Apera Instruments TN500 User manual

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TN500 Portable Turbidity Meter
Instruction Manual
www.aperainst.de

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Table of Contents
1Introduction ...................................................................................................................................- 3 -
2Technical Specifications ..............................................................................................................- 4 -
3Instrumentation Illustration .........................................................................................................- 5 -
3.1 Summary.................................................................................................................................- 5 -
3.2 Configuration .........................................................................................................................- 6 -
3.3 Display Mode..........................................................................................................................- 6 -
3.4 Keypad ....................................................................................................................................- 7 -
3.5 Power supply..........................................................................................................................- 8 -
3.6 Data Save, Recall, and Deletion ...........................................................................................- 9 -
3.7 Setting for the first time use...............................................................................................- 10 -
4Calibration....................................................................................................................................- 10 -
4.1 Preparation for Calibration .................................................................................................- 10 -
4.2 Calibration Procedure (Take 0 NTU and 20 NTU as an example) ...................................- 11 -
4.3 Notes for Calibration ...........................................................................................................- 12 -
5Turbidity Measurement...............................................................................................................- 14 -
5.1 Sample Vial Handling ..........................................................................................................- 14 -
5.2 Measurement Preparation...................................................................................................- 14 -
5.3 Measurement Mode .............................................................................................................- 14 -
5.4 Notes for Measurement.......................................................................................................- 15 -
6Parameter Setup..........................................................................................................................- 16 -
6.1 Operation ..............................................................................................................................- 16 -
6.2 Parameter Setup Reference Table .....................................................................................- 16 -
6.3 Parameters Description ......................................................................................................- 16 -
7Data Output via USB Port...........................................................................................................- 17 -
8Lamp Replacement .....................................................................................................................- 19 -
9Warranty.......................................................................................................................................- 20 -
*Fully charge the battery before first-time use.

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1 INTRODUCTION
Thank you for purchasing Apera Instruments TN500 Portable Turbidity Meter (hereafter referred to as the
instrument). The instrument uses tungsten filament lamp as the light source and 90° scattering method,
which is compliant with U.S EPA 180.1 method for the determination 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, calibration, and data management,
giving you unparalleled confidence in test results and ease of use.
Intelligent functions such as automatic calibration, operation navigation, parameter setup, real-time
clock display, calibration date check, 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.
TruReadTM measurement mode automatically takes multiple consecutive readings, and calculate
their average, minimum and maximum value, as well as displaying each set of data in a brief test
report. TruReadTM is a much better way to determine the true turbidity of your samples, rather than
relying on just one reading. It's especially suitable for sample solutions with rapid settling and
continuous measurement changes.
Zero turbidity error reminder: the instrument has zero-point calibration and zero-point error reminder
to ensure measurement accuracy for low turbidity solutions.
200 sets of data storage with USB data output to PC (Windows-based).
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.
Multi-language operating system, including English, Spanish & Simplified Chinese.
The instrument’s structure 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, USB charger, and more.

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2 TECHNICAL SPECIFICATIONS
Specification
Description
Measurement
Method
90° scattering measurement, U.S EPA180.1 compliant
Light Source
Tungsten filament lamp
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) (the greater of the two)
Resolution
0.01/0.1/1 NTU (FNU)
Stray Light
≤0.02 NTU (FNU)
Calibration
Standard
AMCO Polymer or Formazin Solution：0, 20, 100, 400 and 800 NTU (FNU)
Detector
Silicon photovoltaic
Measuring Mode
Normal measurement and TruReadTM measurement
Data Storage
200 groups
Data Output
USB to PC
Calibration Record
Calibration date and time
Display
TFT color screen
Sample Vial
Φ25×60 mm，high borosilicate glass with lid
Sample Vial
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
Instrument sealing
grade
IP67
Certificates
ISO9001:2015 and CE
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 INSTRUMENTATION ILLUS TRATION
3.1 Summary
①
Flip cover of the sample vial holder (Close the
cover when measuring)
⑦
Dust proof plug (Take off the plug when
measuring)
②
Housing
⑧
Sample vial holder
③
Display
⑨
Calibration vials or sample vials
④
Keypad
⑩
Positioning mark (Align the mark with the mark
on the calibration vial or sample vial)
⑤
USB Port
⑪
Built-in lithium battery (Rechargeable)
⑥
Lamp cover
Diagram-1
⑦
⑧
⑨
⑩
⑪
④
①
②
③
⑥
⑤

