can this probe be left immersed for a long period of item for constant monitoring? Does it compensate for temperature as well?
The new pH sensor uses new solution to design the circuit. We are still not open the schematic now.
DF, how long does the probe need to be calibrated?
The calibration interval is determined by the frequency of use. Normally, you can calibrate it once a month. If used frequently, it can be calibrated once a week. When calibrating, fresh standard buffer solution is recommended.
During the calibration, is it necessary to complete two points calibration? Can I complete only one point calibration?
In the case of low demand, you can use neutral standard buffer solution (7.0) for calibration, which is called single-point calibration and is used to confirm the actual zero point of the pH probe. At this point, the slope is the theoretical value. Then the actual slope of the pH probe can be confirmed by calibration with standard buffer solution (4.0) after signal-point calibration. Therefore, in order to ensure the measurement accuracy, it is recommended to use two-point calibration.
What might be the reason for the first calibration that always fails to calibrate, or prints the unexception value?
When calibrating, the relevant parameters are stored in the specified position in EEPROM. If other data previously saved in the same position in EEPROM, there may be a conflict, resulting in an inability to calibrate properly. Use the following code to erase the contents in the specified position in EEPROM. Run it once, then upload the sample code again to restart the calibration.
/*
This code will reset the corresponding EEPROM used by DFRobot Gravity pH Meter V2, SKU: SEN0161-V2.
When uploaded this code, please open the serial monitor of the Ardino IDE. The correct value of the EEPROM block should be 255.
*/
#include <EEPROM.h>
#define PHADDR 0x00
void setup()
{
Serial.begin(115200);
for(int i = 0;i < 8; i++ )
{
EEPROM.write(PHADDR+i, 0xFF);// write defaullt value to the EEPROM
delay(10);
}
}
void loop()
{
static int a = 0, value = 0;
value = EEPROM.read(PHADDR+a);
Serial.print(PHADDR+a,HEX);
Serial.print(":");
Serial.print(value);// print the new value of EEPROM block used by EC meter. The correct is 255.
Serial.println();
delay(10);
a = a + 1;
if (a == 8)
while(1);
}
