Bulletin FL-1-BFM
4x 3/4˝ CONDUIT KNOCKOUTS
5-9/64 [130.45]
TRANSFORMER
3[76.20]
6X 1/2˝ CONDUIT
KNOCKOUT
1-19/32
[40.64]
1/2
[12.69]
3/32
[2.29]
3
[76.20]
1-1/2
[38.10]
FLOW SENSOR
6´ 18 AWG
WIRE
SENSOR
TIP
PRODUCT LABEL
FOR MAIN CONTROLLER UNIT
7
[177.80]
GREEN
LED
1A FUSE
RED LED
RELAY
SENSITIVITY ADJUSTMENT
POTENTIOMETER
BFM FLOW MONITOR
Series BFM Bulk Flow Monitor
Specifications - Installation and Operating Instructions
BFM
Series BFM Bulk Flow Monitor provides effective
monitoring for most flow/no flow conditions in pipes and
chutes. It’s sensing techniques, which use a Piezo element,
makes the BFM versatile for most flow/no flow applications.
BFS
SPECIFICATIONS
BFM Specifications
Service: Solids and liquids.
Power Requirement: 120VAC, 220VAC or 12VDC.
Power Consumption: .1A.
The BFM Control offers many unique advance features
that exceed the industry standards. The BFM Central
Processing Unit monitors movement of almost anything
through a pipe or chute system. The BFM is ideal for
sensing the presence or absence of materials in Pneumatic
Conveying Systems. The BFM offers adjustable sensitivity
depending on the application demand. Also, it provides
easy installation and requires no maintenance. The unit has
L.E.D indicators – flow (green)/ no flow (red).
Temperature Limits: 120°F (48.9°C).
Output: Relay: SPDT rated 4A @ 125/250VAC, 1/10 HP
@ 125/250VAC, 3A @ 30VDC. TTL: 0-5 V.
Serial Communications: RS-232.
Electrical Connection: Screw Terminal.
Conduit Connection: Knockouts (two 3/4˝ for power,
three 1/2˝ for sensor and outputs).
Enclosure Rating: NEMA 4.
Material: Polycarbonate.
Weight: 3 lbs (1.36 kg).
The BFS-1 Sensor yields many advance features. It
externally mounts to the outside of the pipe or chute. It
provides mounting tabs for easy installation. The Sensor is
prewired with 3´ wire.
BFS Specifications
Pipe Size: 1/2˝ to 60˝ (1.27 to 152.4 cm).
Enclosure Rating: NEMA 4.
Electrical Connection: 3´ (0.9 m) of 18 gauge wire.
Series BFM has many practical applications. You can use it
to monitor Oil Spray Systems, Discharge Chutes,
Distributors, Screw Conveyors, Drag Conveyors, Water
Systems, Air Systems, Pneumatic Systems, Gravity Feed
Systems, Slurry Systems, Chemical Processing, Food
Processing and Rotary Drums.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com
Part Number
BFM-1
BFM-2
BFM-3
BFS-1
Temperature Limits: 155°F (68.3°C).
Materials: PVC Type 1 Grade 1 Grey.
Weight: 5 oz (141.8 g).
Descriptions
Control Unit: NEMA 4X, Polycarbonate Housing, Weatherproof, 120VAC
Control Unit: NEMA 4X, Polycarbonate Housing, Weatherproof, 220VAC
Control Unit: NEMA 4X, Polycarbonate Housing, Weatherproof, 12VDC
Sensor
Phone: 219/879-8000 www.dwyer-inst.com
3/4˝ HIGH
VOLTAGE INPUT
1/2˝ LOW
VOLTAGE INPUT
BFM WIRING
The BFM polycarbonate housing comes with 10 PG conduit
knockouts in the housing.
• High voltage inputs above 24 volt AC should be routed into
the housing through the 3/4˝ (20mm) conduit hole.
• All Low voltage wiring (TTL, RS232, and sensor) should be
routed through the 1/2˝ (14mm) conduit hole.
• A 1-Amp fuse is located next to the transformer .
Figure 3
Figure 1
HIGH VOLT AGE INPUTS
Connect the 120VAC, 50/60 HZ, 1 Amp supply on TB2
terminals (Fig. 2):
• 120VAC (Hot) supply to 117V AC terminal (or 12VDC, 240V AC
per the model)
• AC Common to AC COM terminal
• Earth-Ground to E GND terminal. Must connect to prevent
accidental electrical shock.
