Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 - Manual (Page 28)

<2. WIRING AND INSTALLATION>
2-1
IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00
2. WIRING AND INSTALLATION
Install the cable glands into the FLXA21 before installing it (see section 2.3.) Upon delivery, the
cable glands are not installed.
(Plastic housing) (Stainless steel
housing)
*2 *2
*4
*5
*6
*6
n n n n n n n n n
n n n n n n n n n
+
–
*1: Use a 2-wire shielded cable with an outside diameter of 6 to 12 mm.
*2: Connect the analyzer to gland. (Class D ground: 100 ohm or less)
The way of connecting the grounding cable varies depending on the plastic housing and stainless steel
housing.
In the case of the plastic housing, connect the grounding cable to the terminal of the power module inside,
and in the case of the stainless steel housing, connect the grounding cable to the terminal of the housing.
Use a cable with an outside diameter of 3.4 to 7 mm for the grounding line of the plastic housing.
The minimum cross sectional area of the protective grounding cable should be 0.75 mm 2 .
*3: This line is connected to a distributor or 24V DC power supply.
*4: Terminal numbers for each sensor module are shown below.
*5: Two modules of the same kind of measurement/sensor type can be installed. When measuring inductive
conductivity or pH/ORP with the SENCOM sensor, only one module can be installed.
*6: The terminal box may be necessary depending on the sensor cable length and the distance between the
analyzer and the sensor.
The SENCOM sensor is to be connected directly to the analyzer without a terminal box.
*7: Two outputs, output 1 and output2, of PH201G or SDBT are same signals.
*1
WTB10 or BA10
Terminal box
FLXA21 2-Wire Analyzer
Sensor
WTB10 or BA10
Terminal box
Sensor
PH Module
SC Module
ISC Module
DO Module
SENCOM Module
16 15 19 17 13 18 14 12 11
PH
NC 18 17 14 13 15 16 12 11
DO
15 16 14 17 13 12 11
ISC
NC 16 15 14 13 12 11
SC
87 86 NC 84 83 82 NC
SENCOM
Power supply
Output 1 (1-5V DC)
20 to 130V DC
or
80 to 138V AC, 47 to 63Hz
Power supply
20 to 130V DC
or
80 to 138V AC, 47 to 63Hz
HOLD WASH
FAIL
Output 2 (1-5V DC)
Output 1 (1-5V DC)
Output 2 (1-5V DC)
Case of Distributor
PH201G (Style B)
Case of Distributor
SDBT
(*3)
*3
*7
*7
(*3)
A
+
– CMN CMN
B
C
D
F
H
L N
A
+
–
+
–
B
1
+
–
2
F
H
L N
b
a
d
c
f
e
Figure 2.1 Wiring diagrams
PH
SC
ISC
DO
SENCOM
2