JUMO AQUIS 500 RS, Operating Manual, Page: 63 / 120

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8 Calibrating sensors
8.1 JUMO ecoLine O-DO (type 202613)
8.1.1 General information
As with all optical sensors, the JUMO ecoLine O-DO is subject to sensor aging
and sensor drift during operation. The effects of these factors are compen-
sated for by calibration.
Calibration methods
The JUMO AQUIS 500 RS provides two calibration methods for the JUMO
ecoLine O-DO sensor:
• End value calibration (typical method), in which the slope of the sensor is
calibrated, see chapter 8.1.2 "End value calibration", page 64.
• Two-point calibration, in which the zero point and slope of the sensor are
calibrated, see chapter 8.1.3 "Two-point calibration", page 66. This calibra-
tion method offers the greatest possible level of accuracy and is particularly
recommended for measurements of small oxygen concentrations.
Calibration interval
The JUMO ecoLine O-DO sensor is calibrated ex works, meaning that no cali-
bration is required before initial startup. During operation, the sensor should
be calibrated at least once a year and should also be cleaned regularly
(depending on the extent of contamination by the process medium).
Preparatory work
• Rinse the sensor and membrane with clear water.
• Carefully remove biofilm or sludge with a soft sponge and warm, soapy
water.
Never use abrasive agents (e.g. a scouring sponge)!
Calibration can basically be initiated as follows:
• Press the key if this has been enabled in
ADMINISTR: LEVEL > PASSWORD > CALIB. ENABLE
• Via ADMINISTR: LEVEL > PASSWORD > CALIB. LEVEL
• Via CALIB. LEVEL in the main menu, if this has been enabled in
ADMINISTR. LEVEL > PASSWORD > CALIB. ENABLE
NOTE
When starting the calibration, the device sets the analog outputs, switching
outputs and controllers to the following states by default:
• "Moving" (analog outputs)
• "Inactive" (switching outputs)
• "HOLD mode", output level frozen (controller)