Teledyne 3300PB - Low cost percent oxygen analyzer - Manual (Page 22)

3 Installation Model 3300 PB
3-6
Teledyne Analytical Instruments
A switching valve is provided to feed the analysis unit with either
sample or gas.
A flowmwter and flow controller valve are part of the system and will
assist in setting the flow of the gas.
Sample flow should be adjusted to 2 SCFH. The sample vent connec-
tion should not restrict the sample flow. The sensor is designed to operate at
atmospheric pressure. Restricting the sample vent line will result in pressur-
izing the sensor and altering the O
2
reading.
The pressure required will depend on the sampling system. When
venting into a constant pressure, such as the atmosphere, controlling input
pressure is simple. If you are venting into a system of varying pressure, then
some form of pressure regulation is required to maintain a constant pressure.
Sampel and Span pressure is not to exceed 50 psig (345 Kpa).
Figure 3-3: Piping Diagram
(standard piping diagfram for positive pressure service)