Teledyne 7320 - NDIR analyzer - Manual (Page 17)

Infrared Gas Analyzer Installation 2
2-3 Teledyne Analytical Instruments
2.2.3 Calibration Gases
The system may require a supply of clean, oil and particulate free air for use
as zero gas.
For accurate calibration, the analyzer requires a blended gas mixture,
typically 80-90% of the full scale range. For examle: a 0-1% CO analyzer,
should use a 0.8 to 0.9% CO in N
2
bottled mixture. The gas blend should be a
working certified standard, analyzed by the gas supplier to at least 2% accuracy.
Do not restrict the bypass, sample or reference vents of the analyzer (and
sample system when provided). All lines must vent to a stable safe area-typically
1 ATM A +/- 0.005 pressure (0 psig +/- 0.07). Be sure to vent the analyzer exit
to atmospheric unless otherwise indicated by the system piping schematic. Refer
to the systsem outline, piping schematics for proper connections and flow paths
of the analysis system.
2.2.4 Pipe Connections
Refer to Appendix Piping Drawings for information about pipe connec-
tions. On special systems, consult the text in the manual that describes your
particular sample system in detail.
2.2.5 Sample Delivery System
The sample delivery system should be designed to operate reliably and
must be of large enough capacity to avoid flow stops. A pump is required only
if there is insufficient pressure to reliably supply the sample to the system
equipment panel. Do not complicate the delivery system by adding a pump
unless it is absolutely necessary. If a pump is required, select a type that can
handle the sample (corrosion), as well as meet the area classification and
Environmental conditions.
2.2.6 Venting the System
In gas analysis systems, the system vent manifold or bypass/sample vents
must terminate in a safe area as the sample may be poisonous, corrosive or
flammable.
2.3 Electrical Connections
Figure 2-2 shows the Model 7320 interface panel. There are connectors
for power, digital communications, and both digital and analog concentration
output.
For safe connections, no uninsulated wiring should be able to come in
contact with fingers, tools or clothing during normal operation.