Piping For The Oxygen Analyzer With Pressure Compensation - YOKOGAWA ZR402G User Manual

4.4 Piping for the Oxygen Analyzer with
Pressure Compensation
ZR202G-----P Oxygen Analyzer with pressure compensation may be used in System 2
and System 3.
Use this style analyzer 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 probe with the
furnace pressure using instrument air. The inside pressure of the probe will be kept identical to
the furnace pressure by feeding instrument air at higher pressure than that in the furnace.
NOTE
The process gas pressure should not be subjected to rapid changes.
The detector with pressure compensation is illustrated in Figure 4.6.
*1
Reference gas outlet
*1: Dimension may vary depending on the detector type.
Ensure that the flange gasket does not block off the reference gas outlet.
Where necessary, make a notch on the flange
Figure 4.6
Ensure that the furnace gas does not flow into the probe.
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.
342±4
Rc 1/4 or 1/4 NPT
(Reference gas inlet)
PIPING
*1
PIPING
Stop valve
Oxygen Analyzer with Pressure Compensation
<4. Piping>
*1
*1
4-G1/2, 2-1/2 NPT or the like
(Wiring connection)
49
Rc1/4 or 1/4NPT
(Calibration gas inlet)
IM 11M12A01-04E
4-6
Unit: mm
*1
C
Flange
F4.12E.ai
11th Edition : Jul. 19, 2017-00