Seametrics MJN Operating Manual
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MJP/MJN-Series
Pulse Meter Instructions
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MJP/MJN-SERIES INSTRUCTIONS
General Information
General Information ...................................................................................................................................................Page 3
Features ...........................................................................................................................................................................Page 3
Specications ................................................................................................................................................................Page 4
Dimensions ....................................................................................................................................................................Page 5
Pulse Rates .....................................................................................................................................................................Page 5
Shipping Weight ..........................................................................................................................................................Page 5
Pressure Drop Curve ...................................................................................................................................................Page 5
Installation and Operation
Position ............................................................................................................................................................................Page 6
Couplings ........................................................................................................................................................................Page 6
Connections ...................................................................................................................................................................Page 6
Pulse Output ..................................................................................................................................................................Page 6
Setting Pulse Rate .......................................................................................................................................................Page 6
Reading Meter ..............................................................................................................................................................Page 7
Maintenance
Inlet Strainer ..................................................................................................................................................................Page 7
Calibration ......................................................................................................................................................................Page 7
Parts ..................................................................................................................................................................................Back
Seametrics • 253.872.0284 Page 2 seametrics.com
GENERAL INFORMATION
MJP/MJN-SERIES INSTRUCTIONS
MJP-Series and MJN-Series meters use the multi-jet
principle, which has been an internationally-accepted
standard for many years. This type of meter is known for its
wide range, simplicity, and accuracy in low-quality water.
The Seametrics MJP-Series and MJN-Series are certied to
NSF/ANSI 61. The impeller is centered in a ring of jets, with
inlet jets on one level and outlet jets on another. A gear train
drives the register totalizer dials. For pulse output, one of
the pointers is replaced by a magnet, which is detected by
an encapsulated sensor attached to the outside of the lens.
Pulse rate is determined by the dial on which the magnet
is placed, and by the number of sensors (single or double).
Changing the pulse rate requires no special tools and can
be done in the eld.
Features
The MJP-Series has a plastic body and is available in 3/4”,
1”, and 1 1/2” versions.
The MJN-Series has a brass body and is available in 3/4”,
1”, 1 1/2” and 2” versions.
MJPE & MJNE meters use a solid-state, long-lasting Halleffect sensor, which requires power. It is suited for use with
Seametrics controls and metering pumps that have sensor
power.
MJPR & MJNR meters use a two-wire reed switch. They
provide a dry contact closure and do not require power.
MJPT& MJNT meters totalize only and do not have a
sensor.
The MJPE/MJNE or MJPR/
MJNR sensor fastens to
lens without removing top
Plastic body (MJP) or
Brass body (MJN)
Union end couplings
for easy service
Calibration plug seal wire
for tamper evidence
MJP-Series
(plastic body)
MJN-Series
(brass body)
Seametrics • 253.872.0284 Page 3 seametrics.com
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