Piping; Piping For System 1 - YOKOGAWA ZR402G User Manual

4.

Piping

This chapter describes piping procedures in the three typical system configurations for EXAxt ZR
Integrated type Zirconia Oxygen/Humidity Analyzer.
• Ensure that each check valve, stop valve and joints used for piping are not leaking.
Especially, when there is any leakage at piping and joints for the calibration gas, it may
cause clogging of the piping or incorrect calibration.
• Be sure to conduct leakage test after setting the piping.
• Basically, apply instrument air (dehumidified to the dew point -20°C or lower, removed any
dust, oil mist and the like) for the reference gas when piping.
• When the instrument applies natural convection for reference gas (Model ZR202G---
--C), ambient air near the probe is used for reference gas; therefore the accuracy of
analysis will be affected by ambient humidity changes or the like. If more accurate analysis
is necessary, use instrument air (dehumidified to the dew point -20°C or lower, removed any
dust, oil mist and the like) for reference gas.
Stable analyzing can be conducted when using instrument air.
4.1

Piping for System 1

The piping in System 1 is illustrated in Figure 4.1
Stop valve
Figure 4.1
Piping in System 1 is as follows:
• Place a stop valve through the nipple at the calibration gas inlet of the equipment.
Then mount a joint for a 6 mm (O.D.) x 4 mm (I.D.) soft tube at the stop valve connection
hole of the inlet side (see Section 4.1.2). The tube is to be connected to this joint only during
calibration.
CAUTION
• The stop valve should be connected directly to the equipment. If any piping is present
between the analyzer and the stop valve, condensed water may be produced in the pipe,
which may cause damage to the sensor by rapid cooling when the calibration gas is
introduced.
• The reference gas should have an oxygen concentration identical to that of fresh air (21%).
ZR202G Integrated type
Zirconia Oxygen/Humidity Analyzer
~
100 to 240 V AC
Contact input
Analog output, contact output
Digital output (HART)
Calibration gas
ZO21S Standard gas unit
Piping for System 1
<4. Piping>
100/110/115/200/220/240 V AC
~
F1.1E.ai
IM 11M12A01-04E
4-1
11th Edition : Jul. 19, 2017-00