There are temperature sensors which are powered the following expensive supply: http://www.prelectronics.com/pdf/2222-2476-US.pdf Here it is mentioned: "The power supply is based on primary switchmode technology to achieve a high efficiency." and "Galvanic isolation between the primary and the secondary voltage is achieved through the double-isolated safety transformer."
I need to install a new system with new sensors and need a new power supply. I found a cheaper power supply which has the data-sheet: http://docs-europe.electrocomponents.com/webdocs/0802/0900766b808023f1.pdf
Someone used the first power supply model I linked and I don't know if there was a specific reason for that power supply. I'm guessing for transducers like temperature sensors the isolation, ripple voltage ect. might be important.
I have couple of questions:
1-) Is the cheaper power supply I found(second link) an SMPS? Because it is not mentioned.
2-) And again in the second power supply the Isolation resistance > 5MOhm. Does that mean there is good galvanic isolation?
3-) Would it be okay to use the cheaper one instead of the first one?
I'm asking because I'm wondering if there is something special about the first power supply(first link).