Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 69)

IM 11M12A01-03E 4-2
• 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, such as paper dust,
environment.
4.1.1 Parts Required for Piping in System 1
Check that the parts listed in Table 4.1 are ready.
Table 4.1
Detector Piping location Parts Note
General-use Calibration gas inlet Stop valve Recommended by YOKOGAWA
detector (L9852CB or G7016XH)
nipple * Rc1/4 or 1/4 NPT generic parts
joint for tube connection Rc1/4 (1/4NPT) for ␾6ϫ␾4mm generic parts
soft tube
Reference gas inlet (sealed up) (when piping is required, refer to section 4.1.3)
Note : Parts with marking * are used when required. T4.1E.EPS
4.1.2 Connection to the Calibration Gas Inlet
When carrying out calibration, connect the piping (6(O.D)
ϫ4(I.D.) mm tube) from the
standard gas unit to the calibration gas inlet of the detector. First, mount a stop valve (of
a quality specified by YOKOGAWA) or a nipple (found on the open market) as illus-
trated in Figure 4.2, and mount a joint (also found on the open market) at the stop valve
tip. (The stop valve may be mounted on the detector prior to shipping the detector is
shipped.)
Note : Mount the stop valve close to the detector.
F4.2E.EPS
Nipple Stop valve
Tube connection
joint
Figure 4.2 Connection to the calibration gas inlet
4.1.3 Connection to the Reference Gas Inlet
• Normally, no piping is required for the reference gas inlet when the equipment uses
natural convection for reference gas (models ZR22G-
ᮀ-ᮀ-ᮀ-C). Leave the plug as it
is. If the air around the detector is polluted and the necessary oxygen concentration
(21 vol%O
2
) cannot be obtained, prepare piping the same as which described in
Section 4.2, System 2.
• When the equipment uses instrument air for the reference gas, piping is required as
described in Section 4.2, System 2 (models ZR22G-
ᮀ-ᮀ-ᮀ-E).