wtw Multi 3620 IDS User Manual

Multi 3620 IDS Dissolved oxygen
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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.
7.1.2 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.
7.2 FDO
®
check procedure (check of the FDO
®
925)
7.2.1 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.
7.2.2 When should you check the sensor?
Checking can be useful in the following cases:
 When the check interval has expired
 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
3 Using <ENTER>, start a further measurement with Stability control.
or
Release the frozen measured value again with <AR>.
The display switches to the measured value display.
The [AR][HOLD] status display disappears.
Measured
parameter
Time interval Stability in the time inter-
val
D.O. concentra-
tion
20 seconds
∆ : better than 0.03 mg/l
D.O. saturation 20 seconds
∆ : better than 0.4 %
D.O. partial
pressure
20 seconds
∆ : Better than 0.8 mbar
Temperature 15 seconds
∆ : better than 0.5 °C

wtw Multi 3620 IDS Specifications

General

Brand	wtw
Model	Multi 3620 IDS
Category	Measuring Instruments
Language	English