2 photometry, Photometry – YSI pHotoFlex STD Colorimeter User Manual
Page 66
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What to do if...
pHotoFlex
®
STD
66
ba76122e01
02/2013
6.2
Photometry
Measuring range
undercut or exceeded
Obviously incorrect
measured values
Cause
Remedy
– Program not suitable
– Select program with suitable
measuring range
– Dilute the sample
Cause
Remedy
– Measurement disturbed by
external light
– Close the external light cover.
– Cell not correctly inserted
– Insert the cell so that it is
positioned on the bottom of
the cell shaft.
– Cell contaminated
– Clean the cell
– Cell shaft contaminated
– Clean the cell shaft
– Dilution set incorrectly
– Set the dilution
– Selected program unsuitable
– Select other program
– Zero measurement incorrect
– Perform zero measurement
– Blank value incorrect
– Remeasure the blank value
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