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Conductivity Cell

Created by: LeandroSa at: 6/20/2020 4:08 AM (10 Replies)

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6/20/2020 4:08 AM	Rate (0)
LeandroSa Posts: 7 Rating: (0)	HelloFolks, I was research in this forum some topics about my needs, that it is measure the water conductivity using LOGO. I have two options of instrumentation, to use conductive cell with 4 wire or to use a tow pieces of stainless steel with electrical resistance known. The point is, somebody know if there a Siemens module for convert electrical résistance at 4-20 signal? Would amplifier isolation be a solution for this?
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6/20/2020 4:45 AM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 12/22/2024 Posts: 34442 Rating: (4294)	The LOGO! has no module for direct resistor evaluation. The AM2 RTD module is designed for the evaluation of a PT100 / 1000 resistor. Only the resistor value of the PT is evaluated in a range that corresponds to a temperature range from -50 to 200 °C. What exactly do you want to do? Do you have a link or a data sheet for the Conductivity Cell?

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6/21/2020 12:13 AM	Rate (0)
LeandroSa Posts: 7 Rating: (0)	Hi Ixo65, Thanksforyou answer. So, basically, I need measure the water conductivity in two parts of the filtration process for apply a calculation. Depending of this result, the pump increase or decrease the rotation, and some solenoids open or close. The both value (conductivity 1, conductivity 2 and calculate result) should be available on the IHM. Thanks so much. Attachment TDS CALCULATON.jpg (306 Downloads)
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6/21/2020 6:14 AM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 12/22/2024 Posts: 34442 Rating: (4294)	ixo65 Do you have a link or a data sheet for the Conductivity Cell? My main question remains unanswered. Without knowing the exact data of the sensor, I cannot tell you whether the LOGO! can process its output Signal.

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6/21/2020 5:37 PM	Rate (0)
LeandroSa Posts: 7 Rating: (0)	Right. In attachment the datasheet of the cell. We have other options but this is apparently more adequate for our application. Attachment EMEC-ECDI-Probes-PVDF-body-SS-Electrodes-Data-Sheet-R1-07-10.pdf (305 Downloads)
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6/21/2020 6:19 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 12/22/2024 Posts: 34442 Rating: (4294)	In this data sheet is nothing to read which output signal. This sensor has no transmitter. You can not use it for the LOGO!

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6/21/2020 9:44 PM	Rate (0)
LeandroSa Posts: 7 Rating: (0)	I found transmitters that emit a 4-20mA signal but that significantly alters the costs. Another option I found via aliexpress but these Chinese products do not bring me any solid documentation, dubious quality and no guarantees. This weekend I sent e-mails to companies that work with isolating amplifiers, I will probably only receive a reply next week. With these modules I intend to convert the electrical resistance of the cells to a 4-20mA signal. One other way is to use a Burket cell (no cheap but could be one alternative) there more inforamtion on the datasheet. Could tell if there solutions for LOGO using this cell model? Attachment DS8220-standard-EU-EN.pdf (289 Downloads)
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6/21/2020 9:56 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 12/22/2024 Posts: 34442 Rating: (4294)	The LOGO! can't process sensors without transmitters because they have no output signal 0-10V or 0/4-20mA. The LOGO! base module can only process 0-10V signals directly. With a 500 ohm resistor, the base module can also process 0/4-20mA signals. The analog expansion module can evaluate both, 0-10V and 0/4-20mA directly. The expansion module AM2 RTD is required for PT100 / 1000.

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7/10/2020 7:48 PM	Rate (0)
LeandroSa Posts: 7 Rating: (0)	Hello, I found a conductivity cell that is compatible with our idea, it seems to me that there is no LOGO module that converts the electrical resistance of the cell into a 4-20mA or 0-5V signal. However, I would like to know if for Siemens there would be any other PLC model that could have a module that would make this conversion. Could you tell me? Regards, Leandro Attachment elettrodi_inox_ita.pdf (286 Downloads)
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7/10/2020 8:06 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 12/22/2024 Posts: 34442 Rating: (4294)	I don't think that Siemens has any PLC that can convert the resistance Conductivity Cell. Conductivity Cells are very difficult sensors and need special converters. Why do you not contact the manufacturer of the sensor (www.emec.it)?

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