Apera Instruments TN400 Manuel utilisateur

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TN400 Portable Turbidity Meter

Instruction Manual

APERA INSTRUMENTS (Europe) GmbH

www.aperainst.de

 
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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...................................................................................................- 11 - 
5.4 Notes for Measurement ...............................................................................................- 12 - 
6Replacement parts ................................................................................................. - 13 -
7Warranty ................................................................................................................. - 13 -
 
 
 
 
 
 
 
 
V5.3 

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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 turbidity in a reliable and

simple manner wherever you are.

Main features and functions

⚫Large TFT color screen with clear on-screen instructions for easy operation.

⚫Average measurement mode automatically takes 10 sets of readings consecutively and

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

sample solutions with rapid settling and continuous measurement changes.

⚫U.S. EPA certified, non-toxic, easy-to-use polymer standard calibration solutions

⚫Rugged design, suitable for use in harsh environments.

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

sample vials, and more.

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

condensation

Storage Condition

Instrument: -40 to 60°C (-40 to 140°F)

Calibration Solution: 5 to 30°C (41 to 86°F)

Instrument sealing

grade

IP67

Certificates

CE and RoHS

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

Diagram-1

①Flip cover of the sample vial holder

(Close the cover when measuring)

②Housing

③Display

④Keypad

⑤Battery cover

⑥Dust proof plug (Take off the plug

when measuring)

⑦Sample vial holder

⑧Calibration vials or sample vials

⑨Positioning mark (Align the mark with

the mark on the calibration vial or

sample vial)

⑨

⑥

⑦

⑧

⑤

①

②

③

④

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3.2 Meter and Accessories

Diagram-2

3.3 Display Mode

Measuring

Mode

①Measurement mode

②Measurements and unit

③Operational guide

④Battery icon

Calibration

Mode

①Calibration solution

②Measurements and unit

③Progress bar

④Operational guide

Calibration

①Calibration mode

②Standard values

③Operation guide

④Finish calibration indicator

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

①

②

③

④

⑤

⑧

⑦

⑥

⑨

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3.4 Keypad

Diagram- 3

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

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

replaced, otherwise the instrument cannot 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.

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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 of the 0.0

NTU solution vial can be unscrewed. After the solution is invalidated, users can replace the 0.0

NTU calibration solution or use fresh laboratory distilled water. The AMCO 0.0 NTU calibration

solution refill can be purchased from the supplier; For the remaining 4 calibration solutions, their

vial caps 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 6 Replacement Parts.

b) Replace zero turbidity solution

⚫Open the vial cap, pour out the original solution, add 1/2 distilled water, screw on the cap and

shake the vial to rinse it off and pour out the water. Repeat it 3 times. Shake off the distilled

water in the vial. Pour in new AMCO 0.0 NTU calibration solution or fresh laboratory distilled

water and close the vial cap.

⚫AMCO 0.0 NTU calibration solution has 6 to 12 months of shelf-life, distilled water is only valid

for a couple of days. AMCO 0.0 NTU solution is provided in the default kit. For purchase

details, please refer to Section 6 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 lint-free cloth to

evenly distribute the silicone oil on the surface in order to cover smudges and scratches, which

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

①The silicone oil applied should not be too much. After wiping with lint-free 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

⑤The U.S EPA approved AMCO polymer standard calibration solution is very uniform and

stable. It does not precipitate, drift or condense. Generally, it can be used directly without

shaking or flipping the vial (to make the solution even). For AMCO polymer calibration

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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 will 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 would make the measurement unstable. Users need to have rich experience

handling Formazin calibration solutions.

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

1) Instrument warm up (only required for low-range or high-accuracy measurement):

Power on the instrument, set parameter P2 (continuous measurement time) to 5 times.

Long press to start continuous measurement (don't insert the vial), then wait

for 3 to 5 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.

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.

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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:

b) Calibration point selection: The instrument has been calibrated at full range before leaving

the factory. Users can select 2 or more points as needed to calibrate, as long as the target

measurement range is in between of the two calibration points. In calibration setup mode, press

or to select the calibration point.

c) Low turbidity calibration requirement

⚫For low turbidity measurements (measurement less than 2 NTU), please test 0.0 NTU

calibration solution. If the accuracy is not meeting your requirements, calibrate the instrument

at 0.0 NTU and 20.0 NTU before test; then use 1#or 2#vial for measurement.

⚫Using the same sample vial to calibrate and measure can eliminate the error caused by

different vials, thus achieving higher accuracy. For example, add laboratory distilled water to

1#vial for zero-point calibration and then add sample solution to 1#vial for measurement.

Note that the test vial should be rinsed thoroughly when changing solutions.

d) High turbidity calibration requirement: For turbidity measurement greater than 2 NTU, it is

recommended to calibrate once a week, or to test a calibration solution close to the sample

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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