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 zirconia 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
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.
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 Model CGA 351 on page 4-31).
• Never use thread sealant on any connection in the sample gas flow
path. Thread sealant gives off combustible vapors that can cause
• 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.