Purging - Siemens LDS 6 Operating Instructions Manual

Technical specification

7.4 Purging

LDS 6, Optics Housing CD 6 for use in
hazardous areas
Permissible ambient humidity
Optics housing/process interface
Measurement path length
Dust load
7.4 Purging
Conditions of purging media
For purging the optics housing side, nitrogen and instrument air are permissible as purging
media. 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.
Purging with instrument air, nitrogen
Maximum flow of optics housing
purging
Maximum overpressure in the optics
housing
Quality
- Instrument air
- Nitrogen
Maximum flow
Dew point
Blower purging
Maximum counter pressure
Maximum flow rate
Power consumption
Degree of protection (fan)
Steam purging
Steam conditioning
Maximum temperature
Minimum pressure
Maximum pressure
40
Specification
<95 % relative humidity, non-condensing
DN65/PN6 and ANSI 4"/150 lbs.;
DN80/PN16 (only as pressure-resistant variant)
0.3 ... 12 m (1 ... 39 ft) depending on measuring conditions
(dust load)
Depending on particle size distribution and optical path length
5 l/min
<500 hPa (7.25 psi)
Free of oil and water (dew point 10 K below minimun ambient
temperature)
Purity better than 99.7%
500 l/min
10 K below minimum ambient temperature or better,
condensation on the optics must be avoided
40 hPa (0.6 psi)
850 l/min (224.5 US gal/min)
370 W
IP54, cover required to protect against rain
Overheated
240 °C (464 °F)
>4 000 hPa (58 psi)
16 000 hPa (232 psi),
refers to a volume flow of approx. 1 100 l/min (291 US gal/min)
Operating Instructions, 01/2022, A5E01134377-05
LDS 6, Optics Housing CD 6