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3.2 Configuration
3.3 Display Mode
①
Calibration Solutions：
0.0, 20, 100, 400, 800 NTU
②
Carrying case
③
TN500 Turbidimeter
④
Microfiber cloth
⑤
Power adaptor (5V 1A)
⑥
Software flash drive
⑦
Silicone oil (10 ml)
⑧
Sample vials×6
⑨
USB Cable (under the meter)
⑩
User Manual
Diagram-2
①Measurement Mode
②Measurements and unit
③Operation Guide
④Battery icon
⑤Date and time
Measuring
Mode
①Calibration solution
②Measurements and unit
③Progress bar
④Operation guide
Calibration
Mode
①
②
③
④
⑤
⑥
⑦
⑧
⑨
⑩

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3.4 Keypad
Diagram-3
①Calibration Mode
②Standard values
③Operation guide
④Finished calibration indicator
①Parameter Setup
②Menu
③Operation guide
①Data Recall
②Saved data numberings
③Saved data
④Operation guide
Calibration
Menu
Parameter
Setup
Data Recall

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3.5 Power supply
The instrument adopts 3.7V rechargeable lithium battery.
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 its performance.When the lithium battery 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 can't work properly.
·If charging the instrument when it is turned on, icon will be displayed. Users can continue
to use 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.
Keypad
Functions
Power on/off
In measurement mode, press to enter or exit calibration mode
In parameter setup and data recall mode, press to return to measurement mode
In measurement mode, short press to perform single measurement; long press
(>3s) to perform continuous measurement.
In calibration mode, press to confirm calibration.
In parameter setup mode, press to confirm change.
In calibration mode, press to select which standard to calibrate.
In parameter setup mode, press to scroll on the menu options.
In recall mode, press to view store number
Press to enter parameter setup mode
Short press to save measured data; long press (>3s) to enter data recall mode

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3.6 Data Log, Recall, and Deletion
a) Manual data logging and Automatic data logging
In parameter setup P4, users can select manual or automatic data logging mode. In the manual mode,
after measurement is finished, press to save the data (also the measurement interface); In
automatic mode, the data (also the measurement interface) will be automatically saved after each
measurement. The instrument has two types of measurement mode: normal measurement (as in
Diagram 4) and TruReadTM measurement (Diagram 5). in Diagram 4 means that 12 sets of data
has been saved. The storage number only indicates the number of measurement interfaces, which is
not equal to the number of actual stored data. In normal measurement mode, one serial number
corresponds to one measurement data. In TruReadTM measurement mode, one serial number
corresponds to multiple measurements (according to user’s setting) in the measurement interface. The
data, as shown in Diagram 5, has 10 measurements. Obviously, for one measurement interface, the
memory storage of the normal measurement is different with that of TruReadTM measurement. The below
table shows the amount of storage for each measurement mode.
Measurement Mode
Storage Capacity
Normal
200 sets
TruReadTM（5 times measurement）
100 sets
TruReadTM（10 times measurement）
61 sets
TruReadTM（15 times measurement）
44 sets
TruReadTM（20 times measurement）
34 sets
Therefore, when the instrument is stored in a mixture of measurement mode, The storage capacity of
measurement interface is different, and it's between 34 to 200. If the stored value is full, will
flash to remind you that the storage is full and you need to delete it before saving new data.
b) Data Recall
In measurement mode, long press (>3s), the instrument will display the saved measurement
interface. As shown in Diagram 6, means there are 15 saved measurement interfaces and
it’s currently showing the 9th one. Press or to check other data. Hold or to quickly
check other data. Press to return to measurement mode.
Diagram 4
Diagram 5
Diagram 6

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c) Data Deletion
Once the data storage is full, users need to delete the data in order to save new data. Select Yes in P5
in parameter setup and press to confirm the deletion (will delete all of the saved data, non-
reversible).
3.7 Setting for first-time use.
The instrument should be fully charged before first-time use. Check and adjust settings for the following
items: date, time, system language, etc. See the detail in Section 6 Parameter setup.
4 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
remaining4 calibration points useAMCO polymer solutions. Note thatthe cap ofthe 0.0 NTU solution
vial can be unscrewed. After the solution is invalidated, users can replace the 0.0 NTU calibration
solution or laboratory distilled water. The 0.0 NTU calibration solution 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.
b) Replace zero turbidity solution
Replace 0.0 NTU calibration solution: open the vial cap, pour out the original solution, add
1/2 distilled water,cover 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 close the vial cap.
Replace laboratory distilled water: open the vial cap, pour out the original solution, add 1/2
distilled water, cover 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
close the vial cap.
The accuracy of 0.0 NTU calibration solution and laboratory distilled water is same. But 0.0
NTU calibration solution has 6 to 12 months of shelf-life, distilled water can only be used for
several days.
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:
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 silicon oil on the vial
surface will affect the measurement accuracy.

