Pressure switches Dungs for special gases and biogas
- These pressure switches LGW A2 SGN, LGW A4 SGV, GW A2 SGV and GW A4 HP SGS are used for biogas and specialty gases applications according to TÜV Octagon approval mark. Suitable for closing, opening or switching over a current circuit when the actual pressure value deviates from the specified pressure setpoint.
- Maximum operating pressure: 500 mbar, setting ranges between 0.4÷150 mbar; GGW A4/2 HP SGS: 2÷8 bar, setting ranges between 0.1÷6 bar.
- Degree of protection IP 65.
- Ambient and medium temperature: -15÷70oC, storage temperature -30÷85oC.
- 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 LGW and GW A2 and up to 80 mbar for GW A4/2 HP SGS.
- Suitable for different types of gases:
- Gases according to DVGW worksheet G 260/1: Gas families 1, 2, 3 (city gas, natural gas, LPG).
- Gases according to DVGW worksheet G 262 (Biogases).
- Special gases, with a different chemical composition.
- Detailed pictures for available models (move the mouse over them to zoom):
Functional description
- Differential pressure switch LGW ... A2 SGN
Differential pressure switch for air, smoke gases, flue gases and flue gases of biogas. The control unit reacts to differential pressure, which connects disconnects or switches a circuit when
exceeding or falling below a set nominal value. The pressure switch works without auxiliary power.
- Differential pressure switch LGW ... A4 SGV
Pressure switch suitable for gases from families 1, 2, 3 according to DVGW worksheet G260/1, biogases according to DVGW worksheet G262 and special gases. Differential pressure switch for air,
smoke, flue gases and flue gas for biogas. The control unit reacts to differential pressure, which connects disconnects or switches a circuit when exceeding or falling below a set nominal value.
The pressure switch works without auxiliary power.
- Pressure switch GW ... A2 SGV
Over-pressure switch for air, smoke, exhaust gases, flue gases of biogas, gases from families 1, 2, 3 according to DVGW worksheet G260/1, biogases according to DVGW worksheet G262 and special
gases. The control unit reacts on over-pressure, which connects, disconnects or switches a circuit when exceeding or falling below a set nominal value. It works without auxiliary power.
- Pressure switch GW ... A4/2 SGS
Over-pressure switch for air, smoke, exhaust gases, flue gases of biogas, gases from families 1, 2, 3 according to DVGW worksheet G260/1, biogases according to DVGW worksheet G262 and special
gases. All gas-bearing parts are made of stainless steel 1.4541. The control unit reacts on over-pressure, which connects, disconnects or switches a circuit when exceeding or falling below a set nominal
value. The pressure switch works without auxiliary power.
Biogas
Biogas is one of the most successful renewable sources of energy. It is formed during an anaerobic fermentation process of organic substances such as liquid manure, plant residues or
slaughtering waste in a fermenter. Biogas is an explosive mixture of methane (50-75%), carbon dioxide (25-50%) and other gas components such as nitrogen, ammonia and hydrogen sulphide.
Owing to its physicochemical properties, biogas atacks metal. This is why the corrosion behaviour must be taken into account when selecting materials.
Dungs standard biogas components, due to their special sealing materials and coatings, are suitable for use with biogas according to DVGW worksheet G 262. They all have the TÜV
Octagon approval mark that applies to media-charged or flue-gas-charged components of fuel ducts and gas equipment of biogas installations operated with biogases and sewage gases
according to DVGW worksheet G 262.
Scope of the type approval:
- Gas equipment safety and functional safety.
- Electrical safety.
- Electromagnetic compatibility (interference immunity).
- Resistance to biogases and flue gases of biogases.
- Technical tightness.
Resistance to biogases and flue gases of biogases
The media-charged parts of the components are free of non-ferrous metals. The resistance of the materials used to biogases and flue gases of biogases was proven by the assessment and the
following tests:
- Medium: biogas. Storage in humid air containing 40% by volume of CO2 (carbon dioxide) at 35oC.
- Medium: biogas. Storage in humid air containing 1% by volume of H2S (hydrogen sulphide) at 25oC.
- Medium: flue gas of biogases. Storage in humid air containing 40% by volume of CO2 (carbon dioxide) and 0.1% by volume of SO2 (sulphur dioxide) at 35oC.
- Barn atmosphere: for applications in aggressive ambient air, for example in chicken coops (ammonia), an additional test was carried out. Suitability was proven in accordance with DIN EN 60730-2-9.
In accordance with Technical Information 4 "Safety Regulation for Biogas Installation" of the German Agricultural Institution for Statutory Accident Insurance and Prevention, Dungs recommends a
weekly inspection.
