YOKOGAWA PH8EFP, Руководство пользователя

Страница: 18 / 37

IM 12B7J1-01E
< 2. Installation >
2-3
2.2 Requirements for mounting the pH sensor
2.2.1 In case of installing the PH8HG Guide-pipe Holder
To install the sensor in the guide pipe, proceed as follows:
(1) Connect the sensor cable to the associated instrument correctly by referring to Section 2.3
provided later.
(2) Mount the liquid junction in the sensor body. Peel off the seal attached to the liquid junction
mounting hole in the sensor body. Screw the liquid junction gently two or three turns into the
hole.
(3) If specified, a reserve tank containing 250 mL KCl solution and mounting hardware to hold
this tank are supplied with the PH8EFP pH sensor. Attach the holding hardware to the pipe
(nominal diameter 50 mm). Connect the reserve tank to the KCl solution supply tube of the
sensor. Remove the cap from the tank and screw the tube connector securely into the tank.
(4) Supply KCl solution to the sensor (see Figure 2.3). First, mount the reserve tank on the
mounting hardware with the tube connection part directed downwards. Using the pin
supplied with the tank, make several holes it its top (see Figure 2.3). Stand the sensor
upside down at a lower position than the reserve tank as shown in Figure 2.3 so that KCl
solution flows from the tank into the sensor. When the KCl solution fills the sensor and
overflows from the liquid junction mounting hole, securely screw the liquid junction into the
mounting hole.
F2.3.ai
KCl Solution Tube
General Purpose
Reserve Tank
Sensor Body
Liquid Junction (Loose)
Leave air space in the tank.
(Make several holes using the
pin supplied with the tank)
Figure 2.3 Supplying KCl Solution to Sensor Body
For the Big-volume reserve tank, refer to page 2-9 to 2-10.
(5) Attach the "stopper" supplied with the guide pipe to the sensor cable.
Fix the sensor cable so that the sensor tip projects 20 to 30 mm out from the pipe end when
the pH sensor is suspended in the guide pipe as shown in Figure 2.4.
NOTE
If the sensor tip does not project out from the pipe end, the measured value may not respond
promptly to the pH variations of the measured solution. This may cause problems for pH
measurement and control. On the other hand, if the sensor tip projects too far from the pipe end,
the force on the sensor may damage the sensor cable from scraping it against the pipe.
12th Edition : Dec.14,2018-00