RW65_EX_II
ATEX Differential Pressure Gauge (intrinsically safe)
Intrinsically safe differential pressure gauge for use in explosive atmospheres. Category II 1 GD, approved for Zones 0/1/2 and 20/21/22. The only Rixen device approved for direct use in the Ex zone.
- ATEX 2014/34/EU — II 1 GD Ex ia IIC/IIIC T4 Ga Da
- Zones 0, 1, 2 (gas) and 20, 21, 22 (dust)
- Ex ia — Zener barrier / isolating converter required on safe side
- 4–20 mA passive
- Mechanically readable scale without power
- Up to 2 NAMUR contacts on request
- Stainless steel housing (IP66) for offshore on request
Intrinsic safety — what it means in practice
The RW65_EX_II is certified under the intrinsic safety protection concept (Ex ia) — the highest level, which tolerates two simultaneous faults without losing ignition safety. The device itself generates no ignitable energy internally.
At the boundary of an ATEX zone, a separation stage on the safe side is always mandatory, even when the end device is intrinsically safe. Three compatible options: Zener barrier (passive, low cost, requires IS earth), intrinsically safe isolating signal converter (active, galvanically isolated, easier to wire), intrinsically safe power supply (combines supply and isolation).
The RW65_EX_II offers the lowest starting range from 40 Pa among ATEX differential pressure gauges on the market — decisive for cleanroom pressure cascades in the Ex zone, for example in pharma with solvent processes. Add drift-free mechanical measurement: every recalibration in the Ex zone means plant downtime and validation effort — the drift-free principle enables significantly extended intervals and reduces this effort considerably.
