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<4. Piping>
4-10
IM 11M12A01-02E 16th Edition : Mar. 19, 2020-00
*1
*1
*1
*1
Flange
156
87
Rc1/4 or 1/4NPT
Calibration gas inlet
25
48
Reference gas outlet
Flange
PIPING
PIPING
Stop Valve
Rc1/4 or 1/4NPT
Reference gas inlet
2-G1/2, 2-1/2NPT etc.
Cable connection port
*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
F4-12E.ai
*1
Figure 4.13
Detector with Pressure Compensation
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 sensor
by rapid cooling when calibration gas is introduced.
Figure 4.14 illustrates an example of System 2 using a detector with pressure compensation.
Supply air pressure (flow) may vary depending on the furnace pressure. It is recommended to
use a flowmeter and an air set that is suitable for the furnace pressure.
NOTE
When using the ZA8F Flow Setting Unit and ZR40H Automatic Calibration Unit, please note that
the supplying airflow (pressure) will vary depending on the furnace pressure.
Содержание EXAxt ZR22G
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