Automation Lab

>Temperachur meter, Oil Bath, Pressure pump

I have to confess that I'm not sure what an automation lab is, but the items you listed are typically associated with a calibration lab.

If you're intending to do calibrations, and that the cals need traceability, you need to consider equipment which you can readily have certified with a reasonable turn-around. Getting a device that requires 2 or 3 months for the annual certification and lots of bond or duty expense because it has to be shipped overseas can stress a lab's productivity. In other words, what's the support for devices you need?

You need to determine whether the calibration cert that comes with the device meets your reporting requirements (some are nothing more than certificates of conformance, without any cal data).

Calibration instruments need to have an accuracy spec 1/4 of the accuracy spec of the device being calibrated.

I can't tell you what you need for calibration, it depends on what kinds of modules or instruments need calibrating.

If you really intend to repair PLC I/O modules you'll ikely it'll be a frustrating experience, given the lack of published service manuals/documentation. Good luck with that.

The PLC I/O calibration I'm familiiar with is done with the modules in the rack. I see people use a 'spare' PLC rack used for simulation and project development, but that's more on the engineering side than testing, repair, or calibration.