Description
TDS (Total Dissolved Solids) is a measure of the combined total of organic and inorganic substances contained in water. It can be a general indicator of water quality. The unit of TDS measurement is ppm or milligrams per liter (mg/L). The larger the TDS value, the more dissolved substances in water.
In many consumer products, the TDS value is calculated by measuring the conductivity of water (in uS/cm), which is roughly 1 ppm TDS = 2uS/cm. Using parallel cylindrical electrodes with fixed distance as the measuring probe, the probe is placed in water and a voltage is applied between the two electrodes to measure the conductivity.
Factors affecting the accuracy of TDS measurement include water temperature, flow rate, etc. In general, the standard measurement temperature is 25°C. For each 1°C increment, the TDS value increases by about 2%. When measuring TDS, the water temperature is usually measured together for temperature compensation.
To calibrate the BME63M001, it is necessary to prepare a cup of water, a bottle of TDS calibration solution, and a thermometer and uses them to calibrate the conductivity and temperature.
There is a BMCOM on the product to directly connect to BMduino development boards, such as BM53A367A. You can use the product with other development boards, such as Arduino UNO, as well.
- Operating voltage: 3.3V~5.5V
- Operating current: 1.6mA @5.0V
- Standby current: <5.0μA @5.0V
- Includes two channels
- Wide TDS measurement range: 0~5000 ppm
– High accuracy:
⬥ 0~2000ppm: ±5%
⬥ 2000ppm~5000ppm: ±10%
– Resolution:
⬥ 0~500ppm: 0.1ppm
⬥ 500ppm~1500ppm: 0.5ppm
⬥ 1500ppm~2500ppm: 5ppm
⬥ 2500ppm~3500ppm: 10ppm
⬥ 3500ppm~5000ppm: 25ppm - Temperature measurement range: 0~60℃
– Accuracy: ±1℃ - TDS probe: TDS-37
- Interface: UART (baud rate: 9600bps)
- Dimension: 32.1 x 34.1 x 10 mm
- Net weight: 6g
- Product includes: BME63M001 x1, TDS probe (TDS-37) x2
| Pin | Pin name | Function |
|---|---|---|
| 1 | NC | – |
| 2 | RX | UART: RX |
| 3 | TX | UART: TX |
| 4 | VCC | Power supply: 3.3V~5.5V |
| 5 | GND | Ground |
| 6 | TDS-CH1 | TDS channel 1 input |
| 7 | TDS-CH1 | TDS channel 1 input |
| 8 | NTC-CH1 | NTC channel 1 input |
| 9 | NTC-CH1 | NTC channel 1 input |
| 10 | NTC-CH2 | NTC channel 2 input |
| 11 | NTC-CH2 | NTC channel 2 input |
| 12 | TDS-CH2 | TDS channel 2 input |
| 13 | TDS-CH2 | TDS channel 2 input |
| BM25S4021-1 | BME63M001 | ESK-TDS-66F3185 | |
|---|---|---|---|
| Operating voltage | 3.1V~5.5V | 3.3V~5.5V | 3.3V / 5V |
| Standby current | < 3μA @5V | < 5μA @5V | – |
| Measurement range | 0~5000ppm | 0~5000ppm | 0~2000ppm |
| Accuracy | 5ppm~5000ppm @25℃: ±5% 5ppm~5000ppm @5℃~60℃: ±6% |
0~2000ppm: ±5% 2000~5000ppm: ±10% |
±5% @25℃, 5.0V |
| Resolution | 0~500 ppm: 0.1ppm 500~1500ppm: 0.5ppm 1500~2500ppm: 5ppm 2500~5000ppm: 10ppm |
0~500 ppm: 0.1ppm 500~1500ppm: 0.5ppm 1500~2500ppm: 5ppm 2500~3500ppm: 10ppm 3500~5000ppm: 25ppm |
– |
| Temperature measurement range |
0~60℃ | 0~60℃ | 0~60℃ |
| Temperature accuracy | ±0.8℃ | ±1℃ | – |
| MCU | HT66F3185 | HT66F3185 | HT66V3185 |
| Calibration | Has been calibrated at the factory |
Has been calibrated at the factory |
Users need to calibrate it using the TDS workshop |
- MCU: Holtek HT66F3185, A/D Flash MCU with EEPROM, including datasheet, package information, etc.
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