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Convert 0...10V to pH5...pH9

Created by: Arne at: 7/4/2007 8:10 AM (6 Replies)

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7/4/2007 8:10 AM	Rate (0)
Arne Posts: 22 Rating: (0)	Hi, I reasently started working with the Logo. I'm trying to have the Logo display a pH value. I already build a converter to convert the signal from the probe (pH5...pH9) to a 0...10V. Now I want to display the pH value on the Logo display: 0V->pH=5,00 to 10V->pH=9,00. I already tried to get it working, but must be overlooking something... Can someone help me? BTW, I'm working with Logo!Soft Comfort 5.0.21 and a Logo 12/24RC with 2 analog inputs... Thanks, Arne.
Arne Posts: 22 Rating: (0)	Last edited by: Arne at: 04.07.2007 08:12
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7/4/2007 5:10 PM	Rate (1)
rosa Posts: 191 Rating: (58)	Please attach your program... you cannot enter the 5 and 9 limits, you have to enter them as 50 to 90 with 1 digit to the decimal point or 500 to 900 with 2 digits to the decimal point... hope this helps!!
rosa Posts: 191 Rating: (58)
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7/4/2007 8:21 PM	Rate (0)
Arne Posts: 22 Rating: (0)	Hi Rosa, Thanks for the answer! Well, this is what I have now, with the help of Mephisto. It seems to work but I still don't understand how this will work live. During the simmulation the input values go from 500 to 900... Do they still corresponse with a sensor of0 to 10V ??... This is where I can bang my head to the wall, I just don't completely understand the simmulation... The same problem with a temperature sensor PT100. I cannot seem to understand the input values... Don't ask me what the output will be at a temp of 20degC... Maybe you can help me a little rosa? Thanks! Kind regards, Arne. Attachment pH.zip (1062 Downloads)
Arne Posts: 22 Rating: (0)	Last edited by: Arne at: 04.07.2007 20:21
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7/5/2007 1:47 AM	Rate (2)
rosa Posts: 191 Rating: (58)	OK!! lets see if I can be clear... an analog input is converted internaly in a value betwen 0 an 1000 where 0V is 0 and 10V is 1000... when you program the analog function you change the values, you can change the 0 an make it a 500 ( Offset changes ) and you can adjust the 1000 ( or 1500 with the offset ) to make it a 900 ( gain changes ) now 0V is 500 and 10V is 900 if you simulate, the input shows 2 values the upper value shows your process value ( 500-900 ) the lower value shows the internal value ( 0-1000 ) now all you have to do is to program your LOGO! and install a sensor or a 0 to 10V source.. when the sensor delivers 0V the LOGO willdisplay 5.00 when the sensor delivers 5V the LOGO will display 7.00 when the sensor delivers 10V the logo will display 9.00 tell me if this helped... regards!! ROSA
rosa Posts: 191 Rating: (58)
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7/5/2007 12:31 PM	Rate (0)
Arne Posts: 22 Rating: (0)	Hi Rosa, Yes, this helps, thanks! Rosa, how does this work with a temperture-sensor PT100? I know there are PT100 with a range of -50...200degC, but you also have them with a range of -30...180degC... And how about when you are not sure about the output of such a sensor... Is there a way to simmulate then? I have aAM2 PT100 module and made a little test, but the displayed resolution doesn't seem to be that wonderful When I change the parameters and set theresolution to 1.0 it looks like the displayed value is more "precise" then a set resolution of 0.1... You cannot change that much because when you select a PT100, most parameters are preset. But it looks kind of silly when you see the display jump to another value like that. And please don't ask me what the displayed value will be at a temperature of i.e. 22 degC. Hope you can help me a little more... Kind regards, Arne. Attachment temp.zip (1051 Downloads)
Arne Posts: 22 Rating: (0)	Last edited by: Arne at: 05.07.2007 12:40 Last edited by: Arne at: 05.07.2007 12:39
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7/6/2007 12:45 AM	Rate (1)
rosa Posts: 191 Rating: (58)	Hi!! The PT100 works more lesthe same than the 0-10V... the complete range -50 to 200ºC is divided in 1000, therefore your best resolution will be 0.25ºC in the simulation -500 = -50ºC= 0 internal value 2000= 200ºC = 1000 internal value Pt100 are resistors that vary with temperature and always have the same values 100 ohm at 0ºC 139.26 ohm at 100ºC 175.84 ohm at 200ºC hope this helps!!! and please dont forget to rate the answers if they helped.... ROSA
rosa Posts: 191 Rating: (58)
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7/6/2007 8:14 PM	Rate (0)
Arne Posts: 22 Rating: (0)	Hi Rosa, Thanks! It's a little more understandable for me now. I'll try to play around a little with some easy to understand parameters so I can get used to it a bit more... Thanks again Rosa! Kind regards, Arne.
Arne Posts: 22 Rating: (0)
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