Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 59)

IM 11M13A01-02E 3-8
3.2 Installation of the Detector (Model ZR22S-
ᮀ-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
Њ C, 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 60
Њ C 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.
CAUTION
Be sure to read Section 3.1.2 to 3.1.5 where the important information on writing is
provided.
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
Њ C 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
Њ C to
300
Њ C.
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.
CAUTION
When the surface temperature of ZR22S or ZO21P-H exceeds temperature class
T2(300
؇C), this system shall not satisfy explosionproof requirement for outside of the
furnace.
<When the surface temperature exceeds 300
ЊC>
(1) When the furnace pressure is negative, lower the pressure setting to reduce induction
flow of the measurement gas.
Refer to Section 2.7.1, Auxiliary Ejector for High Temperature, for the setting of
induction flow.
When you reduce induction flow, ensure that the ejector induct does not air if 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 4.1.5, 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.