MJ/MJH-SERIES
ISO
ISO
MJ/MJH-SERIES
PULSE METER
PULSE METER
APPLICATIONS
Cooling tower chemical
control
Industrial water treatment
Deduct metering
Pump Pacing
Features
• Dry top multi-jet design
• Tolerates low quality water
• Simple pulse output
• Cold or hot water models
Contact your Supplier
MJ-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. Seametrics
oers cold or hot water models. 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.
Mechanically, all MJ-Series meters are the same. The dierence among *MJE/
MJHE, *MJR/MJHR and *MJT/MJHT meters is in the sensor. MJE/MJHE meters
use a solid-state, long-lasting Hall-eect sensor, which requires power. It is
suited for use with Seametrics controls and metering pumps (LMI for instance)
that have sensor power. MJR/MJHR meters use a two-wire reed switch. They
provide a dry contact closure and do not require power. MJT/MJHT meters
totalize only and do not have a sensor.
*Note on Nomenclature: Meter names that include “H” are hot water models. Without
the “H” = cold water models.
C
C
o
o
d
d
m
m
e
e
i
i
p
p
f
f
i
i
a
a
t
t
n
n
r
r
e
e
y
y
C
C
ISO
ISO
9001
9001
253.872.0284 seametrics.com
253.872.0284 seametrics.com
MJ/MJH-SERIES
MJ/MJH-SERIES
MJ/MJH-SERIES
MJ/MJH-SERIES
PULSE METER
PULSE METER
PULSE METER
PULSE METER
FEATURES
Available in cold or hot water models
Either MJE/MJHE or MJR/MJHR sensor
fastens to lens without removing top
Calibration plug seal wire for tamper evidence
Cast bronze body
Union end couplings for easy service
SPECIFICATIONS*
Power
Temperature
Model
Pressure
Materials
Accuracy
Pulse Output
Cable Length
Flow Rates (GPM)
6 mA at 12 Vdc (MJE/MJHE only)
Cold water 105˚ F (40˚ C) max
Hot Water 194˚ F (90˚ C) max
150 psi operating
Body Cast bronze, epoxy powder coated inside and out
Internals Engineered thermoplastic
Magnet Alnico
+/- 1.5% of reading
MJE/MJHE MJR/MJHR MJT/MJHT
Sensor Hall-eect device Reed switch Totalizer only
Max Current 20 mA+ 20mA n/a
Max Voltage 24 Vdc 24 Vdc or Vac n/a
12’ (4 m) standard (2000’ maximum run)
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).
253.872.0284 Page 2 seametrics.com
MJ/MJH-SERIES
20
15
10
5
0
2.5 5 7.5 10
12.5
15
17.5
20
22.5
25
5101520253035404550
10 20 30 40 50 60 70 80 90 100
3/4"
13 26 39 52 65 78 91 104117 130
1"
1
-1/2"
2"
MJ/MJH-SERIES
PULSE METER
PULSE METER
DIMENSIONS
C
A (body)
B (w/couplings)
C (IPS thread)
D (NPT thread)
D
A
B
3/4” 1” 1-1/2” 2”
7-1/2” 10-1/4” 11-3/4” 11-3/4”
11-5/8” 15” 17” 17-5/8”
1” 1-1/4” 2” 2-1/2”
3/4” 1” 1-1/2” 2”
PULSE RATES
3/4” 1” 1 1/2” 2”
Pulses per
Gallon
Gallons per
Pulse
Cubic Feet
per Pulse
Pulses
per Cubic
Meter
Liters per
Pulse
*MJR/MJHR dual reed switch meters only
†MJR/MJHR single reed switch meters only
20*
10
4†
2*
1
1
5*
10
50*
100
1
5*
10
1
10
100
1
10
100
4†
2*
1
1
5*
10
50*
100
1
5*
10
1
10
100
1
10
100
4†
2*
1
1
5*
10
50*
100
1
5*
10
1
10
100
1
10
100
4†
2*
1
1
5*
10
50*
100
1
5*
10
1
10
100
1
10
100
PRESSURE DROP CURVE
Pressure drop in P.S.I.
FLOW RATES (GPM
3/4” 1” 1-1/2” 2”
Minimum 0.22 0.44 0.88 1.98
Maximum 22 52 88 132
Rate of ow in gallons per minute (GPM)
)
253.872.0284 Page 3 seametrics.com
MJ/MJH-SERIES
MJ/MJH-SERIES
PULSE METER
PULSE METER
HOW TO ORDER
MODEL SIZE PULSE RATE OPTIONS
Cold water, Reed switch = MJR
Cold water, Hall-eect sensor = MJE
Cold water, Totalizer only = MJT
Hot water, Reed switch = MJHR
Hot water, Hall-eect sensor = MJHE
Hot water, Totalizer only = MJHT
3/4” = -075
1” = -100
1-1/2” = -150
2” = -200
†*20 Pulse/Gal = 20P
†10 Pulse/Gal = 10P
*4 Pulse/Gal = 4P
*2 Pulse/Gal = 2P
1 Gal/Pulse = 1G
*5 Gal/Pulse = 5G
10 Gal/Pulse = 10G
*50 Gal/Pulse = 50G
100 Gal/Pulse = 100G
1 CF/Pulse = 1CF
*5 CF/P = 5CF
10 CF/P = 10CF
1 CM/P = 1CM
10 CM/P = 10CM
100 CM/P = 100CM
1L/P = 1L
10 L/P = 10L
100 L/P = 100L
†3/4” Only
*MJR/MJHR Meters Only
LMI 4-pin pump connector = -06
Seametrics 3- pin control connector = -07
LMI 5-pin pump connector = -106
ACCESSORIES
Pulse splitter = PS40
Pulse timer = PT35
CONTACT YOUR SUPPLIER
Seametrics • 19026 72nd Avenue South • Kent, Washington 98032 • USA
(P) 253.872.0284 • (F) 253.872.0285 • 1.800.975.8153 • seametrics.com
LT-65650059r2.5 20200203
2/3/2020
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