9 Startup
On startup, vent the system as described in chapter 9.3 “Venting the metering pump“!
CAUTION
If the metering pipe can be shut off, an overflow valve (safety valve) should be installed on
the pressure side, which opens at the maximum permissible pressure level, in order to
protect the metering line. This may prevent the metering pipe from bursting in the event of
an operator error.
Under unfavourable conditions, the pressure may rise to up to three times the nominal
pressure.
NOTE
After 24 hours or operation, the metering head screws are to be re-tightened diagonally
with a torque of approximately 3-4 Nm.
9.1 Switching the pump on/off
Press START/STOP key (min. 2 sec.).
Press START/STOP key (min. 5 sec.).
Abb. 9.1 Inbetriebnahme: Ein- Ausschalten der Pumpe
9.2 Setting of the metering output (mechanical)
The metering rate is adjustable by means of mechanical stroke length
setting between 100% and 30% of the pump's rated capacity
(reproducible accuracy can no longer be guaranteed below 30%).
The adjustment is made via the stroke adjusting button and can only be
performed while the metering pump is in operation.
Fig. 9.2 Setting of the metering output (mechanical)
NOTE
The capacity of the pump must be calibrated in order to determine the metering capacity
precisely. (see chapter 10.4 “Calibration”)
9.3 Venting the metering pump
WARNING
Particular caution is required when handling chemical metering media!
Metering media may escape which may cause skin irritation, depending on their properties.
Therefore, before venting, always observe the product datasheet of the metering medium to
prevent any type of injury!
NOTE
To ensure an optimal suction performance, the stroke length should be set to 100% and the
maximum stroke frequency.
In the event that pump has no suction or insufficient suction, the correct connection must
WARNING
It is only possible to modify the stroke length setting when the pump is running.
Open the vent screw approximately 1 turn
Hold a suitable collection vessel under the vent connection
(see chapter 5
, “Setup”, Fig. 5.1, Pos. 3).
Press the Test key until the metering medium escapes from the venting outlet.
Hold down the Test key for a further 60 seconds to fill the pump head fully with the
product.
Reclose the vent screw.
Press the Test Key again until the metering medium is visible through the metering pipe,
until it reaches approximately 2 cm in front of the inoculation valve.
Close the clear cover which protects the function keys, and seal it if necessary.
If no metering medium enters the metering pipe, repeat the venting.
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