Information About Sensor Do; Sensing Element; Membrane; Electrolyte - VIO OXY 7 Manual De Instrucciones

P5.8 Reset of the DO parameter (Reset Settings)
If the instrument does not work properly or incorrect calibrations have been carried out, confirm YES with
button , in order to take all the parameters of the DO menu back to the default settings.
P5.9 Temperature calibration
All the instruments of this series are pre-calibrated for a correct temperature reading. However, if there is a
difference between the measured and the real temperature (usually due to a probe malfunction), it is
possible to perform an offset adjustment of + 5°C.
After the connection of the temperature probe, use the keys
offset value and confirm with
 Information about sensor DO 7
The probe DO7 is polarographic with integrated temperature sensor. The oxygen sensor uses a BNC
connector, while the temperature sensor uses an RCA (Chinch) connector.
Membrane cap
 Sensing element
The permeable membrane allows the passage of only gas present in the sample to be analysed, blocking
the passage of liquids. The oxygen reacts with the electrolytic solution, after passing through the membrane,
and changes its chemical and physical properties depending on oxygen concentration. The sensing elements
detect this change and generate a signal depending on the amount of dissolved oxygen. The oximeter reads
this signal and returns the value on the display.
 Membrane
The membrane, which must allow only passage of oxygen, must be in perfect conditions.
If it presents any ripples, irregularities or is punctured, it must be replaced with a new one.
 Electrolyte
The electrolyte is an alkaline solution that reacts to the presence of oxygen, it saturates with wear and over
time, therefore, it must be replaced regularly.
 Polarization time
The polarographic sensor needs to be polarized before performing the measurements.
Connect the probe to the instrument and switch on with button
countdown for the polarization time. At the end of the countdown, the meter enters in measure mode
and it is ready to perform measurements. The polarization time is 10 minutes. However, if the
instrument is turned off for less than an hour, the polarization time will reduce proportionally.
 New sensor with new instrument
The sensor is supplied with the membrane filled with electrolyte; it is necessary to hydrate the membrane
dipping it in distilled water for half an hour. Switch the device on and wait for the polarization time.
UM Serie Oxy7Vio EN rev.0 28.05.2020
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Integrate temperature sensor
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and to correct the temperature
; the device turns on and starts the
EN