wtw TetraCon 700 SW, Operating Manual

Page: 14 / 19

What to do if... TetraCon
®
700 SW
32 ba75538e01 04/2005
6 What to do if...
Measurement delivers
no or wrong measured
values
Measurement provides
implausible measured
values
Cause Remedy
– Conductivity measuring cell not
correctly connected
– Check connection to
measuring transmitter
– Cable damaged – Check cable. If it is defective,
send conductivity measuring
cell to WTW
– Measuring range exceeded – Select larger measuring
range or set automatic selec-
tion of the measuring range
Cause Remedy
– Conductivity measuring cell is
heavily contaminated
– Clean the conductivity
measuring cell
– Boundary field not maintained – The conductivity measuring
cell must be surrounded by a
gap of at least 5 cm at the
base and sides when
measuring at the electrodes.
Otherwise, the cell constant
will change (see section
4.1 M
EASURING
)
– Electrodes damaged – Send the measuring cell to
WTW
– System setting incorrect – Correct the system setting
– Measuring range exceeded – Make sure the correct sensor
is being used for the
application
– The measuring cell was
installed in a flow-thru device
and the boundary field is not
sufficient
– Set the cell constant to the
value of the installed state (if
known)
– If the cell constant of the
measuring cell in the installed
state is not known, adjust the
measured value to the
nominal value of a measuring
solution (see operating
manual of the measuring
transmitter)