Filter
Top Products
Reference Manual
IP2013, Rev BA
February 2012
Mobrey MSP422
5-2
SERVICING The only maintenance required is to occasionally check the transmitter face to
ensure it remains clean and check that the cover seal, wiring, and cable
glands are in good condition.
There are no spare parts for the Mobrey MSP422. If a problem persists,
contact Mobrey Measurement for advice.
DIAGNOSTICS FOR
THE MSP422
General
Troubleshooting
No Display
Check the power supply. Ensure there is a minimum of 12 Vdc at the
instrument terminals. Check that the cable insulation is not preventing contact
at the terminal block.
No Level Reading
Check that the instrument is ticking about once per second. If there is no
ticking, the instrument should be replaced.
Error Messages Flashing “LE” With “0000”
The transmitter is not receiving a return echo, which could mean the liquid
surface is poor or that it is beyond the range of 26 ft. (8 m) of the instrument.
Change the position of the transmitter or contact Mobrey Measurement for
information on longer range instruments
This means that the transmitter is not receiving a return echo, possibly
because the liquid surface is poor or beyond the range (26 ft./8 m) of the
instrument. Re-locate the instrument or contact Mobrey Measurement for
details of longer range instruments.
Flashing “LE” With Level Reading
This means that the transmitter is no longer receiving satisfactory echoes
from the liquid surface. This may be because of one of a variety of reasons,
for example, excessive foaming, turbulence, or ullage vapors.
First, check that the transmitter face is free from contamination and
condensation. The transmitter will operate with some condensation on the
face, but excessive condensation may cause operational problems. If the
vessel cannot be adequately vented to prevent condensation forming, contact
Mobrey Measurement for alternative solutions.
Second, check that the instrument is still vertically aligned above the liquid
surface and check the echo received size. If the echo size is small (<3),
re-position the transmitter or modify the vessel for the transmitter to operate
above a more acceptable area of the liquid surface.
Lost echo (LE) is signalled when there has been no return echo for 10
seconds. Within the 10 seconds, the output will remain fixed. If, after the 10
seconds, no satisfactory has been received, the output will increase to the
current selected level and the display flashes alternately “LE” and the last
valid level reading.
If a satisfactory echo is received within the 10 seconds, a new output is
established and the LE timer is re-set.