Printable View
Hi
I was wondering why the min deviation for the ph alarm is 0.5
Does this mean I can only set an alarm if the ph swings from say 8.3 (my nominal value) to 8.8?
If so this seems like a very large swing before an alarm is triggered. Is there no way to set the alarm deviation to say 0.15?
I have also noticed that the minimum hysteresis for the ph is 0.1
is there no way of setting this lower to 0.02 for example?
the alarm deviation is for + and -
which means you have a swing of 2 x deviation, in this case pH 1
-> I think there is a problem if the value swings so much
if it swings really so much than the alarm makes no sense in my opinion, it should be switched off then
a hysteresis of 0.1 is already a very small value, reducing it even more increases the switching frequency of actuators (e.g. solenoid)
Thanks for this Matthais
Do you mean the alarm would trigger anything over 0.25 + or - the nominal value? If so, that is fine.
With regards the to the hysteresis, I wanted to dose a ph buffer using the dosing pump if the ph fell 0.02 below 8.3 (ie 8.27) so that i could keep the ph constant at 8.3.
Do you think i am being too accurate here? I am new to the hobby and thought that the more stable i could keep the ph the better for my corals and my anemone
I am not quite sure what this means?Quote:
Originally Posted by Matthias
the complete measurement chain (probe + electronics) has a latency and it takes some time until the water and the buffer is mixed, so it is no possible to react as fast as you want in this example -> does not work what you planned to do
alarm deviation of 0.5 means +0.5 and -0.5 -> please check the manual for that
Ok Thanks for this advice!