KH Director not giving me a dkh reading

[Paullewis]

Following on from emails please see screen shots attached
10177
10178

[Matthias]

ok, we see in the screenshot "alarm: range"

this means the KHD started to measure but it took too long to come to a reasonable measurement value

when does this happen?

a) reagent doesn't reach the KHD - check if reagent is pumped into the KHD during measuring and that there is no air pumped

b) dosing calibration values are incorrect, in this case KHD is not able to calculate correct amounts resp. a correct KH value - check if calibration and settings of all 3 KHD involved pumps are correct
post screenshots of these 3 pumps here

[Paullewis]

Reagent has no air in the tube and is reaching the Doser ok.
I will calibrate the Doser and try again.
Thanks

[Matthias]

probe and waste pump shall have about 36 ... 37ml/min at speed 3
reagent pump approx. 4.5ml/min at speed 0

[Paullewis]

Pump 1 is 34ml/min
Pump 2 is 4.3ml/min
Pump 3 is 33ml/min

Still getting 0,0 and alarm error.

[Matthias]

flow seem all a bit low to me, but this is not the reason for this behaviour

which speeds are selected? please post screenshots of all 3 pumps

another thought: you did calibrate the pH-electrode, and the calibration was fine at the end? you used fluids pH 4 and pH 7 in the right order?

[Matthias]

and please deactivate "alarm monitoring" until we found the reason for your issue, maybe there is also another message displayed in the status field

[Paullewis]

101851018610187

Yes PH probe was calibrated using the 4 and 7 solutionss that were supplied

[Matthias]

filling level of reagent pump (2) must be at least 50ml to start measurement, screenshot shows zero

[Paullewis]

10188101891019010191

[Matthias]

pump 2 filling level is still zero

and again:
and please deactivate "alarm monitoring" until we found the reason for your issue, maybe there is also another message displayed in the status field

[Paullewis]

Still the same, seems to go through the motions of a test but never gives a reading?

[Matthias]

Hm, it becomes difficult.

1. please deactivate alarm monitoring (uncheck both options)
2. tell me what the status field shows AFTER this deactivation
3. show me a NEW screenshot of pump 2

after this is done:
describe please exactly the measurement cycle
is it only getting sample water and after that it is IMMEDIATELY drained trough the waste line
or is there a measurement between? how long? getting sample water should take about 2-3 minutes, draining 2-3 minutes, and the actual measurement process between about 5-10 minutes

if there is no measurement then
a) there arrives no sample water
b) the pH electrode calibration was not OK

BTW: the pH-electrode is plugged in the right BNC port, not in the doser BNC, right?

better also post a few pictures of your entire setup, front and rear so I can see all tubes and wiring

[Paullewis]

Sorry I took screen print quicker than the GHL software could refresh.1019210193
10193
Status ok, no alarms ?

[Matthias]

then there is only one thing left: the pH-measurement is not correct
there are a few reasons I could think of, I already mentioned them above

our support team will continue to take care of you tomorrow morning

[Gael]

Pump 1 is 34ml/min
Pump 2 is 4.3ml/min
Pump 3 is 33ml/min

Still getting 0,0 and alarm error.

As I also have low values on some pumps, I tell myself that maybe the containers we use to measure the amount of water pump during calibration are not accurate or reliable. Maybe that it would be necessary to provide a reliable and calibratoed containers with Doser2 that guarantees the value of calibrations. As before, KH Director, it was not very important, but with the KH Director, it's very.

[Matthias]

As I also have low values on some pumps, I tell myself that maybe the containers we use to measure the amount of water pump during calibration are not accurate or reliable. Maybe that it would be necessary to provide a reliable and calibratoed containers with Doser2 that guarantees the value of calibrations. As before, KH Director, it was not very important, but with the KH Director, it's very.

I use a precise letter scale (0.1g resolution) for calibration

[Gael]

I use a precise letter scale (0.1g resolution) for calibration
Ok, thank, just bought this: http://www.steinbergsystems.de/de/sbs-lw-50010-ws/

[reeffever]

Matthias,

I am having the exact same issue with my KH Director. I have been talking to Vinny@GHL USA about it and just saw this post.


Here is my issue forwarded from my email to Vinny....



Vinny,

Ok, so after getting home and testing things out. Pump 1 on the Dosing unit is no longer seizing up randomly. It’s working fine now.

Here are some pictures of my settings for pumps 5, 6, and 7, for the KHD. Whether I run the KHD as a “timed” measurement or a measurement which I choose the same result happens. The chamber on the KHD flushes, then drains, then fills again… instead of adding KHD reagent here it discharges the chamber and finishes. I don’t get any error codes or messages and the status during the whole process is “Measuring.” Once it finishes discharging the status goes back to “OK.”

10222102231022410225

I went back over the instruction manual and I verified everything was correct. All of my dosing pumps, especially the KHD Dosing pump, are Firmware 1.28. I’m stumped.

[reeffever]

Matthias,

I am having the exact same issue with my KH Director. I have been talking to Vinny@GHL USA about it and just saw this post.


Here is my issue forwarded from my email to Vinny....



Vinny,

Ok, so after getting home and testing things out. Pump 1 on the Dosing unit is no longer seizing up randomly. It’s working fine now.

Here are some pictures of my settings for pumps 5, 6, and 7, for the KHD. Whether I run the KHD as a “timed” measurement or a measurement which I choose the same result happens. The chamber on the KHD flushes, then drains, then fills again… instead of adding KHD reagent here it discharges the chamber and finishes. I don’t get any error codes or messages and the status during the whole process is “Measuring.” Once it finishes discharging the status goes back to “OK.”

10222102231022410225

I went back over the instruction manual and I verified everything was correct. All of my dosing pumps, especially the KHD Dosing pump, are Firmware 1.28. I’m stumped.


In my haste and exhaustion the last few days I failed to notice that the pH probe was actually connected to the dosing unit. OMG! Bonehead moment!

I am going to connect it correctly and calibrate and see what happens.