YOKOGAWA EXAxt ZR22G, User Manual, Page: 88 / 211

<5. Wiring>
5-11
IM 11M12A01-02E 16th Edition : Mar. 19, 2020-00
5.2.9 Wiring for ZR40H Automatic Calibration Unit
This wiring is for operating the solenoid valve for the zero gas and the span gas in the ZR40H
Automatic Calibration Unit, in a system where the calibration gas flow rate is automatically
controlled (e.g. System configuration 3). When installing this wiring, proceed as follows:
COMMON SPAN ZERO
to ZR402G terminal "AC-COM"
to ZR402G terminal "AC-SPAN"
to ZR402G terminal "AC-ZERO"
Wiring inlet
2-G1/2, Pg13.5, M20 or 1/2NPT
ZERO
SPAN
COMMON
Span gas solenoid valve
Zero gas solenoid valve
Terminal screw : M4
F5-12E.ai
Figure 5.11 Automatic Calibration Unit
Cable Specifications
Use a 3-core cable for the above wiring.
Wiring Procedure
M4 screws are used for the terminals of the converter. Each cable should be terminated
corresponding to crimp-on terminals. M4 screws are used for the terminals of the solenoid valve
as well.
ZR402G
Converter
ZR40H Automatic
Calibration Unit
AC-Z
AC-C
AC-S
Zero
Span
F5-13.ai
Figure 5.12 Wiring for Automatic Calibration Unit