background image

 

- 11 - 

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 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 solution. 

If the error is large, the instrument needs to be recalibrated. 

e)  The  instrument  does  not  automatically  recognize  the  calibration  solution.  If  the  wrong  solution  is 

selected for calibration, the measurement will be completely wrong. To fix this problem, simply re-

calibrate the meter selecting the correct calibration solutions. 

f) 

Place the instrument on a flat and level surface. Do not hold the instrument in hand while operating. 

g)  If  using  Formazin  standards  for  calibration,  please  note  that  the  diluted  Formazin  standard  is 

unstable. Please make sure to use freshly made Formazin standard to ensure calibration accuracy. 

 

 

TURBIDITY MEASUREMENT 

5.1 

Sample Vial Handling 

1)    There are 6 sample vials contained in the case, marked 1#~6# on the cap and bottom of the vial. 

Please note the number of sample vial should be same as that of vial cap, and do not mix up. Please 

always use 1

#

~2

sample vial to measure samples with turbidity less than 2 NTU. 3#~6# sample vials 

are used for measurement of other solutions. 

2)    Sample vials have been meticulously cleaned and disinfected before they leave factories. They can 

be used directly for the first time. Before subsequent uses, sample vials should be thoroughly cleaned: 

wash the interior and exterior of the vial in a detergent solution. Repeatedly rinse with clean distilled 

water or deionized water. Rinse sample vial with sample solution twice. Fill sample vial with sample 

solution then screw the vial cap tightly. 

5.2 

Measurement Preparation 

1)    Collect sample solution in a clean container, fill sample solution to the 4/5 position of the sample vial 

Summary of Contents for TN400

Page 1: ...1 TN400 Portable Turbidity Meter Instruction Manual APERA INSTRUMENTS LLC aperainst com...

Page 2: ...Display Mode 6 3 4 Keypad 7 3 5 Power Supply 7 4 Meter 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 5 T...

Page 3: ...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 bac...

Page 4: ...s 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 25...

Page 5: ...vial holder Close the cover when measuring Dust proof plug Take off the plug when measuring Housing Sample vial holder Display Calibration vials or sample vials Keypad Positioning mark Align the mark...

Page 6: ...0 NTU Carrying case TN400 Turbidimeter Microfiber cloth Screwdriver to remove battery cover Silicone oil 10 ml AA Alkaline battery 4 Sample vial 6 Instruction manual Diagram 2 Measurement mode Measure...

Page 7: ...erform 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 so...

Page 8: ...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...

Page 9: ...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 solu...

Page 10: ...00 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...

Page 11: ...ation solution If the wrong solution is selected for calibration the measurement will be completely wrong To fix this problem simply re calibrate the meter selecting the correct calibration solutions...

Page 12: ...s of continuous measurement displaying 1 data every 8 seconds and will display the average value at the end see diagram 6 The average measurement mode can be used for observing the stabilizing process...

Page 13: ...d for measurement Please do not wash the sample vial holder as it may damage the optical structure 6 WARRANTY We warrant this instrument to be free from defects in material and workmanship and agree t...

Page 14: ...L 1 bottle T200 1 20 100 400 800 NTU AMCO polymer Compatible with TN400 TN480 4 bottles T500 3 Sample vials with lid 25 60mm 1 6 6 pcs TN400 S3 Silicone oil 10mL 1 bottle APERA INSTRUMENTS LLC Address...

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