IWAKI PUMPS EHN-R, Instruction Manual

Page: 39 / 92

39
Ope
ra
tio
n
Before operation
Flow rate, stroke rate and stroke length
Precautions of fl ow rate adjustment
• When back pressure is high
Set stroke length to 100% and adjust the fl ow by changing a stroke rate.
• When the fl ow rate per shot greatly in fl uences the reaction in neutrali-
zation or titration application
Shorten the stroke length to reduce the fl ow rate per shot. And then adjust the
fl ow by changing a stroke rate.
• When pumping gaseous liquid such as sodium hypochlorite (NaClO)
and hydrazine solution (N
2
H
2
O
2
)
Set stroke length to 100% and adjust the fl ow by changing stroke rate.
Air lock may occur when stroke length is set short.
■
Stroke rate adjustment
Stroke rate can be set by keypad operation.
The stroke rate can be programmed from 1 to 360spm (1 to 300spm for VH/
PH-V).
The relation between a fl ow rate* and stroke rate is shown as below.
B type C type
* The fl ow rate described on the
nameplate is at 100%.
Fixed stroke rate
100
%
75
50
25
0
25 50 75 100
%
Di
sc
h
a
rg
e c
a
p
a
ci
ty
Stroke length adjustment
360spm
(Stroke rate is fixed at 100%.)
270spm
(Stroke rate is fixed at 75%.)
180spm
(Stroke rate is fixed at 50%.)
Fixed stroke rate
100
%
75
50
25
0
25 50 75 100
%
Di
sc
h
a
rg
e c
a
p
a
ci
ty
Stroke length adjustment
360spm (VH/PH-V:300spm)
(Stroke rate is fixed at 100%.)
270spm (VH/PH-V:225spm)
(Stroke rate is fixed at 75%.)
180spm (VH/PH-V:150spm)
(Stroke rate is fixed at 50%.)
Fixed stroke length
100
%
75
50
25
0
180 360
spm
D
isc
harge
c
apac
it
y
Stroke rate adjustment