Yokogawa DO30G Dissolved Oxygen Sensor - Manual (Page 15)

<3. Installing the Sensor and Connecting the Cable>
3-2
IM 12J5B3-01E
3.2 Installation
Normally, the DO30G Dissolved Oxygen Sensor is assembled into the PH8HG Guide Pipe,
PB350G Angled Floating Ball Holder or DOX8HS Immersion Type Holder and submersed to the
point best suited to obtain precise measurement results. This section explains how to select the
measurement point and sensor holder.
3.2.1 Selecting the Measurement Point
Normally, a location that meets the following requirements may be selected as the measurement
point.
l The measured value is representative among the values available for the solu-
tion under measurement (SUM).
Avoid choosing a location where the solution is unevenly distributed, since heavy hunting may
result in the measured value. Also, avoid locations where bubbles occur frequently.
l The temperature and flowrate comply with the operating conditions required
of the sensor and holder.
Note that, if a measured solution running at a high flow rate contains particles of sand, the perme-
able membrane of the sensor may be damaged.
Do not install the sensor at a depth greater than 3 m.
3.2.2 Selecting the Sensor Holder
Each holder or fitting where the DO30G Dissolved Oxygen Sensor is assembled has the follow-
ing characteristics.
Choose a holder that suits the liquid to be measured and the measurement location.
[PH8HG Guide Pipe]
The holder is made of PVC resin and is 2 m long. The sensor is suspended down inside the cylin-
drical barrel of the holder. This pipe is conveniently suited for the measurement of a solution free
from bubbles or pollutants.
Stopper
Guide pipe
Dissolved oxygen sensor
Sensor cable
Mounting pipe
(Outer diameter of 60.5 mm)
F05.ai
Figure 3.2 Suspension of Dissolved Oxygen Sensor Using PH8HG Guide Pipe
4th Edition : Apr 05,2011