Probe Storage; Not Using The Sensor For Long Period Of Time: Over One Month; Oxygen Sensor Calibration; Calibration In Air At 100 - VIO OXY 7 Manual De Instrucciones

 Probe storage
When the probe is not in use, store it in the storage cap containing distilled water. In this way, the
membrane is protected and hydrated, ready for use.
 Not using the sensor for long period of time: over one month
If the instrument and the sensor are not used for a long period of time (over one month), it is recommended
to empty the membrane from the electrolyte and wash the probe accurately. Dry the sensor and screw the
membrane without electrolyte, protecting the sensor with its rubber cap.
 Oxygen sensor calibration
The polarographic sensor is an active sensor which changes its response with wear and aging; therefore,
it is necessary to perform the calibration regularly in air.
 Calibration in air at 100%
The ordinary calibration is performed at 100% in air.
Turn the instrument on, dip the probe in water and wait for the polarization time of 10 minutes.
Later, dry the probe thoroughly with paper towel and proceed as follows:
Place the probe in air with the membrane facing downwards and wait for 2 minutes. Then, connect the

sensor to the device.
 In measure mode, press the key
On the display, it appears the string "POINT oxy 100.0"; the device will look for the value %O
Keep the sensor in air in a vertical position with the membrane facing downwards.
 When the signal is stable, the red bands will be replaced by the stability icon
Press the button
On the display, the measured value flashes, then the sensor and finally the beacker
below on the left and indicates that the instrument is calibrated on value 100%O
 After the calibration, the instrument enters in measure mode automatically.
 Calibration with Zero Oxygen Standard
Normally, it is enough to calibrate the instrument in air at 100%, as explained previously. However,
sometimes it is also necessary to calibrate at 0%, for example when:
 A probe is replaced by a new one.
 The probe is not used for a long period of time (over one month).
 A complete maintenance of the sensor is performed.
The instrument does not calibrate at 100%, in this case calibrate it before at 0%.

The instrument does not measure correctly.

For calibration at 0%, proceed as follows:
Before proceeding, perform a maintenance of the probe DO 7. (chapter 11)
Turn the instrument on, dip the probe in the water and wait for the polarization time of 10 minutes. Then,
dry the probe thoroughly with paper towel and proceed as follows:
 Put the probe in the Standard Zero Oxygen and wait for 5 minutes.
In measure mode, press the button

the button again.
Press the button

UM Serie Oxy7Vio EN rev.0 28.05.2020
to enter in calibration mode.
, as indicated by the string "PRESS OK".
, remain in Menu DO SETTINGS P5.0 and confirm pressing
again, confirm the entry into submenu CAL 0 P5.1.
15
= 100 %.
2
.
appears
.
2
EN