Endress+Hauser Viomax CAS51D, Operating Instructions Manual

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Device description Viomax CAS51D
10 Hauser
The ratio to SAC (based on KHP) is calculated as follows:
1/m = 1.487 mg/l COD = 1.487 mg/l BOD = 0.595 mg/l TOC = 0.595 mg/l DOC
Many components that absorb light at 254 nm deviate significantly from KHP in terms of
their absorption behavior. For this reason, an adjustment to the customer process is
worthwhile.
3.3.5 Cross-interference when measuring SAC
The following have a direct impact on the measuring range:
• COD
• Color
Trends:
• Oxidizable substances, absorbing at 550 nm, distort the measurement result. In
instances of this nature, a comparison or calibration is necessary.
• Coloration that absorbs in the green spectral range increases the measured value.
• Oxidizable substances with different spectral properties to KHP (potassium hydrogen
phthalate) distort the measurement result. In instances of this nature, a comparison or
adjustment is necessary.