D105: TDS sensor connection

TDS level sensor

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You can connect a TDS sensor to the universal meter smart-MAC D105, which serves to determine the hardness of water and measures the concentration of salts dissolved in water.

TDS is the total dissolved solids.

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A TDS sensor for connecting to 1/8 '' fittings is supplied with an interface board that converts the signal on the sensor to an analog voltage.

Wiring diagram:

  • connect the black wire of the sensor to terminal 1: GND (Ground or -5V)
  • connect the red wire of the sensor to terminal 6: + 5V
  • yellow/green sensor wire connects to terminal 5: ADC

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TDS sensor wiring diagram for smart-MAC D105

Dashboard widget settings

Add a widget indicator, chart or table to the board.

Select your smart-MAC D105 device.

It is recommended to combine TDS liquid level measurement with temperature measurement and use a correction temperature coefficient.
In the section "Arithmetic operation" select the function f(x) and write the function for calculating TDS in [mg / l]

    var vc = d.ADC / (1.0+0.02*(d.T1-25.0));  
    (133.42*vc*vc*vc-255.86*vc*vc+857.39*vc)*0.5;

    where: 

    d.T1 is the temperature of the liquid measured by the temperature sensor T1.

    Change d.T1 to the temperature T1-T5 with your connection. If the temperature sensor did not connect, then instead of d.T1, use the closest data to the temperature of the liquid.

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    Set up notifications on the device and control the built-in relay.

    To configure notifications on the D105 device and automatically control the built-in relay according to the TDS level, you should define a simplified formula for calculating the voltage at the analog input with the corresponding TDS level.

    Vout = TDS * 0,0023

    Where:
    TDS - the level at which the alert should come or the relay is activated;
    Vout - voltage at the analog input, with the corresponding TDS.

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    Mounting options

    The TDS sensor is designed for installation on OSMOS fittings.
    These are plastic crimp tees, as in the photo.

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    To mount the sensor on a DN20 pipe (for example) you will need 2 fittings:

    1. Tee DN20 - G1/4'' - DN20 (as for a standard pressure gauge)
    2. Straight fitting for OSMOS to G1/4"

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    Done!

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