Electro-Chemical Devices (ECD) T80 - Manual (Page 60)

Cleaning the Sensor
The fluorescence cap of the Triton DO80 sensor must be clean to ensure an accurate measurement. The
measurement will degrade as the fluorescence cap gets coated. Build-up of material on the cap will increase the
response time and decrease the slope. The sensor should be cleaned on a regular basis and before every
calibration.
*** Do Not Scrub the Sensing Portion of the Cap with any abrasive material, use only a soft sponge or cloth
and water to clean the tip***
The cleaning method depends on the nature of the coating. For insoluble mineral or salt deposits, the sensor
should be soaked in a 1-5 % solution of HCl, hydrochloric acid, for no more than 10 minutes. After this acid
treatment rinse the sensor with copious amounts of tap water and then allow it to soak in the tap water for at
least 5 minutes before evaluating the performance. Repeat if necessary.
For biological films or dirt, rinse the tip with tap water and gently wipe the sensing surface with a soft sponge or
cloth.
Cleaning Internal Optics
The internal optical surface should only need cleaning if the Fluorescence Cap is broken or defective. The
following steps should be followed in the case of a leaking cap.
1. Unscrew the protective guard and the fluorescence cap from the sensor head.
2. Carefully clean the optical surface with a soft cloth and water until the buildup is fully removed.
3. Use only drinking or distilled water to clean the optics, do not scratch the optical surface.
4. Dry the optics with a soft lint free cloth and screw on a new fluorescence cap.
8.3.8.1 Replacing the Fluorescent Cap
The Fluorescence Cap (P/N 2500207) can provide up to two years service, if damaged or when it expires, it is
easily replaced.
Removing the Old Fluorescence Cap
• Remove the sensor from the medium.
• Unscrew the protection guard.
• Clean the outside of the sensor.
• Unscrew the fluorescence cap.
• Clean and dry the optical surface if necessary.
Installing the New Fluorescence Cap
• Make sure that there are no dirt particles on the sealing surface.
• Visually inspect the sealing o-ring, replace if necessary. (P/N 1000225)
• Carefully screw the fluorescence cap onto the sensor head until the stop.
• Screw the protection guard back on.
*** After replacing the Fluorescence Cap the sensor must be calibrated. ***
Page 59 Model T80