>> ATEX >> Pressure switch: GW A4/2 HP X, GGW A4/2 X, GGW A4-U/2 X


Pressure switch ATEX GW A4/2 HP X Dungs and differential pressure switch GGW A4/2 X

Pressure switch GW A4/2 HP X - GGW A4/2 X Dungs
  • These pressure switches GW A4/2 HP X, GGW A4/2 X and GGW A4-U/2 X are designed for monitoring in burner control systems. Suitable for closing, opening or switching over a current circuit when the actual pressure value deviates from the specified pressure setpoint.
  • The abbreviation ATEX stands for the French term "Atmosphere explosible" and is used as synonym for the two EU directives concerning explosion protection: Equipment directive 94/9/EC and Workplace directive 1999/92/EC. The equipment for Dungs ATEX product range complies with equipment group II, category 3 for gas and dust. It may only be used in zones 2 and 22.
  • Marking: II 3 G Ex nC IIB T6 Gc (gaz) and
    II 3 D Ex tc IIB T 75oC Dc (gas).
  • Maximum operating pressure: GW A4/2 X: 500 mbar, setting ranges between 0.4÷300 mbar; GGW A4/2 HP X: 2÷8 bar, setting ranges between 0.1÷6 bar.
  • Ambient and medium temperature: -15÷70oC, storage temperature -30÷80oC.
  • Switching voltage: DC 5÷24 V; DC 24÷48 V; AC 24÷250 V. Nominal current: DC 20 mA; (AC 10 A).
  • The installation position can change the switching pressure with up to 0.5 mbar for GGW A4/2 X and up to 80 mbar for GW A4/2 HP X.
  • Suitable for employment with gas families 1, 2, 3 and other neutral gaseous media as well as air, flue and exhaust gases. It does not contain any non-ferrous metals, suitable for gases of up to max. 0.1 vol. % H2S, dry.


Functional description

  • Overpressure switch GW ... A4/2 HP X
Pressure switch for applications involving excess pressure. GW A4/2 HP X counteracts the force of the setting spring on micro-switch via the metal bellows. The pressure switch does not require auxiliary power. The switching mechanism reacts to overpressure and closes, opens or switches over a current circuit when the specified setpoint is overshot or undershot. All gas-bearing parts are made of stainless steel 1.4541 and are suitable for biogas applications and aggressive media such as sulfuric acid with concentrations up to 1.0 vol %.
 
  • Differential pressure switch GGW ... A4/2 X si GGW ... A4-U/2 X
The switching apparatus reacts to the difference in pressure between the two pressure chambers [G 1/4 (+) - G 1/8 (-)] and, if the pressure exceeds or drops below the setpoint, activates or switches an electrical circuit.
If the lower pressure is G 1/8 (-) and excess pressure with respect to the atmosphere exists type GGW A4/2 X must be employed. If lower power with the respect to the atmosphere exists GGW A4-U/2 X must be employed.
 
  • Over-pressure switch GGW ... A4/2 X, Pressure connection G 1/4 (+):
The switching apparatus reacts to excess pressure and activates or switches if the pressure exceeds or drops below a setpoint. Simply and efficiently acting pressure switch for the excess pressure range. The pressure connection, G 1/8 (-) must not be closed or blocked.
 
  • Under-pressure switch GGW ... A4-U/2 X, Pressure connection G 1/8 (-):
The switching apparatus reacts to inadequate pressure and activates or switches if the pressure exceeds or drops below a setpoint. Simply and efficiently acting pressure switch for the low-pressure range. The pressure connection, G 1/4 (+) must not be closed or blocked.


Technical specifications pressure switches

Pressure switch type Code Setting range (bar) pmax (bar) Degree of prot. Δp (bar) Medium p(+)
GW 500 A4/2 HP X 251984 0.1 ÷ 0.5 2 @ 0.1÷0.15 bar
5 @ 0.15÷0.5 bar
IP 65 ≤0.03 gas
air
liquid
GW 2000 A4/2 HP X 251985 0.4 ÷ 2.0 5 ≤0.05 @ 0.4÷1.0 bar
≤0.10 @ 1.0÷2.0 bar
GW 6000 A4/2 HP X 251986 1.0 ÷ 6.0 8 ≤0.30

 

Pressure switch type Code Setting range (mbar) pmax (mbar) Degree of protection Δp (mbar) Medium p(+) Medium p(-)
Pressure switch GGW 3 A4 248673 0.4 ÷ 3.0 500 IP 65 ≤0.3 gas
air
gas
air
Pressure switch GGW 10 A4 248276 1.0 ÷ 10 ≤0.5
Pressure switch GGW 50 A4 246176 2.5 ÷ 50 ≤1
Pressure switch GGW 150 A4 248295 30 ÷ 150 ≤3
Pressure switch GGW 3 A4-U 248327 -0.4 ÷ -3.0 -500 IP 65 ≤0.3 gas
air
gas
air
Pressure switch GGW 10 A4-U 240358 -1.0 ÷ -10 ≤0.5
Pressure switch GGW 50 A4-U 246178 -2.5 ÷ -50 ≤1
Pressure switch GGW 150 A4-U 247980 -30 ÷ -150 ≤3
Air also means flue and exhaust gas.


Dimensions GW A4/2 HP X & GGW A4/2 X (mm)

Pressure switches GW A4/2 HP X:
dimensions-GW-A4-2-HP-X-1.jpg dimensions-GW-A4-2-HP-X-2.jpg dimensions-GW-A4-2-HP-X-3.jpg
For the images that aren't clear move the mouse over them to zoom.
SW = wrench width

 

Differential pressure switches GGW A4/2 X & GGW A4-U/2 X:
dimensions-GGW-A4-2-X-1.jpg dimensions GGW A4/2 X - 2 dimensions GGW A4/2 X - 3


Type key pressure switch

Legend Pressure switch GW A4/2 HP X - GGW A4/2 X Schematic Pressure switch GW A4/2 HP X - GGW A4/2 X


Prices for ATEX pressure switches

Cod Model Preturi fara TVA
251984 Pressure switch GW 500 A4/2 HP X Au-M-V0 st-se 0.00
251985 Pressure switch GW 2000 A4/2 HP X Au-M-V0 st-se 0.00
251986 Pressure switch GW 6000 A4/2 HP X Au-M-V0 st-se 0.00
245810 Pressure switch GGW 3 A4/2 X Au-M-MS9-V0-VS3 st-se 0.00
248694 Pressure switch GGW 10 A4/2 X Au-M-MS9-V0-VS3 st-se 0.00
245811 Pressure switch GGW 50 A4/2 X Au-M-MS9-V0-VS3 st-se 0.00
248695 Pressure switch GGW 150 A4/2 X Au-M-MS9-V0-VS3 st-se 0.00
248390 Pressure switch GGW 3 A4-U/2 X Au-M-MS9-V0-VS3 st-se 0.00
248391 Pressure switch GGW 10 A4-U/2 X Au-M-MS9-V0-VS3 st-se 0.00
246180 Pressure switch GGW 50 A4-U/2 X Au-M-MS9-V0-VS3 st-se 0.00
248392 Pressure switch GGW 150 A4-U/2 X Au-M-MS9-V0-VS3 st-se 0.00
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