Xylem WTW TriOxmatic 690 Operating Manual page 12

Dissolved oxygen sensor
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Measuring / Operation
Measured values
outside the required
precision
12
Required precision
Measured value in air:
 No cleaning or recalibration is necessary as the measurement error
lies within the range of precision required by the user.
If the measured value lies outside the range of precision required by the
user, clean the sensor shaft and membrane (see section 5.2) and
calibrate the sensor (see section 4.2).
In the case of air temperatures under 5 °C do not perform
the function check in air but in air-saturated water that has
a higher temperature. You obtain air-saturated water by
pouring water several times in and out of two vessels so
that it sparkles.
Then submerse the sensor in a vessel with air-saturated
water and perform the function check as described above.
5 %
97 % saturation (nominal value: 100%)
®
TriOxmatic
690
ba25314e05
09/2020

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