Piping For The Reference Gas; Piping To The High Temperature Probe Adapter; Piping For System 3 - YOKOGAWA ZR22G User Manual

Mount a check valve or stop valve (specified by YOKOGAWA) on the nipple (found on the local
market) at the calibration gas inlet of the detector as illustrated in Figure 4.8.
(The check valve or the stop valve may have been mounted on the detector when shipped.)
Connect the flow setting unit and the detector to a stainless steel pipe 6 mm (O.D.) x 4 mm or
larger (I.D.) (or nominal size 1/4 inch).
Figure 4.8
4.2.3

Piping for the Reference Gas

Reference gas piping is required between the air source (instrument air) and the flow setting unit,
and between the flow setting unit and the detector.
Insert the air set next to the flow setting unit in the piping between the air source and the flow
setting unit.
Use a 6 mm (O.D.) x 4 mm or larger (I.D.) (or nominal size 1/4 inch) stainless steel pipe between
the flow setting unit and the detector.
4.2.4

Piping to the High Temperature Probe Adapter

Refer to Section "4.1.4 Piping to the High Temperature Probe Adapter".
4.3

Piping for System 3

Piping in System 3 is illustrated in Figure 4.9. In System 3, calibration is automated;
however, the piping is basically the same as that of System 2. Refer to Section "4.2
for System 2".
Adjust secondary pressure of both the air set and the zero gas reducing valve so that these
two pressures are approximately the same. The flow rate of zero and span gases (normally
instrument air) are set by a single needle valve.
After installation and wiring, check the calibration contact output (see Sec. "7.11.2
Checking Calibration Contact Output"), and adjust zero gas reducing valve and calibration gas
needle valve so that zero gas flow is within the permitted range. Next check span gas calibration
contact output and adjust air set so that span gas flow is within the permitted range.
When blow back function is used by contact input to the ZR802G converter, install blow back
piping as illustrated in "n Blow Back Piping".
Note: Blow back function means the function to get rid of dust inside a probe in a high temperature probe adapter by using compressed
air, when a high temperature detector is used.
It is recommended to use ZH21B dust protector to protect the probe output from dust
agitation (i.e., to prevent combustible materials from entering the probe cell) where humidity
measurements are made under dusty or combustible environment.
Stop valve or Check valve
Piping for the calibration gas, 6 mm (O.D.)
by 4 mm (I.D.) Stainless steel pipe
Piping for the reference gas, 6 mm (O.D.)
by 4 mm (I.D.)Stainless steel pipe
Piping for the Calibration Gas Inlet
<4. Piping>
F4-8E.ai
IM 11M12G01-02EN
4-7
Piping
1sh Edition : Mar. 25, 2021-00