Dissolved oxygen
Oxi 3310 IDS (Oxi 3315)
26
ba75944e02
10/2014
Criteria for a stable
measured value
The
Stability control
function checks whether the measured values are stable
within the monitored time interval.
The minimum duration until a measured value is assessed as stable is the mon-
itored time interval. The actual duration is mostly longer.
5.1.2 Measuring the temperature
For reproducible D.O. measurements, it is essential to measure the tempera-
ture of the test sample.
IDS D.O. sensors measure the temperature with a temperature sensor inte-
grated in the IDS sensor.
5.2
FDO
®
check procedure
5.2.1 Why should you check the sensor?
With the FDO ® Check procedure, you can find out in a simple manner
whether the FDO ® 925 D.O. sensor should be cleaned or calibrated.
5.2.2 When should you check the sensor?
Checking can be useful in the following cases:
When the check interval has expired
(the [check] status indicator is displayed).
If the measured values seem to be implausible
If you assume that the sensor cap is contaminated or at the end of
its lifetime
After the sensor cap was exchanged
Routinely within the framework of the company quality assurance
3.
Using
<ENTER>
, start a further measurement with stability control.
or
Release the frozen measured value again with
<AR>
or
<M>
.
The [AR] status display disappears. The display switches back to the
previous indication.
Measured parameter
Time interval
Stability in the time
interval
D.O. concentration
20 seconds
∆
: better than 0.03 mg/l
Oxygen saturation
20 seconds
∆
: better than 0.4 %
Oxygen partial pressure
20 seconds
∆
: Better than 0.8 mbar
Temperature
20 seconds
∆
: better than 0.5 °C
