FUNCTION
The pressure switch DG switches in the event of increasing or decreasing pressure. Once the set switching point is reached, a micro switch is activated in the DG which is designed as a change-over contact.
Positive pressure measurement
Positive pressure measurement is designed, for example, for checking the fan function or
measuring the min./max. gas pressure. The positive pressure is measured in the lower diaphragm chamber, port 1 or 2. The upper diaphragm chamber is ventilated via port 3 or 4.
Negative pressure measurement
Negative pressure measurement (air, flue gas) is designed, for example, for monitoring a suction pressure blower. The negative pressure is measured in the upper diaphragm chamber, port 3 or 4, and on DG..T via port 4. The lower diaphragm chamber is ventilated via port 1 or 2. In the case of DG..I,
the negative pressure (gas, air, flue gas or biogas) is measured in the lower diaphragm chamber, port1 or 2. The upper diaphragm chamber is ventilated via port 3 or 4.
Differential pressure measurement
Differential pressure measurement is designed for safeguarding an air flow rate or for monitoring filters and fans, for instance. DG..U, DG..H, DG..N: the higher absolute pressure is connected to port 1 or 2, and the lower absolute pressure to port 3 or 4. The remaining ports must be tightly plugged.