Xylem EX100/200-Series ELECTROMAGNETIC FLOW SENSORS User Manual
Page 4
Piping.
For best results, the EX sensor should be in-
stalled with at least ten diameters of straight pipe
upstream and five downstream. Certain extreme situations
such as partially-opened valves are particularly difficult and
may require more straight diameters upstream (see page 6
for straight pipe recommendations).
Immersion.
The 100/200-Series sensors are not designed
for underwater operation. Even occasional immersion can
cause damage. If occasional immersion, such as when a
vault floods, then the -40 option, (immersion) is recomended.
Chemical Injection or Fertigation.
When any magmeter, by
any manufacturer, is used in a chemical injection applica-
tion (including fertigation), the chemical line must be placed
downstream of the magmeter OR far enough upstream for
complete mixing to occur before the fluid reaches the meter.
When unmixed chemical or fertilizer alternates with water
passing through the meter, the rapid changes in conductivity
may cause sudden spikes and drops in the meter’s reading,
resulting in inaccurate measurement. The magmeter will
restabilize, however, with a steady flow of fluid of uniform
conductivity.
Page 2
Caution:
These flow sensors are not rec-
ommended for installation downstream
of a boiler feedwater pump where instal-
lation fault may expose the flow sensor
to boiler pressure and temperature. Maximum
recommended temperature is 200°F.
INSTALLATION
DISTORTED FLOWS
FLOW
POSITIONING THE METER
Vertical flow in upward direction is the preferred installation
orientation, since it improves low-flow performance and avoids
problems with trapped air and sediment. Bottom, top, and
vertical pipe installations are all acceptable if required by
the piping layout.
Fair
(Unacceptable position
if air is present)
Best
Position
Fair
(Unacceptable position if fluid
contains sediment)
Faster Flow
Causes Meter
To Read High
10X
5X
Distorted
Flow Profile
Caution:
In chemical injection or fertiga-
tion applications, install chemical line
downstream of magmeter, or far enough
upstream to allow complete mixing of
fluids before the meter.