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ChannelMag
Section 4 Maintenance
4.6 Transmitter Fault
4.7 All Checks Good,
But No Signal
4.8 Erratic Signal
4.9 Signal Or Indication
“Swing”
Should the resistances referenced above be correct, but the zero and span cannot be achieved, then
the fault lies with the transmitter.
Check wiring in transmitter terminals in accordance with the transmitter instructions. Make sure
there is actually flow through the channel.
Check the following:
a) Make sure the ChannelMag sensor is fully covered with media.
b) Check Paragraphs 4.1.4 to 4.1.6
c) Check if the ChannelMag sensor is correctly grounded (see Section 2.5)
d) Check for loose wiring.
e) Make sure cables are not too long. For multiple ChannelMag systems make sure electrode
cables are separated from other cables (see Section 2.7)
f) The ChannelMag has high insensitivity to radios and variable frequency drives. If these are
in close proximity to the transmitter or sensor then cable lengths should be kept to an
absolute minimum.
Check the following:
a) Make sure there is enough straight length of channel (see Section 2.3). If the requisite
straight lengths are not available, then the “damping” in the transmitter must be maximized
(see transmitter Instruction Manual).
b) Make sure there are no flow pipes or channels entering the channel in the location of the
ChannelMag sensor .
c) Make sure there is no debris or loose cables in the vicinity of the electrodes.