Analog TDS Sensor FAQ【SEN0244】
Q1:Does this sensor have a temperature sensor? How to make the temperature compensation?
A1:This TDS probe has no temperature sensor, but the temperature compensation algorithm is reserved in the sample code. The temperature variable in the sample code will default to 25 °C without a temperature sensor. You can add a waterproof temperature sensor to read the temperature,then update the temperature variable, to make automatic temperature compensation.
Q2:Is it possible to measure ppm above 1000?
A2:Sorry, the recognition range of this sensor is 0~1000ppm. If the actual TDS value in water exceeds 1000, the sensor cannot recognize it and can only output the highest value of 1000ppm.
Q3:Can the sensor be immersed in water for a long time to measure?
A3:Yes, the sensor can be immersed in water for long periods of time.
Q4:My sensor keeps outputting NAN or OVF, what should I do?
A4:Please upload the code below to clear the Epprom cache, then re-upload the Wiki example code to see if the output returns to normal.
#define TDSADDR 0x08
for(int i = 0;i < 8; i++ )
EEPROM.write(TDSADDR+i, 0xFF);// write defaullt value to the EEPROM
static int a = 0, value = 0;
value = EEPROM.read(TDSADDR+a);
Serial.print(value);// print the new value of EEPROM block used by TDS meter. The correct is 255.
a = a + 1;
if (a == 8)
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