Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 17)

IM 11M12A01-03E 1-4
1.1.3 System 3
This system is for accurate monitoring and controlling of humidity. Instrument air
(clean and dry air) is used for the reference gas and the span gas for calibration. Zero
gas is fed in from a cylinder during calibration. The calibration gas flow is controlled
automatically by the ZR40H automatic calibration unit.
This system is similar to system 2, except that the calibration gas flow is automated
using the ZR40H automatic calibration unit.
F1.3E.EPS
Separate type Zirconia
High Temperature Humidity Analyzer,
Model ZR22G Detector
Model ZR402G Converter
Signal
(6-core shield cable)
Heater (2-core shield cable)
Reference gas
Calibration gas
FlowmeterNeedle
vaive
Calibration gas
unit case
Zero gas cylinder
100 to 240 V AC
*3
Check valve
Model ZR40H Auto-Calibration unit
Contact input
Analog output, contact output
Digital output (HART)
Air Set
lnstrument air
Calibration gas pressure regulator
EXA ZR402G
ϳ
*1
*2
Figure1.3
*1 Shield cable : Use shielded signal cables, and connect the shield to the FG terminal
of the converter.
*2 Select the desired probe from the Probe Configuration table on page 1-5
*3 100% N
2
gas cannot be used as the zero gas. Use approximately 1% of O
2
gas (N 2 -
based).