Netafim WATER METERS Maintenance Manual
INSTALLATION, OPERATION
AND MAINTENANCE GUIDE
‘M’ SERIES
WATER METERS
WATER METERS
METAL ‘M’ SERIES
WATER METER
PLASTIC ‘M’ SERIES
WATER METER
MAINTENANCE REQUIREMENTS
1. Inlet side basket filter should be removed and cleaned every 90 days or as needed based on
the water quality at the site (see Figure 5).
2. Inlet side basket filter must remain in place during normal operation in order to avoid debris
entering and clogging the metering chamber.
3. Teflon tape should be used on pipe fittings and connections as needed to prevent leaks.
WARNING:
Units must not be subjected to system ‘blow out’ using compressed air. Subjecting the water
meter to this procedure will result in product failure and the resulting damage is not covered under
warranty. It is recommended that the water meter be installed in systems or portions of systems
that will gravity drain for winterization only.
If the unit is installed in a system which will be winterized with compressed air, please do one of
the following:
Install manual ball valves on each side of the water meter to isolate the water meter
from the system blow out procedure. Close the manual ball valve on one side of the
water meter, perform the blow out procedure and then open the manual ball valve.
Repeat process on the other side.
Remove the water meter before the blow out procedure and replace it with a section of
PVC/Polyethylene tubing. When the blow out procedure is complete, reinstall the water
meter.
Cleaning Inlet Side
Basket Filter
‘M’ SERIES WATER METER WARRANTY
Netafim ‘M’ Series Water Meters are individually tested, calibrated and inspected to ensure they
meet the highest quality standards and the testing documents are included with each meter. They
also have the industry’s longest warranty.
WARRANTY
Netafim USA’s ‘M’ Series Water Meters are used as sub-meters for residential or commercial
applications and the industry’s smallest multi-jet water meter. The multi-jet principle assures an
equally distributed load on the impeller minimizing wear and maintaining accuracy. These meters
offer the best cost and performance, long-life flow measurement instruments. Wide clearances in
the measuring chamber and negligible area of contact between static and moving parts are the
main reasons for the high reliability of this design even in hard water.
‘M’ SERIES WATER METERS
INDUSTRY’S SMALLEST WATER METERS
FEATURES:
Only one moving part - the impeller - in
contact with the water for minimum wear
and utmost reliability
Magnetically driven sealed registers with
stainless steel/composite encapsulated
and guaranteed against fogging due to
moisture
Very accurate over a wide range of
flows for flexible and efficient water
management
3/4”
1”
0.2 GPM
0.3 GPM
0.9 GPM
1.2 GPM
11 GPM
15.4 GPM
14 GPM
20 GPM
PERFORMANCE DATA
LOWEST FLOW
WITHIN ± 5%
ACCURACY
LOWEST FLOW
WITHIN ± 2%
ACCURACY
NOMINAL FLOW
WITHIN ± 2%
ACCURACY
MAXIMUM FLOW
WITHIN ± 2%
ACCURACY
SIZE
3/4” PLASTIC
3/4” METAL
1” PLASTIC
1” METAL
11 1/4”
11 1/4”
14 3/4“
14 3/4”
3 3/4“
3 3/4”
4 1/4“
4 1/4”
4 1/4”
4 1/4”
4 1/4“
4 1/4”
1.3 lbs.
5.0 lbs.
2.4 lbs.
7.2 lbs.
DIMENSIONS AND WEIGHT
LENGTHSIZE/BODY WIDTH HEIGHT WEIGHT
INTRODUCTION
3/4” AND 1”
140 PSI
UP TO 122° F
CORROSION-PROOF COPPER ALLOY
COMPOSITE
MALE PIPE THREAD
AVAILABLE SIZES
MAXIMUM WORKING PRESSURE
MAXIMUM LIQUID TEMPERATURE
BODY MATERIAL - METAL
BODY MATERIAL - PLASTIC
CONNECTIONS
SPECIFICATIONS
Inlet Side
Basket Filter
Measuring
Chamber
Impeller
Pulse Reed
Switch
Sealed
Register
TamperProof Tab
2 • ‘M’ SERIES WATER METERS
‘M’ SERIES WATER METERS • 3
REGISTERS
REED SWITCH REGISTER
The Reed Switch Register is a dry contact or simple switch
closure for communicating with control and monitoring
equipment. Registers are interchangeable and easily
replaced with common tools. They are removable even when
the meter is operating. A leak indicator in the center of the
dial registers the lowest flow through the meter. Flows are
totalled in U.S. Gallons and each dial face indicates the
multiplication factor.
Magnetic coupling activates the reed switch
creating a pulsed output.
Dry contact uses very little electric power.
Calculates volume related functions such as
data recorders or simple counters.
Maximum contact current is 50mA and
maximum contact voltage is 48VDC.
Red Wire = Positive
Black Wire = Negative
PHOTO DIODE REGISTER
The Photo Diode Register has a photo coupler
sensor that provides pulse output for communicating
with control and monitoring equipment. Registers are
interchangeable and easily replaced with common tools.
They are removable even when the meter is operating.
Flows are totalled in U.S. Gallons and each dial face
indicates the multiplication factor.
A sensor combines an IR light source and a light
sensitive diode in one package. Signals are created
when the light beam created by the IR light is
interrupted by a rotating element.
Requires a constant supply of DC power.
Minimum contact current is 15mA to a maximum of 25mA
DC through a resistor and maximum voltage is 28VDC.
Yellow Wire = Positive (20-30mA through a resistor)
Transparent Wire = Output (open collector, max. load 2mA)
Bare Wire = Ground
TRANSPARENT : OUTPUT (npn) - MAX 2mA-25V
SHIELD: GROUND MAX. VOLTAGE : 25 VDC
5 YELLOW-MIN 15mA - MAX 25mA DC
Black Wire
Red Wire
TRANSPARENT : OUTPUT (npn) - MAX 2mA-25V
SHIELD: GROUND MAX. VOLTAGE : 25 VDC
5 YELLOW-MIN 15mA - MAX 25mA DC
Yellow
Wire
Transparent
Wire
Bare
Wire
RESISTOR VALUE - Ω
RESISTOR VALUE - W
180
0.25
220
0.25
330
0.25
470
0.5
1,000
1.0
RECOMMENDED RESISTOR VALUES
VOLTAGE › 5
6
9 12 24
Note: Correct polarity
of the leads should be
checked carefully to
prevent damage of the
sensor. Register will not
function properly if the
register lid is not closed
during operation.
Reed
Switch
Only
NOTE: Always refer to the controller
manufacturer’s instructions for proper
installation and connection requirements.
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