Can this probe be submerged in water for long periods of time?
JaneYu 2017-09-28 00:42:47 11 Views181 Replies Can this probe be submerged in water for long periods of time?
Hello,
I've been using the DO sensor in rivers and noticed that after just 3 days of use, the sensor starts to show lower values than normal. I changed the solution, cleaned the cap and probe (the tip of the probe was yellow after only a few days of use) recalibrated it and now it seems to give normal values. I don't understand why I need to change the solution and clean the probe every couple of days for it to work. Is it because the water is turbid? This is very time consuming.
JaneYu hi, can you give me an answer about what is the coverage area of that sensor? needed for our study
JaneYu The coverage of this type of sensor is only in the vicinity of the sensor probe. The sensor can be regarded as an ideal point, and the sensor can only detect a point near the probe.
Almost all sensors in the probe class are in this detection range.
I am using the Gravity DO sensor to measure the DO 24x7 in an
aquaculture pond. The product description says that I should change the
NaOH solution for every 1 month under normal use. How often should I
change the NaOH solution if I am using the sensor continuously 24x7?
And, How often should I calibrate the sensor if am using it continuously
24x7?
JaneYu Me again! I'd like to do a 4-point calibration for increased acuracy. Any suggestions on how to modify the formula in the sample code? I asked in the forum but didn't get an answer yet. I presume I would need to change the following: uint16_t V_saturation = (int16_t)((int8_t)temperature_c - CAL2_T) * ((uint16_t)CAL1_V - CAL2_V) / ((uint8_t)CAL1_T - CAL2_T) + CAL2_V;
Thanks again for your support.
JaneYu Thanks for your response. Now I understand that the calibration method in the air and water are two DIFFERENT methods of calibration, and not performed one after the other.
JaneYu I see that the dissolved oxygen sensor measures up to 20mg/L.What if the water contains more than 20mg/L? It will simply detect 20mg/L?
Also, please explain how saturating water with oxygen in the 2-point calibrating process can calibrate an instrument that only detects 20mg/L of dissolved oxygen. Wouldn't water saturated with oxygen contain more than 20mg/L of dissolved oxygen?
JaneYu Thank you for reaching out to us. Regarding your inquiry:
-This sensor may output a value greater than 20 mg/L if it exceeds 20 mg/L. But this value would not be informative. At the same time, if the saturated oxygen content in the water is >20mg/L then the solution temperature is already extremely low. The water must have frozen and there is no point in measuring it.
-Please refer to the saturated dissolved oxygen table at the bottom of our wiki, the saturated oxygen levels are all a long way from 20mg/L at 0-47°C again.
Hi
How regularly can I monitor? Can I have continuous readings, can the sensor stay in the water for extended periods of time? I want to build a remote controlled system so I can see the measurements on my laptop or mobile.
JaneYu This DO sensor can measure for a long time.
But we recommend you to replace the membrane cap once in 4~5 months, if the water quality you measure is turbid. We recommend you to replace it once in 1~2 months.
Hello, I just purchased this through a local vendor and the signal converter board is not working. When I attache the board to my Uno the llight on the board does not turn on and there is no passing through of data from the probe.
JaneYu Please send the video to our technical support mailbox:
[email protected]
We will help you determine whether it is a hardware problem as soon as possible.
You can upload your video to GoogleDrive and set access to all.
Ok thanks. Can you please define damaged? If it is slightly dented, is that fine? The tip of the electrode leaves a mark when it touches the membrane. Is that fine? Thanks
JaneYu Hello,
I recently bought a DO sensor. The electrode slightly touches the membrane, is this normal? Thanks
JaneYu Why does it read zero once the pH sensor is dipped on the same tub of water?
JaneYu Typically, this light is the power supply light for the sensor.
Could you try testing this sensor in different water conditions to see if the readings change? If it does not change, the sensor may have experienced a hardware failure.
JaneYu Could you test the sensor in a normal cup of water to see if the value is stable?
Is it might because you keep pumping the oxygen into the fish tank?
JaneYu Yes it could, but you have to change the liquid in the Membrane Cap follow the instrcution.
JaneYu Is this a industrial standard sensor?
JaneYu Could you tell us more specficate about the industrial standard you mentioned?
Hi is this device is compatible with ESP32 (micro python) or do you have another device compatible witch (micro) python ?
thx
JaneYu Can this sensor be use on Rasberry Pi ?
JaneYu Yes, you can use the AD module or Raspberry PI expansion board to collect the analog quantity signal of the dissolved oxygen sensor with Raspberry PI.
Hello, Can I use this device on a RPi or ESP32 board ?
thx
JaneYu Yes, you can use the AD module or Raspberry PI expansion board to collect the analog quantity signal of the dissolved oxygen sensor with Raspberry PI.
esp32 is much easier, you just need to change the VREF and ADC values in the code.
