Pressure limiter
ÜB…A4 and NB…A4
Technical description
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.
Application
Pressure monitoring in firing, ventilation and air-conditioning systems. Suitable for gases of families 1,2,3 and other neutral gaseous media.
Approvals
EC type testing certificate as per:
• EC-Gas Appliances Regulation
• EC-Pressure Equipment Directive
Approvals in other important gasconsuming countries. Special designs for the North American market with UL , FM and CSA registrations.
Functional description
Single-acting pressure limiter in pressure range.
The pressure limiters work without using any auxiliary power.
ÜB…A4, NB…A4 pressure limiters
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.
