Pneumatic Data Of The Protective Gas; Eex P Safety Device - Siemens CALOMAT 6 Additional Equipment Manual

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2.4

Pneumatic data of the protective gas

Housing volume:
Input pressure (to supply the

EEx p safety device):

Protective gas:
Duration of pre-purging phase:
Flow during pre-purging phase
Min. protective gas pressure:
Consumption during operation:
Max. load on the EEx p housing:
Type test pressure on the EEx p housing:
2.5 EEx p safety device
In principle, any EEx p safety device with a type examination certificate to ATEX can be used. It must
have at least the following features:
- A safety level of at least category 3 to EN 954 for monitoring during pre-purging, and a safety level of
at least category 1 to EN 954 for monitoring during operation, or a transferable safety level from
another comparable international standard.
- Adjustable pre-purging phase; purging gas pressure must be ≥ 50 l/min
- Limiting of purging gas pressure during the pre-purging phase: < 165 hPa
- Compensation of losses resulting from leaks or continuous purging ≥ 1 l/min (depending on version)
- Connection of purging gas lines: 10 mm or 3/8" diameter from/to the analyzer
- Input pressure for purging gas supply: 0.2...0.4 MPa
- Relay contacts for all-pole isolation of the analyzer's power supply
- Relay contacts for disconnecting additional equipment (e.g. Ex isolating relay)
- Connection facility for key switch with intrinsically-safe scann
- Only for analyzer versions with "Compensation of losses resulting from leaks": connection facility for
pressure switch with intrinsically-safe scanning
E-6
Approx. 50 l
0.2...0.4 MPa (2...4 bar)
- Inert gas (e.g. nitrogen from a gas cylinder)
- Air from an ex-free zone; prerequisite:
free from oil and dust, particle size <40 µm, oil
content <5 mg/m³ and dew point <2 °C at 0.4 MPa
5 min
≥ 50 l/min (3000 l/h)
- With non-combustible sample gases: 50 Pa (rel.)
- With combustible sample gases: 50 Pa (rel.)
plus additional 5 hPa above sample gas pressure
< 3 l/min (typically: < 1 l/min) for EEx p with
compensation of losses resulting from leaks;
≥ 1 l/min for EEx p with continuous purging
165 hPa (rel.)
250 hPa (rel.)
Additional Equipment Manual EEx p
Order No.: A5E 000 58873-02