Selecting A Location - Signet 2551 Manual

3. Installation: Pipe ¿ ttings
Georg Fischer offers a wide selection of installation ¿ ttings that control the position of the Magmeter electrodes in relation to the
dimensions of the pipe. You will ¿ nd a complete list of order numbers for installation ¿ ttings in the Calibration Tables on pages 7-10.
Type Description
Plastic
• 0.5 to 2 inch versions
tees
• MPVC or CPVC
• Available in 10 and 12 inch sizes only
PVC
Glue-on • Cut 2-1/2 inch hole in pipe
Saddles • Weld in place using solvent cement
PVC
• 2 to 4 inch, cut 1-7/16 inch hole in pipe
Clamp-on
• 6 to 8 inch, cut 2-1/8 inch hole in pipe
Saddles
Iron
• 2 to 4 inch, cut 1-7/16 inch hole in pipe
Strap-on
• Over 4 inch, cut 2-1/8 inch hole in pipe
saddles
• Special order 14 in. to 36 in.

4. Selecting a Location

• The 2551 requires a full pipe and a fully developed turbulent À ow pro¿ 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 À 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 suf¿ cient distance of
straight pipe immediately upstream of the sensor.
Locating the sensor in a trap or where the À ow is
upward helps to protect the sensor from exposure
to air bubbles when the system is in operation.
These con¿ gurations are not recommended
because it is dif¿ cult to keep the pipe full.
In a gravity-À 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.
2551 Magmeter
Type
Iron, Carbon Steel,
316 SS
Threaded tees
Carbon steel &
stainless steel
Weld-on
Weldolets
Fiberglass
tees
FPT
Union Fittings and
Wafers
Reducer
2 x 90° Elbow
3 dimensions
2 x 90° Elbow
25 x I.D. 5 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
Flow 6.25 GPM
Total 1234567.8>
Signet Flow
Transmitter
ENTER
Flow
90° Elbow
15 x I.D. 5 x I.D.
20 x I.D.
Pump/Valve
40 x I.D. 5 x I.D. 50 x I.D.
OK OK
Vertical flow is OK if the pipe remains full at all times.
Flow 6.25 GPM
Total 1234567.8>
Signet Flow
Transmitter
ENTER
Flow
5 x I.D.
5 x I.D.
3