YSI NiCaVis 705 IQ User Manual
Page 46
What to do if...
NiCaVis 705 IQ
7 - 2
ba75950e01
03/2013
Drifting measured values
Display of
OFL
Measured values
fluctuating heavily
Cause
Remedy
– Cleaning efficiency too low -
measurement windows
becoming more and more
contaminated
– Clean the measurement win-
dows (section 5.2.4)
– Use other cleaning method
– Select different measurement
location
– Set longer cleaning duration
– Set more frequent cleaning
procedures
– Install optional compressed air
cleaning device
– Failure of the optional com-
pressed air cleaning system
– Clean the measurement win-
dows (section 5.2.4)
– Check all components of the
compressed air cleaning sys-
tem (compressor, compressed
air line, UV/VIS sensor, rinsing
openings)
– Substantial change of test
sample (sample matrix)
– Carry out new user calibration
Cause
Remedy
– Measuring range exceeded
– Check process
– Foreign matter in the measur-
ing gap
– Clean the measuring gap (sec-
– Erroneous user calibration
– Repeat user calibration. Make
sure the samples for compari-
son are representative.
Cause
Remedy
– Gas bubbles in front of the
measurement windows
– Check the position within the
process and the installation
position