4
Signet 2551 Display Magmeter
• The 2551 requires a full pipe and a fully developed turbulent
fl
ow pro
fi
le for
accurate measurement.
• If the piping system harbors air pockets or bubbles, take steps to locate the
sensor so the air pockets will not contact the electrodes.
• In vertical installations, assemble the 2551 so the conduit ports are facing
downward. This prevents condensation inside the conduit from being directed
into the 2551 electronics housing.
• Chemical injection systems can temporarily alter the
fl
uid conductivity and
cause anomalies in the magmeter measurement.
To avoid this problem, install the magmeter UPSTREAM of the injection point.
Reducer
15 x I.D.
5 x I.D.
20 x I.D.
5 x I.D.
90° Elbow
25 x I.D.
5 x I.D.
2 x 90° Elbow
40 x I.D.
5 x I.D.
2 x 90° Elbow
3 dimensions
50 x I.D.
5 x I.D.
Pump/Valve
Vertical flow is OK if the pipe remains full at all times.
+GF+
OK
+
GF
+
OK
+GF
+
OK
Georg Fischer offers a wide selection of installation
fi
ttings that control the position of the Magmeter electrodes in relation to the
dimensions of the pipe. You will
fi
nd a complete list of order numbers for installation
fi
ttings in the Calibration Tables on pages 12-13.
Select a location with suf
fi
cient distance of straight pipe immediately upstream of the sensor.
Locating the sensor in a trap or where
the
fl
ow is upward helps to protect the
sensor from exposure to air bubbles
when the system is in operation.
These con
fi
gurations are not recommended
because it is dif
fi
cult to keep the pipe full.
Type
Description
• 2 to 4 inch, cut 1-7/16 inch hole in pipe
• Over 4 inch, cut 2-1/8 inch hole in pipe
• Special order 14 in. to 36 in.
• 0.5 to 2 inch versions
• MPVC or CPVC
• 2 to 4 inch, cut 1-7/16 inch hole in pipe
• 6 to 8 inch, cut 2-1/8 inch hole in pipe
• Available in 10 and 12 inch sizes only
• Cut 2-1/2 inch hole in pipe
• Weld in place using solvent cement
Iron, Carbon Steel,
316 SS
Threaded tees
Carbon steel &
stainless steel
Weld-on
Weldolets
• 2 to 4 inch, cut 1-7/16 inch hole in pipe
• Over 4 inch, cut 2-1/8 inch hole in pipe
• For pipes from DN 15 to 50 mm
• PP or PVDF
Type Description
Plastic
tees
Union Fittings and
Wafers
PVC
Clamp-on
Saddles
Iron
Strap-on
saddles
PVC
Glue-on
Saddles
• 1.5 in. to 2 in. PVDF insert
Fiberglass
tees
FPT
• 0.5 to 2 in. versions
• Mounts on threaded pipe ends
In a gravity-
fl
ow system, the tank must be designed
so the level does not drop below the outlet.
This causes the pipe to draw air in from the tank.
If air bubbles pass across the Magmeter electrodes,
the output will become erratic.
Pipe Fittings
Selecting a Location
+GF+
+
GF
+
ENTER
9900
2551
9900
2551
ENTER
Injection Point
Injection Point
