34
Flow rate adjustment
The flow rate can be changed by a stroke rate and a stroke length adjustment.
The stroke rate represents the pump speed in spm (stroke per minute). The stroke rate adjustment is the main
way to adjust the flow rate from the pump.
The stroke length represents the moving distance of the plunger. The widest moving distance is defined as
100% stroke length. The stroke length adjustment is used for determining the optimal flow volume per shot (fine
adjustment of the pump flow).
First adjust a flow rate by stroke rate adjustment. Use stroke length adjustment for the range where stroke rate
adjustment can not reach. Note the optimal stroke length change with operating conditions and liquid charac-
teristics.
Change the stroke rate with the stroke length 100% to the specified level.
See "Stroke rate adjustment" on page 35 and "Stroke length adjustment" on page 36 for detail.
Measure the flow rate.
If the flow rate is lower/higher than the specified level, increase/decrease the stroke rate
and measure the pump flow again.
Change the stroke length for fine adjustment.
Measure the pump flow again to see the specified level is obtained.
■ Flow rate, stroke rate and stroke length
■ Precautions of flow rate adjustment
•
When back pressure is high,
set stroke length to 100% and adjust the pump flow by changing the stroke
rate.
•
When each dose greatly affects a chemical reaction in neutralization or titration application,
shorten
the stroke length to reduce the flow rate per shot. And then adjust the pump flow by changing the stroke rate.
•
When handling liquids that generate gas bubbles (sodium hypochlorite or hydrazine solution),
set the
stroke length to 100% and adjust the pump flow by changing the stroke rate. Note gas lock may occur when
the stroke length is set too short.
Before operation
2
1
3
4
5
B type
Fixed stroke rate
100
%
75
50
25
0
25
50
75
100
%
D
is
c
har
g
e
c
apa
c
it
y
Stroke length adjustment
Stroke rate is fixed at 100%
Stroke rate is fixed at 75%
Stroke rate is fixed at 50%
C type
Fixed stroke rate
100
%
75
50
25
0
25
50
75
100
%
D
is
c
har
g
e
c
apa
c
it
y
Stroke length adjustment
Stroke rate is fixed at 100%
Stroke rate is fixed at 75%
Stroke rate is fixed at 50%
Содержание EHN-B11-NAE
Страница 67: ...67 Specifications ...