YOKOGAWA PH450G

<3. Piping and Wiring>
3-6
IM 12B07W01-04EN 1st Edition : Nov 11, 2016-00
(6) Connection for contact input of WASH (cleaning) signal
It is already been wired.
3.2.2 Wiring system with 2-Wire Analyzer
Figure 3.3 illustrates wiring the system with 2-Wire Analyzer.
pH sensor
Wiring by customer
100V AC
100V AC
PH8SM3
Control box
Cleaning Signal
Air Cylinder
Cylinder failure signal
pH
Holder
8
9
13
12
11
14
15
16
A(+)
B(
-)
e
f
(+)C
(
-)D
+
-
4
5
6
7
1
2
3
1
2
Position signal
Output signal
(1-5V DC)
FLXA202 or FLXA21
PH201G
Distributor
Figure 3.3 wiring for 2-Wire Analyzer (PH8SM3-G, -F)
(1) Connection for pH sensor cable
Connect the sensor cable so that the code on each core wire matches the corresponding
code on 2-Wire Analyzer; FLXA202 or FLXA21. For more information about sensor cable
connection, see the user’s manual on “FLXA 202/FLXA21 ” Also refer to “WTB10 Relay
Terminal Box” user’s manual if your system uses a relay terminal box.
CAUTION
The sensor cable and the KCI supply tube move up and down in synchronization with the sensor
holder along the PH8HS3 holder. Give adequate consideration to any slack in the cable or tube
and to the installation location to ensure that a smooth up-and-down motion takes place. The
cable or tube may be damaged if, during the up-and-down motion, it comes into accidental
contact with the PH8HS3 holder or other structures.
(2) Connection for DETECT UPPER LIMIT signal
Use a two-core cable with an outer diameter of 9 to 12 mm for this connection. Treat both
ends of each core wire of the cable so they t M4 threads and then connect terminal 1 of the
terminal block for the limit switch of the PH8HS3 holder with terminal 8 of the control box,
terminal 2 with terminal 9.
Note: There will not be a problem if you connect terminal 1 with terminal 9 and terminal 2 with
terminal 8.
The cable inlet of the PH8HS3 holder is located on the right-hand side of the chassis’s upper
section. When wiring the cable, loosen the two screws and remove the cover (for protection
against drips). After the completion of wiring, always make sure the cover is reinstalled in
place.