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Instruction Manual
IM-106-5500, Original Issue
August 2005
2-7
CCO 5500
Figure 2-3. Analyzer Head
Arrangement
AIR SUPPLY The purpose of the air purge is to keep the windows of the transmitter and the
receiver clean. Air may be supplied by one of three methods:
1. Negative pressure duct.
If the duct across which the instrument is measuring operates at a
negative pressure under all firing conditions, the air purge inlets may be
simply left open and the negative draft in the duct allowed to draw in
ambient air.
NOTE
For positive pressure ducts, they must be supplied with either compressed air,
or air from a blower.
2. Compressed air.
Using a fine flow regulator and filter, compressed air may be used to
provide the low flow required - an air supply of 14.7 psi (1 bar) is
required and the consumption is 2.2 cfm (1 liter/second) per purge.
3. Blower air.
A blower may be used to provide the air to the air purge - customers
may specify their own blower - it should be able to deliver 11 cfm (5
liters/second) per purge against the working pressure of the duct -
Rosemount Analytical can specify a blower if required.
Hexagon
Head Screws
Flexible Gasket
Air Purge
Transmitter or
Receiver