Yokogawa FD20 Immersion Fitting - Manual (Page 8)

IM 12B6K2-01E-E
8
3. INSTALLATION
3-1. Selecting the installation site
It is important that, whatever method of
mounting is used, the point of measurement is
truly representative for the entire solution.
- Avoid an area where the measurement value
varies significantly.
- Ensure that the sensors are always immersed
in the process liquid (not dry).
- When selecting the installation site, first check
that the liquid temperature and pressure
meets the sensors and fittings requirements.
- If the fitting is used in a tank with stirrer
or agitator, or if it is placed in a fast flowing
process, care must be taken that it
is adequately supported to prevent any
movement.
- Install the fitting in a site where it can be easily maintained.
The mounting position of the sensors must be within the area as shown in figure 3-1.
3-2. Installation
Before installing the immersion fitting, check that all parts and accessories were supplied by
Yokogawa.
Ensure that there is enough spare around to withdraw the fitting for calibration and mainte-
nance.
3-2-1. “Hoisting eye” type mounting
On top of each fitting is a “hoisting eye” to withdraw from the process.
3-2-2. Flange mounting fitting
If ordered, the immersion fittings are supplied with a flange for fixing in a tank. The flange is
connected to the fitting as shown in the dimensional drawings. These drawings also show
the configuration of holes.
The max. pressure is 3 bar. For higher pressure ratings and other types of flanges please
contact your local Sales Department of Yokogawa.
Table 2. Flanges being used as a standard
INCORRECT
15º 15º
HORIZONTAL
GOOD GOOD
Fig. 3-1. Mounting position of sensors
Type Material TypePP Material DN Thickness
fitting fitting flange flange flange
1-hole PVC glue-flange PVC 32
3-hole SS weld-flange SS 80 10 mm
4-hole SS weld-flange SS 100 10 mm
3-hole PP collar-bush + PP + 80
lap-joint flange PP (steal inlay)
4-hole PP collar-bush + PP + 125
lap-joint flange PP (steal inlay)
3-hole PVDF collar-bush + PVDF + 80
lap-joint flange PP (steal inlay)
4-hole PVDF collar-bush + PVDF + 125
lap-joint flange PP (steal inlay)