Instruction manual
3.0 INSTALLATION SM425 INSTRUCTION MANUAL
42500001 REV A 47
The temperature is measured by the probe inside of the probe adapter and at the surface of the blind
flange on the side opposite the mounting flange.
If the surface temperature is not within the above range, use the following procedures:
<If the surface temperature exceeds 300°C>
1. If the furnace pressure is negative, lower the pressure setting to reduce induction flow of the
process gas.
Refer to Section 1.9.3, Auxiliary Ejector for High Temperature, for the setting of induction flow.
If you reduce induction flow, ensure the ejector inducts air when the furnace pressure fluctuates.
2. If the furnace pressure is positive, close the needle valve for the sample gas outlet to reduce the
exhaust gas flow. Refer to Section 1.18.4, Piping to the High-temperature Probe Adapter.
3. If the probe adapter is surrounded by a heat insulator, remove the heat insulator.
Ensure the temperature of the probe adapter does not fall below the dew point of the gas in
winter.
4. To prevent temperature rise due to radiant heat, insert heat insulator between the wall of the
furnace and the probe adapter.
5. To prevent temperature rise from thermal conduction, place the mounting flange as far as
possible from the wall of the furnace.
<If the surface temperature is less than 200°C or the dew point of the measurement gas>
1. If the furnace pressure is negative, raise the analyzer pressure to increase induction flow of the
process gas.
Refer to Section 1.9.3, Auxiliary Ejector for High-temperature Use, for the setting of induction
flow.
If there is particulate in the gas, the ejector may become clogged as induction flow increases.
Particulate filtering may be required.
2. When the furnace pressure is positive, open the needle valve for the sample gas outlet to
increase the gas flow.
Refer to Section 1.18.4, Piping to the High-temperature Probe Adapter.
3. Warm the probe adapter. Refer to Section 1.19.4, Piping to the High-temperature Probe Adapter.
Ensure its temperature does not drop below freezing point in winter.
4. If the surface temperature is still less than 200°C or the dew point of the process gas, even if the
previous measures have been taken, warm the probe adapter using a heat source such as
steam.