Siemens SIPROCESS GA700 Compact Operating Instructions page 99

Table 9-47 Pneumatic data of purging gas
Pneumatic data of purging gas
Enclosure volume
Purging gas
Duration of pre-purging phase
Minimum pre-purging volume
Flow rate in the pre-purging phase
Min. purging gas pressure
Minimum flow rate
Max. load on Ex p enclosure
Devices in explosion-proof design
Compact Operating Instructions, 01/2022, A5E35134047-11
9.3 Technical specifications for operation in hazardous areas
Approx. 60 l
• Inert gas (e.g. nitrogen from a gas cylinder)
• Air from an ex-free zone; prerequisite:
– Oil and dust free, particle size < 40 μm
– Oil content < 5 mg/m³
– Dew point < 2 °C at 0.4 MPa
• When analyzing non-combustible gas mixtures with oxygen content > 21%: only
inert gas
10 min
600 l
60 l/min (3 600 l/h)
50 Pa (rel.)
For Ex p with continuous purging
< 110 hPa (rel.)
Technical specifications
1 l/min
99