7.3 Water meter installation
The MAGDOS DE/DX can be controlled by any commercially available contact water meter. To avoid interfer-
ence or faulty pulses, the dosing pump must not be fixed directly to the water meter. Direct mounting is
acceptable if a spacer is used, which guarantees a distance of 50 mm (refer to Section 7.8 Installation
Examples). The pump should therefore be mounted on a chemical supply tank or a wall bracket. The pulse
sequence of the water meter must be tuned to the maximum stroke frequency of the dosing pump (Section
5 Technical Data).
7.4 Electrical connection
DANGER!
Risk of burns. Shock wave: parts may fly off and cause fatal injury. Under no circumstances must the
MAGDOS DE/DX be used in potentially explosive atmospheres.
The electrical connection of the dosing pump must be made in accordance with locally applicable require-
ments and may only be carried out by technical personnel.
NOTE!
The dosing pump must be plugged into a grounded power outlet. The 230 V version of the MAGDOS DE/DX
is connected by a shockproof earthing-pin plug. The 115 V version is equipped with a UL/CSA connector.
NOTE!
The dosing pump is double insulated and earthed.
Signal cables must not be laid parallel to high-voltage current lines or mains cables. Lay supply and signal
lines in separate channels. An angle of 90° is required at line crossings. If signal lines are longer than 2 m,
shielded cables must be used.
7.5 Level monitoring
If a level monitor is connected, the jack plug has to be covered by a plastic sleeve in order to maintain the
protection class. The required sleeve is part of the level monitor (also in combination with a suction line).
With the level monitor connected, the dosing pump stops if the chemical level in the supply tank is low, in
order to prevent air bubbles from entering the suction line and the dosing head. The red LED is lit. As soon
as the level contact closes again, the dosing pump restarts.
The level sensor must be designed as a max. N.O. contact.
MAGDOS DE/DX is equipped with a low level alert. When the first contact opens, the red LED begins to
flash, the dosing pump continues delivering medium and the alarm relay (optional) is activated. The pump
only stops when the second contact opens. The red LED lights continuously.
The "low level alert" function is not available when using a 2-pin connector and a simple float switch.
NOTE!
A dummy plug must be attached if a float switch is not connected. The dosing pump is delivered with a
dummy plug already attached. If a float switch is to be connected, the dummy plug has to be removed
before inserting the jack plug.
MAGDOS DX
The level LED has a dual function in connection with this dosing pump. It also begins to flash when the input
signal drops below 4 mA in 4…20 mA mode (cable break).
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