filthPrinciple of Water Quality Detector: Real time detection of multiple key parameters of enterprise sewage quality using fully digital electrode method [Model: TW-SS07, IoT integrated device, Tianwei Environment supports customized services]In the context of enterprise sewage treatment, the sewage quality detector serves as a "digital sentinel" for accurately sensing water quality dynamics, and achieves real-time synchronous monitoring of multiple parameters through the full digital electrode method. This technology focuses on high-precision electrodes and utilizes the potential difference, current changes, or resistance fluctuations generated when the electrode surface reacts specifically with ions and molecules in wastewater to convert chemical signals into quantifiable digital signals. For example, the pH electrode generates a potential difference through the selective response of a glass membrane to hydrogen ions, the dissolved oxygen electrode calculates the oxygen content based on the current intensity generated by the oxygen reduction reaction, and parameters such as ammonia nitrogen and heavy metals are accurately captured through the potential changes of the ion selective electrode. The all digital electrode method abandons the accuracy loss in traditional analog signal transmission, and combines intelligent algorithms to perform real-time correction and compensation of raw data. It can effectively eliminate the interference of environmental factors such as temperature and salinity, ensuring stable output of key indicators such as pH value, dissolved oxygen, conductivity, and ammonia nitrogen under complex working conditions. It provides reliable data support for enterprises to optimize sewage treatment processes and achieve standard discharge.

1、 Product Introduction
The SS07 portable multi parameter water quality analyzer is an electrode based water quality analysis instrument that uses fully digital electrodes to detect water quality, water temperature, conductivity, and other parameters PH、 Ammonia nitrogen, dissolved oxygen cod、 Turbidity parameter. The instrument is equipped with a self-developed FTIOT operating system, which is easy to operate, stable in performance, accurate in measurement, and has a wide detection range. It is also equipped with a high-capacity rechargeable lithium battery, making it convenient for users to conduct water quality testing in the field or laboratory at any time.
2、 Host parameters
| Charging input voltage |
4.5V-5.5V |
| charging current |
<2A |
| screen size |
3.5 inches |
| screen resolution |
480*800 ☆ |
| Screen interface |
MIPI DSI ☆ |
| USB port |
2 (Supports external mouse, keyboard, 4G, etc.) ☆ |
| Type-C |
1 (Supports external mouse, keyboard, 4G, etc.) ☆ |
| RS485 |
2 (Supports Modbus, JSON, ASC inputs, etc.) |
| External sensor supply voltage |
12V |
| External sensor power supply current |
1A |
| operating system |
Ftiot (based on Linux-5.4) ☆ |
| CPU |
2*Cotex-A7,650Mhz ☆ |
| RAM |
512M DDR3 ☆ |
| Flash |
8G-64G |
| OpenGL |
ES 2.0 ☆ |
| Wifi |
support |
| 4G |
optional |
| button |
support |
| Capacitive touch screen |
support |
| software architecture |
B/S ☆ |
| Web access |
Support ☆ |
| MTP mode |
Support ☆ |
| Multi terminal login |
Support ☆ |
| IPv6 |
Support ☆ |
| Sensor communication method |
RS485、TCP、UDP、Http ☆ |
| Data forwarding method |
RS485、TCP、UDP、Http ☆ |
| Remote SSH |
Support ☆ |
| remote debugging |
Support ☆ |
3、 Sensor parameters and configuration
| serial number |
name |
measurement range |
principle |
measurement accuracy |
resolution |
configuration |
remark |
| 1 |
temperature |
0~50℃ |
High precision digital sensor |
±0.3℃ |
0.01℃ |
✔ |
|
| 2 |
pH |
0~14(ph) |
Electrochemistry (salt bridge) |
± 0.1PH |
0.01 |
✔ |
|
| 3 |
ORP |
-1500mv~1500mv |
Electrochemistry (salt bridge) |
± 6mv |
1mV |
|
|
| 4 |
conductivity |
0~5000uS/cm,0~10000uS/cm |
Contact electrode method |
± 1.5% |
1uS/cm |
✔ |
|
| 5 |
TDS |
0-10000ppm 0-200ppt |
Contact electrode method |
±1.5%; ±0.1°C |
1ppm 0.01ppt |
|
|
| 6 |
salinity |
0-10000ppm 0-200ppt |
Contact electrode method |
±1.5%; ±0.1°C |
1ppm 0.01ppt |
|
|
| 7 |
sludge concentration |
0~20.000g/L |
scattered light method |
± 5% (depending on sludge homogeneity) |
0.001g/L |
|
|
| 8 |
turbidity |
0~40NTU (low turbidity) |
scattered light method |
± 1% |
0.1NTU |
|
Optional |
| 0~1000NTU (medium turbidity) |
scattered light method |
± 1% |
|
| 0~3000NTU (high turbidity) |
scattered light method |
± 1% |
✔ |
| 9 |
dissolved oxygen |
0~20mg/L |
Fluorescence lifetime method |
± 2% |
0.01mg/L |
✔ |
|
| 10 |
ammonia nitrogen |
0-1000.00mg/L (default) 0-1000mg/l/(customizable) |
Ion selective electrode method |
10% of the reading, ± 0.5 ℃ |
0.01mg |
✔ |
Range optional |
| 11 |
suspended solids |
0~2000mg/L |
scattered light method |
± 5% (depending on sludge homogeneity) |
0.1mg/L |
|
|
| 12 |
residual chlorine |
0~5.00 mg/L |
Ion selective electrode method |
± 5% of the reading |
0.01mg/L |
|
The best accuracy is achieved when the flow rate is between 0.42m/s and 0.85m/s |
| 13 |
chloride ion |
0-3500.0mg/L |
Ion selective electrode method |
±5% |
0.1mg/L |
|
|
| 14 |
Total Hardness |
0~1000.0mg/L |
Ion selective electrode method |
± 10% of the reading |
0.1mg/L |
|
|
| 15 |
cod |
0~1000mg/ L |
UV254 absorption method |
±5% |
0.1mg/L |
✔ |
COD and chlorophyll are equipped with automatic cleaners to prevent biological attachment and avoid light window pollution, ensuring long-term monitoring stability; Automatic cleaning time and frequency can be set, with a power consumption of 0.7W |
| 16 |
chlorophyll |
0~400ug/L |
fluorescence method |
R2>0.999 |
0.01ug/L |
|