F -2
FLOW SENSORS – ELECTRONIC
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.80
˝
(20.3 mm)
2.38˝ (60.5 mm)
.80
˝
(20.3 mm)
4.50˝ (114.3 mm)
3.06˝ (77.7 mm)
2.50˝ (63.5 mm)
.64˝ (16.3 mm)
2.37˝
(60.2 mm)
1/4˝ PORTS = .80˝ (20.3 mm)
1/2˝ PORTS = .87˝ (22.1 mm)
4.50˝ (114.3 mm)
3.01˝ (76.4 mm)
2.50˝ (63.5 mm)
2.32˝ (58.9 mm)
.87˝
(22.1 mm)
2.37˝
(60.2 mm)
2.50˝
(63.5 mm)
3.94˝
(100 mm)
1.06˝
(26.9 mm)
2˝
(50.8 mm)
4.76˝
(120.9 mm)
1.06˝
(26.9 mm)
Brass and Stainless Steel Bodies - .75˝ and 1.00˝ Port
Specifications
Wetted Materials
Body Brass, 316 Stainless Steel or Polypropylene
(Hydrolytically Stable, Glass Reinforced)
Rotor Pin Ceramic
Rotor PPS Composite, Black
Lens Polysulfone
O-Ring Viton® (Alloy Bodies); Buna N (Polypropylene Body)
Low Flow Adaptor Glass Reinforced Polypropylene
Operating Pressure, Maximum
Brass or Stainless Steel Body 200 PSIG (13.8 bar) @ 70°F (21°C),
100 PSIG (6.9 bar) Max. @ 212°F (100°C)1
Polypropylene Body 100 PSIG (6.9 bar) @ 70°F (21°C),
40 PSI (2.8 bar) Max. @ 180°F (82°C)
Operating Temperature,
Brass or Stainless Steel Body -20°F to 212°F (-29°C to 100°C)
Polypropylene Body -20°F to 180°F (-29°C to 82°C)
Electronics 150°F (65°C) Ambient
Viscosity, Maximum 200 SSU
Input Power 24 VDC or 115 VAC
Relay Contact Ratings (SPDT) 1 Amp, 24 VDC Resistive; 0.3 Amp, 110 VAC
Current Consumption No Load Load (Relay Energized)
24 VDC 20mA 35mA
115 VAC 45mA 95mA
Repeatability 2% Maximum Deviation
Set Point Accuracy (Factory Set) ± 5%
Set Point Differential 15% Maximum
Electrical Termination 20 AWG PVC-Jacketed, 24˝ Cable. Color Codes:
Red = +VAC/VDC, Black = Ground,
White = N.O. Contact, Brown = N.C. Contact,
Green = Common
Note:
1. Optional pulsed output available with RFS. Consult factory.
File No. E45168
Dimensions
Polypropylene Bodies
VDC VAC
Brass and Stainless Steel Bodies - .25˝ and .50˝ Port
VDC VAC
VDC
VAC
 Combines visual confirmation of flow
with dynamic, electronic switch operation
 Easy, adjustable switch point calibration:
a local LED signals when set point is reached
RotorFlow® Switches build an extra level of reliability and
protection into your equipment. By principle of operation,
the rotor cannot be deceived into indicating a positive
flow situation when no flow actually exists. Once
set to a desired actuation point, RotorFlow
will switch to a “no-flow” condition should
the rotor stop for any reason.
Typical Applications
Protect expensive electronic
equipment from coolant flow
failure on...
•Semiconductor
Processing Equipment
•Lasers•MedicalEquipment
•X-RayandOtherHighPowerTubes
•RoboticWeldingEquipment
Flow Set Point Switching – RFS Types
F-3
FLOW SENSORS – ELECTRONIC
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– Stock Items.
How To Order
Specify Part Number based on desired body material, port size and input power rating.
Body Port Size Flow Ranges – GPM Input Part
Material NPT Low Range* Standard Range Power Number
.25˝ 0.1 to 1.0 0.5 to 5.0 24 VDC 155425
Polypropylene 115 VAC 155876
.50˝ 1.5 to 12.0 4.0 to 20.0 24 VDC 155485
115 VAC 155886
.25˝ 0.1 to 1.0 0.5 to 5.0 24 VDC 156265
115 VAC 156266
.50˝ 1.5 to 12.0 4.0 to 20.0 24 VDC 156268
Brass 115 VAC 156269
.75˝ – 5.0 to 30.0 24 VDC 180395
115 VAC 180396
1.00˝ – 8.0 to 60.0 24 VDC 181688
115 VAC 181689
9/16-18** 0.1 to 1.0 0.5 to 5.0 24 VDC 165073
115 VAC 165074
Stainless 24 VDC 165077
Steel .50˝ 1.5 to 12.0 4.0 to 20.0 115 VAC 165078
24 VDC 181691
.75˝ – 5.0 to 30.0 115 VAC 181692
24 VDC 181693
1.00˝ – 8.0 to 60.0 115 VAC 181694
1/2" STRAIN
RELIEF HOLE
CABLE
OUTPUT
LED INDICATOR IS
ILLUMINATED WHEN
RELAY SWITCH IS
CLOSED. AIDS FIELD
CALIBRATION
SET POINT
ADJUSTMENT
9
6
3
00.1 .2 .3 .4 .5 .6 .7 .8 .9 1.0 2 3 4 5 10 15
12
9
6
3
00 1 2 3 4 5 10 15 20 25
1/4˝
Ports
1/4˝ Ports 1/2˝ Ports
1/2˝ Ports
Flow Rate – GPM
Flow Rate – GPM
PSI PSI
12
9
6
3
0010 20 30 40 50 60 70 80 90 110
100
3/4˝
Ports
1.0˝ Ports
Flow Rate – GPM
PSI
Switch Set Point Calibration With LED Signal (RFS Type)
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
the only tool required.
