Field Instruments

General

The GW…A4 pressure switch is an adjustable pressure switch as per EN 1854 (GW 6000 A4 as per DIN 3398T3) for burners. It is suitable for closing, opening or switching over a current circuit when the actual pressure value deviates from the specified pressure setpoint. The specified pressure setpoint (operating point) is set at a setting wheel using a scale.

Application

Pressure monitoring in burner control systems Suitable for gases of gas families 1,2,3 and other neutral gaseous media, as well as air, flue gases and combustion products. GW 500 A4: Free of non-ferrous metals, suitable for gases up to max. 0.1 % by vol. H2 S, dry.

Specifications

• Make: DUNGS
• Part Number: GW 500 A4/2
• Order Number: 238 572
• Setting range in. W.C: 100 - 500 ± 15 %
• Max. Betriebsdruck: GW 500 A4     600 mbar (60 kPa)
• Pressure connection: – p+: centrally on underside of housing, G 1/4 internal thread to ISO 228: Gas or air Special version: additional G 1/4 internal thread at side.
• Switching voltage
  • • • Ag contact AC eff. min. 24 V max. 250 V
      • DC min. 24 V max. 48 V
      • Au contact DC min. 5 V max. 24 V
• Switching current:
  • • •  Ag contact AC eff. min. 20 mA max. 6 A with cos ϕ 1
      •  AC eff. max. 3 A with cos ϕ 0,6
      •  DC min. 20 mA max. 1 A
      •  Au contact DC min. 5 mA max. 20 mA
• Electrical connection: Plug connection for line sockets as per DIN EN 175 301-803, 3-pin with protection contact

• Adjustment: With rising pressure and installed in a vertical position. Optional rising or dropping pressure adjustment on-site possible. Note switch point change if installation position changes
• Setting tolerance: ±15 % switch point deviation based on the setpoint and with unit installed in a vertical position
• Degree of protection: IP 65 as per IEC 529

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