User's Manual

7ML19985LY01 SITRANS LR560 (FF) – OPERATING INSTRUCTIONS Page 21
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Installation
Purge Connection
• 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.
1)
Purge airflow
• The purge airflow is designed to create a strong vortex of air that rapidly cleans the
face of the lens.
• The air purge system can clean both dust and moisture off the lens.
• It can be used for periodic cleaning.
Air Consumption (Flow rate versus applied pressure)
Air Pressure (psi) Approx. inlet volume flow rate (SCFM)
a)
20 5
40 10
50 15
80 20
100 25
110 30
Recommended 90 to 110 psi for effective cleaning.
.
a)
SCFM (standard cubic feet/minute) referenced to 14.7 psia, +68 °F and 36% rel-
ative humidity (RH).
1)
Air pressure in vessel can affect purge operation.
purged process
connection with
factory-installed
1/8" NPT plug
angled holes
direct air flow