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Toolebox

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  1. Thanks for the additional info! ill use the sensor i have and add a pipe and cool the pipe if needed. Thanks again for your help! -Ryan
  2. Joe, Thanks! Here is a link to the sensor I am using http://www.sendo-sensor.com/pro1/19_100.html. the specs show it is rated for the temperature, but maybe it cant handle heat variance well? I do have a Dwyer 673-2 pressure sensor kicking around I could hook up via silicone tubing for an air gap, but figured that the one mentioned above mounted directly would be much more sanitary / easy to clean. Do you believe that I would have the same issue with the Dwyer sensor raised above the kettle, but connected to a fitting at the bottom of the kettle via silicone tubing? I could always use that until I settle on a better sensor that can handle temperature differences better? Otherwise, I will attempt to extend the Sendo sensor out via a copper pipe and come up with some sort of cooling. Really appreciate your help. -Ryan
  3. I am currently working on a project for my home brewery using a V350-35-ta24. In my boil kettle (15 gallons), I am using a fairly cheap direct screw in 4-20ma pressure sensor to calculate water volume using linearization to convert the value to gallons. This works well, until i start to heat the boil kettle. The pressure sensor value increases based on temperature increase, which will throw off other calculations i intend to implement down the road. I have attached my project. If you look at the first net in the main routine I have compensated for this by adding a second linearization based on the difference in gallons between cold starting water temp and 200 degrees F, then subtracting this number from the original value to find actual volume. This is obviously not perfect, as i assume different volumes of water will have slightly different results, but was the best i could come up with to get things close. The volume is also used for safety checks, to make sure that the heating element contactor turns off when there is not enough water. So its important that its as accurate as possible I am new to PLC programming. when you look at my project you may find things are not done perfectly, but everything is labeled well and currently working other than the volume is less accurate than i would like. What is the best way to compensate for the temperature change to keep the volume measurement consistent? Any advice would be greatly appreciated! V350 Brewery.vlp
  4. I was able to resolve this, After checking jumer settings again i found that i had JP11 set to digital instead of CM.
  5. I am new to Visions PLCs and am working on connecting a 3-wire PT100 sensor to a V350-35-TA24 PLC. I always receive a reading on my HMI of 32767 weather the sensor is connected or not. Hardware: I am confident its wired properly (per the manual). I tested the sensor on an old PID controller just to make sure the sensor works and it displays the temp properly. The resistance is roughly 108 Ohms when measured with a multi-meter at room temperature. I am currently using Analog Input 0, but have also tested it on Analog input 1 with the same result. I have also triple checked the jumpers and they are set to PT100 per the manual. The two wires that have continuity are wired to analog input 0. The other wire is connected to CM. Visilogic: I have basically nothing in my ladder and have just enough HMI configured to display MI 1 as a variable:numeric. This always results in a value of 32767. I have the correct hardware selected in the HW Configuration. Visilogic HW configuration: Analog input 0 - Type PT100 (Alpha = 0.00385) No Filter Op:MI Addr:1 Initialize during powerup: yes Any help or pointers in the right direction would be greatly appreciated! Assume I only have very basic knowledge of the visilogic software and any or its quirks. I also added the project in case that helps. Thanks in advance! ABC-1002.vlp
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