Apera Instruments TN400 Manuel utilisateur

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TN400 Portable Turbidity Meter

Instruction Manual

APERA INSTRUMENTS LLC

aperainst.com

 
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Table of Contents 
1Overview..................................................................................... - 3 -
2Technical Specifications................................................................ - 4 -
2.1 Technical Parameters.............................................................................. - 4 -
3Instrument Description................................................................ - 5 -
3.1 Instrument Overview.............................................................................. - 5 -
3.2 Meter and Accessories............................................................................ - 6 -
3.3 Display Mode.......................................................................................... - 6 -
3.4 Keypad ................................................................................................... - 7 -
3.5 Power Supply.......................................................................................... - 7 -
4Meter Calibration ........................................................................ - 8 -
4.1 Preparation for Calibration ..................................................................... - 8 -
4.2 Calibration Procedure (Take 0 NTU and 20 NTU as an example) .............. - 9 -
4.3 Notes for Calibration............................................................................. - 10 -
5Turbidity Measurement ............................................................. - 11 -
5.1 Sample Vial Handling............................................................................ - 11 -
5.2 Measurement Preparation.................................................................... - 11 -
5.3 Measurement Modes ........................................................................... - 12 -
5.4 Notes for Measurement........................................................................ - 12 -
6Warranty ................................................................................... - 13 -
7Replacement Parts..................................................................... - 14 -
 
 
 

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1 OVERVIEW

Thank you for purchasing Apera Instruments TN400 Portable Turbidity Meter (hereafter referred to as

the instrument).

The instrument uses infrared light emitting diode (LED 860±30nm) as the light source and 90°

scattering method, which is compliant with ISO 7027 and DIN EN 27027 standards for the

determination of turbidity for water solutions. TN400 allows you to measure the turbidity of an aqueous

sample both in laboratory and in the field.

The instrument is an outstanding combination of the most advanced electronic technology and software

design. With built-in microprocessor chips, elegant design, easy to use, the meter has the following

remarkable characteristics:

⚫Smart functions, such as automatic calibration, operating instructions, automatic power-off, low

voltage display, etc.

⚫Large TFT color screen, with blue background in measuring mode, green background in calibration

mode, and text and graphics in operational directive.

⚫Operation guidance and reminders in the process of calibration, measurement and parameter setting.

⚫Average measurement mode automatically takes 10 times consecutive readings, calculate and

display the average. It improves the accuracy of the measurement, especially suitable for sample

solutions with rapid settling and continuous measurement changes.

⚫The instrument meets IP67 water-resistant grade and is suitable for use in harsh environments.

⚫Everything comes in a rugged carrying case, including accessories such as calibration solutions, test

vials, and more, convenient for use and carry.

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2 TECHNICAL SPECIFICATIONS

2.1 Technical Parameters

Measuring Method

ISO 7027 and DIN EN 27027 compliant nephelometric method（90°）

Light Source

Infrared light emitting diode (860±30nm)

Measuring Range

0 ~ 1000 NTU, automatic range selection:

0.01~19.99 NTU

20.0~99.9 NTU

100~1000 NTU

Accuracy

≤ ±2 % of reading + stray light

Repeatability

≤ ± 1% of reading or 0.02 NTU (FTU), the greater of the two

Resolution

0.01 / 0.1 / 1 NTU(FNU)

Stray Light

≤0.02 NTU(FNU)

Calibration Standards

AMCO Polymer or Formazin Solution:

0, 20, 100, 400 and 800 NTU (FNU)

Detector

Silicon photovoltaic

Measurement Mode

Normal measurement and average measurement mode

Display

TFT color screen

Sample Vials

Φ25×60 mm, high borosilicate glass with lid

Sample Volume

18 ml

Power Supply

4× “AA” Alkaline Batteries

Operating Condition

Temperature: 0 to 50°C（32°F to 122°F）； Relative humidity：

0 to 90% at 30°C, 0 to 80% at 40°C, 0 to 70% at 50°C, no condensation

Storage Condition

Instrument: -40~60℃ (-40~140℉)

