Differential pressure switches for gas, air, flue and exhaust gases
GGW…A4
GGW…A4-U
GGW…A4/2
GGW…A4-U/2

Technical description
The differential pressure switch GGW… A4 is an adjustable gas-differential pressure switch as per EN 1854 for automatic burner controls. It is 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. The test nipple is integrated in metal housing as standard.

Applications
Differential pressure switch in furnace, ventilation, and air conditioning applications. Differential pressure switch: Suitable for employment with gas family 1, 2, 3, and other, neutral, gaseous media as well as air, smoke and exhaust gases. It does not contain any non-ferrous metals, suitable for gases of up to max. 0.1 vol % H2S, dry.

Certifications
EC type testing certificate as per:
• EC-Gas Appliances Regulation
• EC-Pressure Equipment Directive Pressure switches class ''S'' as per EN 1854.

Approvals in other important gasconsuming countries.

Function
Differential pressure switch operating in the over- and under-pressure ranges. The differential pressure acts on the membrane, pressing it against the force of the adjusting spring and against the microswitch. The pressure switch operates without outside power.