Field Instruments

General

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.

Application

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 % H2 S, dry.

Specifications

• Make: DUNGS
• Part Number: GGW 3 A4-U/2
• Order Number: 248 690
• Setting range in. W.C: -0,4 - -3 ± 15 %
• Max. operating pressure: 0…-500 mbar (-50kPa)
• Metering connection: Metering connection tube integrated into the metal housing, ø 9
• Pressure connectionStandard: –
  • • • P+: In the center of the underside of the housing, G 1/4 internal thread in accord. with ISO 228: Gas or air.
      •  P+: On the side of the housing with closure screw, G 1/4: Gas or air
      • P-: On the side of the underside of the housing, G 1/8 internal thread in accord. with ISO 228: Gas or air.
• Switching voltage
  • • • DC min. 5 V max. 24 V
      • (AC eff. min. 24 V max. 250 V)
      • (DC min. 24 V max. 48 V)
• Nominal current: DC 20 mA (AC eff. 10 A)
• Switching current:
  • • •  DC min. 5 mA max. 20 mA
      • (AC eff. min. 20 mA max. 6 A cos ϕ 1)
      • (AC eff. min. 20 mA max. 3 A cos ϕ 0,6)
      • (DC min. 20 mA max. 1 A)
• Electrical connection: Standard at screw terminals via cable gland, M20 x 1,5 Special design 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.
• Adjustment tolerance: ± 15% switch point deviation based on the setpoint and with unit installed in a vertical position. Optionally, rising (Ç) or falling (È) adjustment possible on site.
• Deviation: Permissible deviation of the set value ≤ ± 15 % in the service life test according to EN 1854

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