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I N S T A L L A T I O N & O P E R A T I O N
Thank you for purchasing a
quality product manufactured by
Monitor Technologies LLC. We
realize that you do have a choice
of vendors when procuring flow
sensors and we sincerely
appreciate your business.
This manual contains the
information necessary to ensure
a safe and successful installa-
tion. Please read and comply with
the section on pages 7 & 8 of this
manual pertaining to SAFETY.
Doing so will ensure proper
operation of the equipment and
the safety of all personnel.
In the event that information con-
tained herein does not complete-
ly satisfy your requirements or
answer your questions, you may
contact Technical Support on our
website www.monitortech.com,
by telephone at 800-766-6486
(630-365-9403), or by fax at
630-365-5646. If your SFD-2 ever requires service either in or out
of warranty, please contact us and obtain an RMA number prior to
shipping the unit to us.
Monitor's SFD-2 Microwave Solids Flow Detector is a high qual-
ity, industrial grade instrument capable of providing a signal indi-
cating flow/no-flow conditions of solids and powders in pneumat-
ic pipelines, gravity chutes and feeders. This non-contact detec-
tor contains no moving parts or probes that can wear out or
break off in the material flow, thus ensuring process integrity.
The SFD-2 uses low power microwaves to sense motion within
the vessel or channel being monitored. Microwave technology is
used in the SFD-2 because the microwaves are virtually unaf-
fected by heat, humidity, ambient light, pressure, vacuum, high
or low temperatures, or dust, thus providing maximum effective-
ness in industrial applications.
Every SFD-2 assembly consists of a sensor head and a remote
power supply/conditioner board. The remote board can be pur-
chased with or without a NEMA 4X fiberglass enclosure. The two
B U L L E T I N
824
SFD-2 Microwave
Solids Flow Detector
M o d e l S F D - 2
No maintenance
t
Non-contact operation
t
Non-intrusive flush mounting
t
Immune to environmental conditions
t
Dust-ignition proof design
t
signal is indicated by an output relay and LEDs. This PCB also provides
the power to drive the sensor head and is the location for control settings
such as sensitivity, hold-off delay, hold-on delay and fail-safe selection.
P R E - I N S T A L L A T I O N C O N S I D E R A T I O N S
CHOOSING THE SYSTEM LOCATION (See Figure 1)
1) Hazardous/Non-hazardous - The sensor portion of the split
architecture is designed for use in Hazardous Locations associ-
ated with combustible dusts. The location chosen must comply
with the classification listed in the specifications. The power sup-
ply/conditioner is to be used in non-hazardous environments
unless the user chooses to house the PCB in a customer sup-
plied enclosure which has the appropriate hazardous location
classifications.
2) Temperature Limits - The operational temperature limits for
the sensor and power supply/conditioner must be satisfied.
3) Accessibility - Since the sensor head usually does not need
adjustment after installation, it can be located at a remote loca-
tion not as accessible to personnel. The power supply/condi-
tioner should be located where personnel can easily access the
separate components are connect-
ed via a low-voltage 3-wire system.
PRINCIPLE OF OPERATION
The SFD-2 consists of a split archi-
tecture design incorporating a sensor
head and a separate power
supply/conditioner. The SFD-2 sen-
sor head is a microwave transceiver
(combination transmitter/receiver)
encased in a watertight aluminum
housing with a screw-on cover. A
process seal (Teflon
or Ryton
-equiv.)
®
®
acts as a transparent window through
which the microwave signal is trans-
mitted and the reflected return signal
is received. The transceiver module
generates and transmits a microwave
signal into the area where the flow is
being monitored. The reflected signal
is analyzed whereby a frequency
shift in the reflected signal caused by
material movement is decoded as a
flow condition. The resultant output is
carried
back
to
the
power
supply/conditioner PCB where the
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Summary of Contents for Nivetec BULLETIN 824A
- Page 1 B U L L E T I N I N S T A L L A T I O N & O P E R A T I O N SFD-2 Microwave Solids Flow Detector Thank you for purchasing a separate components are connect- quality product manufactured by ed via a low-voltage 3-wire system.
-
Page 2: Sensor Mounting
internal controls and where indicators can be clearly seen. The sensor and power supply/conditioner can be separated up to 2500 feet (See Electrical Installation section). Figure 1 CHOOSING THE SENSOR LOCATION (See Figure 2) 1) Pipe/Chute Material - Microwave energy is contained and channeled by metallic pipes or chutes. - Page 3 Figure 5 Food Grade Adapter - (See Figure 6) In applications where Figure 3 mounting threads are not permitted, a food grade adapter with Saddle Coupling - (See Figure 4) In cases where the SFD-2 an 2" industry standard TRI-CLOVER or Cherry Burrell type ®...
- Page 4 POWER SUPPLY/CONDITIONER MOUNTING E L E C T R I C A L I N S T A L L A T I O N PCB Only - (See Figure 8) Carefully handle the PCB so as not to damage components or to create an electrostatic discharge 1) Sensor to Power Supply/Conditioner - (See Figure 10) (ESD).
-
Page 5: Sensor Indicators
2) Material Density in the Pipe/Chute - As more product is C A L I B R A T I O N placed in motion, the amount of disturbance which is analyzed as motion also increases. Thus, applications which have signif- SENSOR (See Figure 11) icant material flow can tolerate a lower sensitivity setting then Coarse Sensitivity - The coarse sensitivity is a slide switch... - Page 6 Hold-off Time Delay - The single-turn adjustment controls the 3) Red LED (and external indicator) - The Red LED indicates the amount of time that motion must be sensed before the SFD-2 will condition of the output relay. Illumination of the red LED indi- change from its “no-motion/no-flow”...
- Page 7 This device complies with RSS-210 of Industry Canada. Operation is subject to the following two conditions: - This device may not cause interference. - This device must accept any interference, including interference that may cause undesired operation of the device. M E C H A N I C A L S Locknut Sensor...
- Page 8 S P E C I F I C A T I O N S B U L L E T I N SENSOR Enclosure cast aluminum, polyester coated (beige) Enclosure protection NEMA 4, IP66 Operational temp. range -40 to +185 degrees F (-40 to +85 degrees C) Process temp.