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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 fliping 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. Users need to have
rich experience with Formazin calibration solutions.
4.2 Calibration Procedure (Take 0 NTU and 20 NTU as an example)
1) Instrument warm up: 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.

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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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b)Calibration point selection: The instrument has been calibrated at full range before leaving the
factory. For subsequent use, you can select 2 or more points as needed, as long as the estimated
measurement range is between the two calibration points. In calibration setup mode, press
or to select the calibration point.
c) Low turbidity calibration requirement
For low turbiditymeasurements (measurement less than 2 NTU), please test 0.0 NTU calibration
solution. If the accuracy is not meeting 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 calibrateand measure caneliminate theerror caused by different
vials, thus reaching higher accuracy. For example, add distilled water to 1#vial for calibration
and then add sample solution to 1#vial for measurement. Note that the solution vial should be
rinsed thoroughly when changing solutions.
d) Zero Turbidity Error Reminder: 0 NTU is the reference point for low-turbidity measurement. Due
to the complexity of turbidity measurement, various inaccuracies resulting from instruments,
solutions, vials, and operations can cause large errors at the 0 NTU point, which has a great impact
on the measurement accuracy of low turbidity solutions.When the reading is displayed as 0.00 NTU,
if a positive error occurs,a 0.0 NTU calibration solution can be used for verification test. If a negative
error occurs, it cannot be verified. For this instrument, there is a Zero Turbidity Error Reminder
function. If the negative error at the zero point exceeds the preset value, it will prompt users to
recalibrate0.0 NTU.Atthistime, userscanpress tomeasure1or 2 moretimes.If theprompt
appears continuously, please recalibrate 0.0 NTU. In addition, compared with other calibration
solutions, The 0.0 NTU solution is more prone to deterioration and error.When the 0.0 NTU solution
is found to be turbid or flocculent, or if it is judged that it may be out of tolerance based on the
experience of sample tests, please replace the 0.0 NTU solution in time according to the
requirements in Section 4.1b.
e) 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 solution.
If the error is large, the instrument needs to be recalibrated.
f) The instrument does not automatically recognize the calibration solution. If the wrong solution is
selected for calibration, the measurement will be completely wrong. In this case, it can be restored
by recalibrating with the correct calibration solutions.
g) Place the instrument on a flat and level surface. Do not hold the instrument in hand while operating.
h) If using Formazin standards for calibration, please note that the diluted Formazin standard is
unstable. Please make sure to use the freshly made Formazin standard to ensure calibration
accuracy.

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5 TURBIDITY MEASUREMEN T
5.1 Sample Vial Handling
a) 6 sample vials are included in the test kit. The cap is marked with 1#to 6#, and the bottom of the vial
also has the same number. The number of the vial and the cap should always be the same. *Pay
attention that 1#and 2#vials are only for low turbidity solution measurement. (< 2 NTU)
b) The vial has been rigorously cleaned and sterilized. They can be used directly for the first time. For
subsequent uses, follow the steps below to perform a thorough cleaning.
Clean the inside and outside of the sample vial holder with detergent → rinse with distilled water
or deionized water multiple times → Rinse the vial twice with the sample solution → Pour the
sample solution into the vial → Close the cap.
5.2 Measurement Preparation
a) Collect the sample solution with a clean container and add the
solution to the 4/5 of the vial (about 18ml), see Diagram 7. Then
close the lid.
b) Before the measurement, users can slowly flip the sample vial a
few times and let it stand for 2 to 5 minutes to eliminate potential
air bubbles (see Diagram 8).
c) Clean off the surface of the vial to ensure it is dry, clean and free
of stains. Apply a small drop of silicone oil on the surface of the vial and wipe it off with a micro-
fiber cloth. Then wipe again with filter paper or high-quality tissue paper. See section 4.1(c) for
details.
5.3 Measurement Mode
a) Normal Measurement Mode
Press , the screen will display the progress bar, and the measured value will be
displayed in 20 seconds. To take the next measurement, press again.
b) TruReadTM Measurement Mode
Long press and release the key when youhear a beep (see Diagram 9.1), then enter
TruReadTM mode. For example, if the number of continuous measurements is set to 20 times
in parameter setting P2, a measured value will be displayed every 20 seconds. Diagram 9.2
is the third measurement. Diagram 9.3 is the display interface at the end of TruReadTM
measurement. The average, maximum and minimum values will be displayed along with a
list of 20 measured values. TruReadTM measurement mode can be used for observing the
stabilizing process of turbidity, and can also be used for testing rapid-settling solutions.
Diagram 7
Diagram 8

