Maintenance, 1 routine inspection, 2 checking of membrane assembly locknut – Yokogawa DO30G Dissolved Oxygen Sensor User Manual
Page 17: 3 connecting the sensor cable, 3 asembling the sensor in the holder, Caution
<3. Installing the Sensor and Connecting the Cable>
3-4
IM 12J5B3-01E
3.2.3
Asembling the Sensor in the Holder
For details on how to assmble the sensor in the holder or fitting, see the appropriate instruction
manual for each holder or fitting.
CAUTION
Exercise care not to contaminate or wet the tip of the sensor cable when assembling the sensor.
If you will not begin wiring the sensor cable immediately, take the protective measures necessary
to prevent the assembly from being damaged.
Sensor mounting in the case where flocs and other matter are contained in the SUM
Stopper
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The stopper projecting from the membrane assembly locknut serves to prevent the membrane
from being in contact with the ground and thus being damaged. If there are flocs in the SUM, the
stopper may become clogged. Thus, assemble the sensor to the holder so that the stopper is
positioned downstream in the SUM.
3.3
Connecting the Sensor Cable
The cable of the dissolved oxygen sensor must be connected to the terminals of the dissolved
oxygen converter. For information on connections, refer to the following instruction manu-
als: DO402G Dissolved Oxygen Converter (IM 12J05D02-01E), the DO202/FLXA21 2-wire
Transmitter instruction manual (IM 12J05C01-01E/IM 12A01A02-01E) or WTB10-DO Relay
Terminal Box (IM 12J05W02-01E).
F08.ai
IE
T1
T2
SE
RE
S
13
17
21
11
12
14
15
16
13
11
12
14
15
16
(*1)
Dissolved oxygen
converter terminals for
connection to sensor
cable
Sensor cable
Jumper
*1: Liquid earth to detect membrane failure.
This function is available when using
PB350G/PB360G float type holder.
Connect only when using this function.
Figure 3.5
Connection of Sensor Cable
Now the explanation on the installation and wiring is completed. For details on operation during
startup or for regular operation after the entire measuring system is brought into operation, refer
to the DO402G Dissolved Oxygen Converter instruction manual (IM 12J05D02-01E), the DO202/
FLXA21 2-wire Transmitter instruction manual (IM 12J05C01-01E/IM 12A01A02-01E). The main-
tenance and service of the dissolved oxygen sensor is explained in Section 4 that follows.
4th Edition : Apr 05,2011