APERA TDS20 Pocket TDS Tester
Battery Installation
Please install batteries according to the following steps. Please note polarity: “+” (positive) is upward; “-” (negative) is downward
Keypad Functions
- Short press——- < 2 seconds
- Long press——– > 2 seconds
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| 1. Short press to turn on, long press to turn off; 2. When turned off, long press to enter setup; 3. In mode setting, short press to change parameter; |
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1. When turned on, long press to enter calibration mode. 2. In calibration mode, short press to confirm calibration; 3. In mode setting, short press to confirm parameter selection. |
Complete Kit
Calibration
- Rinse the probe in distilled water and dry it. Short press
to turn on the tester. - Long press
to enter calibration mode; Short press to exit. - Dip the probe into 1413 μS calibration solution. Stir gently, leave it to stand, LCD displays (Diagram 3), short press to complete 1-point calibration. The tester returns to measuring mode, and calibration icon
appears at the button left of LCD. - Rinse probe in distilled water and dry it. Follow the steps in 4.2 – 4.3 to complete 2nd point calibration in 12.88 mS calibration solution, tester returns to measuring mode, calibration icons
display on bottom left of LCD.
TDS Measurement
- Short press to turn on tester. Rinse probe in distilled water and dry it.
- Stir probe in the sample solution gently, leave it to stand. Get readings after the smile icon comes up and stays.
Notes
- The tester adopts 1413 μS and 12.88 mS standard calibration solutions. Users can use 1-2 point calibrations as needed. For most circumstances, calibrating in 1413 μS to complete 1st point calibration will meet testing requirements.
- The tester has self-diagnosis functions:
- The tester has already been calibrated after manufacture. Usually, users can use the tester right away, or test it in the calibration solutions to test its accuracy. When error is large, calibrate it before using.
- We recommend replacing new calibration solutions after 5-10 times of calibrations to keep the solution’s accuracy.
Parameter Setting
Parameter setting reference chart:
| Symbol | Parameter Setting Items | Code | Factory Default |
| P1 | TDS Factor | 0.40 to 1.00 | 0.71 |
| P2 | Select Temperature Unit | °C – °F | °C |
| P3 | Restore to factory default | No – Yes | No |
How to setup parameters:
- When turned off, long press to enter setup → short press to switch
- P1-P2-P3→ Short press , parameter flickering→short press to choose, short press to confirm parameter selection→Long press to switch off
Parameter setting notes
TDS Factor (P1):
Users can adjust TDS Factor by experimental data or experience. The following chart lists some commonly used TDS Factors for reference.
Conductivity and TDS Factor
| Conductivity of the solution | TDS Factor |
| 0~100 μS/cm | 0.60 |
| 100~1000 μS/cm | 0.71 |
| 1~10 mS/cm | 0.81 |
| 10~100 mS/cm | 0.94 |
P2-Select temperature unit (°C-°F):
In P1 mode, press 
to enter P2, press 
, °C or °F flickering, press to choose °C-°F, press to confirm parameter selection. Long press to return to measurement mode.
Restore to factory default:
Select Yes to restore the calibration to the theoretical values and parameter setting to original values. When meter’s calibration or measurement performs abnormally, this function can be adopted so the meter goes back to factory default setting and then users can conduct calibration or take measurements again.
Technical Specifications
|
TDS | Range | 0–100.0 ppm, 0–1000 ppm, 0–10.00 ppt |
| Resolution | 0.1/1 ppm, 0.01 ppt | |
| Accuracy | ±1% F.S | |
| Calibration points | 1-2 points | |
| Automatic Temp. Compensation | 0-50˚C | |
|
Temp. | Range | 0-50˚C |
| Resolution | 0.1˚C | |
| Accuracy | ±0.5˚C |
Other Functions & Parameters
| Indication of calibration points |   | Auto Power-off | Power-off in 8 minutes if no operation |
| Indication of stable measurements |  | Waterproof level | IP67, floats on water |
| Self-Diagnosis information | Er1, Er2 | Power Supply | AAA batteries*4 |
| Low battery reminder |  Flashes to remind to replace batteries | Battery Life | 1000 hours |
| Dimensions/Weight | Instrument: 40*31*178mm/107g; Carrying case: 190*165*140mm/438g | ||
Warranty
We warrant this instrument to be free from defects in material and workmanship and agrees to repair or replace free of charge, at option of APERA INSTRUMENTS (Europe) GmbH, any malfunctioned or damaged product attributable to responsibility of APERA INSTRUMENTS (Europe) GmbH for a period of two years from the delivery (a six-month limited warranty applies to probes). This warranty does not apply to defects resulting from actions such as misuse (violation of the instructions in this manual or operations in the manner not specified in this manual), improper maintenance, and unauthorized repairs. Warranty period is the time limit to provide free service for the products purchased by customers, not the service life of the tester or probe.
Apera Instruments reserves the right to update the information in this manual without giving notice in advance.
APERA INSTRUMENTS (Europe) GmbH Wilhelm-Muthmann-Straße 18 42329 Wuppertal, Germany
Contact: [email protected]
Website: www.aperainst.de
Tel. +49 202 51988998
