EUTECH INSTRUMENTS TURBIDIMETER TN-100 WATERPROOF PORTABLE METER Manual de Instruções descarregar pdf (Página 26)

Instruction Manual TN-100/ T-100

Degassing is recommended even if no bubbles are visible. There are three

methods commonly used for degassing:

 Addition of a surfactant: This involves adding a surfactant to the

water samples to lower the surface tension of the water, thereby

releasing trapped gasses.

 Application of a partial vacuum: Partial vacuum can be created

by using simple syringe or vacuum pump. (This is only

recommended for ultra-low turbidity measurement).

 Use of an ultrasonic bath: This may be effective in severe

conditions or in viscous samples, but not recommended for

ultra-low measurements.

Each of the method above has its own advantages and disadvantages.

For instance, under certain sample conditions, the use of vacuum pump or

ultrasonic bath may actually increase the presence of gas bubbles.

9.4

Timeliness of Sample

Samples should be measured immediately to prevent changes in particle

characteristics due to temperature and settling. Temperature can affect

particles by changing their behavior or creating new particles if precipitates

are formed. Dilution water may dissolve particles or change their

characteristics. It is recommended to take samples only when the

turbidimeter is ready to be operated. Samples should not be drawn and

allowed to sit while the instrument warms up or is being readied.

9.5

Other Important Sampling Techniques

1. Samples should not be violently shaken or agitated as particles can be

broken apart or air may be entrapped into the fluid. Gentle agitation

such as swirling the sample vial is advisable to reduce particle settling.

2. Sample vials should be used only with the instruments for which they

were intended. Do not mix and match.

3. Perform a visual observation of the sample vial every time a

measurement is made. Ensure that there are no visible bubbles in the

sample and the vial is clean and free of scratches.

4. Samples entering the turbidimeter should be at the same temperature

as the process flow samples. Changes in temperature can cause

precipitation of soluble compounds and affect readings.

5. Sample vials should be evaluated with a low turbidity water (after

cleaning) to determine if cells remain matched. If the evaluation

determines that a cell is corrupted, discard the vial. It is recommended

to conduct this evaluation weekly.

6. When in doubt or question about whether a sample vial is too

scratched or stained, throw it away.

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