The reading seems erratic
|Incorrect grounding of the flowmeter can affect reading||Flowmeter should only be grounded to liquid (see also here)|
|Air is interrupting the measurement||ensure the sensor is fully submerged|
|Air is trapped on top of pipe||install the sensor at an angle|
|Air is being pulled in through vortex||move sensor to different location|
|Sensor or cable may be damaged||return for repair|
|measurement accurately reflects reality||none|
|pipe is empty||none (turn off flowmeter)|
|sensor cable has been detached||re-attach cable (turn power off first !)|
The meter reads low or high compared to another source of information
(other instrument, pump curve, etc.)
|The comparison meter is not set to the same range||When comparing two instruments make sure they are both using the same measurement range (scale).|
|The other instrument is not properly calibrated||The tendency is to believe the old measurement rather then the new. If all is set up correctly you should assume that the Magnum gives you correct information.|
|Pumps do not always deliver the specified capacity||Magnum is correct|
|Doubling the number of pumps does not double the flow||Magnum is correct|
|The pipe is not completely filled||Magnum is showing more flow then really present because it assumes a filled pipe. Move the meter to a different location.|
The meter shows zero when there is flow
|Sensor orientation is off||point arrow on top end of sensor in flow dirction.|
|Sensor, cable, or transmitter damaged||return for repair|
The display stays blank or shows only partial caracters
|Display has been damaged||return for repair|
4-20mA output seems incorrect
|Using external power source to drive 4-20mA circuit||Magnum has a self powered 4-20mA output. Do not use an
external power source.
|Filter and/or window has been set too high||Reduce filter and/or window size|
- attach the sensor cable to the transmitter while it is powered
- cut or modify the sensor cable. It is part of the calibration.
- submerge the transmitter.
- expose the connector end of the sensor cable to moisture.
- remove the snap-ring from the universal mounting mechanism unless the tap valve is securely closed.
- expose the cable or sensor to temperatures above 100 C unless they are part of the High Temperture model.