YOKOGAWA av550g, User Manual

Page: 51 / 213

< 3. Installation >
3-6
IM 11M12D01-01E
(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.
<When the surface temperature is less than 200 °C or below the dew point of the sample gas>
(1) When the furnace pressure is negative, raise the pressure setting to increase induction flow
of the sample gas. Refer to Subsection 2.6.3, Ejector Assembly for High Temperature, for the
setting of induction flow. If there is much dust in the gas, the ejector may become clogged as
induction flow increases.
(2) When the furnace pressure is positive, open the needle valve of the sample gas outlet to
increase the gas flow. Refer to Subsection 4.1.4, Piping to the High Temperature Probe Adapter.
(3) Warm the probe adapter. Refer to Subsection 4.1.4, Piping to the High Temperature Probe
Adapter.
(4) When the surface temperature is still less than 200 °C or below the dew point of the sample gas,
even if the above measures have been taken, warm the probe adapter using a heat source such
as steam.
3.2.3 Probe Insertion Hole
A high temperature detector consists of a ZR22G-015 Detector and ZO21P High Temperature Probe
Adapter. When forming the probe insertion hole, the following should be taken into consideration:
(1) If the probe of the ZO21P is made of silicon carbide (SiC), the probe hole should be formed so
that the probe is mounted vertically (within ± 5° tilt).
(2) In the case where the probe of the ZO21P is made of stainless steel and the high temperature
probe adapter (ZO21P-H-B) is to be mounted horizontally, the probe hole should be formed so
that the probe tip is not higher than the probe base.
100mm
JIS 5K 50 FF (equivalent)
or ANSI Class 150 4 RF
(equivalent) flange
100mm
A space of 52 mm or more
in diameter, and long enough
for the length of the probe
The allowable margin for probe
tilt is within ± 5°.
An SiC probe shall be mounted vertically.
A space of 52 mm or
more in diameter, and
long enough for the length
of the probe
Never mount the probe
with its tip higher than
the base
Horizontal mounting is used with a SUS probe.
JIS 5K 50 FF (equivalent) or
ANSI Class 150 4 RF
(equivalent) flange
F3-6E.ai
Figure 3.5 Examples of the probe insertion hole
3.2.4 Mounting of the High Temperature Detector
CAUTION
• Ceramic (zirconia) is used in the sensor (cell) portion on the detector probe tip. Care should be
taken not to drop the detector during installation.