GF Signet 2551 Magmeter Flow Sensor - Display - Manual (Page 18)

18 2551 Magmeter
Grounding rings on plastic pipe
(Install between flanges)
or
metal straps on metal pipe
Sensor
Grounding ring
(10 cm to 1.3 m) (10 cm to 1.3 m)
4 in. to 50 in. 4 in. to 50 in.
Instrument
4.
2. 2.
Do not terminate
shield at Magmeter
3.
1.
12. Technical Information
12.1 Grounding
Precalibration conditioning: The magmeter may appear to be unstable immediately after installation. Allow the sensor to sit in a full pipe
for 24 hours before beginning calibration and operation.
• Use a cable gland or a liquid tight connector to seal the cable ports from water intrusion.
• Use PTFE tape or a suitable sealant on cable ports.
• The 2551 magmeter must be carefully grounded to eliminate electrical noise that may interfere with the measurement.
• Grounding requirements will vary with each installation.
• The following recommendations should be applied in sequence until the interference is eliminated.
c
The ground terminal on the outside of the yellow housing is connected internally to the grounding ring at the tip of the sensor.
Connect a conductor (14 AWG/1.5 mm 2 wire recommended) from this terminal directly to Earth ground to prevent electrical noise
from interfering with the magmeter signal.
If the interference persists, apply step #2:
d
Connect grounding rings, metal clamps or grounding electrodes to the pipe immediately upstream and downstream of the
magmeter sensor location. These devices must be in contact with the À uid.
If the interference persists, apply step #3:
e
The shield from the output cable must be terminated at the remote instrument ONLY.
This shield must not be connected at both ends!
If the interference persists, apply step #4:
f
Connect an additional wire (minimum AWG 14/1.5 mm 2 ) from the remote instrument ground to the magmeter ground terminal.
Environmental Recommendations:
• When used properly, this product presents no inherent danger to the environment.
• Please follow local ordinance when disposing of this or any product with electronic components.
12.2 Maintenance
The 2551 Magmeter requires very little maintenance. There are no user-serviceable components in the magmeter.
• If the À uid contains deposits and solids that may coat the electrodes, a regular cleaning regimen is recommended.
• Do not use abrasive materials on the metal electrodes. Clean with soft cloth and mild detergent only.
• Use a cotton swab and mild detergent to remove deposits on the metal electrodes.