Apera Instruments TN420 Manuale utente

TN420 Portable Turbidity Meter

Instruction Manual

APERA INSTRUMENTS, LLC

aperainst.com

 
Table of Contents 
1Introduction...............................................................................................................- 1 -
2Technical Specifications............................................................................................- 2 -
3Instrumentation Illustration........................................................................................- 3 -
3.1 Overview ............................................................................................................- 3 -
3.2 Configuration ......................................................................................................- 4 -
3.3 Display Mode......................................................................................................- 4 -
3.4 Keypad ...............................................................................................................- 5 -
3.5 Power Supply .....................................................................................................- 6 -
4Meter Calibration ......................................................................................................- 6 -
4.1 Preparation for Calibration..................................................................................- 6 -
4.2  Calibration Procedure (Take 0 NTU and 20 NTU as an example) ......................- 8 -
4.3 Notes for Calibration...........................................................................................- 9 -
5Turbidity Measurement ...........................................................................................- 10 -
5.1 Sample Cuvette Handling.................................................................................- 10 -
5.2 Measurement Preparation ................................................................................- 10 -
5.3 Measurement Mode..........................................................................................- 10 -
5.4 Notes for Measurement .................................................................................... - 11 - 
6 Lamp Replacement.................................................................................................... - 11 - 
6.1 Light Source Check ..........................................................................................- 12 -
6.2 Lamp Replacement ..........................................................................................- 12 -
7 Warranty.....................................................................................................................- 13 -
8 Replacement Parts ....................................................................................................- 13 -
 
 V1.1
*Please fully charge the battery before first-time use.

- 1 -

1INTRODUCTION

Thank you for purchasing Apera Instruments TN420 Turbidity Meter (hereafter referred to as the

instrument). The instrument uses tungsten filament lamp (400 – 600nm) as the light source and 90°

scattering method, which is compliant with U.S EPA 180.1 method for the determination of of turbidity in

drinking, ground, surface, and saline waters, domestic and industrial wastes. It is suitable for on-site and

laboratory use.

The instrument provides accurate results with simple measurement and calibration, giving you unparalled

confidence in turbidity test results and easy of use. The main functions and features include:

⚫Intelligent functions such as automatic calibration, operation navigation, parameter setup, automatic

power off, low voltage indication, and a replaceable tungsten filament lamp.

⚫Large TFT color screen with blue background for measurement mode, green background for

calibration mode.

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

⚫Average measurement mode automatically takes multiple consecutive readings, and calculate the

average from 10 times of measurement, which is ideal for sample solutions with rapid settling and

continuous measurement changes.

⚫3.7V rechargeable lithium battery can supply power for over 20 hours of continuous measurement.

The battery life is 5 times longer compared with tungsten lamp turbidimeter in the market using AA

alkaline batteries.

⚫Meets IP67 rating, ideal for use under harsh environment and field.

⚫Comes with a carrying case, which includes the meter, calibration solutions, and other accessories,

convenient for use and carry.

- 2 -

2TECHNICAL SPECIFICATIONS

Measurement

Method

90° scattering measurement

Light Source

Tungsten (400 – 600nm) filament lamp, compliant with US EPA 180.1 Method

Measuring Range

0 to 1000 NTU (FNU), automatic range switch

0.01 to 19.99 NTU (FNU)

20.0 to 99.9 NTU (FNU)

100 to 1000 NTU (FNU)

Accuracy

≤ ±2% of reading+ stray light

Repeatability

≤ ±1% of reading or 0.02 NTU(FNU) (whichever is greater)

Resolution

0.01/0.1/1 NTU (FNU)

Stray Light

≤0.02 NTU (FNU)

Calibration

Standard

AMCO Polymer solution or Formazin Solution: 0, 20, 100, 400 and 800 NTU

(FNU)

Detector

Silicone photovoltaic

Measuring Mode

Normal measurement; Average Measurement

Display

TFT color screen

Sample Cuvette

Φ25×60 mm, high borosilicate glass with lid

Sample Cuvette

Volume

18 ml

Power supply

3.7V Rechargeable lithium battery

Working 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 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

