Pulse Output; Moving The Magnetic Pointer; Setting Pulse Rate - Seametrics MJ Series Instructions Manual

INSTALLATION AND OPERATION
CHANGING PULSE RATES

Pulse Output

Both MJE/MJHE and MJR/MJHR sensors respond to
a magnet that rotates on the face of the meter under
the lens. The sensor turns on and off once each time
the magnet passes under it. Sensors are designed for
electronic control loads, and should not be used to switch
power loads or line voltages. See maximum current and
voltage ratings, under Specifications.

Moving the Magnetic Pointer

NOTE! When removing the large meter nut,
Seametrics recommends using a 24" pipe
wrench. Larger or smaller pipe wrenches
may damage the nut on units!!
Remove meter top and lens, taking care not to lose the
sealing ring. With fingers, lift the magnet pointer off
its shaft and remove the plain pointer from the target
dial. Reverse their positions and press them firmly into
place. Securely seat the sealing ring and replace the lens,
matching the tab on the lens to the notch on the meter
to align the sensor with the magnetic pointer dial. Thread
the meter top on and tighten.
†NOTE: A special magnet (available from the factory) is
required to achieve a rate of 4 pulses per gallon. It should
be placed on the x0.1 dial, with non-magnetic pointers on
the remaining dials. Otherwise, the procedure is the same.
Seametrics • 253.872.0284
Setting Pulse Rates
The pulse rate is determined by which sensor was ordered
from the factory (single reed switch, dual reed switch, or
single Hall-effect) and by the dial on which the magnet
pointer is located. The pointer is set at the factory, but can
be changed in the field as follows.
1. Find your desired pulse rate (Column 1)
2. Note the magnet pointer position (Column 2)
3. Move the magnet pointer to the appropriate dial
position (see detailed instructions on next page)
4. Use the appropriate Connection Diagram (from
Column 3) to wire the sensor to your remote device
(using diagrams at right).
Col. 1
Meter Size Pulse Rate
*20 P/G
10 P/G
†4 P/G
*2 P/G
3/4"
1 P/G
*5 G/P
10 G/P
*50 G/P
100 G/P
†4 P/G
*2 P/G
1P/G
1"
*5 G/P
10 G/P
*50G.P
100 G/P
†4 P/G
*2 P/G
1 P/G
1-1/2"
*5 G/P
10 G/P
*50 G/P
100 G/P
†4 P/G
*2 P/G
1 P/G
2"
*5 G/P
10 G/P
*50 G/P
100 G/P
*These pulse rates available in MJR and MJHR dual reed switch meters only.
†This pulse rate available in MJR and MJHR single reed switch meters only.
Page 5
MJ/MJH-SERIES INSTRUCTIONS
Col. 2
Magnet Pointer Dial
Position
x0.01
x0.01
x0.1
x0.1
x0.1
x1
x1
x10
x10
x0.1
x0.1
x0.1
x1
x1
x10
x10
x0.1
x0.1
x0.1
x1
x1
x10
x10
x0.1
x0.1
x0.1
x1
x1
x10
x10
seametrics.com
Col. 3
Connection
Diagram #
2
1
1
2
1
2
1
2
1
1
2
1
2
1
2
1
1
2
1
2
1
2
1
1
2
1
2
1
2
1