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Device Overview and Control elements / Function Description
4.2
Control elements
Please acquaint yourself with the gamma/ L control elements with the help of the “control
elements and key functions” overview!
Indicators
The LCD display supports the operation and setting of the gamma/ L with a range of indicators:
Set
Flow
Calib
Mem
Error
Pause
Aux
Stop
The indicators are interpreted as follows:
Symbol for P key:
The gamma/ L is in settings mode.
Close symbol:
In a continuous display: lock (if code has been set).
In settings mode: indicates access to code menu.
Stop:
The gamma/ L has been stopped using the STOP/START key.
Pause:
The gamma/ L has been stopped using the “pause” function
(external).
Aux:
The gamma/ L is pumping at the auxiliary frequency. In AUX
menu: the gamma/ L is in the AUX menu.
Error:
A fault has occurred and the pump has been stopped.
Mem:
An additional “memory” function has been set in the “contact”
and “batch” operating modes.
In CNTCT or BATCH menus (“mem” flashes): the memory
function can be set
Calib:
The gamma/ L is in the CALIB menu.
n a continuous display (“calib” flashes”): more than ± 10 %
deviation of stroke rate from value at the moment of calibration.
Flow:
The gamma/ L is in the FLOW menu.
Set:
The gamma/ L is in the SET menu.
Command symbol:
The number of strokes reached is above the maximum value
(99999) that can be shown in the LCD display
5
Function Description
Function principle
Dosing takes place as follows: the dosing diaphragm is forced into the liquid end; the pressure
in the liquid end causes the suction valve to close and the chemical flows out of the liquid end
through the discharge valve. The dosing diaphragm is then forced back out of the liquid end.
The vacuum in the liquid end causes the discharge valve to close and fresh chemical flows into
the suction valve in the liquid end. This concludes one operating cycle.
The dosing diaphragm is driven by an electronically controlled electrical solenoid.
Feed rate
The feed rate is determined by the stroke length and the stroke rate.
The stroke length is set between 0 - 100 % using the stroke length adjusting knob. Optimum
dosing reproducibility is achieved by setting the stroke length to between 30 - 100 % (SEK type:
50 - 100 %)!
The stroke rate is set using the arrow keys (not in “analogue” operating mode) to between
0 - 180 strokes/min.
Self-bleed function
Pumps with self-bleed function (= SEK types) can operate a prime action even when the
discharge tubing is closed, discharging existing air through a bypass valve. These pumps can
release gas even during operation, irrespective of the actual operating pressure.
An in-built pressure maintenance valve allows accurate dosing even in depressurised states.