ORP Calibration Fluid

[fencer]

Apex controllers require 2 points to calibrate. I wasn't sure if RKE's do. I think you can get cal soln form JLaquatics. But I was going to suggest Digital Aquatics. I can give a pH7 mixture...but you have to mix it on the spot( eg can't give it to you as a liquid form otherwise it will go bad)

[xtreme]

I'm no expert, but I don't think you use pH calibration solution for an ORP probe?

[fencer]

you use the pH soln to dissolve the quinhydrone.

The reading should be between +170 mV and +185 mV above the reading in
the 7 buffer mixture at room temp

[OceanicCorals-Ian-]

I have one package of ORP calibration fluid left, I will ship it for the cost of a postage stamp. It will fit in an envelope.

[michika]

Originally Posted by OceanicCorals-Ian-

I have one package of ORP calibration fluid left, I will ship it for the cost of a postage stamp. It will fit in an envelope.

I wish I'd seen this earlier. UGH! I'll try PMing anyways.


Fencer,

Tell me more about this? I'm very intrigued.

[OceanicCorals-Ian-]

Done!

[fencer]

Apex controllers require 2 points to establish a linear line (slope) over the range of operation. Just like pH calibrations are done. You cannot a proper calibration on one point...only bias the probe to read correctly. So as the reading deviate from the error increases. I think RKE's only use the one point calibration. Not sure if this is the answer you wanted.