YOKOGAWA ZR22G User Manual page 81

EV1
ZERO GAS IN
*2: Needle valve is supplied as accessory with flowmeter
*1 Shielded cable
Use a shielded cable for the signal cable, and connect the shield to the FG terminal of the transmitter.
*2 Select the detector from the detector configuration table.
*3 For zirconia type oxygen densitometers, 100 vol%N
balanced) is used.
Figure 4.9
ZR22G Separate type
Zirconia Oxygen/Humidity Analyzer, Detector
Check valve
Figure 4.10
Blow Back Piping
n
This piping is required when the blow back function is carried out. The piping described below
provides automatic blow back operation when the " Blow back start " command is entered to the
converter.
REF
CHECK
OUT
OUT
Flowmeter
Flowmeter
*2 *2
EV2
AIR IN
Instrument air Approx.
1.5 l/min.
Piping inside in System 3
ZR802G Converter
Signal
(6-core shield cable)
Heater (2-core cable)
Needle
Flowmeter
valve
Reference gas
Calibration gas
ZR40H
Automatic Calibration Unit
Piping for System 3
Solenoid valve
EV1, EV2
F2-6-3E.ai
gas cannot be used as zero gas. Normally, approximately 1 vol%O
2
~
100 to 240 V AC
Contact input
Analog output, contact output
Digital output (HART)
Air Set
Instrument air
Pressure
reducing
valve
Zero gas cylinder
Calibration gas
unit case
<4. Piping>
IM 11M12G01-02EN 1sh Edition : Mar. 25, 2021-00
4-8
(N
2 2