Operating Instructions

Table Of Contents
This option is only available with the universal flange for purging.
Note
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 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 LR260 antenna system.
Air Consumption (Flow rate versus applied pressure)
Air Pressure (psi)
2)
Approx. inlet volume flow rate
20
3)
5 SCFM
40
3)
6 SCFM
60 8 SCFM
80 9 SCFM
90 10 SCFM
Recommended 90 to 110 psi for effective cleaning with inlet flow of 10 SCFM
1)
The purge connection is closed by the manufacturer, using a 1/8" plug.
When the plug is removed to connect a purging system, the operator is responsible for
ensuring that the purging circuit conforms to "Ex" requirements: for example, by fitting an
NRV valve.
Installing/mounting
4.3 Proper mounting
SITRANS LR260 with mA/HART
32 Operating Instructions, 11/2019, A5E32337683-AD