AO2020-URAS26  连续气体分析仪AO2000系列

AO2020

The thermostat chamber that encloses the actual analyzer is flushed with purgegas at a slight positive pressure. The curtain of inert gas formed in this mannerencapsulates all portions of the sample gas path. in the event of a leak in thesample gas path, the purge gas flows into the analyzer and, in this way, preventsflammable gases from emerging from the analyzer module.
The purge gas is introduced into the thermostat chamber at a flow rate of 15 to20 l/h and a positive pressure of p≤ 50 hPa. As a result of the capillary, a positivepressure of p.=7 to 20 hPa is established. The purge gas flow rate is measuredby a flow sensor located downstream from the capillary in the sample gas path.The outlet of the flow sensor is open to atmospheric pressure.The signal from the flow sensor is monitored and evaluated by a function blockapplication (see section “Monitoring the purge gas flow rate”, page 12).

Purge gas at a slight positive pressure flows through the sample cell windows ofthe safety cell. in the event of a leak in the sample gas path, e.g. cracking of thesample cell window, the purge gas flows into the sample cell and, in this way,prevents flammable gases from emerging from the analyzer module.The purge gas is introduced to the purge curtain at a flow rate of 15 to 20 l/h and aslight positive pressure of p,≤ 50 hPa. As a result of the capillary, a positivepressure of p.=7 to 20 hPa is established. The purge gas flow rate is measuredby a flow sensor located downstream from the capillary in the sample gas path.The outlet of the flow sensor is open to atmospheric pressure.
The signal from the flow sensor is monitored and evaluated by a function blockapplication (see section “Monitoring the purge gas flow rate”, page 12).