Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 User Manual
the induction flow is reduced, ensure that the eductor inducts air when the process
When the process pressure is positive, close the needle valve for the sample gas outlet
to reduce exhaust gas flow. Refer to section 5.1 for piping instructions.
When the probe adapter is surrounded by a heat insulator, remove the insulation. Ensure
that the temperature of the probe adapter does not fall below the dew point of the gas in
To prevent temperature rises due to radiant heat, insert a heat insulator between the
process wall and the probe adapter.
To prevent temperature rises from thermal conduction, place the mounting flange as far
from the process wall as possible (4” min).
(2) When the surface temperature is less than 200ºC (392ºF):
When the process pressure is negative, raise the eductor air pressure to increase
induction flow of the measurement gas. Refer to section 6.1 of this manual for setting of
induction flow. Excessive dust may accumulate, and the eductor may clog if induction
When the process pressure is positive, open the needle valve for the sample gas outlet
to increase the gas flow.
Warm the probe adapter. Refer to Appendix A for instructions relating to the /HT Heated
Air Eductor Option. Ensure that the temperature does not drop below freezing point.
When the surface is still less than 200ºC (392ºF) or below the dew point of the measured
gas regardless if the above measure have been taken, warm the adapter with an
external; heat source such as steam.