SENSOR INPUTS
Connect the low voltage Flow Sensor to the Sensor terminals
TB1 (Fig. 4):
• Positive RED (or White) sensor lead to the “+” Sensor
terminal on TB1.
• Negative BLACK sensor lead to the “-” Sensor terminal on
TB1.
The sensor wiring should be a minimum of 18 AWG stranded 2-conductor cable. Use 18 AWG for up to 500´ (155m) and
16 GA up to 2000' (620m).
• All Sensor wire splices must be SOLID and WATER TIGHT.
Figure 2
Figure 4
RELA Y AND LOW LEVEL LOGIC WIRING
SIDE VIEW FRONT VIEW
BFM
SENSOR
BFM
SENSOR
NOTE: PILOT HOLES
ARE DRILLED INTO
FLAT SURFACE AND
MOUNTED WITH
PORPER HARDWARE.
See those sections later in this manual.
SENSOR INST ALLATION
The BFS-1 sensor is in very a rugged polymer housing with a
sealed 6´ cable pigtail (Fig. 5):
• Red/Black = Positive
• White/Black = Negative (this is electrically connected to the
metal sensor stud)
BFM SENSOR
BLACK LEAD
Figure 6
MOUNTING TO A ROUND OR NON-FLAT SURFACE:
(FIG. 7)
• Using strapping (such as heavy duty wire-ties) or clamps to
secure the sensor housing to the pipe so the metal sensing
stud makes firm contact with the surface.
RED/WHITE LEAD
Figure 5
MOUNTING PROCEDURES FOR SENSOR:
The BFS-1 Sensor can be screwed, clamped or strapped in
place and is able to detect flow through most sheet metal.
• Clean the surface area where the sensor is to be installed.
The surface should not have any buildup or scale but does
be perfectly clean.
• The sensor stud located at the bottom of the sensor
housing must make solid contact with the surface of the
pipe to be monitored.
MOUNTING TO A FLA T SURFACE:
Refer to the mounting holes located at each end of sensor
housing (Fig. 6).
• Mark mounting holes.
• Drill pilot holes for mounting screws.
• Screw sensor housing to flat surface.
BFM
SENSOR
SIDE VIEW FRONT VIEW
NOTE: STRAPS
OR CLAMPS
ARE USED FOR
MOUNTING TO
NON-FLAT
SURFACE
Figure 7
BFM
SENSOR
SENSOR LOCA TION:
BE SURE SENSOR STUD
IS MAKING A GOOD
TIGHT CONTACT WITH
MOUNTING SURFACE.
STUD SENSOR
INPUT
PUMP
TO ENHANCE SENSITIVY INSTALL THE SENSOR
WHERE THE FLOW IS MOST TURBULENT OR WHERE
MA TERIAL IMPACTS THE PIPE WALL.
THE FOLLOWING POINTS ARE IDEAL (FIG 8):
• Pipe elbow
• Point where material drops into spouting or chutes
• Point where material drops from conveyor onto the chute
TTL LOGIC OUTPUT :
The TTL Logic output is a 5VDC output.
To obtain a TTL Logic Output install jumper J3 as indicated
on the BFM PCB. Connect logic level output wiring to the
“Out” (+5V) terminal and the Sensor “-” (0V) terminals on TB1.
• NO FLOW: Red LED lights and 0VDC will be present at the
“OUT” terminal.
• FLOW: Green LED will light and 5VDC will be present at the
“OUT” terminal.
RS232 LOGIC OUTPUT :
The RS232 output is an industry standard 5VDC minimum
into 3K load. T o obtain an RS232 logical output do not install
jumper J3 as indicated on BFM PCB.
• NO FLOW: Red LED lights and 0 VDC will be present at the
"OUT" terminal.
• FLOW: Green LED will light and 5VDC min. will be present
at the "OUT" terminal.
Figure 8
LOW LEVEL (LOGIC) OUTPUT WIRING
Low level outputs available (Fig. 9):
• TTL logic output
• RS232 logic output
NOTE: For proper logic input to your computer, consult your
computer manual for the correct pin configuration for RS232
or TTL.
