Water Pollution Continuous Monitoring Technology in Japan
Maintenance of Analyzers for Water Pollution Continuous Monitoring

2. Automatic Analyzers for Water Pollution Monitoring Station

2.11 Water Temperature Meter

b. Remove the contaminants on the electrode with wet paper, etc.. If the contaminant is hard to remove, clean with polishing powder and/or sand paper.

(2) Calibration
-Zero calibration: False resistor of the maximum range of 0%

-Span calibration: Set the water thermometer to the normal measurement condition and calibrate based on the value read by a glass-stick type reference mercury thermometer (50 degreeC) .

Follow the calibration procedure described in "b" of Section 2.2 (2).

-If the span calibration under normal measurement condition is difficult due to the significant fluctuation of momentary water quality (e. g. tidal rivers), put sample water into a proper container and calibrate the thermometer by placing the detector and a glass-stick type reference mercury thermometer (50 degreeC) into the water.

(3) Cross check with the values measured by manual analysis
Measure the water temperature with the glass-stick type reference mercury thermometer and compare the data in the same manner as that for span calibration.