Banjo MFM100 User manual

The 1" Flow Meter Series are a full-bore, plastic-bodied electromagnetic
ow meter designed for ow and usage monitoring applications in 1" pipe.
The polypropylene ow tube oers corrosion resistance to a wide range of
chemicals. Its light weight and clamp anges allow it to be easily installed
or removed from the pipe for inspection. There are multiple congurations.
With no moving parts, the magmeter permits unobstructed ow,
minimizing ow disturbances. The 1" Meter Series can be used in
piping congurations where there is little space between the meter
and valve. The 1" Meter Series, like other magmeters, are resistant to
wear from debris. Since there are no bearings or propeller to wear out,
downtime and maintenance are kept to a minimum. Because there are no
mechanical parts in the ow stream, the meter tolerates high ows without
damage. Please note that ow does not automatically turn the meter on.
The hinged, polyethylene cover protects from dust and UV rays, while
permitting easy access to the LCD ow rate and total display. The
electronics housing is made of rugged powder-coated die-cast aluminum.
Flow rate and total can be displayed in a variety of units, customer-
selected and factory-set.
The 1" Meter Series are used for tracking ow rates and total ow in
usage monitoring applications. These would include wells, industrial
wastewater, leach mining discharge, cooling tower deduct metering, turf
and landscape applications, and other water reclamation operations. In
the event of DC power loss, or when changing batteries, the ow meter
will retain internal settings and ow total.
The ow meters are externally powered via a 5-pin connector cable
(20ft/6m) which also provides pulse output for use with a variety of
displays and controls for remote reading, data logging, pulse-to-analog
conversion, and telemetry applications.
The ow meters are battery-operated units for use when pulse output
is not required. The batteries are user replaceable with an approximate
1-year life under continuous use, or more depending on the duty cycle.
The ow meters shut o after minutes of inactivity to preserve battery life.
MFM100 & FM100
MFM100DC & FM100DC
Plastic-Bodied Magmeter
APPLICATIONS
Usage monitoring, such as:
• Industrial wastewater discharge monitoring
• Cooling tower deduct metering
• Heap leach mining discharge monitoring
• Well monitoring
• Turf and landscape water monitoring
• Agriculture liquid monitoring
FEATURES
• Simple as a mechanical meter
• No moving parts
• Minimal straight pipe required
• Battery powered
• Built-in rate & total indicator
• Corrosion resistant
Unobstructed Flow
150 Banjo Drive Crawfordsville, IN 47933
ph: 765-362-7367 fax: [phone]
www.banjocorp.com Manual# FMM1000
* Will not read petroleum
based liquids.

2
1. When placing the owmeter in line, it is important to rotate the
owmeter so that it is approximately at a 45-degree angle. (See
gure 1) This will improve performance of the ow meter. The ow
meter can be placed vertical as long as ow is sucient to ll the
pipe.
2. There are 3 photoeyes located on the face of the ow meter.
Note: These are not buttons so you will not push them, instead, to
activate you must hold your nger over the photoeye for 2-4
seconds. To reset the running total you must hold your nger over
both the “batch reset” and the “batch/total” photoeyes. If you would
like liters rather than gallons, you will need to hold your nger over the
rst and third photoeyes at the same time. (See gure 2)
3. There are six (6) AA batteries located inside the ow meter.
To replace the batteries, simply remove the four cover bolts and
gently remove the top cover. Replace batteries and fasten cover
back in place. Be careful not to pinch any wires when assembling the
cover. It is a good idea to change the batteries yearly.
4. The ow rate of the meter is designed to have an unlimited ow,
meaning that the meter will read as much ow as one can push
though a 1" full port coupling. However, the accuracy of the meter
decreases as the meter reaches ows under 2.3 GPM. From 2.3 to
110 GPM the meter is within 2-3% accuracy.
5. It is good to thoroughly clean the meter and the electrodes at least
once a year. This can be done by gently rubbing the electrodes with a
piece of emery cloth.
FIGURE 1 FIGURE 2
photoeye
6. The “EP” is an error message meaning that the system is idle and
there is no uid traveling through it at that time.
7. It is recommended to have at least 10 inches of straight pipe before
the ow meter and at least 10 inches after.
8. The cover can be rotated. To rotate cover 90°, remove the 4 cover
bolts and carefully rotate the cover to the desired position. Take note
not to pull or pinch any of the connecting wires. To rotate the cover
180°, remove the 4 cover bolts, the 6 AA batteries and the 2 screws
that hold the battery holder in place. Then rotate the battery holder
and the cover together to the desired location. Take note not to pull
or pinch any of the connecting wires.
INSTRUCTIONS

3
Polyethylene protective cover
LCD rate and total indicator
Powder-coated die cast-aluminum
electronics housing
Corrosion-resistant glass-lled
polypropylene body
Lightweight for easy handling
Clamping anges for ease
of installation
316 SS electrodes
FEATURES
FM100 & FM100DC
DIMENSIONS
MFM100 & MFM100DC
U
U
55
/16
45/32
51/2
1
1"
NPT
U
U
55/16
45/32
53/8
1
45/32"
55/16"
5½"
1" NPT
45/32"
55/16"
53/8"
1"
1"

