Model WQC-30 6.2 Calibration of Turbidity
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(3) Span Calibration of Turbidity
(a) Usually, the completion of one-touch zero calibration may be continuously followed by a
turbidity measurement. However, if a measured value shows discrepancy or if the obtained
value needs to be made compatible with a value from other method, perform span calibration in
addition to the one-touch zero calibration.
(b) Use a turbidity measurement unit suited for the type of the standard solution you use. >> “7.6
(1) Change of Unit of Turbidity”
When formazin standard solution is used ……Turbidity unit is “NTU” (default)
When kaolin standard solution is used ……Turbidity unit is “mg/L”
(c) The span calibration must follow the completion of the zero calibration whose data are kept
undeleted.
① Prepare a standard solution…… >> “6.2 (4) Preparation of Formazin Standard
Solution” or “6.2 (5) Preparation of Kaolin Standard Solution”
② Clean light receiving and emitting parts……Remove the sensor module
protective cylinder, clean the light receiving and emitting parts of the turbidity and electrical
conductivity cell with pure water, and gently wipe them with paper wiper or similar.
【
IMPORTANT
】
•
When the protective cylinder is removed, carefully handle the
electrode parts to prevent them from contacting with and being
damaged by others.
Cylinder electrical
conductivity cell
Light
emitting part
Light receiving part
Turbidity sensor
Wash bottle with
nozzle
Pure
water
Protective
cylinder
Remove
Cleaning the light receiving and emitting parts
③ Attaching the cylinder
……Re-attach the sensor module protective cylinder as it was
before.
【
IMPORTANT
】
•
Be sure to attach the protective cylinder. If the cylinder is removed,
proper calibration cannot be performed.
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