Calibration of the Industrial pH electrode(SKU:FIT0348)
loooljoe 2018-02-03 00:50:21 2249 Views4 Replies I'm following the calibration guide: https://www.dfrobot.com/wiki/index.php/ ... :_SEN0161)
and I am using the sample code from the same guide.
When I short the BNC connectors with offset = 0, I get a reading from the Arduino IDE serial monitor of 3,6.
That means that I have to put in an offset of 3,3 to achieve the standard 7 pH with the BNC connectors shorted.
This seems like a very high offset?
When I put the probe in a solution with a confirmed pH of 4, the serial monitor shows a reading of 5,7 pH.
I then adjusted the gain potential on the meter all the way, but it only gets the value to 4,8.
This means I get a wrong reading of approximately 0,8 pH.
Am I doing something wrong? Is the guide wrong for the probe I'm using?
I am using the Industrial pH electrode(SKU:FIT0348)
and I am using the sample code from the same guide.
When I short the BNC connectors with offset = 0, I get a reading from the Arduino IDE serial monitor of 3,6.
That means that I have to put in an offset of 3,3 to achieve the standard 7 pH with the BNC connectors shorted.
This seems like a very high offset?
When I put the probe in a solution with a confirmed pH of 4, the serial monitor shows a reading of 5,7 pH.
I then adjusted the gain potential on the meter all the way, but it only gets the value to 4,8.
This means I get a wrong reading of approximately 0,8 pH.
Am I doing something wrong? Is the guide wrong for the probe I'm using?
I am using the Industrial pH electrode(SKU:FIT0348)
2019-03-07 23:39:01 I am working on a small project using the same probe. Would it be possible to get your code to compare? karinapaz24
karinapaz24 2018-02-05 22:17:35 I got it working perfectly.
The problem was that the USB cable was not enough power, I meassured only 2.8V on the A0 power pin.
I hooked up a 9V battery as a power supply to the Arduino and then I got 5V on the A0 power pin. loooljoe
The problem was that the USB cable was not enough power, I meassured only 2.8V on the A0 power pin.
I hooked up a 9V battery as a power supply to the Arduino and then I got 5V on the A0 power pin.
loooljoe 2018-02-05 15:27:20 You can short the BNC connector on the board first and check the reading in serial monitor, it should be around 7, it the offset is too high, there might some problem with the adaptor board. robert.chen
robert.chen 2018-02-04 07:54:02 Hello, try to put your electrode to PH 7 calibrating solution then try to calibrate watch what it shows, set the offset, then put in ph 4 and adjust the gain. I have problem with the sheme too, 1 works bad, second work good 2 month now it goes up ph without reazons... laauris1321
laauris1321 