I want 4 wire precision and I don't see if the CN0349 is capable of it.
hi Thomas: the analog signal chain of CN0349 is: AD5934 Vout -> AD8606 buffer -> sensor -> AD8606 I-V convert -> AD5934 Vin.
For the 4 electrodes conductivity sensor, the general usage is to apply the excitation current on the outer electrodes and measure the voltage from inner electrodes. So if you insist to use AD5934 as 4 electrodes conductivity sensor applications, you need to design the analog signal chain by your self to generate the excitation current and measure the inner electrodes voltage output.
I think that you might want to take a look at our CN0359, which allows for both 2-wire and 4-wire conductivity cells.
Hope this helps.
Thank you for your answer Brandon but I want to use the CN0349 because of the AD5934. I know the CN0359 can perform 4 wire mesure but the CN0349 is more practical for me.
Thank you Robert, finally I will use the CN0359 but I need to know if I can configure the parameters (cell constant, excitation voltage/frequency and temperature coefficient) with the RS 485 connector and send conductivity data to a microcontroller.
Hi Thomas: for now the CN0359 have RS-485 hardware interface, but you need to add the communication function by yourself according your protocol.
You have direct access from the RS-485 terminal block on the CN0359 that connects directly to the data in/data out of the UART. So you should have access to the ADuCM360 and any functions that can be controlled from the UART. I would read the ADuCM360 datasheet UART sections to determine what can be controlled from the UART.
ADUCM360 Datasheet and Product Info | Analog Devices
Perhaps if Robert know more specifically he can let you know.
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