Hydrotech MP Series PULSAtron - Manual (Page 19)

19
6. Turn the power on once more and adjust the pump flow to the desired rate (see “Controlling Procedure” below).
7. Always check the calibration of the pump after start-up. It’s best to calibrate the pump under your typical use
conditions.
STROKE LENGTH ADJUSTMENT
M Stroke length can be controlled within 0 to 100% of the
diaphragm displacement. (It should be controlled within 20
to 100% for practical use.)
M Stroke length can be set by means of the stroke length
adjusting knob while the pump is in operation. Do not turn
the knob while the pump is stopped.
Controlling Procedure (for fixed rate):
Proper set points for stroke length should be determined after consideration of the pump and characteristics of
the fluid. The following procedure is recommended from the viewpoint of pump performance.
Note: The closer
the stroke length is to 100%, the better the pump performance will be.
A) Set the stroke length to 100%. Measure the output capacity.
B) Adjust the stroke rate frequency to obtain the desired output. If adjustment by stroke rate alone does
not bring the output low enough, the stroke length may be adjusted to lower the maximum output.
C) Measure the output capacity to ensure that the required value is obtained.
Example Selected Model = LMD4
Set Stroke Length = 100%
Set Stroke Rate = 100%
Output Capacity = 21 GPD*
(Rated Pressure)
Desired Flow = 17 GPD
Adjust Stroke Rate to 81%
Output Capacity
= 17 x 100 = 81% (approx.)*
21
Thus to obtain the desired flow, stroke length is set at 100% and stroke rate
is set at 81% i.e. output capacity = 0.81 x 21 = 17 GPD*
* Check these values by measurement. Output capacity is higher when feeding against less than rated
pressure.
OPERATION BY EXTERNAL INPUT SIGNALS: