can this probe be left immersed for a long period of item for constant monitoring? Does it compensate for temperature as well?
JaneYu 2018-10-21 05:55:29 14 Views89 Replies can this probe be left immersed for a long period of item for constant monitoring? Does it compensate for temperature as well?
Dear Mr. DFROBOT.
If I buy this product and it is defective, what is the procedure for changing the product.
This possible scenario will involve the costs of returning the defective product from the country of purchase to China and, again, shipping the product to replace the defective product.
I will be attentive to your comments.
JaneYu If you have a defective product, you can report the problem by sending an e-mail to our technical support e-mail address. If we determine that your sensor has a hardware failure and the product is covered by the 3 month warranty. We will send you a replacement.
However, usually the pH probe and the adapter board do not fail at the same time, so you may need to work with our technical support colleagues to perform some simple troubleshooting steps. Once we have identified the faulty part, we will send you a new probe or adapter plate.
1-Yes, DHL is available as an optional shipping method on our page.
2-We recommend that you send an email to
[email protected]
to confirm delivery details
JaneYu Could you please use the DFRobot_PH_EC.ino sample code in this Github repo, under the examples folder for testing and see if it works?
JaneYu The comments at the top of
```c++
* @n Serial Commands:
* @n PH Calibration：
* @n enterph -> enter the calibration mode
* @n calph -> calibrate with the standard buffer solution, two buffer solutions(4.0 and 7.0) will be automaticlly recognized
* @n exitph -> save the calibrated parameters and exit from calibration mode
* @n EC Calibration：<--- Is this really supposed to be the same?
* @n enterph -> enter the PH calibration mode
* @n calph -> calibrate with the standard buffer solution, two buffer solutions(4.0 and 7.0) will be automaticlly recognized
* @n exitph -> save the calibrated parameters and exit from PH calibration mode
```
But the code DFRobot_PH_EC.ino shows:
```c++
if (readSerial(cmd)) {
toUpperCase(cmd);
if (strstr(cmd, "PH")) {
ph.calibration(voltagePH, temperature, cmd); //PH calibration process by Serail CMD
}
if (strstr(cmd, "EC")) {
ec.calibration(voltageEC, temperature, cmd); //EC calibration process by Serail CMD
}
```
It appears the code is expecting the process for the pH Calibration to be:
- PH
- enterph
- calph
- exitph
DFRobot_EC.cpp code shows different serial commands:
``` c++
byte DFRobot_EC::cmdParse(const char* cmd)
{
byte modeIndex = 0;
if(strstr(cmd, "ENTEREC") != NULL){
modeIndex = 1;
}else if(strstr(cmd, "EXITEC") != NULL){
modeIndex = 3;
}else if(strstr(cmd, "CALEC") != NULL){
modeIndex = 2;
}
return modeIndex;
}
```
Regardless, none of these serial cmds appear to provide any console output and the readings show as
```bash
07:31:39.015 -> pH:4.12, EC:9.56ms/cm
07:31:40.026 -> pH:4.09, EC:9.56ms/cm
07:31:41.006 -> pH:4.12, EC:9.56ms/cm
07:31:42.024 -> pH:4.12, EC:9.56ms/cm
07:31:43.036 -> pH:4.12, EC:9.53ms/cm
```
When pH is in 4.0 solution and EF is in 12.88 solution.
Similar results for EC sensor.
So there is no feedback as if any of the serial cmds did anything.
Needless to say, after investing considerable money into your products and the code does not work, then the product does not work.
It is also extremely frustrating to have to hunt down code and have conflicting operational documentation and advice and multiple code bases thrown around. The [Wiki](https://wiki.dfrobot.com/Gr... and on [GitHub](https://github.com/DFRobot/... and referenced videos all seem to contradict each other or at the very least have different instructions and code.
Hi DFRobot Support,
From the product info "Attention" section. It stated:
4. After completing the measurement, disconnect the pH probe from the
signal conversion board. The ph analog sensor probe should not be
connected to the signal conversion board without the power supply for a
long time.
