Piping For The Detector With Pressure Compensation - YOKOGAWA ZR22G User Manual

4.4 Piping for the Detector with Pressure
Compensation
The ZR22G----P Detector with Pressure Compensation may be used in System 2 and
System 3. However, it cannot use piping for high temperature probe adapter or blow back piping.
Use this detector whenever the furnace pressure exceeds 5 kPa (see Note). Even if the furnace
pressure is high, the detector can measure by adjusting pressure of the detector to the furnace
pressure using instrument air. The inside pressure of the probe will be kept the same as the
furnace pressure by feeding instrument air at higher pressure than that in the furnace.
NOTE
Sample gas pressure should not vary rapidly and widely.
*1
Reference gas outlet
*1 Dimensions may vary depending on the detector type. Refer to Section 2.2
Ensure that the flange gasket does not block the reference gas outlet.
Where necessary, make a notch on the flange
Figure 4.13
Valve operation
(1) For safety, stop the furnace that the detector is to be installed in. If furnace internal pressure
is high, this is especially dangerous.
(2) Before starting instrument air flow, completely shut the stop valve in front of the reference
gas outlet.
(3) Check that the reference gas outlet is not blocked by a flange gasket or the like.
(4) Set the instrument air pressure higher than furnace internal pressure.
(5) Completely open the stop valve in front of the reference gas outlet and, after turning on instrument air
flow, start furnace operation. As furnace internal pressure rises, confirm that instrument air continues
to flow and adjust the valve or increase supply pressure if necessary.
(6) After furnace internal pressure stabilizes, adjust flow.
(7) If furnace operation is stopped, stop instrument air flow and completely shut the stop valve
in front of the reference gas outlet. You may leave reference gas flowing if you wish.
CAUTION
• As far as possible do not stop the instrument air flow, to prevent the sample gas from
entering the detector and damaging the zirconia cell.
• Connect the stop valve, which is at the calibration gas inlet, directly to the detector.
If there is piping between the detector and the valve, condensation may damage the
detector by rapid cooling when calibration gas is introduced.
156
PIPING
Flange
*1
PIPING
Detector with Pressure Compensation
Rc1/4 or 1/4NPT
Reference gas inlet
87
2-G1/2, 2-1/2NPT etc.
Cable connection port
*1
*1
Rc1/4 or 1/4NPT
Calibration gas inlet
Stop Valve
IM 11M12G01-02EN
4-10
<4. Piping>
*1
Flange
F4-12E.ai
1sh Edition : Mar. 25, 2021-00