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RFS-2500 Series RotorFlow P/N 157261
Rev. F
Important Points!
Product must be maintained and installed in strict accordance with
the National Electrical Code and GEMS product catalog and
instruction bulletin. Failure to observe this warning could result in
serious injuries or damages.
An appropriate explosion-proof enclosure or intrinsically safe
interface device must be used for hazardous area applications
involving such things as (but not limited to) ignitable mixtures,
combustible dust and flammable materials.
Pressure and temperature limitations shown on individual catalog
pages and drawings for the specified flow switches must not be
exceeded. These pressures and temperatures take into consider-
ation possible system surge pressures/temperatures and their
frequencies.
Selection of materials for compatibility with the media is critical to
the life and operation of GEMS flow switches. Take care in the
proper selection of materials of construction; particularly wetted
materials.
Life expectancy of switch contacts varies with applications.
Contact GEMS if life cycle testing is required.
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.
Liquid media containing particulate and/or debris should be
filtered to ensure proper operation of GEMS products.
Electrical entries and mounting points may require liquid/vapor
sealing if located in an enclosed tank.
Flow switches must not be field repaired.
Physical damaged sustained by the product may render it
unserviceable.
RFS-2500 Series
RotorFlow
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Sensors
Instruction Bulletin No. 157261
RotorFlow units monitor dynamic fluid flow. The rotor reacts to turbu-
lence, pulsation, entrained air, and other flow anomalies induced in the
flow stream by other process hardware. For optimum performance,
install RotorFlow 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.
Low Flow Applications
A low flow adapter is supplied with all RotorFlow units. It is used to produce accurate response at low flow rates. Press
fit the adapter as shown above, in the port selected for incoming flow. See Flow Range Chart below.
Installation
:
RotorFlow sensors 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) Apply pipe thread sealant to male pipe threads. 2) Thread
RotorFlow unit onto male pipe thread until hand-tight. 3) Tighten pipe 1 to 1-1/2 additional turns. 4) If improper seal results,
continue turning pipe into unit in 1/4 turn increments. Do not exceed one additional turn. Recommended Pipe Sealants:
(a) Permatex
�
"No More Leaks" (b) Teflon
�
Thread Tape.
Filtration and Cleaning
:
150 micron filtration is recommended. However, should foreign particles enter the RotorFlow
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.
**
Straight thread with
O-ring seal
Low Flow
Adapter
8" Min.
Incoming
Flow
Adapter
Part Number
Input
Power
Range
Low Flow
*
Standard
0.1 - 1.0
1.5 - 12.0
1.5 - 12.0
N/A
12 VDC
24 VDC
110 VAC
12 VDC
24 VDC
110 VAC
12 VDC
24 VDC
110 VAC
12 VDC
24 VDC
110 VAC
12 VDC
24 VDC
110 VAC
24 VDC
115 VAC
24 VDC
110 VAC
24 VDC
110 VAC
24 VDC
115 VAC
24 VDC
115 VAC
155424
155425
155876
155484
155485
155886
156264
156265
156266
156267
156268
156269
180394
180395
180396
181688
181689
165073
165074
165077
165078
181691
181692
181693
181694
152147
151832
151832
N/A
Range
0.5 - 5.0
4.0 - 20.0
0.5 - 5.0
4.0 - 20.0
3.0 - 30.0
Flow Range - GPM
5.0 - 60.0
0.5 - 5.0
4.0 to 20.0
3.0 - 30.0
5.0 - 60.0
N/A
0.1 to 1.0
1.5 to 12.0
N/A
N/A
.25"
.50"
.25"
.50"
.75"
1.0"
9/16-18
**
.50
.75
1.0
0.1 - 1.0
Body
Material
Polypropylene
Brass
316
Stainless
Steel
152147
N/A
152147
151832
N/A
N/A
Port Size
NPT
Part
Number
(For Additional Information, See Gems' "Level, Flow and Pressure Catalog)
*
With use of low flow
adapter supplied Brass, 316 SS or Polypropylene, Hydrolytically Stable, Glass-Reinforced Ceramic
PPS Composite/Teflon/PPS Composite
Polysulfone
Buna N/Viton
200 PSIG @ 70�F 80 PSIG @ 212�F
100 PSIG @ 70�F 40 PSIG @ 212�F
212�F (100�C)
180�F (82.2�C)
212�F (100�C)
150�F (65.5�C)
200 SSU
12 VDC, 24 VDC or 110 VAC
1 Amp, 24 VDC Resistive 0.3 Amp, 110 VAC
2% Maximum Deviation
�5%
15% Maximum
Wetted Materials
Body
Rotor Pin
Rotor
Lens
O-Ring
Operating Pressure, Max.
