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2.3 Operation mode
2.3.1 Automatic switch off
The instrument switches off automatically after 20 minutes. This is indicated 30 seconds before
by a beeper. Press any key to avoid the instrument switching off. As long as the instrument is
working (for example countdown or printing) the automatic switch off is inactive.
2.3.2 Turbidity measurement
2.3.2.1 Read/ Avg key - measurement with Signal Average
Read
Avg
By pressing the [Read/Avg] key Signal Average function is active. Signal averaging
measures and averages 45 measurements. The signal averaging feature provides com-
pensation for fluctuations caused by random drifting particles in the sample.
The result is shown in NTU.
2.3.2.2 Read key – quick measurement
Read
By pressing the [Read] key Signal averaging function is not active. The TB300 IR measures
and averages 9 measurements.
The result is shown in NTU
2.3.2.3 Performing Turbidity measurement
Accurate turbidity measurements depend on good, consistent measurement techniques.
This includes working with clean sample vials in good condition and removing air bubbles.
Samples should be measured immediately to prevent changes in sample characteristics due
to temperature shifts and settling.
Instrument operation:
1. Take a representative sample in a clean container.
2. Fill a clean and dry vial with the water sample up to the mark (approx. 12 ml).
3. Cap the vial.
4. Take care to handle the vial by the top. Wipe the vial with the supplied cleaning tissue to
remove waterdrops and finger prints.
5. Switch the instrument on.
6. Place the vial in the sample chamber making sure that the positioning is correct, with the
marks aligned and close the sample chamber with the cap.
7. Press [Read / Avg] or [Read] key.
8. The result is shown in the display in NTU.
TB300 IR 6 03/2022
Press [Read/Avg] key to perform a test with signal average
function.
Press [Read] key to perform a quick test.
*
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