Yokogawa Multi Channel Oxygen Analyzer System ZR22/AV550G - Manual (Page 56)

IM 11M12D01-01E 3-6
3.2 Installation of the Detector (Model ZR22G-015)
3.2.1 Installation Location
This model detector is used with the High-temperature Probe Adapter (Model ZO21P-H)
when the temperature of sample gas exceeds 700
ЊC, or when it is required due to
maintenance spaces.
The following should be taken into consideration when installing the detector:
(1) Easy and safe access to the detector for checking and maintenance work.
(2) Ambient temperature of not more than 150
ЊC and the terminal box should not be
exposed to radiant heat.
(3) A clean environment without any corrosive gases.
(4) No vibration.
(5) The measured gas should satisfy the specifications described in Chapter 2.
3.2.2 Usage of the High-temperature Probe Adapter (Model ZO21P-H)
During analysis, the surface temperature of the probe adapter should be within the range
from the dew point of the measured gas and 300
ЊC to prevent ejector clogging, gasket
deterioration or bolt scoring.
Where the dew point of the measured gas is not known, keep within the range 200
ЊC to
300
ЊC.
The temperature shall be measured at the probe in the probe adapter and the surface of
the blind flange at the opposite side.
When the surface temperature is not within the above range, the following measures can
be taken to change the temperature.
ЊC>
(1) When the furnace pressure is negative, lower the pressure setting to reduce induction
flow of the measurement gas.
Refer to Section 2.6.3, Auxiliary Ejector for High Temperature, for the setting of
induction flow.
When you reduce induction flow, ensure that the ejector inducts air when the furnace
pressure fluctuates.
(2) When the furnace pressure is positive, close the needle valve for the sample gas
outlet to reduce the exhaust gas flow. Refer to Section 4.1.4, Piping to the High-
temperature Probe Adapter.
(3) When the probe adapter is surrounded by a heat insulator, remove the heat insulator.
Ensure that the temperature of the probe adapter does not fall below the dew point of
the gas in winter.
(4) To prevent temperature rises due to radiant heat, insert heat insulator between the
wall of the furnace and the probe adapter.
(5) To prevent temperature rises from thermal conduction, place the mounting flange as
far from the wall of the furnace as possible.