4
SPECIFICATIONS
Pipe Size 1" Full Port
Fittings Flange Clamps/NPT Pipe Fittings
Pressure 150 PSI or 10.3 bar working pressure @ 70°F
Operating Temperature Range 10° to 130°F (-12° to 54°C)
Accuracy +/-1% of reading from 100% to 10% of full scale
+/-3% of reading from 10% to 10% of full scale to cut o=> 2% to 10%
Flow Range Minimum 2.3 GPM & 8.7 LPM
Maximum 110 GPM & 416.4 LPM
Materials Body Glass-lled polypropylene
Electrodes 316 stainless steel
Electronics Housing Die cast aluminum, powder-coated
Display Cover Polyethylene
Display Rate
Digits 6
Units Gallons/Minute
Liters/Minute
Power 6 AA alkaline cells, replaceable Life: 1 year with meter in use; 3 years dry
10-30 Vdc @ 60 mA max (15 mA average) Note: Using an unregulated power
supply >18 Vdc may damage the meter due to AC line input voltage uctuation.
Pulse Output Signal Current sinking pulse, opto isolate, 32 Vdc max at 10 mA max
Standard Pulse Rate 1 unit/pulse out, pulse width of 10 ms depending on unit selection
High Frequency 80 Pulse per unit, pulse width 1.1 ms, min-max frequency, 3-150 HZ
Empty Pipe Detection Hardware/software, conductivity-based
Conductivity >20 microSiemens
Environmental NEMA 4X standard; -40° to 176°F (-40° to 80° C) storage
Electrical Connection 5 pin male circular connector, mates to industry standard cable (20ft/6m)
* Specications subject to change • Please consult our website for current data (www.banjocorp.com)
SPECIFICATIONS*

Piping Conditions
Installing the meter with a length of straight pipe at least two
times the diameter upstream and one diameters downstream is
highly recommended. Some piping conditions require more than
this. See chart for recommendations.
If hose is used, use smooth bore hose.
Follow the diagram below to make the connections.
INSTALLATION
Step 1.
Position gasket
at either end Step 2.
Place adapter against
gasket, open screw
clamps to clear anges
Step 3.
Place screw clamps over
both adapter and meter
anges and tighten screws
5

This is an all position meter which can be installed either vertically
or horizontally, register up, down or angled. However, entrained air
or solids may make some positions preferable to others. See the
position diagram for guidance.
POSITION
Recommended:
May prevent sediment
or bubble problems
Electrode
moved from
top by rotating
meter
Intermittent air bubbles
miss electrode
Electrodes free
from sediment
build-up
Intermittent air
bubbles pass
over electrode
Possible
sediment
build-up
Less Ideal:
Air bubbles and sediment
on the electrodes can
aect accuracy
6

STRAIGHT AND FULL PIPE RECOMMENDATIONS
7
10x
It is recommended to have at least 10 inches of straight pipe before the ow meter and at least 10 inches after.
X = Diameter
ELECTRICAL CONNECTIONS, CABLE CONNECTIONS & OPERATION
10x
ELECTRICAL CONNECTIONS
A connector is provided on the outside of the ow meters. To connect to the meter, plug the cable in and hand tighten the retaining threads. Follow
the diagram to make connections. If you are using the pulse output, connect power rst and determine that the meter is working properly by
observing the display, then connect the pulse output.
CABLE CONNECTIONS
OPERATION - GROUNDING
For best performance, especially in noisy environments, the gray ground wire and the bare drain wire should be connected together and to a good
earth ground as close to the meter as possible. Metal pipe and ttings in contact with the uid, should also be bonded to the same earth ground with
corrosion-resistant connections.

MAINTENANCE, REPAIR AND TROUBLE SHOOTING
MAINTENANCE AND REPAIR
There are no user-serviceable parts in the 1" Meter Series meters except the batteries.
Battery Replacement
When the “Lo Batt” indicator appears, the batteries should be changed. Six alkaline AA cells are required. To change the batteries, rst remove the
four screws which hold the top cover in place. Be careful not to lose the washers. Move the top cover to one side and remove the foam retainer
which covers the battery tray. Remove the old batteries and replace them with fresh ones, taking care to follow the polarity indicators in the battery
tray. Replace the foam retainer, then put the top cover back in place. Put the four screws with washers back and tighten them rmly.
TROUBLE SHOOTING
PROBLEM PROBABLE CAUSE TRY
Blank Display Batteries dead or incorrectly installed Check polarity, replace batteries
Reading “-EP-” Empty or partly lled pipe
Excessive air pockets or foaming Rearrange piping to ensure full pipe
Flow but no ow rate reading Heavily coated electrodes Remove meter and wipe electrodes
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Display
The display reads ow rate and accumulated total, in the units for which it was ordered. The top line is total, the bottom line is rate, and indicators
give the units (ac-ft, GPM for instance.) Empty or partially-full pipe is automatically detected and is indicated by a reading of “-EP-”.
Battery
Estimated battery life is approximately one year. Results may vary depending on the application. On the battery-powered 1" Meter Series there are
low-battery indicators (“lo bat”) when the battery voltage drops below a certain point. Batteries should be changed within four weeks of the
appearance of this indicator.
150 Banjo Drive Crawfordsville, IN 47933
ph: 765-362-7367 fax: [phone]
www.banjocorp.com
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