MAGDOS
BW 1 02 98 / 4
Verbessernde Änderungen jederzeit ohne Vorankündigung vorbehalten.
JESCO DOSIERTECHNIK GmbH & Co. KG
8. Replacing the diaphragm
The diaphragm can be easily removed and replaced
according to the exploded drawing. To facilitate
removal of the old diaphragm, first set the stroke to
"0" while pump is running. If the diaphragm rod is
turning it can be stopped by means of a locking pin
(JESCO P/N 29379). The drilled hole in the
diaphragm rod can be accessed through the drainage
channel.
Suction valve
Drainage tube
Metering head
Snap ring
Grease diaphragm rod with Molycote.
The deflector plate must rest in the diaphragm rod
groove. Ensure that it is not clamped between the
diaphragm rod and the support plate. If the diaphragm
is supplied with a support plate, clean or replace the
latter before mounting it.
9. Drive solenoids
Depending on the pump version, the solenoid design
differs. The following table shows the coil resistance
at 20°C room temperature. With perfect coils, the
resistance tolerance should not /-5%. If the
resistance is substantially lower, there is a short in
the coil, if the resistance is indefinitely high, the coil
is fused or the wire is broken.
7. Startup
ATTENTION!
Adjust the stroke length only while pump is
r u n n i n g .
1. For first startup, set pump to maximum stroke
frequency or press start key
and allow to
prime. For this purpose, it is advisable to set the
stroke to "10". If the pump doesn't prime, remove
discharge valve and pour water or chemical (if
harmless!) into head. Mount the valve and allow
to prime again (priming aid, item 14, fig. 2 is
recommended).
2. If a venting facility is integrated in the metering
head or is available as separate unit, open it and
wait until liquid escapes. Then close it again. In
the case of effervescent liquids allow the liquid
to escape permanently (approx. 1 drop for
1...3 strokes).
3. When correct operation is achieved, set to
required output and lock adjusting knob. Refer
to the calibration table attached to the pump to
get the stroke length setting for a selected output
(ml/pulse). The back pressure influences are
taken into consideration in the table, and
intermediate values must be interpolated.
Depending on the installation and the chemicals
used, these values may differ and must be
checked under operating conditions.
Example:
Required metering capacity: 0.8 ml/pulse against
8 bar.
The table says H=9.9. Adjust knob "H" accordingly
while the pump is running.
4. In the case of externally actuated pumps (e.g. by
water meters), set pump to "external". Initiate
the water flow by opening a water valve and
check pump pulse rate.
5. The manufacturer of the metering equipment is
not responsible for damages due to excessive or
low flow rates resulting from faulty pump settings
or incorrect and insufficient installation of
peripheral fittings.
Washer
Return spring
Groove for
deflector plate
Discharge valve
Diaphragm
Deflector
plate
Support plate if required
Drilled hole
for
locking pin
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