6
OXY 7
3) When the reading is stable and appears
icon, press the
button to confirm, the display
shows
End
and the meter enters in measurement mode.
Perform also the
Calibration in air at 100%
. The calibration remains in memory even after the instrument
is turned off.
3.3 Calibration interval
The time interval between two calibrations (100% in air) depends on the type of sample, the efficiency of
the electrode and the accuracy sought, it is usually necessary to calibrate the meter at least once a week,
for greater accuracy calibrate the instrument more frequently.
You must recalibrate the instrument if occurs one of the following conditions:
You change the probe with a new one
The probe is not used for a long time
After the sensor maintenance
4. Dissolved oxygen measurement
4.1 Before starting
In order to reduce measurement errors and achieve the greatest possible accuracy, observe the following
rules before you begin:
The sensor must be calibrated
The sensor must be vertical with the membrane downwards
Remove the protective cap
The sensor must be at the same temperature of the sample to be analysed, if necessary leave the
probe immersed in the sample until the thermal equilibrium is reached
4.2 Methods of measurement
This instrument can work in two measurement modes:
Dissolved O
2
Saturation
expressed in %
Dissolved O
2
Concentration
expressed in mg/L, equivalent of ppm
mg/L = ppm
During measurement press
key to change measuring method.
If the
key is pressed when the reading is not stabilized yet,
Er2
will appear on the display.
Note:
