New possibilities of testing for the GHL KH Director

[Lasse]

With FW 7.40 for GHL profilux 4 (GCC 1.1.5.0) comes new scheduling methods for KH/ION director. Before you could only schedule x times a day (up to 24) and for all days in a week. From this FW you can also use a timer in order to initiate a test, You use the event start mode in a timer of your chose. You can program up to 8 different start times and you can chose which weekdays it should test. You do not need to test every day nowadays. Its possible to only test once a week if you want that . For the moment I only dose between 20:00 in the evening to 10:00 in the morning (8:00 PM and 10:00 AM). I use adaption mode. Its rather useless for me to test between 10:00 and 20:00 because I do not dose and the KH is supposed to decrease during this time. During the period 20:00 to 10:00 I have a base dose that cover the calculated demand for the whole day. During this time I also run a very aggressive adaption. If the measured value is below the set point with 0.2 - the dose is doubled and if it is higher than 0.2 . the dose is zero - my goal is that I should have the same KH att 10:00 every morning - for the moment 8.4. Because of this I need to test often during the night and I have 7 test occasion between 23:15 and 09:15. but only one during the day - at 20:15. I need a test here because I start dosing 20:30.

I´m just in the test phase but it has work well during this first night

Settings

Result till now

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NOTE This FW update (to 7.40 and above) will reset your P4 to default. Its important that you have saved all settings and sensor data before the update. You need also to do new virtual probes if you have done such probes. For me - I had also to assign my PAB devices again. The boxes was unchecked after the update

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Sincerely Lasse

 

[BeanAnimal]

Thanks for the update Lasse.

 

[TCoach]

During this time I also run a very aggressive adaption. If the measured value is below the set point with 0.2 - the dose is doubled and if it is higher than 0.2 . the dose is zero - my goal is that I should have the same KH att 10:00 every morning - for the moment 8.4.

Lasse,

Thank you for this write up. I’m finally getting a chance to play with this over my holiday vacation.

Question, How is you doser setup to do this? Looking at mine, I don’t see a way with adaptive to do what you’ve said.

I’m at 8.8dKH tonight with an 8.5dKH goal. However, the doser still wants to dose. Like you, I’d really like to keep a tighter lid on my alk swings.

Thanks,
-Chris

 

[dschuffert]

Thanks for the write-up. I appreciate your sharing. I am now testing this on one of my systems!

 

[Lasse]

Because my director broke down shortly afterwards (I have still not get any new) I can´t show you the result - but i works well. My text can be missunderstand - I see that now. I wrote

If the measured value is below the set point with 0.2 - the dose is doubled and if it is higher than 0.2 . the dose is zero

This means that - in your case (its your picture) - the deviation actual value to normal value should be set to 0.1 - not 0.2. ±0.1 is the death band - nothing happens before its over a deviation of ± 0.1.

I do not remember my settings off adjust each dosing by this amount. You have to play with that number.

My systems turn around is lesser than 15 minutes (turn around = the time it takes for total mixing) - in my case the volume is around 300 L and my return pump gives 1500 L/H. My pump is therefore scheduled to dose 15 minutes before the tests start and wait at least 45 minutes before next dose (it take around 30 minutes to complete the test) This means that it should dose once an hour. If my event start xx.15 - the dose should be around xx.55. Its also means that my writing in the original post

20:15. I need a test here because I start dosing 20:30.

is wrong - it should be

20:15. I need a test here because I start dosing 20:55.

Sincerely Lasse