Calibration Solution: 5~30℃ (41~86℉)

Instrument sealing grade

IP67

Certificates

Limited Warranty

2 years

Dimension and Weight

Meter: (90×203×80) mm/385g

Test Kit: (310×295×110) mm/1.5kg

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3 INSTRUMENT DESCRIPTION

3.1 Instrument Overview

①

Flip cover of the sample vial holder (Close the

cover when measuring)

⑥

Dust proof plug (Take off the plug when

measuring)

②

Housing

⑦

Sample vial holder

③

Display

⑧

Calibration vials or sample vials

④

Keypad

⑨

Positioning mark (Align the mark with the

mark on the calibration vial or sample vial)

⑤

Battery cover

Diagram-1

⑨

⑥

⑦

⑧

⑤

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3.2 Meter and Accessories

3.3 Display Mode

Measuring

Mode

Calibration

Mode

①

Calibration Solutions：

0.0, 20.0, 100, 400, 800 NTU

②

Carrying case

③

TN400 Turbidimeter

④

Microfiber cloth

⑤

Screwdriver (to remove battery cover)

⑥

Silicone oil (10 ml)

⑦

AA Alkaline battery×4

⑧

Sample vial×6

⑨

Instruction manual

Diagram-2

①

②

③

④

⑤

⑧

⑦

⑥

⑨

①— Measurement mode

②— Measurements and unit

③— Operational guide

④— Battery icon

①— Calibration solution

②— Measurements and unit

③— Progress bar

④— Operational guide

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Calibration

3.4 Keypad

Key

Functions

⚫Power on/off

⚫The meter will automatically shut off 10 mins after last key press

⚫In measurement mode: press to enter calibration mode

⚫In calibration mode: press to exit calibration mode

⚫In measurement mode: long press to switch measurement units NTU-FTU

⚫In measuring mode: Short press the key to perform single-shot measurement; long

press the key to perform continuous measurement

⚫In calibration mode: press the key to confirm the calibration.

⚫In calibration mode, press the key to select standard solution.

3.5 Power Supply

1. The instrument adopts 4 pieces of AA alkaline battery. Make sure there is no mixture of new & old

batteries or different models of batteries.

2. Battery capacity indication

Battery capacity icon: , please replace new batteries when

Diagram- 3

①— Calibration mode

②— Standard values

③— Operation guide

④— Finish calibration indicator

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icon displays to ensure measuring accuracy; when icon displays, the battery must be

replaced, otherwise the instrument can't work properly. To extend battery life, user can setup auto-

power off timer in Parameter Setup P6 according to usage requirements

3. Use the screwdriver to remove the four screws on the battery cover and open the battery cover.

Insert 4 pieces of “AA” alkaline battery. Please make sure the polarity is correct. Put on the battery

cover and screw tightly.

4 METER CALIBRATION

4.1 Preparation for Calibration

a) Calibration Point

The instrument has 5 calibration points: 0 NTU, 20 NTU, 100 NTU, 400 NTU, and 800 NTU. Among

them, 0 NTU point uses AMCO 0.0 NTU calibration solution or laboratory distilled water, and the

remaining 4 calibration points use AMCO polymer solutions. Note that the cap ofthe 0.0 NTU solution

vial can be opened. Once the solution is invalidated, users can replace the 0.0 NTU calibration

solution or laboratory distilled water. The AMCO 0.0 NTU calibration solution can be purchased from

the supplier; For the remaining 4 calibration solutions, their vial caps are sealed and cannot be

opened. Simply dispose the solutions after they are expired and buy new ones from your supplier to

replace. See the detail in Section 7 Replacement Parts.

b) Replace zero turbidity solution

⚫Replace with 0.0 NTU calibration solution: open the vial cap, pour out the original solution, add

1/2 distilled water, close the cap and shake the vial to rinse it and pour out the water. Repeat it

3 times. Shake off the distilled water in the vial. Pour in new 0.0 NTU calibration solution and

tighten the vial cap.

