DUNGS Pressure Switch ÜB/NB…A4 Series
The pressure limiters ÜB…A4 and NB… A4 are adjustable pressure switches as per EN 1854 for automatic burner controls. They are suitable for switching a circuit on, off or over on changes in actual pressure value relative to the set reference value. The reference value (switching point) is adjusted on a setting wheel provided with a scale. Test nipple integrated in metal housing as standard.
Pressure monitoring in firing, ventilation and air-conditioning systems. Suitable for gases of families 1,2,3 and other neutral gaseous media.
Max. Operating pressure: 500/600 mbar
Model Versions of DUNGS ÜB…A4, NB…A4 pressure limiters are the control unit responds to pressure. Interlock is performed when the set reference value is exceeded or undershot. The “Locked” switching state is indicated by a glow lamp. Restart is only possible by activating the reset button on the setting wheel of the pressure limiter after the operating pressure is attained :
- ÜB…A4: Switches and locks when the set pressure is exceeded.
- NB…A4: Switches and locks when the set pressure is undershot.
| ÜB..A4 Model : | Setting range [mbar] | Degree Protection |
| ÜB 50 A4 | 5 mbar – 50 mbar | IP 54 |
| ÜB 150 A4 | 30 mbar – 150 mbar | IP 54 |
| ÜB 500 A4 | 50 mbar – 500 mbar | IP 54 |
| NB..A4 Model : | Setting range [mbar] | Degree Protection |
| NB 50 A4 | 5 mbar – 50 mbar | IP 54 |
| NB 150 A4 | 30 mbar – 150 mbar | IP 54 |
| NB 500 A4 | 50 mbar – 500 mbar | IP 54 |
