User manual |
Orbit 3100/3300/3500/3400/3600 Camera
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If the depth does not go down using the Allen key, you must remove the cover and reapply the
membrane.
2. If the bracket
or some other parts of the camera have been mechanically damaged, the
camera must be sent for repair. If the camera starts to flicker, and this only happens when it is
deep in the cage, the electric connection between the camera halves has been mechanically
destroyed. This happens by careless handling onshore and that the camera has been bumped
hard against the ground with lopsided strain on camera halves.
3. If the camera has an oxygen sensor, the calibration can be checked approximately by +/- 5%
error margin by raising the camera up above the water surface. The camera will show near
100% saturation after 5 minutes. If the camera shows significantly below 95% or much more
than 105% the sensor must be sent for calibration. The sensor shows higher oxygen
saturation if the camera is above the water surface for a long period. This is because the
sensor is heated up without access to water-cooling, and because of this uses incorrect
temperature to calculate the oxygen percentage.
6.4
Procedure for cleaning of oxygen sensor on Orbit-3500 and Orbit-3600
From the service instructions on sensors from suppliers Aanderaa/Xylem:
Interval for cleaning:
This depends on fouling conditions at site. The sensor will measure oxygen levels in front of
the measuring film. If fouling is preventing the water from penetrating through to the surface of
the film, cleaning is necessary. If fouling is in the form of algae or organisms that produce or
consume oxygen, this can affect the measurement and cleaning would be required. A lot of
fouling on the film can also influence the response time of the measurement. Therefore, the
sensor should be cleaned regularly depending on fouling conditions at the location. We
recommend cleaning BEFORE the sensor is stored in air over a longer period (e.g. sent to
service).
Use a toothbrush or another soft brush to clean the film.
The sensor housing can be cleaned using a soft brush and clean water. Use a medium hard
toothbrush or Q-tip to clean the film itself. Fouling consisting of calcareous organisms can be
removed by immersing the sensor, or brush it with a toothbrush dipped in a weak vinegar
solution. Recommended solution is 1 part fresh water and 1 part 7% clear vinegar. Rinse with
(sea) water to neutralize the acid afterwards. If cleaning is performed immediately after the
sensor is taken out of the water is not normally necessary to use vinegar solution.
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The pictures numbered 1 – 3 shows cleaning of the Orbit-3500 oxygen sensor, while the
pictures numbered 4 - 5 shows the oxygen sensor on Orbit-3600.
Picture 10: Orbit-3500 oxygen sensor
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