Hi,
I wants to convert output raw value of AD4110-1 into degree Celsius for RTD 4W sensor.
Can some one pls help me for how to convert raw value into temperature?
Thanks,
Jaydip
AD4110-1
Recommended for New Designs
The AD4110-1 is a complete, single-channel, universal input analog-to-digital front end for industrial process control systems where sensor type flexibility...
Datasheet
AD4110-1 on Analog.com
Hi,
I wants to convert output raw value of AD4110-1 into degree Celsius for RTD 4W sensor.
Can some one pls help me for how to convert raw value into temperature?
Thanks,
Jaydip
Hi,
The conversion of raw data of AD4110-1 into degree celsius will depend on the RTD sensor,Sense Resistor, PGA and the configuration being used. The sensor would have the transfer function which needs to be multiplied for the conversion.
Please refer to page 30 for more information on RTD Mode in AD4110-1. https://www.analog.com/media/en/technical-documentation/data-sheets/AD4110-1.pdf
Thanks
Vikas J
Hi,
Just to add. You have to get the equivalent resistance measurement of the RTD in order for you to calculate the equivalent temperature using the RTD transfer function. The Callender-Van Dusen equation, gives a more accurate result. So I suggest you can use it.
Please refer to this Circuit note for the equation. CN-0383 (Rev. C) (analog.com)
The RTD transfer function can be used directly from this. However, the RTD resistance measurement from code is different from AD4110 as it uses a different scheme. So Ideally you just need to convert the measurement code in voltage and divide it with excitation current. But as Vikas stated it depends on the selected excitation current, PGA settings, etc.
Thanks,
Jellenie
Hi Jellenie ,
Thanks for the answer!
The Callender-Van Dusen equation is helpful for RTD conversion.
is this equation use for Thermocouple conversion also or not?
Thanks,
Jaydip
Hi Jellenie ,
Thanks for the answer!
The Callender-Van Dusen equation is helpful for RTD conversion.
is this equation use for Thermocouple conversion also or not?
Thanks,
Jaydip
Hi,
The TC have different transfer function. We also have reference circuit for this. Ideally you need an external CJC for TC. Here's the circuit note to guide you through. For TC we usually used some kind of a look up table from the NIST website depending on the type of and temperature range.
Thanks,
Jellenie