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9
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 entire 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.
3.1.1. Mounting location
The flow fitting or subassembly flow fitting
is intended to be used for pH and/or ORP
(Redox) measurement. The location should
be in a bypass of a piping system behind a
G O O D
G O O D
sample valve. The angle of the fitting with the
horizontal should be less than 15°
HORIZONTAL
(see fig. 3.0).
1 5 º
1 5 º
The pressure and temperature ratings of the
electrode inside the fitting should be noticed
to determine the maximum rating of the
measurement point.
INCORRECT
Fig. 3.0
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).
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
12B6K1-40
12B6K1-41
MOUNTING IN A
MOUNTING IN A
subassembly is controlled by means of two valves.
SAMPLE LINE
SHUNT LINE
RESTRICTOR
P1
PROCESS PIPING
P2
PROCESS PIPING
P2 < P1
DRAIN
Figure 3.1
Figure 3.2
IM 12B06K01-01E-E
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