TN400 Portable Turbidity Meter Instruction Manual APERA INSTRUMENTS (Europe) GmbH www.aperainst.
Table of Contents 1 Overview................................................................................................................... - 3 - 2 Technical Specifications ........................................................................................... - 4 2.1 3 4 5 Technical Parameters .................................................................................................... - 4 - Instrument Description ......................................................................
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.
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.
3 INSTRUMENT DESCRIPTION 3.
3.2 Meter and Accessories ① ⑨ ② ③ ④ ① ② ③ ④ ⑧ ⑤ ⑦ ⑥ Calibration Solutions： 0.0, 20.0, 100, 400, 800 NTU Carrying case TN400 Turbidimeter Microfiber cloth Screwdriver ⑤ (to remove battery cover) ⑦ AA Alkaline battery×4 ⑨ Instruction manual ⑥ ⑧ Silicone oil (10 ml) Sample vial×6 Diagram-2 3.
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.
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.
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.
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 calibration is done, press to confirm; repeat the steps to calibrate 400 NTU and 800 NTU. After calibration is done, press 7) Press to calibrate. After to return to measurement mode. to exit calibration mode, the instrument will return to measurement mode as shown in Diagram on the right side. 4.
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.
Press button, the display shows progress bar (see Diagram-6). It will display measured value after 10 seconds. Please press button again for repeated measurement. b) Average Measurement Mode Long press button, release it until you hear a beep, then the instrument enters average reading mode. In this mode, the instrument will perform 10 times of continuous measurement, displaying 1 data every 8 seconds, and will display the average value at the end, see diagram 6.
⚫ 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 it may damage the optical structure. 6 REPLACEMENT PARTS Model Name Description Quantity AMCO 0.0 NTU calibration solution 20/100/400/800 NTU AMCO polymer 0.
