GF Signet 2552 Metal Magmeter Flow Sensor - Manual (Page 12)

12 2552 Magmeter
• Conductivity is less than 20 μS/cm.
• Electrical noise
• Electronic component failure.
• 4 to 20 mA is not scaled same as
Loop device.
• Loop device is not scaled same as
Magmeter.
• Defective Magmeter
• Magmeter installed too close to
upstream obstruction.
• Magmeter electrodes are coated.
• Magmeter electrodes exposed to air
bubbles/pockets.
• Electrical noise is interfering with the
measurement.
• New sensor, metal surface not
properly conditioned.
• Output is not 0 when fl ow is stopped.
• Frequency, Digital or Current
output is erratic.
• Output is 22.1 mA.
• Electrodes not adequately conditioned.
• Flow rate is less than Low fl ow cutoff
value.
• Electrical noise is interfering with the
measurement.
• Defective Magmeter
Symptom Possible Cause Possible Solution
• Frequency output is inoperative
• Digital (S 3 L) output is inoperative.
• Loop output is inoperative.
• Move the Magmeter upstream at least
10 pipe diameters from obstruction.
• Clean the electrodes with soft cloth.
Do not use abrasives.
• Eliminate air bubbles in the pipe.
• Remove the Magmeter and reinstall
with the fl ow direction arrow on the
sensor body pointed DOWNSTREAM.
• Modify grounding as required
to protect the Magmeter from
interference.
• Soak sensor overnight in fl uid.
8.4 Troubleshooting Table
• Soak sensor overnight in fl uid.
• Confi gure pipe so electrodes are
always in fl uid.
• Modify grounding as required
to protect the Magmeter from
interference.
• Adjust low fl ow cutoff higher.
• Return to factory for service.
• Use 3-0250 Span and Setup tool to
set output range.
• Respan Loop device to match
Magmeter.
• Return to factory for service.
• 2552 is wrong model.
• Wiring is not correct.
• Frequency input to other
manufacturer's fl ow instrument does
not have pull-up resistor.
• Freq/S 3 L model is 3-2552-XX-11.
• Blue wire must be grounded for freq
out, open for S
3 L out.
• 4 to 20 mA model is 3-2552-XX-12.
• Check wiring, make corrections.
• Install 10k
Ω resistor.
• Unsuitable application for Magmeter.
• Check grounding, eliminate noise
source
• Return to factory for service.
• 4 to 20 mA output is incorrect.
8.3 Troubleshooting with the RED and BLUE lights
The 2552 uses two colored LEDs to indicate the status of the measurement. They are located at the top of the magmeter, recessed
inside the threaded steel housing. Look down the outer housing to see them.
No Lights: The power is off or the sensor is not connected
Solid Blue: The power is on but there is no fl ow in the pipe.
Blinking Blue: Normal operation, blink rate is proportional to the fl ow rate.
Alternating Red-Blue: Empty pipe indication (electrodes are not wet.)
Blinking Red: System errors (Generally indicates electrical noise interference)
Solid Red: Instrument error (Generally indicates defective electronics component)
The lights are for troubleshooting guidance only and are not absolute fault indicators.
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Environmental Recommendations:
•
When used properly, this product presents no inherent danger to the environment.
• Please follow all appropriate local ordinances when disposing of this or any product with electronic components.
8.5 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.
• If the sensor nut will not turn smoothly, a light lubricant can be applied to the threads.