Redox reading erratic

[Dalmerjd]

My redox reading can jump 5-20 points in seconds. Should the probe be replaced, cleaned? The tolerance is set at 5, it calibrates in 220 in less than 120 seconds and is about 1 year old.
If cleaning is required, what is the correct procedure. My instructions went AWOL.

[Blahenazo]

Cleaning info can be found here
http://www.aquariumcomputer.com/Foru...ead.php?t=1606

they say probes don't last very long but mine became more stable when I added an earth pin to my tank (but it was measuring 30 /40 less when my T5's where on.)

[almost]

Want to control nitrareductor filter with reedox, setting point -250.

Readings change constantly, reedox is about -150 always.

Now I can measure No3 in the aquarium as a result of bad controlling of the nitrareductor filter.

I changed the signal filter to 1, the same occurs.

What can I do to stable up the reading so it can control the filter in the area of -250 -200 that it should be operated?

Please advice.

.

[Matthias]

Readings change constantly, reedox is about -150 always.

how do the readings change? range? frequency?
do the readings also change if the probe is immerged in glas of water?

[almost]

how do the readings change? range? frequency?
do the readings also change if the probe is immerged in glas of water?

It changes +-5 in a second.
I didn't test it in a glass of water, I can try if needed.
The probe is that of Aquamedic because it has o 13mm thread and it was calibrated in your fluids, calibration went well.

The same probe in another ORP controller, gives very stable readings.

I have one of your ORP probes, waiting to connect it to the expansion box.

Tell me what you want me to try.

[boboxx]

can you see if setting the Operation Mode of the redox sensor to "Twooption controller" will fix your problem?

[almost]

It was allready in 2potition controller.

[boboxx]

have you tried changing it and setting it back?

[almost]

Just did it, nothing changed.

[Matthias]

A change of +/- 5 can be normal, it depends on several things, e.g. the flow.

If you incease the hysteresis the controlling should work without issues.

Where is the technical problem with it? Maybe I just don't understand.