Purging - Siemens LDS 6 Operating Instructions Manual

Technical Data

8.3 Purging

8.3 Purging
Conditions of purging media
As medium nitrogen is permissible for purging the sensor side. Nitrogen, steam, air and
gases which are not subject to the pressure equipment directive Cat. 2 are permissible as
purging gases for the process side.
Table 8- 12
Purging with instrument air, N2
Pressure at purging inlet
Maximum overpressure in the sensor
Quality
- Instrument air
- Nitrogen
Maximum flow rate
Dew point
Table 8- 13
Blower purging
Maximum counter pressure
Maximum flow rate
Power consumption
Degree of protection (fan)
Table 8- 14
Steam purging
Steam conditioning
Maximum temperature
Minimum pressure
Maximum pressure
88
Purging with air and nitrogen
Blower purging
Steam purging
200 ... 800 kPa
< 500 hPa
free of oil and water
Purity better than 99.7 %. For oxygen
measurements, an O content < 0.01 % is
2
recommended in the purging gas (optical path
length ≥ 1 m, min. 5 % oxygen in the process
gas)
500 l/min
Benchmark: ≤10 °C,
condensation on the optics must be avoided
4 kPa
350 l/min
370 W
IP54
Overheated
240 °C
> 400 kPa
1 600 kPa,
refers to a volume flow of approx. 1 100 l/min
Operating Instructions, 01/2009, A5E00295894-05
LDS 6