Combine a Yocto-PT100 with a YoctoHub-Wireless-g to get an autonomous appliance with built-in network connectivity:
The Yocto-PT100 is a USB temperature sensor. This is the most precise USB temperature measurement device that we offer. The module uses an external PT100 probe (not included) to make instant temperature measurements, and can also record measures on a built-in flash memory to read them later on through USB. A PT100 probe is used to measure the temperature at any specific place, including in a liquid, with a very high stability and a high precision (sensibility up to 0.01°C and precision up to 0.03°C at 0°C when using a PT100 conforming to IEC 60751 DIN 1/10 B standard). It is particularly well suited for applications such as laboratory measurements, etc.
The Yocto-PT100 can be used with PT100 probes using 2, 3 or 4 wires. The type of connection is setup in software. To reach the highest precision, a 4-wires probe should be used. 3-wires probes are reasonably precise and not too much affected by wire lengths, contrarily to 2-wires probes which are the least precise and very sensitive to wire length.
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The YoctoHub-Wireless-g is a wireless-enabled module that can host three Yoctopuce modules to access them remotely through a Wifi network (802.11g). It can be powered either by a USB Micro-B cable and a regular phone charger, or a 5V battery pack.
Three Yoctopuce modules can be connected directly, one of which can be fixed directly on the YoctoHub-Wireless-g and connected using a Board2Board-127 connector. More devices can be connected, thanks to the YoctoHub-Shield extension. The YoctoHub-Wireless-g can power Yoctopuce devices up to 2A.
This yocto-pt100 can be configure to measure a SPRT with constants that corresponse to ITS-90?
@jjarandato There are 3 aspects to this question:
1) the absolute precision
2) the resistance range
3) the format of correction factors:
Regarding 1, the absolute precision of this device has been verified to match the requirements for Secondary SPRTs (0.03°C), but we have not checked for a higher precision. If you really need 0.001°C, you will probably need a more precise device, I doubt we can be as precise in absolute value.
Regarding 2, this device applies the resistance-to-temperature function for PT100. If you need to use SPRT in the ~25 Ohm range, you could work from the measured resistance value (without using the internal mapping), but you will be out of the sweet spot of the device for resistance measurement and will probably loose a bit of precision
Regarding 3, the device features a built-in mechanism for 5-points linear calibration function, but not another more specific format
I'm curious if its possible to use your PT100 with 44212EC sensor without major modifications and to still expect 0.1C accuracy.
@tetaran: The 44212EC sensor is not a PT100, it is a combination of thermistors using different resistance values. It might be possible to read it using a Yocto-Thermistor, but I am not even sure as I have not digged into the magic of this thermilinear network...