RELA Y OUTPUT WIRING
Relay (CTR1) Contact Specifications:
• 4 amp at 125 or 250 VAC
• 1/10 HP at 125 or 250 VAC
• 3 amp at 30 VDC
Relay Output Wiring on TB2 (Fig. 10):
• COM = Common contact
• N/C = Normally closed
• N/O = Normally open
Figure 9
Figure 10
SOUNDING AN ALARM TO INDICATE DECREASED
STOP
START
STARTER
COIL
NORMAL STARTER CIRCUIT
STOP
START
STARTER
COIL
TB2
COM
N / 0
M / C
STARTER CIRCUIT WITH BFM SHUTDOWN
FLOW:
Before the “controlled” equipment can be started again, the
following must occur:
An alarm will sound when flow drops below the preset amount
(Fig. 11):
• When flow drops the relay contacts close to energize the
alarm.
• The power to the alarm (connected to the COM terminal) is
from the motor starter circuit so the alarm can only sound
when the motor is running. When the motor Stop button is
pressed the alarm will silence.
START
MACHING
SUPPLYING
MATERIAL
NOTE: AUXILLARY SET OF
NORMALLY CLUSED
CONCACTS (CLOSED WHEN
STARTER IS ENERGIZED).
MOTOR
STARTER
SWITCH
117VAC
ALARM
TB2
COM
N/0
N/C
AC COM
Figure 11
SHUTTING DOWN EQUIPMENT WHEN FLOW
DECREASES:
• Material is flowing past the BFS-1 sensor .
• The Green L.E.D. (FLOW) indicator light is lit indicating
material flow.
• Y ou may have to hold down the Start button until flow
reaches the preset rate.
As long as material continues to flow past the BFS-1 sensor
above the preset rate, the machine equipment supplying material will continue to run. If the rate of material flow falls below
the preset level, the relay will open and the machine equipment supplying the material will stop.
Figure 13
Equipment shut down mode is required if the flow rate drops
below the preset level. The relay is often wired to stop the
equipment that is supplying the material (Fig. 12 and 13).
Figure 12
SENSITIVITY RANGE ADJUSTMENT AND CALIBRATION
The BFM has (3) three sensitivity range inputs. Select the range
to get the desired sensitivity for the application.
WARNING: TO AVOID ELECTRICAL SHOCK
DISCONNECT AC SUPPL Y VOLTAGE BEFORE
ADDING OR REMOVING JUMPERS ON TB1.
• Minimum (low) range: Install jumper J2 (only)
• Medium range: No jumpers installed (as shipped from
factory)
• Maximum (high) range: Install jumper J1 (only)
ADJUSTING THE SENSITIVITY RANGE:
NOTE: The sensitivity range is factory preset to the Medium
range (no jumpers installed). Verify that the supply voltage and
the flow sensor are wired and installed correctly prior to testing (Fig. 14). After selecting proper sensitivity range, proceed
to the next calibration section.
1. With no material flowing, turn the Sensitivity adjustment to
full clockwise position:
• RED LED will turn on.
2. Start the material flowing at the full rate you wish to moni-
tor:
• If the GREEN LED turns on, then turn the Sensitivity adjust-
ment fully counterclockwise. If that causes the RED LED to
turn on then the correct sensitivity range is selected. If that
does not cause the RED LED to turn on (Green stays lit) then
install jumper J2 (Minimum range) and repeat the test beginning with step #1.
• If the GREEN LED does not turn on when material is flow-
ing, then install jumper J2 (Maximum range) and repeat the
test beginning with step #1.
Figure 14
BFM CALIBRA TION:
Perform sensitivity range jumper selection before performing
calibration.
1. Stop all material from flowing.
2. T urn the Sensitivity adjustment fully clockwise.
3. Start material flowing at the minimum full flow rate desired
• GREEN L.E.D. will light to indicate FLOW .
4. T urn the Sensitivity adjustment counter clockwise until the
RED LED lights to indicate NO FLOW .
5. Turn the Sensitivity adjustment clockwise very slowly until
GREEN LED lights to indicate FLOW .
6. Calibration is now complete.
FINAL SYSTEM CHECK:
• Stop or reduce flow of material and the GREEN LED (FLOW)
will go out and the RED LED (NO FLOW) will light.
MAINTENANCE
Upon final installation of the Series BFM Bulk Flow Monitor,
no routine maintenance is required. A periodic check of
system calibration is recommended. The Series BFM is not
field serviceable and should be returned if repair is needed
(field repair should not be attempted and may void
warranty). Be sure to include a brief description of the
problem plus any relevant application notes. Contact
customer service to receive a return goods authorization
number before shipping.
©Copyright 2008 Dwyer Instruments, Inc. Printed in U.S.A. 12/08 FR#R2-443673-00
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com
Phone: 219/879-8000 www.dwyer-inst.com
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