Symptom:
The reading seems erratic
Possible Cause:
Remedy:
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 |
DO NOT:
- attach the sensor cable to the transmitter while it is powered
up.
- 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.