Air Purging System (Optional) - Siemens Sitrans LR400 Instruction Manual

Air Purging System (Optional)

For more frequent cleaning, a purging system can be installed between the flange and the
horn antenna. The system provides an 1/8" inlet (female thread) on the flange where
cooling air or cleaning fluid passes through the flange and exits the inside of the horn to
clean it. The customer will supply the purging medium by manual or automatic valve
system. This option is only available with universal flange for purging shown on page 14.
Notes:
• The Air Purge feature should not be activated with a dust cap in place.
• Purge duration, pressure, and interval, will vary with each application. It is the user's
responsibility to determine the requirements depending on the application and
cleaning required.
• Short duration bursts of high pressure provide more effective cleaning than
continuous low pressure air.
• Some dust particles are highly abrasive and can be drawn into the inside of the horn
during purge cleaning, damaging the internal PTFE emitter of the antenna. A
replacement kit is available from your local Siemens Milltronics representative.
• It is the customer's responsibility to ensure that any vacuum or pressure in the
measured vessel is maintained, considering the hole that passes through the
process connection and SITRANS LR400 antenna system.
Air Pressure
20
40
60
80
90
7ML19985FH06
Air Consumption
(Flowrate versus applied pressure)
Approximate inlet volume flow rate (standard cubic feet/minute)
SITRANS LR400 (7ML5421) – INSTRUCTION MANUAL
5 SCFM
6 SCFM
8 SCFM
9 SCFM
10 SCFM
Page 13