GHL KHD Reading Low

[Not an IT guy]

Run it again. If you get that same range then it is correct. If you want to be precise you can run it a third time.

 

[Cheesus]

Yeah it is a constant 6.8 but my tank is at a 7.7 because I had a dosing pump go crazy on me earlier today...so that was fun.

Not sure of any other reason I would be reading so far off. If the heads were worn out some even after calibration would that cause an issue like this?

 

[Not an IT guy]

The only thing I can think of is the heads speed? Did you check how much each pump head distributes during calibration?

 

[Cheesus]

yeah I did the calibration with a test tube, recorded the numbers and saved it.
I am super confused.

 

[Not an IT guy]

See any air bubbles in the reagent line?

 

[Cheesus]

None, the reagent sits directly under the doser.
I did just change that though, it was sitting to the side, running a test now.

 

[Not an IT guy]

Flush the reagent line before. You want zero air bubbles in that line. Do you hear a pop when the test begins?

 

[Cheesus]

Yeah I do actually, No idea what it is. The test came back at 6.8 again..lol

 

[Not an IT guy]

It’s the pinch valve Normal. I mean you are getting consistent results. Maybe calibrate the probe again. Also make sure you refill with some saltwater since you’re spending 80 mls a test. If your rodi is running you don’t want to drop your sg

 

[Cheesus]

It’s the pinch valve Normal. I mean you are getting consistent results. Maybe calibrate the probe again. Also make sure you refill with some saltwater since you’re spending 80 mls a test. If your rodi is running you don’t want to drop your sg

Yeah I have the free dose head dosing 80 ml of saltwater lol

I can try that out tomorrow, Its a pain to calibrate.

 

[Cheesus]

It’s the pinch valve Normal. I mean you are getting consistent results. Maybe calibrate the probe again. Also make sure you refill with some saltwater since you’re spending 80 mls a test. If your rodi is running you don’t want to drop your sg

Hey what is your firmware version? Mine is from 2020 I think

 

[Not an IT guy]

Hey what is your firmware version? Mine is from 2020 I think

Mine is version 1.00 I don’t think there is an updated version

 

[LOVEROCK]

Where exactly do you measure for the sample tube volume or how many ml” , from
The filter to tube inserting into the dosing beige tubing ?

 

[Cheesus]

Where exactly do you measure for the sample tube volume or how many ml” , from
The filter to tube inserting into the dosing beige tubing ?

You measure all of it, from the sump all the way to where it goes into the KHD.

 

[Cheesus]

Mine is version 1.00 I don’t think there is an updated version

So this morning I recalibrated the sample line, recalibrated the probes, same results.

I saw something about moving the filter to the sump, so I cut new sample lines and when I went to put the filter on I noticed that it said honda..interesting. Decided to test without it, and have had the closest reading yet, KHD 6.6 Salifert 7.1.

I just ran one test but there's one on the schedule for 12 ill let run and see if it improves.

 

[Cheesus]

Aaaand it went back down to 6.2. I put in a support ticket yesterday so
Hopefully I’ll hear something soon. This is incredibly frustrating.

 

[Not an IT guy]

Aaaand it went back down to 6.2. I put in a support ticket yesterday so
Hopefully I’ll hear something soon. This is incredibly frustrating.

I know the feeling. Once it gets sorted out it will be a dream feeling.

 

[Cheesus]

I hope so. Any other suggestions I can do?

 

[Not an IT guy]

I hope so. Any other suggestions I can do?

You can open up the box and double check that the reagent line has no air bubbles. Also make sure the end of the line that goes into the bottle isn’t getting stuck to the bottom of the bottle in a vacuum. To me it seems there isn’t enough reagent getting into the sample. Or too much sample. How big is your tank?

 

[Cheesus]

That’s an interesting theory. I’m gonna go test that. It’s a 125 with probably a 30 gallon sump