YOKOGAWA ZR202S, User Manual, Page: 52 / 163

<4. Piping>
4-4
IM 11M13A01-04E 3rd Edition : Dec.15,2014-00
4.2 Piping for System 2
Piping in System 2 is illustrated in Figure 4.3. In System 2, calibration is automated; however, the
piping is basically the same as that of System 1. Refer to Section 4.1.
Adjust secondary pressure of both the air set and the zero gas pressure reducing valve so that these
two pressures are approximately the same. The flow rate of zero and span gases (normally instrument
air) are set by a individual needle valve. After installation and wiring, check the calibration contact
output (see Sec. 7.9.2), and adjust zero gas pressure reducing valve and calibration gas needle valve
so that zero gas flow is within the permitted range. Next check span gas calibration contact output and
adjust air set so that span gas flow is within the permitted range.
~ 100 to 240 V AC
Automatic
Calibration Unit
Reference gas
Calibration gas (Zero)
Contact input
Analog output, contact output
Digital output (HART)
Air Set
Instrument air
Calibration gas
unit case
Pressure
reducing
valve
Zero gas cylinder
ZR202S Integrated type Explosion-proof
Zirconia Oxygen Analyzer
F4-3E.ai
Span gas
*2
Non-hazardous Area
Hazardous Area
*1
Note:
The installation temperature limits range for integrated type analyzer is -20 to 55 °C.
Figure 4.3 Piping for System 2