Teledyne TurbO2 - Portable trace oxygen analyzer - Manual (Page 9)

5
Portable Trace Oxygen Analyzer TURBO
2
Teledyne Analytical Instruments
Supporting Equipment and Services
Sampling Equipment
The customer must provide a means of controlling the pressure and
flowrate of the sample gas. For positive pressure applications, TAI suggests
a simple throttle valve installed in the sample line between the sample point
and the analyzer. The flowrate should be limited to between 0.1 and 10
liters/min.
IMPORTANT: Use pressure regulators with a metallic diaphragm ONLY.
Regulators with organic or plastic diaphragms are permeable to oxygen
and, if used in the sampling system, will lead to high oxygen readings.
For atmospheric pressure sampling, the TURBO
2
P has a pump and
flow control valve downstream of the analyzer to draw (rather than push) the
sample through the instrument.
TAI supplies three (3) male disconnect fittings with the instrument: one
for installation of the customer’s sample line, one to be used to open the vent
fitting of the instrument, and one (equipped with a plastic tube) for drawing
air through the unit for calibration purposes.
Do not place any restriction on the line between the sample point
and the analyzer—as a partial vacuum would then be drawn on the cell.
Since the cell is a partial pressure sensitive device, any oxygen readings
taken under these conditions would be erroneous. In addition, vacuums in
excess of one-third of an atmosphere may damage the cell.