Installation; Pipe Fittings; Selecting A Location - GF Signet 2551 Operating Instructions Manual

Pipe Fittings

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.
Type
Plastic
tees
PVC
Glue-on
Saddles
PVC
Clamp-on
Saddles
Iron
Strap-on
saddles

Selecting a Location

• The 2551 requires a full pipe and a fully developed turbulent fl ow profi 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.
Select a location with suffi cient distance of straight pipe immediately upstream of the sensor.
Reducer 90° Elbow
15 x I.D. 5 x I.D.
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 confi gurations are not recommended
because it is diffi cult to keep the pipe full.
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.
4 Signet 2551 Display Magmeter
Description
• 0.5 to 2 inch versions
• MPVC or CPVC
• Available in 10 and 12 inch sizes only
• Cut 2-1/2 inch hole in pipe
• Weld in place using solvent cement
• 2 to 4 inch, cut 1-7/16 inch hole in pipe
• 6 to 8 inch, cut 2-1/8 inch hole in pipe
• 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.
2 x 90° Elbow
20 x I.D. 5 x I.D.
Type
Iron, Carbon Steel,
316 SS
Threaded tees
Carbon steel &
stainless steel
Weld-on
Weldolets
Fiberglass
tees
FPT
Union Fittings and
Wafers
2 x 90° Elbow
3 dimensions
25 x I.D. 5 x I.D. 40 x I.D.
OK
+GF+
+GF+
Description
• 0.5 to 2 in. versions
• Mounts on threaded pipe ends
• 2 to 4 inch, cut 1-7/16 inch hole in pipe
• Over 4 inch, cut 2-1/8 inch hole in pipe
• 1.5 in. to 2 in. PVDF insert
• For pipes from DN 15 to 50 mm
• PP or PVDF
Injection Point 9900
ENTER
9900 Injection Point
2551
ENTER
Pump/Valve
5 x I.D.
50 x I.D.
OK OK
Vertical flow is OK if the pipe remains full at all times.
2551
5 x I.D.