Interference between PH sensor and TDS sensor

Other Hardware Sensors
1

So I've been trying to setup PH sensor and TDS sensor from Dfrobot.

Is there any solution to overcome electrical interference between PH sensor and TDS sensor, so I can get both sensors to work in the same container?

2

No. pH meters read tiny electrical currents, which the TDS meter will supply. You need to disconnect the TDS meter completely for the pH meter to work.

3

You might to try turning the sensor power on when reading it and off all other times.

4

On our river water quality monitor we turn off all sensors between readings. When it is time to collect data we do the following.

  1. Turn on temperature sensor and read temperature. Turn off temperature sensor.
  2. Turn on PH sensor and read it. Turn off PH sensor.
  3. Turn on dissolved oxygen sensor and read it. Turn off dissolved oxygen sensor.
  4. Turn on conductivity sensor and read it. Turn off conductivity sensor.
  5. Build log data from sample time and sensor data.
  6. Write log data to SD card.

We use this order because the temperature sensor is the least disruptive and least sensitive to outside electrical and disturbance. Also the temperature correction may be needed for other sensors.
The PH sensor is most sensitive to electrical disturbance and doesn't cause electrical disturbance.
The dissolved oxygen sensor is next most sensitive.
The conductivity sensor sends electrical pulses through the water and causes major havoc with sensitive sensors. Doing the conductivity sensor last allows the other sensors to recover between samples.

5

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