Level control ATNP

on the air bubble injection principle

ATNP 3

The ATNP Level Control works on the air bubble injection principle and, according to type, is used to actuated 1 to 3 pumps plus an alarm signal in non-pressurized tanks and shafts. Depending on the type, the appliance is equipped with a total of up to 5 contacts, up to four of which can be steplessly adjusted from about 400 mm to about 2200 mm (measured upwards from the bottom edge of the pressure bell). The PUMP OFF contact is permanently set at about 180 mm (measured upwards from the bottom edge of the pressure bell). The pressure is registered in the bell, which is connected by an air hose to the level control unit. The PVC bell should be mounted at the requisite height (180 mm below the PUMP OFF switching position) using the 2" clip supplied with the unit.

The "No. 1 pump ON", "No. 2 pump ON", "No. 3 pump ON" and "Alarm" switching positions can be set as required by turning the knobs mounted on the front panel. The height setting is shown on a scale.

The switching contacts are actuated by the air pressure set up in the bell by the rising liquid level. In order to replace the air escaping over a period, air is pumped into the bell at intervals of about 50 seconds, the surplus being allowed to escape. The reduced operating time prolongs the life of the air pump diaphragm serveral times over, and the amount of air injected is small enough to avoid an excessive surplus.

Mounting:
The unit should be suspended vertically in the switch cabinet. For direct wall-mounting, the control unit can, on special request, also be supplied in a suitable casing.