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c) We Recommend using TruReadTM Measurement Mode
Turbidity measurement is a complex analytical measurement. Its error and stability are related
not only to the design of the instrument, but also many other factors such as solution uniformity
and precipitation, stray light, air bubble interference, sample vial contamination, optical errors,
operation technology and more. Therefore, using normal measurement mode will obviously result
in a larger error. For this reason, we recommend using TruReadTM measurement mode with 5
times continuous measurement for regular tests, that is, set the continuous measurement to 5
times in parameter settingP2, and read the average value each time toimprove the measurement
accuracy. Compare the maximum and minimum values at the same time. If the difference is too
large, it means that the measured value is not reliable, the solution may be unstable or there
might be other factorsaffecting the measurement. You need to check the root-cause and measure
again. For rapid-settling or continuously changing solutions, set continuous measurement for 10,
15 or 20 times.
5.4 Notes for Measurement
a) Keep the sample stable: After the vial is placed into the sample cell, it is recommended to wait for
1 to 2 minutes before calibration, as the solution will experience some shaking when the vial moves,
which may result in inaccurate measurements.
b) Sample Vial cleaning requirement: Sample vial must be rigorously cleaned and free from smudges
and scratches. When wiping, user should grip the cap and bottom to avoid leaving fingerprints on
the surface of the vial. Its surface should be applied with a drop of silicone oil be wiped with a micro-
fiber cloth. After that, please clean with filter paper or high-quality tissue paper. See section 4.1(c)
for details.
c) Mixing and Degassing: Samples should not be vigorously shaken or vibrated. It is recommended
that users gently shake the sample vial to make solution evenly distributed. Air bubbles in solution
will cause big error to turbidity measurement. So, the vial should be left stand still for 2 to 5 minutes
to eliminate potential air bubbles before measuring. But mixing and degassing simultaneously is a
difficult process to handle, especially for solution with precipitates, which requires some operating
experience or make some limits in test conditions. For example, limit the mixing condition and waiting
time for degassing to be the same before comparing measurements.
d) Other Requirements
On the premise of ensuring evenly distributed samples, sample solution should be measured
immediately to prevent temperature changing and precipitates from affecting measurements.
Diagram 9.3
Diagram 9.2
Diagram 9.1

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Avoid sample dilution for measurement as much as possible.
Avoid operating under direct sunlight.
Do not pour solution into the sample vial holder. Sample vials must be used for measurement.
Please do not wash the sample vial holder as this may damage its optical structure.
6 PARAMETER SETUP
6.1 Operation
Press to enter parameter setup mode → press or to switch P1-P2-...P9 → press
to enter each parameter → press or to make changes → press to confirm → press
to return to measurement mode.
6.2 Parameter Setup Reference Table
6.3 Parameters Description
P1 ─ calibration date and time: users can check the date and time of last calibration
P2 ─ Continuous measurement: users can select the number of times for continuous measurements (5,
10, 15 or 20 times).
P3 ─ Measurement Unit: users can select which unit to use: NTU or FTU
P4 ─ Data logging mode: users can select automatic data logging mode or manual data logging mode
(see section 3.6 for details)
P5 ─ Delete saved data: select Yes to delete all the saved data (non-reversible)
P6 ─ Auto. close timer: users can select in how soon the instrument will turn off automatically if there is
no operation: 10 minutes, 20 minutes, 30 minutes, or off; when selecting off, the instrument can only be
turned off by pressing the power button.
P7 ─ select language: users can select English, Spanish, or Chinese as the system language.
P8 and P9 ─ set up date and time: in the setting process icon indicates to switch between date and
time, icon indicates to change the digit of date and time.
Symbol
Parameter
Content
P1
Last calibration date and time
View
P2
Continuous measurement
5-10-15-20
P3
Measurement unit
NTU-FTU
P4
Data logging mode
manual-automatic
P5
Delete saved data
No-Yes
P6
Auto-power off timer
10-20-30-OFF
P7
Select language
English-Spanish-Chinese
P8
Date setting
/
P9
Time setting
/

