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Shenzhen Sensing Technology Co.,Ltd
Address: TongFuYu Industrial zone, TaoYuan Street, NanShan district, Shenzhen city,China
Telephone：+86-755 13760281851
Email：sales@shenzhensensor.com
SSW-TDS-2U Dual-Channel Digital TDS sensor probe
Publish Time:2020-09-09
We designed a series of sensors for TDS measurement. As a normal function in water quality, TDS sensor had been used in household water purifier, commercial water purifier, fish tank, agriculture ,etc. SSW-TDS-xU( hereinafter referred to as “sensor”) including 的SSW-TDS-2U for 2/8 inches tube and SSW-TDS-3U for 3/8 inches tube。 For the other size, please find a suitable adapter.
2 Parameters
| notes | Min | Typical | Max | Unit | |
| Electrical Characteristics | |||||
| VDD | Supply voltage | 3.3 | 5 | 5.5 | v |
| IDD | Current on working | 4 | mA | ||
| Is | Current on sleeping | 1 | mA | ||
| Full Range | The tds range of the liquid | 0 | 2000 | uS/cm2 | |
| 0 | 1000 | ppm① | |||
| TDS resolution | Min changed value | 1 | ppm | ||
| Temp. calibration range | 0 | 25 | 50 | ℃ | |
| Accuracy | Compare with the standard liquid | 2% | 3% | 5% | %② |
| Probe life | Would be different when the condition is changed | 1 | 3 | 4 | Year |
| Pressure limit | 7 | 9 | Bar | ||
| Flow velocity limit | Must lower this value | 1 | L/min | ||
| Storage temp. | When package is unbroken | 0 | 50 | ℃ | |
| Storage RH. | When package is unbroken | 0 | 95 | %RH | |
| Dimension | |||||
| Metal of the probe | The efficient length of the probe | 5.8 | 6 | 6.2 | mm |
| Diameter of the probe | 1 | mm | |||
| Gap between the probes | 2 | mm | |||
| Length of the head part | SSW-TDS-2U | 59 | mm | ||
| SSW-TDS-3U | 69 | mm | |||
| Total length |
1200mm for SSW-TDS-2U 1500mm for SSW-TDS-3U |
1200 | 1500 | mm | |
1 recommended lower than 2000us/cm3 ,when used in higher than 2000us/cm3 , the accuracy would be bad。
2 the standard instruments is online device ,please don’t compare with the TDS pen
3 Dimensions
SSW-TDS-XU Dimension
4 Reference design
Steps：
1 connect the sensor to your mainboard
2 run the query instruction，get the feedback
3 analyze the data，get the TDSin and TDSout
5 Water Proof
As an important accessories of the water purifier ,the sensor conform to 2/8 inches（6.4±0.1mm）， 3/8 inches（9.5±0.1mm）standard size. So as to achieve the water proof
Take SSW-TDS-2U as an example，we did three water proof operations：
1 knurled needle，to make the needle integrated with the plastic
2 use epoxy to fill the hollow part of the header
3 if the two steps are not enough to prevent the water ,we do injection molding again to make sure all leak risk to be resolved inside
6 Installation instructions
1 cut the power
2 plug the probe into the adapter
3 the source probe should be installed before all filters,the out probe should be installed after all filters
7 Materials specification
8 Order guide
Partno. table：
1 knurled needle，to make the needle integrated with the plastic
2 use epoxy to fill the hollow part of the header
3 if the two steps are not enough to prevent the water ,we do injection molding again to make sure all leak risk to be resolved inside
6 Installation instructions
1 cut the power
2 plug the probe into the adapter
3 the source probe should be installed before all filters,the out probe should be installed after all filters
7 Materials specification
| index | Part name | materials | Vendor/safety standard |
| In-water parts | |||
| 1 | needle |
Stainless steel/ Titanium alloy |
304L,316L TC4 |
| 2 | Plastic header | ABS/PP-R |
CHIMEI 757F(F means food) Formosa 360-F |
| The other parts | |||
| 3 | housing | PVC | ROHS |
| 4 | Wire | PVC &Cu | ROHS |
| 5 | connector | NYLON 66 and Cu. | ROHS |
| 6 | PCB | FR-4 | ROHS |
8 Order guide
Partno. table：
| Tube | TDS | Protocol | Connector | notes | package | |
| SSW-TDS-2U | 2/8 | YES | UART | 2.54 XH 4PIN | ||
| SSW-TDS-2I | 2/8 | YES | I2C | 2.54 XH 4PIN | 4-8 weeks | |
| SSW-TDS-3U | 3/8 | YES | UART | 2.54 XH 4PIN | ||
| SSW-TDS-3I | 3/8 | YES | I2C | 2.54 XH 4PIN | 4-8 weeks |
9 Communication protocols
The sensor use TTL UART by default，slave mode.
UART information：
1 Baud Rate：9600bps
2 parity bit ：none
3 stop bit :1 bit
For more information about Protocal please contact us for datasheet.
10 FAQS
| Issue | Probably reason | Resolve methods |
| TDS value is very lower | Maybe there had bubble in the adapter | Rotate the adapter 90o |
| Temp. to be 0 or 100 | Probe broken | Change and send to us |
| The result be high and low | Maybe caused by the water flow | Change the install position or accept it |
| Source tds is lower than clean tds | May be you need to reverse the two probes | |
| The result is lower than it was test outside the tube | The result would decrease when the probe installed in the tube |
1 accept it 2 ask us for help ,it need to calibration for your machine |
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