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There are three categories of possible faults. The malfunction
of the instrument, loss of echo, and wrong reading.
The biggest problem is to identify the malfunction. If the
instrument is not working satisfactorily then remove the transmitter
and transducer to the workshop. Connect the power and the
transducer directly, not using any extension cable. Aim the
transducer to a wall about 1.5m meters away, making sure that
it is perpendicular to the wall. Now reset the instrument
by the Factory Reset prompt. The Instrument should now read
Distance 1.50 m. If it does not read the above then there
is a malfunction with the instrument and
it should be returned for repair.
If the above works and it still does not work in the field
then there are many possible problems. A list of possible
problems follow.
Loss of echo.
Check all cable connections and that the joints are soldered
together.
Use only RG62U co-axial.
Check the specification of the transducers as agitated surfaces
and solids do not reflect as powerful a signal as flat surfaces.
Aim the transducer straight down.
Check if the Transducer face is dirty.
Wrong reading, always reading close
to Transducer.
Check to see if the isolation kit has been used correctly
and is only hand tight.
Do not reduce blanking distance below 0.5 m unless consultation
has been made with EESIFLOs.
Electrical noise can cause this error. Remove noise.
Wrong reading, anywhere in weir/channel.
Check to see if there is a reflection from the wall.
Please Note! A piece of wire across a tank can cause a big
enough echo to be accepted.
Are the parameters correct? Reset to factory default and check
that EASZ-11 reads correctly. If the factory settings are
OK then your parameters need to be changed. Re-check these
parameters with a tape measure.
Wrong reading, erratic.
Reduce Rate of Change. Not many levels move faster than 1
meter / minute.
Wrong reading, slow.
Increase Rate of Change.
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