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Flow
FLOW SWITCHES
FLOW TRANSMITTERS
Level
POINT LEVEL
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Conductive
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Capacitive
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Vibrating Tuning Fork
CONTINUOUS LEVEL MEASUREMENT
Pressure
PRESSURE TRANSMITTERS
SUBMERSIBLE PRESSURE TRANSMITTERS
Downloads
www.Sitron.com
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Solutions for...
|Flow | Level
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FLOW SWITCHES
FLOW TRANSMITTERS
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MODELS: |
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INTRODUCTION: |
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Sitron's versatile and
intelligent line of Thermal Dispersion Flow Switch are
compact switches and transmitters, with no moving parts, that can
monitor and control the flow of liquid and gas in pipes and ducts.
They can also be used for single point level detection for
liquids. Sitron's series of flow switches and transmitters are
available in different models that provide for different power
supply, output and connection requirements.
All models are manufactured
using 316 S.S. and can be coated when necessary for aggressive
mediums. All of the CF12 and CF420 models can operate in
temperatures up to 248ºF (120ºC) and have a maximum working
pressure of 4350 PSI (300 bar). A display chain of 8 LED's is
available for all models to indicate flow rate (CF420) and to help
the set point adjustment (CF12 series). Sitron also offers the
option of sanitary connections such as Tri-Clamp as well as the
standard threaded and flanged connections. In addition, the
orientation of the enclosure can be rotated so that the LED
display can be best viewed, after the process connection has been
tightened.
Sitron's line of flow switch
monitors are highly reliable industrial instruments that provide
the durability and speed required for today's general as well as
harsh process environments for flow and level. |
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TECHNOLOGY: |
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Sitron's line of thermal flow
switch is based on the principle of thermal dispersion. A typical
configuration uses two platinum Resistance Temperature Detectors
(RTD's) set within the tip of the sensor. One RTD is heated a few
degrees above the temperature of the medium and the other RTD is
used as a reference, sensing the actual process temperature. The
second RTD also monitors the temperature of the medium, as any
changes in temperature must be compensated for in the first RTD.
As the process medium flows over
the tip of the sensor it disperses some of the heat from the first
RTD. The temperature change between the two RTDs signals the
probe's electronics and the switch changes state once the set
point has been reached. For the CF420, the microprocessor-based
electronics constantly updates and reviews the signals received,
in return putting out a 4-20mA analog output signal, which is
proportional to the flow rate. |
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FEATURES: |
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Simple to install & low in cost
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No moving parts-maintenance free reliability
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Optimal temperature compensation
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Can operate in temperatures up to 248ºF (120ºC)
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Have a maximum working pressure of 4350 PSI (300 bar)
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Choice of output signal
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Chain of 8 LED´s-Integrated flow rate/set point indication
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Fast response time for flow or level
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Excellent low flow sensitivity
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Can be coated for aggressive mediums
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Insensitive to dirt and on most particles
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Available in EX-Proof version
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Available in threaded, flange, sanitary and adjustable insertion
lenght connections
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Sitron´s CF Line of Flow Switch Monitors |
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MODELS: |
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CF 12AC
Power Supply: 85...240 VAC
Output: Relay (NO or NC) |
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The CF12AC is a thermal
flow switch designed to monitor flow status of liquids and gas and
can also be used to detect level. A chain of 8 LED's gives the
user a visual indication to help the set point adjustment. In
addition, there is also a di-chromatic LED, which shows the switch
point status of the unit.
The sensing element and
connection of the CF12AC is made with 316 S.S., can be coated when
necessary and the enclosure is glass filled nylon. The CF12AC can
be made with a great variety of process connections such as
threaded, flange, or sanitary.
For PTFE coating we recommend
that the switches are made with flanged connections.
The CF12AC flow switches come
with a NO(normally open) contact. It is necessary to specify when
a NC (normally closed) contact is needed. |
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For Dimensions and Wiring Diagram click here |
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CF 12DC
Power Supply: 24 VDC
Output: Relay (SPDT) |
The
CF12DC is a thermal flow switch designed to monitor flow
status of liquids and gas and can also be used to detect level. A
chain of 8 LED's gives the user a visual indication to help the
set point adjustment. In addition, there is also a di-chromatic
LED, which shows the switch point status of the unit.
The
sensing element and connection of the CF12DC is made with 316
S.S., can be coated when necessary and the enclosure is glass
filled nylon. The CF12DC can be made with a great variety of
process connections such as threaded, flange, or sanitary.
For PTFE coating we recommend that the switches
are made with flanged connections.
For Dimensions and Wiring Diagram click here
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PDF Download |
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The CF420 model is a flow
transmitter that measures the velocity of the flow. It is ideal for
use in measurement and control applications. The CF420 provides two
output options; a 4-20mA analog output and a PNP/NPN output. For the
4-20mA output, the electronics' module converts the signal from the
probe to a 4-20mA analog output, which can be used to indicate flow
rate. For the PNP/NPN output, the measured flow rate is compared to
the set point value selected by the user and the switch changes state
once the set point value has been achieved.
The
CF420´s microprocessor based electronics and unique self-calibration
program gives the flow transmitter superior temperature compensation,
a fast response time and increased long term switch point stability.
Even in the event of a power failure, the calibration program will
store values for maximum and minimum flows for up to 10 years.
A chain
of 8 LED's gives the user a visual indication of the flow rate as well
as set point status, and one di-chromatic LED indicates switch point
status. In addition, if there is a problem with the unit, the 8 LED's
will flash continuously providing troubleshooting information.
The
conical shape of the sensor's tip means that the probe can be
installed at almost any angle in the pipe and that if the probe is
miss-aligned, accuracy will not be affected. The sensing element and
connection of the CF420 are made with 316 S.S. and the enclosure is
glass filled nylon.
For
aggressive mediums the CF420 can be made with Hastelloy-C. We do not
coat any of the CF420 models. The CF420 can be made with a great
variety of process connections such as threaded, flange, or sanitary.
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For Dimensions and Wiring Diagram click here |
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Measuring Ranges for CF420
The
CF420's nominal measuring range is 0.04 to 2.0 m/s. The switch can be
set to trip at any value in this range. To calculate the velocity for
your application, use the following simple formula:
Q =
Flow rate in m³ per second
D = Pipe internal diameter in meters
V = Fluid velocity in meters per second
Please
note that the 4-20mA option is scaled over 0 to 2.0 m/s
If the flow rate is in gallons per minute, you can use the factor:
gpm x 0.0000631 = m³/s |
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PDF Download |
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BENEFITS |
- Flexibility - the versatility of
each offering allows Sitron to fit into most applications
- User Friendly and Low
Maintenance – Everything about Sitron products are designed to minimize operation
downtime.
- Reliable – electrical /
electronic parts protected within a sealed enclosure
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approved
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More about Sitron
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The
F420 is very similar to the CF420 with one main difference:
The sensor is separate from the eletronics and it does not have an
enclosed housing. This gives the F420 the ability to be installed
in very small pipes, and be remotely controlled by the RCF420.
The F420 is the ideal solution when there is not a lot of space to
install even a compact unit or when there is a need for a mounted
controller. In addition, the conical shape of the sensor´s tip
allows the probe to be installed at almost any angle in the pipe,
and if it is miss-aligned, accuracy will not be affected. |
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The F420
is entirely made with 316 S.S. The RCF420 controller can operate with
DC or AC supply voltage and provides an analog 4-20mA and relay (NO+NC)
output. The RCF420 enclosure is made with ABS and can be mounted on a
DIN rail or by using 2 fixing screws. |
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For Dimensions and Wiring Diagram click here |
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PDF Download |
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