Table of Contents
Advertisement
11. 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 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.
11.1 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.
11.2 Troubleshooting
Symptom
Output is erratic and unstable.
Output is not 0 when À ow is stopped.
4-20 mA current output is incorrect.
Frequency output is inoperative
3
Digital (S
L) output is inoperative.
Loop output is inoperative.
Output is 22.1 mA
11.3 Troubleshooting with the RED and BLUE LEDs
Both Off:
The power is off or the sensor is not connected.
Solid Blue:
The power is on, the pipe is full, but there is no À ow in the pipe.
Blinking Blue:
Normal operation, blink rate is proportional to the À ow rate.
Alternating Red-Blue:
Empty pipe indication (electrodes are not wet).
Blinking Red:
System errors (electrical noise interference).
Solid Red:
Instrument error (defective electronics component).
If the 2551 detects an empty pipe:
• Frequency output will be locked to 0 Hz if electrodes are not wet.
3
• Digital (S
L) output will be locked to 0 if electrodes are not wet.
• 4 to 20 mA will be locked to 4 mA if electrodes are not wet.
• Blue and red LEDs will blink alternately if electrodes are not wet.
If the 2551 detects REVERSE FLOW:
• Frequency out cannot distinguish reverse À ow from forward À ow. The output will be the absolute value.
3
• With Digital (S
L) output, reverse À ow results in 0 À ow rate displayed on 8900 or with negative numbers on the 9900.
• 4-20 mA output can be spanned into negative À ow range using the 3-0250 USB Setup Tool and software. (See section 9)
(example: 4-20 mA = –100 to +100 GPM).
2551 Magmeter
Possible Cause
Magmeter installed too close to upstream
obstruction.
Magmeter located in area exposed to air
bubbles/pockets.
Magmeter is installed in pipe backwards.
Electrical noise is interfering with the
measurement.
Electrodes are coated with solids.
New sensor; metal surface not properly
conditioned.
Electrodes not adequately conditioned.
Vibration or other movement in pipe
magmeter to detect À ow.
Electrical noise interference.
Defective Magmeter.
Loop device not scaled same as Magmeter.
Range Jumper not placed correctly.
Defective Magmeter.
2551 is wrong model.
Blue jumper not in correct position.
Wiring is not correct.
Frequency input to other manufacturer's À ow
instrument does not have pull-up resistor.
Conductivity is less than 20 —S/cm (the À uid
is too clean for Magmeter).
Electronic component failure.
Relocate the magmeter to have straight
uninterrupted pipe upstream of the sensor for
at least 10 x the pipe diameter.
Eliminate air bubbles in the pipe.
Remove the magmeter and reinstall with the
À ow direction arrow on the sensor body pointed
DOWNSTREAM.
Review the grounding of the magmeter and the
pipe. Install adequate Earth ground to allow the
Magmeter to operate properly.
Carefully clean the electrodes. Refer to sensor
manual for details.
Soak sensor overnight in À uid.
Soak sensor overnight in À uid.
causes
Increase the Low Flow Cutoff.
Modify grounding to protect the Magmeter from
interference.
Return to factory for service.
Use 3-0250 Setup tool to respan the Magmeter
to match Loop device.
Respan Loop device to match Magmeter.
Set Range Jumper correctly.
Return to factory for service
Frequency/S
3
L model: 3-2551-11
Place blue jumper correctly. (Sec. 5 pg. 4)
Check wiring, make corrections.
Install 10 kŸ resistor. (section 8.1, pg. 6)
Unsuitable application for Magmeter.
Return 2551 to factory.
Solution
4
3
2
1
D7
D6
Flow
Flow
11
Advertisement
Table of Contents
