Seametrics MJN Specifications

MJP/MJN-SERIES

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PULSE METER

APPLICATIONS

Potable water

Cooling tower chemical
control

Industrial water treatment

Deduct metering

Pump Pacing

MJN-SeriesMJP-Series

Features

• Certied 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 certied
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)

Specications*

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

*Specications 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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