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<3. PIPING>
3-2
IM 11M03A02-00E
CAUTION
• The stop valve should be connected directly to the detector. If any piping is present between
the detector and the stop valve, water may condense in the pipe, which may cause damage
to the sensor by rapid cooling when the calibration gas is introduced. The stop valve should
be closed except while the calibration gas is being introduced.
• The reference gas should have an oxygen concentration identical to that of fresh air (21%).
3.1.1 Parts Required for Piping in System 1
Check that the parts listed in Table 3.1 are ready.
Table 3.1 Parts required for piping
Piping section Parts required Description
At the calibration
gas inlet
Stop valve Recommended by YOKOGAWA (L9852CB or G7016XH)
* Nipple R1/4 or 1/4 NPT On the open market
Tube connecting joint R1/4 or 1/4 NPT – ø6 × ø4 mm soft tube On the open market
At the reference
gas inlet
Air set Recommended by YOKOGAWA (K9473XH/K9473XJ)
Piping joint R1/4 or 1/4 NPT On the open market
Note: The parts with an asterisk (*) may not be required.
3.1.2 Connection to the Calibration Gas Inlet
When carrying out calibration, connect the piping (ø6 × ø4 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) on a nipple (found on the open market) as illustrated in Figure 3.2, 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.)
Note 1: Mount the stop valve close to the detector.
F4.2E.EPS
Nipple Stop valve
Tube connection
joint
Figure 3.2 Connection to the calibration gas inlet