Conductivity Probe Calibration Problem

[shardyl]

Hi

I just calibrated my conductivity probe using the 50ms solution.

All went well but when i put it back in the solution at the same temp as the tank, I got a 49ms reading. I thought that was quite close but decided to calibrate again to see if i could get it more accurate.

I followed the same procedure again (but it had been in rodi water for about 5 mins) and this time the solution read 32.9ms!

I did it one more time and it still read 32.9ms. (wish i had left it alone!)

What have i done wrong? and how can i fix this problem?

thanks

[GHL Support]

You should simply repeat the calibration procedure.

[shardyl]

I have repeated the calibration process 4 times now and the reading of the fluid still comes out at 32.9-32.8

I have now ran out of calibration fluid.

could the probe be defective?

[GHL Support]

The first calibration went ok, didn't it?

Did you change anything before the second try?
Could you post the ADC (ADC1 / ADC2) values for the conductivity probe reported in ProfiLuxControl?
If you are using salt water with a ProfiLux3eX or ProfiLuxPlus2eX the range should set to salt water. If ProfiLuxControl shows Conductivity(S), the range setting seems ok.

[shardyl]

Yes the first one came out at 49 with the probe in the solution after the calibration

I left the probe in ro water and tried again

the ADC values were pretty constant during calibration with ADC1 at 19-20 and ADC2 at 449-451

The probe is set to sea water in profilux 3ex

[GHL Support]

Hm, the ADC values seems good - the higer value is perhaps a little low - but I have no reverence value now.

Which firmware version is running and which model do you have?
Did you a firmware update?

Maybe a solution:
save your settings and sensor data via PLC
make a factory reset on your ProfiLux
load the settings to the ProfiLux via PLC
check the ProfiLux settings
retry the calibration (you could reuse the calibration fluid for those tests - if the calibration went ok you could repeat it with fresh calibration fluid)

[akindbro4u]

I'm having the same problem. Readings of 32.8 after calibration.

sent from the bottom of the sea using tapatalk

[shardyl]

Just wanted to add that this problem was me being a total dumb ass!

You have probably got your reading set to the wrong type of measurement. i cant remember off hand what it was but when i changed the measurement reading type it turned out the probe was calibrated correctly!

doh!

[akindbro4u]

Fixed it. Very odd. Switch from salt, to fresh, and back. Now it works.

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