Special gases
The appliances of the Dungs standard range of biogas components are also suitable for other gas applications that are not gases according to DVGW worksheet G 262. The materials of the
components react differently to the different gas components. These mutual dependencies have a major effect on the reactivity of the gas. This is why an installation specific gas analysis for selecting
the special gas component is absolutely required. Products may have a shorter service life if the gas quality during operation differs from the gas analysis that was carried out. The warranty period for
special gas fittings is limited to 1 year.
| Dungs designation | SGN | SGH | SGV | SGS |
|---|---|---|---|---|
| Material | NBR Nitrile rubber |
HNBR Hydrogenated acrylic nitrile butadiene rubber |
Viton FKM Fluoro elastomer |
"Stainless steel" |
| Substance concentration 100% | Resistance | |||
| Ammonia NH3, cold | GOOD | GOOD | MEDIUM | GOOD |
| Ammonia NH3, hot | MEDIUM | MEDIUM | BAD | GOOD |
| Chlorine Cl2, dry | BAD | BAD | GOOD | GOOD |
| Chlorine Cl2, wet | BAD | BAD | GOOD | BAD |
| Fluorine F2, dry | BAD | BAD | GOOD | GOOD |
| Naphtaline C10H8 | MEDIUM | MEDIUM | GOOD | GOOD |
| Octane C8H18 | MEDIUM | MEDIUM | GOOD | GOOD |
| Ozonz O3 | BAD | MEDIUM | GOOD | GOOD |
| Propane C3H6 | BAD | BAD | GOOD | GOOD |
| Hydrogen sulphide H2S, wet | BAD | BAD | MEDIUM | GOOD |
| Tar | BAD | BAD | GOOD | GOOD |
Landfill gas: Owing to its constantly changing gas compositions, landfill gas is excluded from the standard biogas components certification. Resistance can't be ensured.
Technical specifications pressure switches
| Pressure switch type | Code | Setting range (mbar) | pmax (mbar) | Adjusting tolerance min (mbar) | Adjusting tolerance max. | Δpmax (mbar) | Medium p(+) | Medium p(-) |
|---|---|---|---|---|---|---|---|---|
| LGW 3 A2 SGN | 247964 | 0.4 ÷ 3.0 | 500 | ±0.1 | ±15% | ≤0.3 | air | air |
| LGW 10 A2 SGN | 248247 | 2.0 ÷ 10 | ±0.2 | ≤0.5 | ||||
| LGW 50 A2 SGN | 255574 | 2.5 ÷ 50 | ±0.75 | ≤1.5 | ||||
| LGW 150 A2 SGN | 248248 | 7.0 ÷ 150 | ±2.0 | ≤5 | ||||
| LGW 10 A4 SGV | 246749 | 2.0 ÷ 10 | 500 | - | ±15% | ≤1.5 | special gas air |
air |
| LGW 150 A4 SGV | 246557 | 7.0 ÷ 150 | - | ≤5 | ||||
| GW 10 A2 SGV | 248244 | 2.0 ÷ 10 | 500 | - | ±15% | ≤1.5 | special gas air |
- |
| GW 150 A2 SGV | 248245 | 7.0 ÷ 150 | - | ≤5 |
Air also means flue and exhaust gas.
| Pressure switch type | Code | Setting range (bar) | pmax (bar) | Adjusting tolerance max. | Δp (bar) | Medium p(+) |
|---|---|---|---|---|---|---|
| GW 500 A4/2 HP SGS | 255569 | 0.1 ÷ 0.5 | 2 @ 0.1÷0.15 bar 5 @ 0.15÷0.5 bar |
±15% | ≤0.03 | special gas air liquid |
| GW 2000 A4/2 HP SGS | 255570 | 0.4 ÷ 2.0 | 5 | ≤0.05 @ 0.4÷1.0 bar ≤0.10 @ 1.0÷2.0 bar |
||
| GW 6000 A4/2 HP SGS | 255571 | 1.0 ÷ 6.0 | 8 | ≤0.30 |
Dimensions pressure switches (mm)
Differential pressure switches LGW A2 SGN:
For the images that aren't clear move the mouse over them to zoom.
Differential pressure switches LGW A4 SGV:
Pressure switches GW A2 SGV:
Pressure switches GW A4/2 HP SGS:
Type key pressure switch
For the images that aren't clear move the mouse over them to zoom.
Prices pressure switches for special gases
| Code | Type | Prices without VAT |
|---|---|---|
| 247964 | Pressure switch LGW 3 A2 SGN Au-M-V9 st-se | 0.00 |
| 248247 | Pressure switch LGW 10 A2 SGN Au-M-V9 st-se | 0.00 |
| 255574 | Pressure switch LGW 50 A2 SGN Au-M-V9 st-se | 0.00 |
| 248248 | Pressure switch LGW 150 A2 SGN Au-M-V9 st-se | 0.00 |
| 246749 | Pressure switch LGW 10 A4 SGV Au-M-MS9-V0-VS3 st-se | 0.00 |
| 246557 | Pressure switch LGW 150 A4 SGV Au-M-MS9-V0-VS3 st-se | 0.00 |
| 248244 | Pressure switch GW 10 A2 SGV Au-G3-V12 st-se | 0.00 |
| 248245 | Pressure switch GW 150 A2 SGV Au-G3-V12 st-se | 0.00 |
| 255569 | Pressure switch GW 500 A4/2 HP SGS Au-M-V0 st-se | 0.00 |
| 255570 | Pressure switch GW 2000 A4/2 HP SGS Au-M-V0 st-se | 0.00 |
| 255571 | Pressure switch GW 6000 A4/2 HP SGS Au-M-V0 st-se | 0.00 |
In case the price is missing or for a list of discounts contact
us directly to receive an offer.