Seametrics MJ Operating Manual
ISO
MJ/MJH-SeriesMJ/MJH-Series
Pulse Meter InstructionsPulse Meter Instructions
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TABLE OF CONTENTS
General Information
General Information ...................................................................................................................................................Page 3
Specications ................................................................................................................................................................Page 3
Pulse Rates .....................................................................................................................................................................Page 4
Installation and Operation
Position ............................................................................................................................................................................Page 4
Couplings ........................................................................................................................................................................Page 4
Connections ...................................................................................................................................................................Page 4
Pulse Output ..................................................................................................................................................................Page 5
Moving the Magnetic Pointer .................................................................................................................................Page 5
Setting Pulse Rate .......................................................................................................................................................Page 5
Sample Set Up ..............................................................................................................................................................Page 6
Special Congurations ...............................................................................................................................................Page 6
Reading Meter ..............................................................................................................................................................Page 6
Maintenance
Inlet Strainer ..................................................................................................................................................................Page 6
Calibration ......................................................................................................................................................................Page 6
Internal Parts Replacement ......................................................................................................................................Back
MJ/MJH-SERIES INSTRUCTIONS
Seametrics • 253.872.0284 Page 2 seametrics.com
GENERAL INFORMATION
MJ/MJH-SERIES INSTRUCTIONS
MJ/MJH-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
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.
Specications*
Power 6 mA at 12 Vdc
Temperature Cold Water 105˚ F (40˚ C) max
Hot Water 194˚ F (90˚ C) max
MJE (cold water) and MJHE (hot water) meters use a solid-
state, long-lasting Hall-eect sensor, which requires power.
They are suited for use with Seametrics controls and
metering pumps (LMI for instance) that have sensor power.
MJR (cold water) and MJHR (hot water) meters use a reed
switch. They provide a dry contact closure and do not
require power.
MJT (cold water) and MJHT (hot water) meters do not have
a sensor, and they totalize only.
Pressure 150 psi operating (10.3 Bar)
Materials Body Cast broze, epoxy powder coated inside and out
Internals Engineered thermoplastic
Magnet Alnico
Accuracy ±1.5% of reading
Pulse Output MJE/MJHE MJR/MJHR MJT/MJHT
Sensor Hall-eect device Reed switch Totalizer only
Max Current 20 mA 20 mA n/a
Max Voltage 24 Vdc 24 Vdc or Vac n/a
Cable Length 12’ (4 m) standard (2000’ maximum run)
Flow Rates (GPM)** 3/4” 1” 1 1/2” 2”
Minimum 0.22 0.44 0.88 1.98
Maximum 22 52 88 132
*Specications subject to change • Please consult our website for current data (www.seametrics.com).
** Caution: Excessive ow can cause breakage. Do not exceed recommended maximums.
Seametrics • 253.872.0284 Page 3 seametrics.com
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