Enclosure Purging - Siemens 7MB3000 Series Operating Instructions Manual

Combined operation
5.4 Application planning
Retrofitting example "Suction operation, serial" operating mode for OXYMAT 7/ULTRAMAT 7
When you are using the ULTRAMAT 7 and the OXYMAT 7 analyzer module in serial suction
operation, you must convert the sample gas restrictor of the OXYMAT 7 analyzer module:
Sample gas inlet → Sample gas outlet.
a
b
a
b
c
①
②
③
④
⑤
Figure 5-6
5.4.8

Enclosure purging

Enclosure purging
Gases can escape from the gas path on a very small scale and accumulate over a longer period
of time to dangerous levels. Therefore, the enclosure must be purged with dry, dust-free air or
inert gas when dealing with flammable, toxic or highly corrosive sample gases.
Purge the wall-mounted enclosure with a flow rate of approx. 1 l/min. Purging of the
enclosure can only be dispensed with if non-toxic gases or gas mixtures below the lower
explosive limit (LEL) are introduced into the device. Collect the gas displaced by the purging
using a suitable mechanism. Dispose of the gas in an environmentally friendly way, for
example, via an exhaust pipe.
52
a
b
Sample gas inlet
Reference gas inlet
Sample gas outlet/reference gas outlet
Remove sample gas restrictor from the sample gas inlet of the additional OXYMAT 7 analyzer
module
Install the clamping screw into the sample gas inlet of the additional OXYMAT 7 analyzer module
Install the sample gas restrictor into the sample gas outlet of the additional OXYMAT 7 analyzer
module
Install additional OXYMAT 7 analyzer module
Target configuration: ULTRAMAT 7 and OXYMAT 7 in serial suction operation
Retrofitting of the sample gas restrictors: Example "Pressure operation, serial"
c
Operating Instructions, 07/2023, A5E31930403-AB
Wall-mounted device