⚫Replace with laboratory distilled water: open the vial cap, pour out the original solution, add 1/2

distilled water, close the cap and shake the vial to rinse it and pour out the water. Repeat it 3

times. Shake off the distilled water in the vial. Pour in new laboratory distilled water and tighten

the vial cap.

⚫The accuracy of 0.0 NTU calibration solution and laboratory distilledwater is same. But 0.0 NTU

calibration solution has 6 to 12 months of shelf-life, distilled water can be contaminated easily

after air contact and lose the validity in a couple of days.

AMCO 0.0 NTU solution is provided in factory configuration. For purchase details, please refer to

Section 7 Replacement Parts.

c) Clean vial surface

Apply a small drop of silicone oil on the surface of the vial and wipe it off with a micro-fiber cloth to

evenly distribute the silicone oil on the surface so as to cover smudges or scratches, which helps

light scattering. But please pay special attention to the following points:

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①The silicone oil applied should not be too much. After wiping with micro-fiber cloth, please wipe

with filter paper or high-quality tissue paper to clean off. Excessive residual silicone oil on the

vial surface will affect the measurement accuracy.

②It's not necessary to use silicone oil for each calibration and measurement. Apply silicone oil

every several days or once a week. In between, just clean the surface with filter paper or high-

quality tissue paper.

③Clean the calibration vial and sample vial together and keep the steps and actions consistent to

achieve same degree of cleanliness.

④Stability of calibration solutions

The U.S EPA approved AMCO polymer standard calibration solution is very uniform and stable.

It does not precipitate, drift or condense. It can be used directly without shaking or flipping the

vial (to make the solution even). For polymer calibration solutions that have not been used for a

long time, slowly flip the vial twice and let it stand for 2 minutes. Be careful not to shake the

solution vigorously, as this will create air bubbles which destabilize the measurement; For 0.0

NTU calibration solution, do NOT shake or flip. If using Formazin calibration solution, as it tends

to precipitate easily, each time users must flip and shake the vial to make the solution even. But

sediment can still occur during tests and make the measurement unstable. Operating

experience is important in using Formazin calibration solutions.

4.2 Calibration Procedure (Take 0 NTU and 20 NTU as an example)

1) Instrument warm up: Power on the instrument, and then wait for 3 minutes.

2) Open the flip cover and place the 0.0 NTU calibration

vial. Align the arrow on the vial lid with the one on the

sample vial holder and close the flip cover.

3) Press to enter the calibration menu, the cursor is

at 0 NTU. Press to start calibration.

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4) After calibration is done, press to confirm.

The instrument will return to the calibration menu (see

Diagram on the right side). The OK sign indicates that 0

NTU has been calibrated and prompt to calibrate 20

NTU.

5) Place the 20.0 NTU calibration vial in the sample

vial holder, press to start 20 NTU calibration.

After calibration is done, press to confirm. The

instrument will return to the calibration menu (see

diagram on the right side). The OK sign indicates that

20 NTU has been calibrated.

6) If you want to continue to calibrate 100, 400 and 800 NTU, place the 100 NTU calibration vial in

the sample vial holder and press to calibrate. After calibration is done, press to

confirm; repeat the steps to calibrate 400 NTU and 800 NTU. After calibration is done, press

to return to measurement mode.

7) Press to exit calibration mode, the instrument will

return to measurement mode as shown in Diagram on the

right side.

4.3 Notes for Calibration

a) Calibration point verification: The calibration point can be verified after the calibration is

completed. If the calibration point has a large error, enter the calibration mode and repeat the

calibration. For calibration point accuracy, users can refer to the following standards:

Calibration point

Accuracy for reference

0 NTU

≤0.05 NTU

20 NTU

≤±0.2 NTU

100 NTU

≤±2 NTU

400 NTU and 800 NTU

≤±5 NTU

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