Brass Body & 316 SS Body
Polypropylene Body
Operating Temperature, Max.
Brass Body
Polypropylene Body
316 SS Body
Electronics (All Bodies)
Viscosity, Max.
Input Power
Relay Contact Ratings (SPDT)
Repeatability
Set Point Accuracy (Factory Set)
Set Point Differential
Electrical Termination
Specifications
22 AWG PVC-Jacketed, 24" Cable. Color codes: Red = +VAC/VDC;
Black = Ground; White = N.O. Contact; Brown = N.C. Contact; Green = Common.
Hydrolytically stable, glass-reinforced, Polypropylene is UL-recognized to UL746B at a
relative temperature index of 65�C
Panel Mounting
Any RotorFlow sensor may be panel mounted using holes integrated into the bodies.
Plastic Bodies
Two (2) mounting ears are provided at the body centerline to receive #8 Self- tapping screws.
(Brass and stainless steel bodies use 8-32 UNC2B screws.)
See recommended panel preparation diagram. Note: ANSI T Type 23 self-tapping screws
are recommended for plastic. They may be replaced with standard machine screws if rein-
stallation should be required.
Note
A RotorFlow Repair Kit is available, including the following replacement
parts: lens, O-ring, shaft, and rotor. Consult Factory to order.
Switch Set Point Calibration with LED Signal
With the unit installed in the line and power supplied, complete the following steps to calibrate
switch actuation point with proper flow rate. A small flat-blade screwdriver is all that is required.
1/2" Strain Relief Hole
LED Indicator Is Illuminated
When Relay Switch Is
Closed. Aids Field
Calibration.
Cable
Output
Set Point
Adjustment
1. Adjust liquid flow in the line to the
rate at which actuation is desired.
Insert screwdriver into opening on
backside of housing and fit blade into
the potentiometer adjustment screw
inside.
If LED is not illuminated, slowly turn
screwdriver counter-clockwise and
stop as soon as LED illuminates.
If LED is illuminated, turn screwdriver
clockwise until LED light goes out.
Then, slowly turn screwdriver
counter-clockwise and stop as soon
as LED illuminates.
2.
3.
4.
Plastic. Brass, Stainless Steel
1/4", 1/2", 9/16"-18
2.50"
3.06"
Brass/Stainless Steel
3/4" & 1"
3.94"
2.5"
Electrical Data
Input power and output are connected via a
multi-conductor, PVC-jacketed 24" cable.
Color codes are shown below:
+VAC/VDC
-Power
N.O. Contact
N.C. Contact
Common
Red
Black
White
Brown
Green
WARNING
When determining chemical compatibility of
materials of construction, the flow media and
application-associated environmental condi-
tions should be carefully considered.
This product is suitable for Class I and Class II applications only, per the requirements of standard EN60730
and any additional specific requirements for a particular application or medium being sensed. Class I
compliance of metal bodied units requires a ground connection between the metal body and the earthing
system of the installation. Class I compliance of plastic bodied units in contact with a conductive medium
requires that the medium be effectively earthed so as to provide an earthed barrier between the unit and
accessible areas. For Class III compliance, a supply at safety extra-low voltage (SELV) must be provided.
Please consult the Factory for compliance information on specific part numbers.