Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 15)

IM 11M12A01-03E 1-2
1.1 < EXAxt ZR > System Configuration
The system configuration should be determined by the conditions; e.g. whether the
calibration gas flow should be automated. The system configuration can be classified
into three basic patterns as follows:
1.1.1 System 1
This is the simplest system consisting of a detector and a converter. This system can be
implemented for monitoring humidity in a production process such as food production.
No piping is required for the reference gas (air) which is fed in at the installation site.
The handy ZO21S standard gas unit is used for calibration.
Zero gas from this unit and span gas (air) is sent to the detector through a tube which is
connected during calibration.
CAUTION
• A needle (stop) valve should be connected to the calibration gas inlet of the detector.
The valve should be fully closed unless calibration is in progress.
• As this system uses ambient air for the reference gas, measuring accuracy will be
affected by the installation location.
EXA ZR402G
Separate type Zirconia
High Temperature Humidity Analyzer,
Model ZR22G Detector
Model ZR402G Converter
Stop valve
Calibration gas
Model ZO21S Standard gas unit
ϳ
ϳ 100 to 240 V AC
F1.1E.EPS
Contact input
Analog outout, contact output
Digital output (HART)
Signal
(6-core shield cable)
Heater (2-core)
Figure 1.1