1. Adjust liquid flow in the line to the rate at which switch actuation is desired.
2. Insert screwdriver into opening on backside of housing and fit blade into the
potentiometer adjustment screw inside.
3. If LED is not illuminated, slowly turn screwdriver counterclockwise and stop as
soon as LED illuminates.
4. If LED is illuminated, turn screwdriver clockwise until LED light goes out. Then,
slowly turn screwdriver counterclockwise and stop as soon as LED illuminates.
Special Requirements:
GEMS caters to OEM needs with special configurations for potable water and
enhanced chemical capabilities. Consult factory for further details.
For higher pressure/temperature ratings, stainless face plates are available.
Consult factory.
* With use of Low Flow Adapter supplied. See Page F-8 for more information.
** Straight thread with O-ring seal.
High Resolution Black Rotor
PPS composite. Each of the six rotor
arms is magnetized. A PTFE loaded
bushing ensures long life.
Pressure Drop-Typical
Standard
Flow Range
Units
Low Flow
Range Units
High Flow
Units
RFS TYPE
F-8
FLOW SENSORS – ELECTRONIC
Visit www.GemsSensors.com for most current information.
Rotorflow® Type O-Ring
Material
in Kit
Part Numbers
Line
Size
Body
Material
RFA/RFO/
RFS RFI
1/4˝ & 1/2˝ Plastic Buna-N 155870 155872
Brass/SS Viton®167364 166267
3/4˝ & 1˝ Brass/SS Viton®182695 157187
8˝ MIN
(20 CM)
Low Flow
Adapter
Incoming
Flow
2.50˝ (63.5 mm)
2.50˝ (63.5 mm)
2.50˝ (63.5 mm)
Easy Installation and Maintenance
A proper installation will enhance RotorFlow sensor performance. Install using
standard pipe fitting tools; horizontal fluid lines are recommended. For further
installation and maintenance recommendations, refer to one of the following
instruction bulletins: RFO Types–Part Number 157258; RFI Types–Part Number
157259; RFS Types–Part Number 157261.
Since their function is to monitor dynamic fluid flow, naturally the rotor will react to
turbulence, 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 inches (20 cm) of straight pipe on the inlet
side is required. When operating in the low flow range, the supplied Low Flow Adapter
must be installed in the incoming port.
Except for straight-thread versions, RotorFlow sensors connect to piping via NPT
mating thread forms.. The use of an appropriate thread sealant is necessary to assure
a leak-tight connection. Permatex “No More Leaks®” or 2 wraps of Teflon® tape are
the only sealants recommended for GEMS flow sensors. Straight-thread versions
require an O-ring for sealing.
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 7/16˝ hex center hub 45° counter-clockwise with
a standard socket wrench. To reinstall the lens, simply reverse the process. Pressure
must be relieved from the system prior to sensor clean-out. O-rings should be
lubricated prior to re-assembly.
Low Flow Applications
A low flow adapter is supplied with all Rotorflow units. It is used to produce accurate
response at low flow rates. Install the adapter, as shown above, in the port selected
for incoming flow.
RotorFlow® Sensor Special Capabilities
are Yours for the Asking.
Gems caters to OEM needs with special configurations
that go beyond the standards in this catalog. We can
provide RotorFlow sensors with enhanced chemical
compatibility, higher temperature and pressure
capabilities, and alternate electrical terminations.
Other Capabilities Available to OEMs:
• Electricaloutputs:Combinedswitchandfrequency;
transistor switching; 0-10 VDC analog.
• Customfaceplate
(cast stainless steel
face plate pictured)
Panel Mounting
Plastic Bodies. Two (2) mounting ears are provided
at the body center line to receive #8 self-tapping
screws to accommodate panel mounting of the plastic
RotorFlow units. Note: ANSI T type 23 self-tapping
screws are recommended. They may be replaced with
standard machine screws if re-installation should be
required.
Brass and Stainless Steel Bodies. Two (2) mounting
holes are provided on the body centerline, as shown
below. #8-32UNC-2B screws are required for mounting.
RotorFlow® Maintenance Kits
Rebuild your RotorFlow® Sensors and Switches in less
than 5 minutes with one of these kits.
Includes:
• CeramicRotorPin
• 6-PoleMagneticRotorwithPPS/PTFEBushing
• BunaNorViton® O-Ring
• PolysulfoneLens
– Stock Items.
Polysulfone, Stainless Steel
or Polypropylene Lens
Buna N, Viton, EPDM,
Silicon or Other Material
O-Rings
PPS Composite
with Teflon® or Nylon
Loaded Bushing
Panel Mounting
Tabs
Long-Life
Ceramic
Rotor Pin
Hydrolytically Stable
Polypropylene, Stainless
Steel or Brass
We are committed to providing our customers with the
product that best meets the requirements of their
applications. Please call us and tell us what you need,
and ask us about Swagelok® tube fittings, faceplate
options, and 9/16˝ and 3/4˝ straight-thread versions.
Call 800-378-1600
RF-2500 Sensors