EUTECH INSTRUMENTS TURBIDIMETER TN-100 WATERPROOF PORTABLE METER Manuál s instrukcemi stáhnout pdf (Strana 4)

3. Press ▲ or ▼ to select:

4 CALIBRATION

a. [YES] = Restores meter back to factory calibration values

b. [No] = Retains last calibrated values

4.1 Important Information on Meter Calibration

4. Press READ/ENTER to select [YES] or [No]. Display flashes [--Rd--] 10 times followed by [--Rd--].

The meter was calibrated and tested prior to leaving the factory. It is possible to use the instrument

directly. Re-calibration is recommended at least once every month using all 4 standards provided to

ensure full-range accuracy.

5. It is now ready to take turbidity measurements.

5 MEASUREMENT

¾ Do not open the vials with calibration standards.

¾ Check that the standards have not expired.

¾ NEVER pour liquid directly into the sample well. Always use a vial.

¾ Make sure the calibration vials are free of dust, smudges and scratches.

¾ Measurements are only accurate when vials are sealed with the black caps.

¾ Conduct calibration in the same manner each time. Variations could result in inaccurate

measurements.

¾ NEVER clean the sample well. Optics may damage.

¾ Readings > 1000 NTU are outside the range.

¾ Before switching on the meter, a sample calibration vial MUST be in the sample well.

4.2 Calibration Sandards

¾ The light shield cap could be used to cover the vial during measurements.

Use the following materials during calibration to achieve the accuracy stated in this manual:

¾ Samples should be measured immediately to prevent changes in particle characteristics due to

temperature and settling.

 CAL 1: 800 NTU Calibration Standard

 CAL 2: 100 NTU Calibration Standard

¾ Samples should not be allowed to sit while the instrument warms up or is being readied.

 CAL 3: 20.0 NTU Calibration Standard

¾ After a measurement is completed, a 4-second recovery time occurs before the meter can

perform another function. If any key is pressed during the recovery time, the meter will perform

the corresponding action at the end of the period.

 CAL 4: 0.02 NTU Calibration Standard

Next to the above solutions you can use diluted Formazin. When choosing Formazin to calibrate,

ensure that the stock suspension of Formazin is fresh to achieve the accuracy quoted for the

instrument. Calibration standards offered are more stable than Formazin, with a shelf

The expiration date is indicated on cap label.

4.3 Calibration Procedure

life of 12 months.

ill blink

Place the meter on a flat and level surface. DO NOT

hold it on hands.

1. Press CAL. [CAL] will blink, the meter will prompt

for the first standard CAL1 (800NTU).

2. Place the CAL1 vial inside the meter. Align the

vial’s ▼ mark with the meter’s ▲ mark.

3. Push the vial until it is fully snapped in.

. 4. Cover the vial using the light shield cap

5. Press READ/ENTER. [CAL1 800 NTU] w

for 12 seconds.

a. After calibrating this point, there are 3

options: Insert vial CAL2 (100NTU)

standard in the meter to continue

calibration

b. Press CAL to abort (calibrated point(s) will be stored)

c. Press ▲ or ▼ to skip a calibration point and move to the next calibration point.

6. Repeat the calibration sequence for each calibration standard.

7. After calibrating all required points, the display shows [STbY].

8. The meter is now ready to perform next measurement.

Note: Press CAL to exit the calibration mode at the end of any step. Only calibrated values prior to

exiting will be accepted.

Note: After calibration of one point, it will auto select the next point and exit calibration mode

automatically after the fourth calibration point.

Note: If an error occurs, the display shows an error message. The meter will abort calibration and

return to the measurement mode without saving the last calibration value.

Note: When there are errors in calibration or when you have new calibration standards it is advisable to

restore the Factory Calibration.

4.4 Restoring Factory Calibration

1. Switch OFF the meter

2. Press ▲ and ON/OFF simultaneously for 2 seconds. Display flashes [URST] for 2 seconds and

show [No].

5.1 Preparation of Sample Vial

1. Obtain a clean and dry vial. Handle the vial by the top.

2. Rinse the vial with 10 ml of the sample.

3. Cap the vial with the screw cap. Gently invert it several times.

4. Discard the used sample and rinse two more times.

5. Fill vial with the sample up to the mark indicated in the vial.

6. Cap the vial finger tight

7. Wipe the vial with a soft, lint-free cloth. Ensure that the outside of the vial is dry, clean and free from

smudges.

8. Apply a thin film of silicone oil (supplied) on the sample vial.

9. Wipe with a soft cloth to obtain an even distribution over the entire vial’s surface.

5.2 Taking Measurements

1. Place the meter on a flat, level surface, DO NOT

hold it on hands!

2. Follow the procedure as mentioned at “Preparation

of Sample Vial”.

3. Place the sample vial inside the meter. Align the

vial’s ▼ mark with the meter’s ▲ mark.

4. Push the vial until it is fully snapped in.

5. Cover the vial with the light shield cap.

6. Press ON/OFF to turn the meter on. Display blinks

[--Rd--] for 12 seconds.

7. The value of the sample will appear

8. Repeat steps 2 to 5 for further measurements.

9. Press READ/ENTER.

5.3 Indexing a vial / continuous measurement

Due to the high quality of the glass, indexing is not required. Aligning the marks is sufficient. However,

to achieve a better accuracy index is possible. The United States Environmental Protection Agency

(US EPA) recommends vials to be indexed. To index a sample vial:

1. Place the meter on a flat, level surface, DO NOT hold it on hands!

2. Follow the procedure as mentioned at “Preparation of Sample Vial”.

3. Place the sample vial inside the meter.

4. Push the vial until it is fully snapped in.

5. Press READ/ENTER and keep it pressed.

1 2 3 4

TN-100 / T100 1

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