ORP question or a problem..
ORP question or a problem..
Hi,
I have some problems with my ORP module. I calibrated it as it was mentioned in instructions, and seems that everything went well, but after few hours orp started showing 550 mv constantly (previously it was in range of 320-350 mv). Tried to re-calibrate, but nothing helped. Noticed that after disconnecting probe it keeps showing 550 mv. When I put BNC terminator on it show 29 mv. Need help with this issue...
I have some problems with my ORP module. I calibrated it as it was mentioned in instructions, and seems that everything went well, but after few hours orp started showing 550 mv constantly (previously it was in range of 320-350 mv). Tried to re-calibrate, but nothing helped. Noticed that after disconnecting probe it keeps showing 550 mv. When I put BNC terminator on it show 29 mv. Need help with this issue...
Re: ORP question or a problem..
What i've done is:rimai wrote:What are the numbers you got when doing the calibration?
Started calibration (0 mv) - attached BNC connector, press OK
Then connected ORP probe with given fluid (470 mv) and pressed OK
Then added probe into aquarium, into probe holder near PH probe.
After that ORP showed ~320-350 in tank.
Yesterday somehow I managed to keep it working, it showed ~360 mv, but from that moment it keep rising, and now it is 450 mv and it is going up...
Re: ORP question or a problem..
The module does not come with the calibration fluid.
The probe comes in a storage solution that is only good for storage during transportation.
You should find the solution online or in your local store.
The probe comes in a storage solution that is only good for storage during transportation.
You should find the solution online or in your local store.
Roberto.
Re: ORP question or a problem..
Well allright... But even if the probe is not calibrated - it should show some values, not 550 mv...rimai wrote:The module does not come with the calibration fluid.
The probe comes in a storage solution that is only good for storage during transportation.
You should find the solution online or in your local store.
Re: ORP question or a problem..
550mV is the max range.
If you calibrated with that fluid, which has about 200mV and you place it in your tank which has about 350mV, you would go above scale.
If you calibrated with that fluid, which has about 200mV and you place it in your tank which has about 350mV, you would go above scale.
Roberto.
Re: ORP question or a problem..
Oh, heres the point...ok, i'll try to find solution for 470 mv to calibrate the proberimai wrote:550mV is the max range.
If you calibrated with that fluid, which has about 200mV and you place it in your tank which has about 350mV, you would go above scale.
Re: ORP question or a problem..
It would be nice to get calibrating solutions with expansions or RA, because now I need to wait till I get such calibrating solutions. Its not so easy to get them...
Re: ORP question or a problem..
Ok, about 550 mv is it clear that it is because of calibration. Another question is why ORP probe shows only 0 mv...
Re: ORP question or a problem..
If you don't get it calibrated properly, you will go out of bounds and get unpredictable results.
Try adding this to the setup() section of your code:
This will force default calibration numbers, instead of using whatever numbers you got, which most likely are wrong numbers.
Try adding this to the setup() section of your code:
Code: Select all
InternalMemory.ORPMax_write(285);
InternalMemory.ORPMin_write(1400);
Roberto.
Re: ORP question or a problem..
Ok, now I've tried everything, and I can say that there is a problem...
1) i've tried adding code that you suggested. It worked only for couple of hours. After that ORP keeps showing 0 mv
2) I've bought expensive Hanna 470 mv solution. Calibrated: as 0 mv it showed numbers 1866, and for 470 mv it showed 188. So for 3-4 hours it was ok, but in the morning I've checked ORP and it is 0 mv again...
I don't know what to do now... Maybe the probe is faulty?
1) i've tried adding code that you suggested. It worked only for couple of hours. After that ORP keeps showing 0 mv
2) I've bought expensive Hanna 470 mv solution. Calibrated: as 0 mv it showed numbers 1866, and for 470 mv it showed 188. So for 3-4 hours it was ok, but in the morning I've checked ORP and it is 0 mv again...
I don't know what to do now... Maybe the probe is faulty?
Re: ORP question or a problem..
The numbers you got look correct.
When it shows 0mV, what happens when you reboot RA?
When it shows 0mV, what happens when you reboot RA?
Roberto.
Re: ORP question or a problem..
After reboot it shows the same 0 mv. On controller it sometimes looks that it shows 0.9 or 0.5 (but the last number is cut off)rimai wrote:The numbers you got look correct.
When it shows 0mV, what happens when you reboot RA?
Re: ORP question or a problem..
Use the joystick and go into calibration mode.
What number do you see?
Make sure to choose cancel when you are done. Don't click ok.
What number do you see?
Make sure to choose cancel when you are done. Don't click ok.
Roberto.
Re: ORP question or a problem..
I see 0 mv and number - 0
Re: ORP question or a problem..
ORP Extension is connected to expansion hub (all lights are green in ORP extension) tried to change cable from ORP extension to expansion hub - didn't helped.
Re: ORP question or a problem..
What if you connect the ORP module directly into the relay box?
Roberto.
Re: ORP question or a problem..
Ok, tried it. Same result. 0 mv. Connected directly to relay box (main). Also tried to other expansion hub slots. Nothing...
Re: ORP question or a problem..
Can you please go into calibration, connect the terminator and check which values you get?
I want to work with raw values instead of calibrated values, just because there may be a problem with the calibration numbers.
I want to work with raw values instead of calibrated values, just because there may be a problem with the calibration numbers.
Roberto.
Re: ORP question or a problem..
Getting: 0 mv and 1875 numbers
Re: ORP question or a problem..
Ok, 1875 is good...
So, we know for sure that the module is working and responding with correct numbers.
Can you connect the ORP probe and do the same thing and read what numbers you get one more time just to ease my mind?
So, we know for sure that the module is working and responding with correct numbers.
Can you connect the ORP probe and do the same thing and read what numbers you get one more time just to ease my mind?
Roberto.
Re: ORP question or a problem..
Getting: 0 mv and 0 number
Re: ORP question or a problem..
Ok, so can you do the same thing, but using the pH probe now?
Roberto.
Re: ORP question or a problem..
It started to show:
0mv and numbers 100
and keep on going till 1950
0mv and numbers 100
and keep on going till 1950
Re: ORP question or a problem..
Awesome, that's good because the pH probes give negative mV readings for alkaline water.
Connect the ORP probe back.
Now, what numbers do you get if you place the probe in a cup with tank water?
And what number do you get if you place the probe in a cup with tap water from the faucet?
Connect the ORP probe back.
Now, what numbers do you get if you place the probe in a cup with tank water?
And what number do you get if you place the probe in a cup with tap water from the faucet?
Roberto.
Re: ORP question or a problem..
In cup with tank water: 0 mv and 0 number
In cup with tap water from the faucet: 0 mv and 0 number
In cup with tap water from the faucet: 0 mv and 0 number
Re: ORP question or a problem..
I don't know what happened. Didn't do anything but suddenly it started to show some ORP values... When calibrating getting:
0 mv and 619 numbers
Same was and other days...After the night it showed again 0
0 mv and 619 numbers
Same was and other days...After the night it showed again 0
Re: ORP question or a problem..
I don't think so, as everything is connected without tension. And nothing was done or even touched and it started showing somethingrimai wrote:Could it be any bad connection somewhere??