Yokogawa FU20/PH20 All-in-One pH/ORP Sensor - Manual (Page 5)

IM 12B6J3-02E-E
3
3. INSTALLATION OF FU20
For optimum measurement results, the
FU20 should be installed in a location that
offers an acceptable representation of the
process composition and
DOES NOT
exceed the specifications of the sensor.
The FU20 is designed with threads on
either end of the body
3 /
4
” NPT to allow
installation in a wide variety of applications.
3-1. Typical Installation
The FU20 sensor is designed for in-line
installation, via a bypass loop as an
immersion assembly. For best results the
FU20 should be mounted with the process
coming towards the sensor (Figure 2) and
positioned at least 15° above the horizontal
plane to eliminate air bubbles in the glass
bulb.
3-2. Preparing the Sensor for Use
Remove the sensor from its shipping box
and slide off the “wet pocket” (the tube
filled with solution to keep the measuring
elements from drying out in storage or
shipment).
IMPORTANT NOTICE
Before mounting the sensor, it should
be calibrated. The calibration procedure
is normally described in the Instruction
Manual of the pH transmitter, but a general
calibration is given in section 5 of this
manual.
3.3 Mounting the Sensor
The FU20 can be mounted using the
threads on the body of the sensor (Figure
1). Apply Teflon tape to the appropriate
threaded end, then install in the process.
The FU20 can also be mounted using the
threaded end of the quick release adapter.
Apply Teflon (PTFE) tape to the threaded
end of the quick release adapter (step 2).
Then install the adapter (/NSS, /NTI, /BSP
or /BTI) in the process, tightening it by
applying a suitable torque using a spanner
on the adapter flats, steps 1 & 3.
Next, slide the mating part of the adapter
from the cable end of the FU20 (step 4)
sensor and mount into the adapter making
sure that the O-ring seats properly (step 5 &
6). Hand tightened the adapter nut (step 7).
NOTE:
DO NOT over tighten the sensor, as
damage may result.
See Section 4 for instructions to wire the
sensor to the instrument.
PG7
FU20
TeflonTape
PG7
FU20
Figure 1. Sensor Installation