Discontinued – Max Machinery 276-5XX SERIES 4-20MA TRANSMITTERS User Manual

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USERS OPTIONS & ADJUSTMENTS

—Ripple Adjustment

Ripple Adjustment: (276-515 and 276-525 Transmitters Only)

This adjustment will have to be made if the Transmitter is unscrewed from the Flowmeter.

The 276-515 and the 276-525 Transmitters are made to compensate for the non uniform rotational
rate of the 210 series piston meters, which can cause as much as 50% ripple at the Transmitter
output. To take advantage of this feature, the stator of the 276 Transmitter must be positioned
correctly for each meter it is mated to.

The Flowmeter must have a flow through
it for this adjustment to be made. It is
advisable to adjust the ripple at the lower
end of the flow range; although if the
flow rate is less than 5% of the
Flowmeter’s full scale capability, you
may have problems with this procedure.
Increase the Sensitivity Adjustment (R33)
clockwise just until the Ripple LED (L2)
next to it starts to turn on. Then turn the
Stator Adjustment Screw in a direction that decreases the brightness or turns off the Ripple LED.
Once again increase the Sensitivity Potentiometer until the LED just comes on and again turn the
stator adjustment in a direction that minimizes the LED brightness. Repeat this process until any
further change in the position of the stator screw causes the LED brightness to increase rather
than decrease.

Shown below is the effect of the stator position on output ripple. There are four best and four
worst positions for the stator per revolution. This means that it will take a maximum of 45° on the
Stator Adjustment Screw to find the best location.

— ATTENTION —

The Transmitter pickup coil is phased to

the Flowmeter. If the two are unscrewed

for any reason, realignment will be

necessary. See Transmitter Manual.

LOOSEN TO ROTATE TRANSMITTER

(1 TURN MAXIMUM)

DO NOT UNSCREW HERE

OUTPUT RIPPLE VS STATOR POSITION

WORST STATOR

POSITION

BEST STATOR

POSITION

50% Ripple

10% Ripple

Discontinued