Xylem SI Analytics Lab 855 - Error Message OFL, UFL; Orp; No Stable Measured Value

Lab 855 What to do if...
ba77143e02 12/2017 37
10.1.3 Error message OFL, UFL
The measured value is outside the measuring range.
The measured value is obviously incorrect.
10.2 ORP
10.2.1 No stable measured value
Cause Remedy
• The used buffer solutions do not
agree with the set buffer set
• Set different buffer set
or
• Use different buffer solutions
• Buffer solutions too old • Use only once.
Note the shelf life
• Buffer solutions depleted • Change solutions
Cause Remedy
• Cable broken • Replace the electrode
• Gel electrolyte dried out • Replace the electrode
• Air bubble in front of the junction • Remove the air bubble
• Air in the junction • Extract air or moisten the junction
More information and instructions on cleaning and exchange of
sensors are given in the documentation of your sensor.
Cause Remedy
• Junction contaminated • Clean the junction
• Pt-ORP electrode contaminated • Clean the Pt-ORP electrode
Cause Remedy
• ORP value not stable • Measure with air excluded if neces-
sary
• Temperature not stable • Adjust temperature if necessary