Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 51)

<3. Installation>
3-5
IM 11M12A01-02E 8th Edition : Jan.13,2012-00
3.2 Installation of High Temperature Detector
(ZR22G-015)
3.2.1 Installation Location
This detector is used with the High Temperature Probe Adapter (Model ZO21P-H) when the
temperature of sample gas exceeds 700 °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 150 °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 sample gas should satisfy the specifications described in Chapter 2.
3.2.2 Usage of the High Temperature Probe Adapter
(ZO21P-H)
During analysis, the surface temperature of the probe adapter should be within the range from
more than the dew point of the sample gas and 300 °C or less to prevent ejector clogging, gasket
deterioration or bolt scoring.
Where the dew point of the sample gas is not known, keep within the range of more than 200 °C
to less than 300 °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.
<When the surface temperature exceeds 300 °C>
(1) When the furnace pressure is negative, lower the pressure setting to reduce induction flow of
the sample gas.
Refer to Section 2.7.3, Ejector Assembly 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.