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C. Set Up Mode Explanation
To enter Set up mode, press MENU. Notice that a cursor appears on the screen signifying that an
adjustment can be made. To change the figure above the cursor press the UP or DOWN keys until the
desired setting appears, then press ENTER to advance. Continue pressing ENTER to toggle past the
other displays. When all settings are made, press MENU to return to run mode, and save settings.
NOTE: RD pumps may require a password to enter MENU, see page 13.
D. Priming the Pump
Plug in pump, with pump stroking at 125 maximum strokes per minute set stroke knob to 100%. See
stroke length instructions below and menu map on page 11. If fluid begins moving up suction line
while pump is operating, no further priming is required. Otherwise, open bleed valve approximately
one turn until fluid begins to move. When suction line fills, close bleed valve.
Do not over tighten
bleed valve. Damage may occur.
To prime pump, simply press and hold ENTER while the pump is in Run mode. This forces the pump
to stroke at the rate of 125 strokes per minute for three minutes.
E. Adjusting Feed Rate
The R pump allows for exact number of pulses to be set and read on the front panel LCD meter.
It is adjustable from 0 to 125 strokes per minute. In addition, for applications requiring very low
outputs the strokes per minute can be set in strokes per hour from 0 to 125. The 55 GPD models
speed is 0-160.
F. Stroke Length
The stroke length can be adjusted on all MicroTron™ pumps. This adjustment is a mechanical
adjustment made using the large knob on the control panel. To avoid damage to the pump, this
adjustment should only be made while the pump is running at a high stroking rate.
Always start adjusting your pump’s output down by reducing the pump’s speed. By leaving the stroke
length as long as possible you decrease any chance of losing prime.
G. Calculating Output
A pump’s output per minute can be determined by dividing the maximum rated gallons per day by 1440
(minutes per day). For example, a 30 gallons per day (gpd) pump at a maximum stroke length and
speed setting of 125 strokes per minute (spm) will pump 0.000167 gallons per stroke (gps).
30 ÷ 1440 = 0.0208 gpm ÷ 125 spm = 0.000167
With this value and the pump’s speed setting (strokes per minute) you can calculate your pump’s
output at it’s rated pressure. A 30 gpd pump set at 50 strokes per minute:
50spm x .000167gps x 1440 (minutes per day) = 12.02 gallons per day
Reducing the stroke length will reduce the pump’s output again. If the example pump above has it’s
stroke length reduced to 50% the 12.02 gallons per day output is reduced to 6.01. (example: 12.02
gpd x 0.50 = 6.01 gpd) A higher product viscosity will reduce the output. Pressures lower than the
pump’s rating can increase output.
