Pulsafeeder PULSAtron Series MP EN - Manual (Page 19)

19
STROKE LENGTH ADJUSTMENT
 Stroke length can be controlled within 0 to 100% of the diaphragm
displacement. (It should be controlled within 20 to 100% for practical
use.)
 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.