General Information; Specifications - Seametrics MJ Series Instructions Manual

GENERAL INFORMATION

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 field.

Specifications*

Power
Temperature Cold Water
Hot Water
Pressure
Materials Body
Internals
Magnet
Accuracy
Pulse Output
Sensor
Max Current
Max Voltage
Cable Length
Flow Rates (GPM)**
Minimum
Maximum
*Specifications subject to change • Please consult our website for current data (www.seametrics.com).
** Caution: Excessive flow can cause breakage. Do not exceed recommended maximums.
Seametrics • 253.872.0284
6 mA at 12 Vdc
105˚ F (40˚ C) max
194˚ F (90˚ C) max
150 psi operating (10.3 Bar)
Cast broze, epoxy powder coated inside and out
Engineered thermoplastic
Alnico
±1.5% of reading
MJE/MJHE
Hall-effect device
20 mA
24 Vdc
12' (4 m) standard (2000' maximum run)
3/4"
0.22
22
Page 3
MJ/MJH-SERIES INSTRUCTIONS
MJE (cold water) and MJHE (hot water) meters use a solid-
state, long-lasting Hall-effect 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.
MJR/MJHR
Reed switch
20 mA
24 Vdc or Vac
1" 1 1/2"
0.44 0.88
52 88
MJT/MJHT
Totalizer only
n/a
n/a
2"
1.98
132
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