13
2551 Blind Magmeter
Symptom
Possible Cause
Solution
Output is erratic
and unstable.
Magmeter installed too close to upstream
obstruction.
Relocate the magmeter to have straight
uninterrupted pipe upstream of the sensor
for at least 10 x the pipe diameter.
Magmeter located in area exposed to air
bubbles/pockets.
Eliminate air bubbles in the pipe.
Magmeter is installed in pipe backwards.
Remove the magmeter and reinstall with
the fl ow direction arrow on the sensor body
pointed DOWNSTREAM.
Electrical noise is interfering with the
measurement.
Review the grounding of the magmeter and
the pipe. Install adequate Earth ground to
allow the Magmeter to operate properly.
Electrodes are coated with solids.
Carefully clean the electrodes. Refer to
sensor manual for details.
New sensor; metal surface not properly
conditioned.
Soak sensor overnight in fl uid.
Output is not 0 when fl ow
is stopped.
Electrodes not adequately conditioned.
Soak sensor overnight in fl uid.
Vibration or other movement in pipe causes
magmeter to detect fl ow.
Increase the Low Flow Cutoff .
Electrical noise interference.
Modify grounding to protect the Magmeter
from interference.
Defective Magmeter.
Return to factory for service.
4-20 mA current output
is incorrect.
Loop device not scaled same as Magmeter.
Use 3-0252 Setup tool to re-span the
Magmeter to match Loop device.
Re-span Loop device to match Magmeter.
Range Jumper not placed correctly.
Set Range Jumper correctly.
Defective Magmeter.
Return to factory for service
Frequency output is
inoperative
Digital (S
3
L) output is
inoperative.
Loop output is
inoperative.
2551 is wrong model.
Frequency/S
3
L model: 3-2551-XX-11
Blue jumper not in correct position.
Place blue jumper correctly. (Pg. 4)
Wiring is not correct.
Check wiring, make corrections. (Pg. 7)
Frequency input to other manufacturer's
fl ow instrument does not have pull-up
resistor.
Install 10 kΩ resistor. (Pg. 7)
Output is 22.1 mA
Conductivity is less than 20 μS/cm (the fl uid
is too clean for Magmeter).
Unsuitable application for Magmeter.
Electronic component failure.
Return 2551 to factory.
Maintenance
The 2551 Magmeter requires very little maintenance. There are no user-serviceable components in the Magmeter.
• If the fl uid contains deposits and solids that may coat the electrodes, a regular cleaning schedule 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 at the tip of the sensor.
Environmental Recommendations:
• When used properly, this product presents no inherent danger to the environment.
• Please follow local ordinances when disposing of this or any product with electronic components.
Troubleshooting
