Ph Adjustment

[AJ123]

I am trying to write a sequence so that I can have DAQFactory read the pH of some water, then based on that pH turn on a pump that will have either a base or an acid depending on which direction I am going. I am not sure where to start. If this is a logging problem or if I can write a simple while sequence.

What i have is a labjack U3-HV connected to a pH probe in my sample.

I am pretty new to scripting

[AzeoTech]

You'll actually want to put the script in the channel that holds the pH. I'll assume its called pH. The script might be something like:

if (pH[0] < 5)
  basePump = 1
endif
if (pH[0] > 10)
   acidPump = 1
endif
if ((pH[0] > 6) && (pH[0] < 9))
   basePump = 0
   acidPump = 0
endif
[/CODE]

[AJ123]

I am having an issue getting the pH probe to actually read a value in DAQFactory. I went through the labjack streaming panel and I saw that it is all hooked up correct and that I have the correct channel as the voltage changes when I change to different know pHs. I have it set up as a channel in the page with everything labled, channel name the device but I can't get it to actually read any values. I have it set as the I/O type as a Dig In is that correct?

[AzeoTech]

No, it is almost certainly an A to D input. Dig In would be 0 or 1 only (digital).