Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 16)

IM 11M12A01-05E 1-2
1.1 < EXAxt ZR > System Configuration
The system configuration determines whether calibration is initiated automatically or
manually.
The three basic system configurations are given below:
1.1.1 System 1
This is the simplest system which consists of an integrated-type (all-in-one) detector and
analyzer. This system can be used for monitoring humidity in driers used in food
processing, or the like. No piping is required for the reference gas (air) which is fed in at
the installation site. The handheld ZO21S standard gas unit is used for calibration. Zero
and span gases from the standard gas unit are only fed to the detector through a tube
during calibration.
CAUTION
• As this system uses ambient air for the reference gas, measuring accuracy will be
affected by the installation location.
• A stop valve should be connected to the calibration gas inlet of the equipment. The
valve should be fully closed unless calibration is being performed.
~
Model ZR202G Integrated type Zirconia
High Temperature Humidity Analyzer
Model ZO21S Standard gas unit
Stop valve
Calibration gas
F1.1E.EPS
~
100 to 240 V AC
100/110/115
200/220/240 V AC
Contact input
Analog output, Contact output
Digital output (HART)
Figure 1.1
1.1.2 System 2
This system is used where the installation atmosphere is polluted by gases other than air,
or where accurate monitoring and controlling of the humidity is required. Instrument air
(clean and dry air of oxygen concentration 21%) is used as the reference gas and the
span gas for calibration. Zero calibration gas is supplied from the cylinder. The gas flow
is controlled by the ZA8F flow setting unit (for manual valve operation).
~
Model ZR202G Integrated type Zirconia
High Temperature Humidity Analyzer
F1.2E.EPS
Model ZA8F flow setting unit
Reference
gas
Calibration gas
Needle
valve
Flowmeter
Instrument air
Air Set
Calibration gas pressure
regulator Zero gas
cylinder Calibration gas unit case
Check valve
or
Stop valve
Span gas (Same as Zero gas
calibration unit)
100 to 240 V AC
Contact input
Analog output, Contact output
Digital output (HART)
Figure 1.2