F261 Series Fluid Flow Switches Product Bulletin
2
Application
Standard Flow Switches
Use F261 Series Standard Flow Switches in
applications with fluid pressures up to 290 psig
(20 bar). A typical application for a standard F261 flow
switch is to shut down the refrigeration compressor on
a fluid chiller system if flow stops, reducing chances of
chiller freeze-ups.
Type 3R (NEMA) / IP43 Enclosures
Use models with Type 3R (NEMA) / IP43 enclosures
for indoor or outdoor applications where they are
protected from weather and splashing water. Use these
models with pipes carrying fluids at temperatures in the
range of -20°F to 250°F (-29°C to 121°C). A drain hole
allows Type 3R (NEMA) models to be used in
applications where the fluid temperature is below the
ambient dew point temperature. The drain hole
knockout is plugged on IP43 models to prevent the
intrusion of objects 1 mm Ø and greater. Removing the
plug reduces the enclosure rating to IP23, allowing
these models to be used in applications where the fluid
temperature is below the ambient dew point
temperature. Do not use these models in applications
or environments where the temperature may cause the
fluid to freeze.
Type 4 (NEMA) / IP67 Enclosures
Use models with Type 4 (NEMA) enclosures for indoor
or outdoor applications in high humidity environments.
Use these models with pipes carrying fluids at
temperatures in the range of -20°F to 250°F (-29°C to
121°C). A sealing O-ring between the cover and case
allows these models to be used in high-humidity
environments, or applications where the fluid
temperature is below the ambient dew point
temperature. Do not use these models in applications
or environments where the temperature may cause the
fluid to freeze.
Media Compatibility
F261 Series Flow Switches are compatible with several
common media:
•
water
•
ethylene glycol
•
brine
•
sea water
•
swimming pool water
•
lubricating oils
IMPORTANT:
All F261 Series Flow Switches are
intended to control equipment under normal
operating conditions. Where failure or malfunction of
an F261 Flow Switch could lead to an abnormal
operating condition that could cause personal injury
or damage to the equipment or other property, other
devices (limit or safety controls) or systems (alarm
or supervisory) intended to warn of, or protect
against, failure or malfunction of the F261 Flow
Switch must be incorporated into and maintained as
part of the control system.
IMPORTANT:
Do not install or use this F261 Series
Flow Switch in or near environments where
corrosive substances or vapors could be present.
Exposure of the F261 Series Flow Switch to
corrosive environments may damage the device’s
internal components and will void the warranty.
IMPORTANT:
Do not use F261 Series Flow
Switches where the fluid in the pipes drops below
the fluid’s freezing point, causing an internal
freeze-up.
