Seametrics EX100-200-Series 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

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.