There is that possibility that one may use two different types of refrigerant(gas) with a particular manifold gauge ,so, how best can one flush his/her gauge?
you can use pretty much any gauges, however specific gauge sets have the pressure/temperature charts on the gauge face. that being said i use my 12-22-502 gauges for 134 and 12. a good practice is purge your gauge set prior to and after each use. for example once you connect your gauge set to a system. crack open the hi/low side gauge one at a time at the base of the gauges for a second to purge air from lines. this will reduce the chances of air getting into the system. you should also do this at the yellow line once the refrigerant tank or can is connected.
Gauge here means the ducts and the hoses and You don't want any residue or debris from one gas to contaminate the other.
correct, to be absolutely sure you could use compressed nitrogen to flush the gauge set as well. just make sure its regulated to around 40 psi
Compressed nitrogen is never available whenever i try to purchase same, is there anything else i could use ?
You'll need your own bottle. It's the same as if you had a welder or cutting torches. You can get bottle and nitrogen from a welding supply store.
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