ETATRON D.S. HD-PH, Instruction Manual

Page: 39 / 96

English
ENG
RX pump with an HD-PH pump or to use an pH instrument together with the
pump.
f. Use the FLOW knob (5) to set the number of injections per minute, reducing or
increasing the pump discharge according to requirements. In this connection it
must not be forgotten that adequate time must be allowed for the additive to
become uniformly distributed, otherwise the value read on the display will differ
from the real system state.
All our pumps are tested at their maximum working pressure; consequently,
if the plant is operating at a lower pressure, the maximum discharge of the
pump will be greater than the specified value.
8.4 HD-RX
(
CALIBRATION
)
Disconnect the electrode from the pump and short-circuit the female BNC connec-
tor of the pump by the use of copper wire, then use the plastic screwdriver sup-
plied as part of the kit to turn the potentiometer marked "
∆
0" (17) until the display
reading become 00; if a minus sign appears in front of the zeroes, continue rotating
the potentiometer until it disappears. Then connect the electrode and immerse it in
a buffer solution of well defined mV value, agitate the solution and after a few sec-
onds rotate the potentiometer "mV" (16) until the correct mV value of the buffer
solution is read on the display, bearing in mind that the first digit of the three-fig-
ure display is reserved for the sign (positive or negative); when a 300 mV buffer
solution is used, for example, you will therefore read 30 on the display.
39
P
LANT EXAMPLE
1 Suction hose connection
nipple
2 Delivery hose connection
nipple
12 Electrode cable connector
19 Supply cable
A Power point
B Filter
E Electrode
F Electrode holder
H Suction tank
I Injection pipe fitting
S Plant tank
T Mixer
U Drainage
fig.11
HD-PH
HD-RX
S