Siemens OXYMAT 6F - Page 45

Compact Operating Instructions in accordance with EN 61010-1 and EN 60079-0
A5E45779389002-01, 09/2018
45
Pneumatic data of the protective gas
Data values
Enclosure volume
Approx. 50 l
Protective gas
• Inert gas (e.g. nitrogen from a gas cylinder)
• Air from an ex-free zone; prerequisite:
– Free of oil and dust
– Particle size < 40 μm
– Oil content < 5 mg/m³
– Dew point < 2 °C at 0.4 MPa
•
With pressurized enclosure: only inert gas
Duration of pre-purging phase
5 min
Minimum volume for pre-purging
250 l
Flow rate in the pre-purging phase
= 50 l/min. (3 000 l/h)
Min. pressure of protective gas
with non-combustible sample gases
with combustible sample gases
At least 50 Pa rel. (recommended 5 hPa rel.)
At least 50 Pa rel. (recommended 5 hPa rel.) or at least 50 hPa (rec-
ommended 5 hPa rel.) higher than the sample gas pressure if the
latter is greater than atmospheric pressure.
Consumption in operation
with Ex px with leakage compensation
with Ex px with continuous purging
with Ex pz with simplified pressurized enclosure
Max. 3 l/min. (typically: < 1 l/min.)
1 l/min
1 l/min
Max. load on Ex p enclosure
165 hPa (rel.)
Type test pressure on Ex p enclosure
250 hPa (rel.)
Ex px safety equipment
In principle, any Ex px safety equipment with a type examination certificate to ATEX can be used. This safety equipment
must have at least the following features:
● A safety level of at least Category 3 to EN ISO 13849-1 for monitoring during pre-purging, and a safety level of at least
Category 1 to EN ISO 13849-1 for monitoring during operation, or a transferable safety level from another comparable
international standard.
● Settable pre-purging phase; protective gas flow must be ≥ 50 l/min
● Limiting of protective gas pressure during the pre-purging phase: < 165 hPa
● With leakage compensation or continuous purging = 1 l/min (depending on version)
● Connection of protective gas lines: ∅ 10 mm or ∅ 3/8" from/to the analyzer
● Inlet pressure for protective 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 scan
● Only for analyzer version with leakage compensation: Connection facility for key switch with intrinsically-safe scan