media
and application-associated environmental conditions should be carefully considered.
Installation
SF2 units connect to piping via NPT mating thread forms. The following guidelines are provided to assist with installation
for a leak-free seal, without damage to the unit:
1)
2)
3)
4)
Apply pipe thread sealant to male pipe threads.
Thread RotorFlow unit onto male pipe thread until hand-tight.
Tighten pipe 1 to 1-1/2 additional turns.
If improper seal results, continue turning pipe into unit in 1/4 turn increments.
Recommended Pipe Sealants: (a) Permatex ® "No More Leaks" (b) Teflon® Thread Tape.
DWYER INSTRUMENTS,INC.
P.O.BOX 373 MICHIGAN CITY, INDIANA 46361, U.S.A.
Phone: 219/879-8000
Fax: 219/872-9057
Lit-By Fax: 888/891-4963
www.dwyer-inst.com
e-mail: [email protected]
Filtration and Cleaning: 150 micron filtration is recommended. However, should foreign particles enter the RotorFlow
Panel Mounting
sensor, accumulation is easily cleared by removing the lens from the body. The lens is removed by turning its center rib
45° counter-clockwise and then pulling it out. To reinstall the lens, simply reverse the process. Pressure must be relieved
from the system prior to sensor clean-out.
Any RotorFlow sensor may be panel mounted using holes integrated into the bodies:
Two (2) mounting holes are provided on the body centerline, as shown below.
#8-32UNC-2B screws are required for mounting.
Signal Output: Output signal is an on/off pulse of the DC voltage supplied to the unit. It is compatible with all
digital logic families. Input voltage range is 4.5 to 24 VDC. Frequency of the output pulse is proportional to the
flow rate and ranges from approximately 15 Hz at low flow to 225 Hz at high flow. See example below:
3.94"
2.50"
Low Flow
12
+VDC
0
3.06"
TIME
2.5"
1/4" & 1/2"
3/4" & 1"
High Flow
12
+VDC
Specifications
0
TIME
Note: Consult Factory for flow
rate/frequency curves.
Wetted Materials
Body
Rotor Pin
Electrical Data: Input power and output are connected via a multi-conductor, PVC-jacketed 24" cable. Color
codes are shown below:
Brass
Ceramic
Rotor
PPS/Teflon Composite; Black
Lens
Polysulfone
O-Ring
Operating Pressure, Max.
Buna N or Viton
200 PSIG at 70°F/80 PSIG @ 212°F
Operating Temperature, Max.
4.5 VDC to24 VDC (Max)
Brass Body
212°F (100°C)
Electronics
150°F (65.5°C) - Ambient
Viscosity, Max.
+VDC
Red
Ground
Black
Signal Output
White
Input Power
Output Signal
Current Source Output, Max.
Frequency Output Range
Electrical Termination
200 SSU
4.5 to 24 VDC/12mA
Frequency Pulses -Proportional to Flow Rate
70mA (Max)
~15 Hz to 225 Hz
Red (+) VDC, Black (-) Ground, White - Signal Output
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