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7 DATA OUTPUT VIA USB PORT
7.1 Display Interface
①— Display area for saved data
To display numberings, date, time, measurement method (normal measurement or continuous
measurement), measured values, and measurement unit. For continuous measurement, average,
maximum, and minimum values will also be displayed.
②— Instrument serial number, last calibration information and parameter setting information.
③— Function buttons
7.2 Operation Key in Software Interface
Refresh — Port reset key. When the instrument and computer are not connected, click to connect.
SyncTime — Sync time key, click to sync computer time with instrument time.
Download — Download key, click to send data from instrument memory to computer.
Clear — Clear key, click to delete data saved in computer (data saved in instrument will not be deleted).
Export — Export key, click to export the saved data to computer in a Microsoft Excel document.
Exit — Exit key, press to exit PC-Link program.
①
②
③
Diagram 10

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7.3 Install Software
The instrument uses Turbidimeter PC-Link communication software. It is only compatible with Windows-
based operating system. The communication port is USB. Copy and paste the program files from the
USB drive to the computer. Connect USB cable to the instrument and computer, open Turbidimeter PC-
Link.exe, the instrument will connect with computer automatically. icon will be displayed at the top
of LCD screen. If the instrument cannot connect with computer, please click "Refresh" key or install the
relevant software driver included in the USB drive.
7.4 Run Software
Click Download key, all data in the instrument memory will be sent to the computer. When the program is
running, all measurement information will be sent to the computer via USB. There is no data storage limit
and the data will not be saved in the instrument. In Manual data logging mode, press key after
measurement is completed to save data in the computer; in Auto. data logging mode, data will be
automatically saved in the computer after each measurement is completed. For TruReadTM measurement
mode, it will save all the measured values along with maximum, minimum and average values.
7.5 Data Processing
Click Export key to export saved data to a Microsoft Excel document. The data can be further analyzed
and printed.

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8 LAMP REPL ACEMENT
8.1 Light source check
Observe the light source on the left side of the sample vial holder as in Diagram 11. Turn on the instrument,
and press . The light source will light up for 5 seconds. If it’s not lighting up or it’s flashing, please
replace the lamp.
8.2 Lamp Replacement
The tungsten filament lamp module (sold separately) is shown as in Diagram 12. The lamp hole and
socket are as in Diagram 13. Diagram 14 shows you how to replace the lamp.
Unscrew the lamp
cover with a coin
Use a tweezer to
unplug the socket
Use a tweezer to
unscrew the lamp
cover.
Take out the old tungsten
filament lamp module
Install the new tungsten
filament lamp module.
Close the lamp cover
and screw tight with a
tweezer.
Use a tweezer to plug
wire into the gap and
plug in the socket
Screw on the lamp
cover tightly
Diagram 12
Tungsten filament lamp module
Diagram 13
lamp hole and socket
Diagram 11
Check light source
socket
lamp hole
lamp
cover
gasket
tungsten
filament
lamp
Socket
Light source

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9 WARRANTY
We warrant this instrument to be free from defects in material and workmanship and agree to repair or
replace free of charge, at the option of APERA INSTRUMENTS any malfunctioned or damaged product
attributable to the responsibility of APERA INSTRUMENTS for a period of TWO YEARS for the instrument
from the delivery.
This limited warranty does NOT cover any issues due to:
Accidental damage
Improper use
Normal wear and tear
Transportation
Storage
Failure to follow the product instructions
Unauthorized maintenance, modifications, combination or use with any products, materials,
processes, systems or other matter
Unauthorized repair
External causes such as accidents, abuse, or other actions or events beyond our reasonable
control.
APERA Instruments (Europe) GmbH
Wilhelm-Muthmann-Str. 15
42329 Wuppertal, Germany
Tel.: [phone]
[email protected]