Especially suitable as a pressure monitor or pressure limiter for fuel gases (DVGW work sheet G 260) and liquid fuels (e.g. fuel oil), as well as for steam systems according to TRD 604 and hot-water systems to DIN EN12828, systems in accordance to DIN EN12952-11 and DIN EN12953-9. The DWR is used to monitor maximum and minimum pressures. This pressure switch is "of special construction" and has been tested with 2 million operating cycles. TÜV and DVGW tests exists.
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Pressure switches of the DNS series and suitable for monitoring and controlling pressures in chemical plants, process engineering and any situationwhere the pressure of aggressive liqui sand gases must be monitored.
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This universal pressure switch can be used in general mechanical engineering and the printing machine industry, as well as in pneumatics and hydraulics.
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FEMA differential pressure monitors are suitable for monitoring and controlling differential pressures, flow monitoring and automatic control of filter systems. A double chamber system with stainless steel bellows of Perbunan diaphragm detects the difference between the two applied pressures. The desired switching pressure is continuously adjustable within the ranges mentioned in the product summary. All differential pressure monitors can also be used in the vacuum range. The switching differential is not adjustable.
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FEMA negative pressure switches detect the pressure difference relative to atmospheric pressure. All data relating to the switching pressure ranges and thus also the scale divisions on the switching devices are to be understood as the difference in pressure between the releant atmospheric pressure and the set switching pressure. The "zero" reference point on the scale of the unit corresponds to the relevant atmospheric pressure.
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For overpressure monitoring in Ex-applications of fuel gases. Degree of Ex-protection: Ex II 2G Ex d e IIC T6 Gb, Ex II 1/2D Ex ta/tb IIIC T80 oC Da/Db
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EX/ATEX Pressure Switches – Safe Switching in Hazardous Areas
EX/ATEX pressure switches supervise overpressure, vacuum, or differential pressure in Zones 0/1/2 (gas) and Zones 20/21/22 (dust), depending on the model as intrinsically safe (Ex i), flameproof (Ex d), or increased safety (Ex e). They switch reliably without electronic chatter, are immune to EMC, and suit hydraulics, pneumatics, process gases, solvents, and dust atmospheres. Options include tamper-proof setpoints, adjustable hysteresis, IP66/IP67, stainless wetted parts, and extended temperature ranges.
ICS Schneider Messtechnik supports zone/category selection, protection concepts, material/seal choice, conformity/marking, as well as installation, commissioning, and periodic testing.
FAQ on EX/ATEX Pressure Switches
Answers on protection types, zones/categories, wiring, hysteresis, media compatibility, temperature classes, and documentation.
Which explosion protection types are common?
Typically Ex ia/ib (intrinsic safety) for signal loops with associated barriers, Ex d (flameproof enclosure) for higher switching loads within hazardous areas, and Ex e (increased safety) for terminals/enclosures.
How do I read the ATEX marking?
Example: II 2G Ex d IIC T6 Gb → Group II (industry), Category 2G (Zone 1), protection Ex d, gas group IIC, temperature class T6, EPL Gb. For dust, e.g. Ex tb IIIC T85°C Db.
Which zones can be covered?
Depending on device and protection: Zones 0/1/2 (gas/vapour/mist) and Zones 20/21/22 (dust). Ensure the category (1/2/3) matches the zone.
What must be considered for electrical connection?
For Ex i: use an associated barrier/isolator, match entity parameters (Uo/Io/Po to Ui/Ii/Pi). For Ex d: use approved cable glands, torque covers properly, no unauthorized modifications.
How do I choose materials and seals for media in Ex zones?
316L stainless steel as default; for aggressive media consider Hastelloy®/Monel®. Select seals (FKM/EPDM/PTFE) per medium/temperature. Oxygen service requires special cleanliness.
Which temperature class (T-class) applies?
The device’s surface temperature must remain below the medium’s ignition temperature (e.g., T6 ≤ 85 °C). Consider ambient/media temperature and load.
Are adjustable hysteresis versions available in Ex?
Yes, depending on series. Adjust per manual; for safety functions choose plombable or factory-fixed setpoints where required.
How do I protect against pressure spikes and heat in Ex areas?
Use an Ex-approved snubber/restrictor for surges and a siphon/cooling element for steam/hot media. All accessories must be certified.
What process connections are typical?
| Connection | Standard | Application |
|---|---|---|
| G 1/4, G 1/2 | ISO 228 | General industry |
| ¼″ NPT, ½″ NPT | ASME | Oil & gas / US |
| Flange / hygienic | EN/ASME, Tri-Clamp | Process/CIP-SIP (with diaphragm seal) |
How often should I test/calibrate in Ex areas?
Guideline annually; for safety circuits semi-annually/quarterly. Document as-found/as-left, check tightness, insulation, labeling.
Can Ex pressure switches be used in SIL loops?
Yes, if manufacturer SIL data (PFH/PFD, SFF) are available and the complete loop (sensor-logic-final element) is designed and verified accordingly.
What IP ratings are available?
Depending on model IP65–IP67/69K. Choose higher ratings for dusty/wet environments and use proper glands and gaskets.
What belongs in the Ex documentation?
ATEX/IECEx certificates, DoC, zone/category assignment, wiring diagram, temperature/load data, installation/operation manual, and test records.
Do you support selection and commissioning?
Yes—from zone/category, protection concept, materials/seals and barriers to documentation & acceptance.