Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 57)

IM 11M12A01-05E 4-1
4. Piping
4. Piping
This chapter describes piping procedures in the three typical system configurations for
EXAxt ZR
Integrated-type Zirconia High Temperature Humidity Analyzer.
• Ensure that each check valve, stop valve and joints used for piping are not leaking.
Especially, if there is any leakage of the calibretion gas from piping and joints, it may
cause clogging of the piping or incorrect calibration.
• Be sure to conduct leakage test after installing the piping.
• Basically, apply instrument air (dehumidified by cooling to the dew point -208 C or
lower, and removing any dust, oil mist and the like) for the reference gas when
piping.
• When the instrument uses natural convection for reference gas (Model ZR202G-h-h-
h -C), ambient air near the probe is used for reference gas ; therefore the accuracy of
analysis will be affected by ambient temperature changes or the like. If more accurate
analysis is necessary, use instrument air (dehumidified by cooling to the dew point
-208 C or lower, and removing any dust, oil mist and the like) for reference gas.
Stable analyzing can be conducted when using instrument air.
4.1 Piping for System Configuration 1
The piping in System 1 is illustrated in Figure 4.1.
~
Model ZO21S Standard gas unit
Stop valve
Calibration gas
F4.1E.EPS
~
100 to 240 V AC
100/110/115
200/220/240 V AC
Model ZR202G Integrated type Zirconia
High Temperature Humidity Analyzer
Contact input
Analog output, Contact output
Digital output (HART)
Figure 4.1 Piping in System 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, water may condense 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%).