Installation And Grounding; Positioning The Meter, Straight Pipe Recommendations, Full Pipe Recommendations, Fittings, Calibration, Chemical Injection, Installing Gaskets - Seametrics iMAG Instructions Manual

INSTALLATION and GROUNDING

INSTALLATION
Caution: These flow sensors are not recommended
where installation may expose the flow sensor to boiler
pressure and temperature. Maximum
recommended operating temperature is 130˚ F.
Positioning the Meter. These meters can be installed
horizontally, vertically, and in any radial position. Using a
check valve on the upstream side of the meter, and/or an air
vent (vacuum relief valve) in the same, unobstructed run of
pipe as the meter, is required in any installation where the
meter may be exposed to suction when the system is not in
normal operation. Suction can cause damage to the liner.
Liner damage caused by suction, without the use of a check
valve and/or air vent, may void the warranty.
Straight Pipe Recommendations. As with most flow meters,
the iMAG requires straight pipe before and after the meter for
best accuracy. However, the ability of electromagnetic meters
to average the flow across the entire pipe allows for shorter
straight pipe recommendations than most mechanical meters
(see page 7).
Full Pipe Recommendations. All magmeters require a
method for determining that the pipe is empty, to prevent false
reading. This meter is designed to indicate 'EMPTY PIPE' if one
or more electrodes is exposed. For highest accuracy, install
the meter so that the pipe will be full when there is flow. If air
bubbles may be present in the pipe or sludge accumulation
is an issue, rotate the meter by one flange hole to position
the control housing at a 45˚ angle (see diagrams on page 8).
Fittings. The iMAG flanges have standard ANSI 150 lb. drilling
pattern and mate with any other ANSI 150 lb. flange. See table
on next page for flange bolt tightening torque specifications.
Calibration. The iMAG is factory-calibrated and will not require
any form of field calibration.
Chemical Injection. When any magmeter, by any manufac-
turer, is used in a chemical injection application, the chemical
injection point must be placed downstream of the magme-
ter OR far enough upstream for complete mixing to occur
before the fluid reaches the meter. When unmixed chemical
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.
Caution: In chemical injection applications, install
chemical injection point downstream of magmeter, or
far enough upstream to allow complete mixing of fluids.
Page 6
Installing Gaskets
GASKETS
Gaskets are required at all junctions.
(Not applicable to 3" model.)
1. Select a suitable full-face gasket.
• Only use flat compressible gaskets (either pliable
or hard fiber will work).
• Use a material compatible with the fluid you will be
using.
• Thickness should be 1/8" - 1/4" (3 - 6 mm),
depending on the flatness of the pipe flange
surface.
• Inner diameter must be larger than opening in flow
meter.
2. Be sure all mating surfaces are smooth and free of
debris.
3. Install gaskets on each end of meter as shown in
diagrams below. If using grounding rings, install one
gasket on each side of the grounding ring.
Installation without gaskets
Grounding
Installation with gaskets
Gaskets
Rings
Gaskets