Panametrics CGA 351, User Manual, Page: 21 / 119

CGA 351 User’s Manual 15
Chapter 3.
Chapter 3.
3.1 Operation
3.1.1 Introduction
The CGA 351 is an easily-operated monitoring device. Before applying power, make sure the system has been
installed in accordance with the instructions given in Chapter 2, Installation.
Note: For information regarding component locations and/or wiring connections in an optional enclosure, see
Appendix C.
Allow the unit to warm up for at least thirty minutes prior to use. Check to see if it is hot. Observe all normal safety
precautions. Specifically, do not exceed the maximum pressure and temperature ratings of the zirconium oxide
oxygen sensor and the sample system.
This chapter includes discussions of the following topics:
•
preventing common problems
• powering up the system
• configuring the digital display
• taking measurements
WARNING!
To ensure safe operation of the CGA 351, it must be installed and operated as described in this
manual. In addition, be sure to follow all applicable local safety codes and regulations for installing
electrical equipment.
3.1.2 Preventing Common Problems
Use the CGA 351 to accurately measure low oxygen levels. To avoid problems, observe the following:
•
Check the calibration of the analyzer once or twice a week for the first month of operation and once every 2–3
months thereafter (see Calibrating the CGA 351 on page 62).
• Never use thread sealant on any connection in the sample gas flow path. Thread sealant gives off combustible
vapors that can cause reading errors.
• Do not handle the oxygen sensor with bare hands. Although some scratches on the platinum coating can be
tolerated, rubbing the coating should be avoided.
• Clean the oxygen sensor only by rinsing it with clean water, after the sensor has cooled. Scrubbing the oxygen
sensor or washing a hot sensor in cold water can damage or destroy it.
• Do not disturb the special sealant on the oxygen sensor nut and the inlet fittings. Any leakage in these areas will
cause inaccurate readings when measuring low oxygen levels.
3.1.3 Powering Up the System
Before applying power, check the wiring connections and close both enclosures. Energize the external disconnect
device to power up the CGA 351. (See page 24 for powering down instructions). For reliable readings, allow
approximately two hours for the analyzer to reach temperature equilibrium before taking measurements.
WARNING!
To prevent corrosion, the analyzer must be powered
up immediately after introduction of the sample gas.
If the analyzer is left installed without power, the unit’s components become susceptible to acid
condensation
that will cause corrosion.
If the power must be removed for more than thirty minutes, purge the analyzer through the inlet port
with a continuous flow of instrument air at a rate of
400 ± 40 cc/min.