May I know why they must be disconnected? And how long is "a long time"?
JaneYu A1: The ph probe is analogous to an ultra-high internal resistance battery Ifthe ph board is powered down the input impedance of the board decreases equivalent to a shorted battery.
A2: If you will not be supplying power to the sensor for the next 1-2 hours, we recommend that you disconnect
the signal conversion board from the probe.
Hello.
I'm a brazilian and I'm developing a project that I need this sensor. If I buy this sensor, can you send me in Brazil or do you have a seller in Brazil?
JaneYu Sorry, we don't have a test for this board. If you need to use it with ph sensor, it is recommended to check the voltage value and ADC digits, and modify the variables in the code according to the actual situation.
JaneYu Hi, is this kit is compatible with Lolin nodemcu v3 ? Everywhere on the product page an esp32 or an arduino uno is used. I have a lot of Lolin nodemcu v3 and I'd like to use it with this kit and arduino code. Thanks
JaneYu How to prevent products from being contaminated by substances in water?
What kind of substances can contaminate the probe?
How can the probe avoid being contaminated?
JaneYu The probe is not an industrial probe and should not be used continuously for too long (e.g., one month). You are recommended to immuse it into 3N KCL solution, which will recovery of electrode performance.
The probe cannot measure strong acids, strong bases or other corrosive solutions. Use in dehydrating media such as anhydrous ethanol, potassium dichromate etc. is strictly forbidden.
Hi, do you provide schematics of your V2 PH sensor signal conversion board?
JaneYu Hi, I am trying to use this with the newer Arduinos like Arduino Nano 33 IoT, which do not have EEPROM but Flash memory. Is there anyway to make it work on those?
JaneYu Sorry, this sensor do not offically support Nano 33 Iot. You can modify the library yourself, and store the calibration information in Flash.
Hi,
on the pH buffer solutions it is mentioned that the readings shall met at certain temperature, i.e. 25°C. What should be the correction factor if we do have the temperature readings available too?
Thanks in advance,
Umut
JaneYu What's the difference between this probe and the "Meter kit PRO V2"?
JaneYu V2 Pro uses industrial-grade probes, which can continuously measure and collect data for 7*24 hours
Hi, i am using the probe now for a few weeks and noticed an issue with my proceedure.
Sensor freshly calibrated it reads different ph levels depending on if the white part of the Probe is under water too or not. Offset is about 0.4 ph as far as I remember. Any best practise here or something else might be broken?
Same water, same container.. Just the submerge level is different. As far as I know the whole probe should be able to be submerged?
JaneYu I am trying to calibrate the probe but every time I do it reads "Buffer Solution Error Please Try Again". I think its because the pH reading is too low as it is currently reading a pH around 2.5 for the 7 buffer and a negative number for the 4 buffer. Could this be because the power source it is plugged into is 3.3V instead of 5V? Can someone help me with this?
JaneYu Hello, I just received the Analog pH sensor V2, and would like to run it using my Arduino feather board. The sample calibration code uses a library called EEPROM, but the feather does not support this library. How can I work around this?
JaneYu Hi there. I'd like to use this probe in seawater at a depth of about 100 meters, which is approximately 150 of pressure per square inch.
Do you know if the probe would work at this depth?
I notice in the pictures above that there appears to be an air bubble in the probe tip area. I'm concerned that the pressure might cause a rupture due to the pressure difference at the air bubble...
JaneYu Hi DFRobots, is it crucial to use an ADC-controller to get values from the PH and EC probe if you use an ESP32? For now, I have hooked up the probes and conversion boards to my Arduino Mega. As I can see the built-in ADC has the same resolution as the ESP32 and the values read on with the Arduino Mega are almost the same as the one I reed on my EC and Ph meter. The only reason I want to move to the ESP32 is to log the results to an IoT platform.
JaneYu 
