Yokogawa FS20 Fittings for pH and ORP - Manual (Page 10)

IM 12B6K1-01E-E
8
3. PIPING AND INSTALLATION
3-1. General
It is important that, whatever method of mounting is used, the point of measurment is
truly representative of the entrie solution. Avoid an area where the measurement varies
significantly or the flow can be interrupted (the sensors must always be immersed in the
process liquid). The recommended type of fitting or subassembly will depend on pressure,
temperature, kind of liquid, pollution, etc. Check whether the specifications of the fitting/
subassembly and electrodes fulfil the maximum occuring process conditions. The fitting/
suassembly has several options and optional connection possibilities. Check that you
received the correct size and type.
3-2. Piping
3-2-1. Mounting in a sample line
Part of the process liquid is tapped off to the flow fitting or subassembly (see fig. 3-1).
Figure 3-1
3-2-2. Mounting in a shunt line
By means of restrictor in the main line a small flow of the process liquid is lead through
the flow fitting or subassembly via the shunt line (see fig. 3-2). The pressure in the fitting or
subassembly is controlled by means of two valves.
Figure 3-2
PROCESS PIPING P1
RESTRICTOR
P2
P2 < P1
12B6K1-41
MOUNTING IN A
SHUNT LINE
PROCESS PIPING
DRAIN
12B6K1-40
MOUNTING IN A
SAMPLE LINE