- 3 -

3INSTRUMENTATION ILLUSTRATION

3.1Overview

①

Flip cover of the sample cuvette holder

(Close the cover when measuring)

⑦

Dust-proof plug (Take off the plug when

measuring)

②

Housing

⑧

Sample cuvette holder

③

Display

⑨

Calibration cuvettes or sample cuvettes

④

Keypad

⑩

Positioning mark (Align the mark with the

mark on the calibration cuvette or sample

cuvette)

⑤

USB Port

⑪

Built-in lithium battery (Rechargeable)

⑥

Lamp cover

Diagram-1

⑪

⑩

⑦

⑧

⑨

④

①

②

③

⑥

⑤

- 4 -

3.2 Configuration

3.3 Display Mode

Measuring

Mode

Calibration

Mode

①

Calibration Solutions：

0.0, 20.0, 100, 400, 800 NTU

②

Carrying case

③

TN420 Turbidimeter

④

Microfiber cloth

⑤

Power adaptor (5V 1A)

⑥

Silicone oil (10 ml)

⑦

Sample cuvettes×6

⑧

USB Cable (under the meter)

⑨

User Manual

①Calibration solution

②Measurements and unit

③Progress bar

④Operation guide

①Measurement Mode

②Measurements and unit

③Operation Guide

④Battery icon

Diagram-2

⑨

①

②

③

④

⑤

⑧

⑦

⑥

- 5 -

Calibration

3.4 Keypad

Keypad

Functions

⚫Power on/off

⚫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 normal measurement; long

press the key to perform average measurement

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

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

Diagram 3

①Calibration mode

②Standard values

③Operation guide

④Finished calibration indicator

- 6 -

3.5 Power Supply

The instrument adopts 3.7V rechargeable lithium battery. Fully charge the battery before first-time

use.

a) Charging mode

·Charge via Power adaptor: connect instrument and power adaptor with a USB cable. Adaptor

specification: AC110 to 240V, 50/60Hz, output: 5V/1A.

·Charge via Computer: connect instrument and a computer with a USB cable.

Under normal circumstances, it is recommended to use the power adapter to charge the lithium

battery to ensure the performance. When the lithiumbattery voltage is lower than 3V, the instrument

will shut down, and it’s time to recharge it.

b) Battery capacity indication

·Battery capacity icon: , please recharge the battery when

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

recharged, otherwise the instrument cannot work properly.

·If charging the instrument when it is turned on, icon will be displayed. Users can continue

using the instrument while it is being charged.

·If charging the instrument when it is turned off, "Charging......" will be displayed, and "Charging

is completed" will be displayed after a full charge.

4METER CALIBRATION

4.1Preparation 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

cuvette 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 cuvette caps cannot be

opened. Simply dispose the solutions after they are expired or invalidated and buy new ones from

your supplier to replace. See the detail in Section 8 Replacement Parts.

b) Replace zero turbidity solution

•Open the 0.0 NTU cuvette cap, pour out the original solution, add 1/2 distilled water, screw on

the cap and shake the cuvette to rinse it off and pour out the water. Repeat it 3 times. Shake off

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

laboratory distilled water. Then close the cuvette 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.

- 7 -

AMCO 0.0 NTU solution is provided in the default kit. For purchase details, please refer to Section 8

Replacement Parts.

c) Clean cuvette surface

Apply a small drop of silicone oil on the surface of the cuvette 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, whichhelps

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 cuvette

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 cuvette and sample cuvette 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. Generally, it can be used directly without shaking or

flipping the cuvette (to make the solution even). For AMCO polymer calibration solutions that

have not been used for a long time, slowly flip the cuvette 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 cuvette 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.

- 8 -

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 cuvette), then wait for 3 to 5 minutes.

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

cuvette. Align the arrow on the cuvette lid with the arrow

on the sample cuvette 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 cuvette in the sample

cuvette 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 cuvette

in the sample cuvette 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.

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