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MJP/MJN-SERIES
d
C
PULSE METER
APPLICATIONS
Potable water
Cooling tower chemical
control
Industrial water treatment
Deduct metering
Pump Pacing
MJN-SeriesMJP-Series
Features
• Certied to NSF/ANSI 61
• Dry top multi-jet design
• Tolerates low quality water
• Simple pulse output
Contact your Supplier
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 lowquality 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.
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 Hall-effect 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.
253.872.0284 seametrics.com
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MJP/MJN-SERIES
PULSE METER
Features
The MJPE/MJNE or MJPR/
MJNR sensor fastens to
lens without removing top
MJN-Series
(brass body)
Calibration plug seal wire
for tamper evidence
Plastic body (MJP) or
Brass body (MJN)
Specications*
Power 6 mA at 12 Vdc (MJPE & MJNE only)
Temperature 105˚ F (40˚ C) max
Pressure 150 psi operating (10.3 Bar)
Materials Body Plastic (MJP) or Eco-brass alloy (MJN)
Accuracy ±1.5% of reading
Pulse Output MJPE/MJNE MJPR/MJNR MJPT/MJNT
Cable Length 12’ (4 m) standard (2000’ maximum run)
Flow Rates (GPM)** 3/4” 1” 1 1/2” 2” (MJN only)
Regulatory NSF/ANSI 61, complies with Federal Public Law 111-380
Standards ISO4064 Class B, AWWA C708
*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.
Union end couplings
for easy service
MJP-Series
(plastic body)
Internals Engineered thermoplastic
Magnet Alnico
Fittings Lead-free tail piece
Sensor Hall-effect device Reed switch Totalizer only
Max Current 20 mA 20 mA n/a
Max Voltage 24 Vdc 24 Vdc or Vac n/a
Minimum 0.25 0.75 1.5 2.0
Maximum 20 50 100 160
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MJP/MJN-SERIES
20
15
10
5
0
2.557.510152025
5101520253035404550
10 20 30 40 50 60 70 80 90 100
3/4"
1"
1
-1/2"
13 26 39 52 65 78 91 104 117 1302"
12.5
17.5 22.5
(MJN only)
PULSE METER
Dimensions
C
A
B
MJP 3/4” 1” 1 1/2”
A (body)
B (w/couplings)
C (IPS thread)
D (NPT thread)
MJN 3/4” 1” 1 1/2” 2”
A (body)
B (w/couplings)
C (IPS thread)
D (NPT thread)
7 1/2” 10 1/4” 11 3/4”
11 5/8” 15” 17”
1” 1 1/4” 2”
3/4” 1” 1 1/2”
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”
Pressure Drop Curve
Pulse Rates
3/4” 1” 1 1/2” 2”
D
Pulses per
Gallon
Gallons per
Pulse
Cubic Feet
per Pulse
Pulses
per Cubic
Meter
Liters per
Pulse
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
50*
100
100
100
*MJPR/MJNR dual reed switch meters only
†MJPR/MJNR single reed switch meters only
4†
2*
5*
10
5*
10
10
10
(MJN only)
4†
2*
1
1
1
1
5*
10
50*
100
1
1
5*
10
1
1
10
100
1
1
10
100
Shipping Weight
MJP MJN
lb kg lb kg
3/4”
1”
1 1/2”
2”
3 1.4 6 2.7
4.5 2 8 3.6
7.5 3.4 13 5.9
n/a n/a 16 7.3
Pressure drop in P.S.I.
Rate of ow in gallons per minute (GPM)
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MJP/MJN-SERIES
PULSE METER
How to Order
Model Size Pulse Rate Options
PLASTIC
MJPR = Reed Switch
MJPE = Hall-effect sensor
MJPT = Totalizer only
BRASS
MJNR = Reed Switch
MJNE = Hall-effect sensor
MJNT = Totalizer only
-075 = 3/4”
-100 = 1”
-150 = 1 1/2”
-200 = 2”
(MJN only)
MJPR/
MJNR
(Single Reed)
20P = 20 Pulse/Gal √*
10P = 10 Pulse/Gal √* √*
4P = 4 Pulse/Gal √
2P = 2 Pulse/Gal √
1G = 1 Gal/Pulse √ √
5G = 5 Gal/Pulse √
10G = 10 Gal/Pulse √ √
50G = 50 Gal/Pulse √
100G = 100 Gal/Pulse √ √
1CF = 1 CF/Pulse √ √
5CF = 5 CF/Pulse √
MJPR/
MJNR
(Dual Reed)
MJPE/
MJNE
MJPT/
MJNT
-06 = LMI pump connector
-07 = Seametrics control connector
Accessories
PD10 = Pulse divider
PS40 = Pulse splitter
PT35 = Pulse timer
10CF = 10 CF/Pulse √ √
1CM = 1 Pulse/CM √ √
10CM = 10 Pulse/CM √ √
100CM = 100 Pulse/CM √ √
1L = 1 Liter/Pulse √ √
10L = 10 Liter/Pulse √ √
100L = 100 Liter/Pulse √ √
G = Gallons √
CF = Cubic Feet √
CM = Cubic Meters √
L = Liters √
*3/4” only
103239-075 = 3/4” Brass coupling assembly w/gasket (incl 2 sets)
103239-100 = 1” Brass coupling assembly w/gasket (incl 2 sets)
103239-150 = 1.5” Brass coupling assembly w/gasket (incl 2 sets)
103239-200 = 2” Brass coupling assembly w/gasket (incl 2 sets)
103924-075 = 3/4” Plastic coupling assembly w/gasket (incl 2 sets)
103924-100 = 1” Plastic coupling assembly w/gasket (incl 2 sets)
103924-150 = 1.5” Plastic coupling assembly w/gasket (incl 2 sets)
Seametrics • 19026 72nd Avenue South • Kent, Washington 98032 • USA
(P) 253.872.0284 • (F) 253.872.0285 • 1.800.975.8153 • seametrics.com
LT-14382r2.0 20161012
10/12/16
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