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I am working on an oil project and I am preparing some datasheets. I want to know differences beween vent and drain (if any) in instruments such as gauges?

Kind answers is appreciated.

Well, you vent trapped air/gases and you drain trapped liquids (depending on applications).

For example consider dP transmitter/gages--
for liquid applications, there is a vent screw/hole somewhere in the sensor body that may be used to release the trapped air/gases at the diaphragms of the sensor.

For gas applications, there is a drain screw/hole somewhere in the sensor body that may be used to release the trapped liquids/condensates at the diaphragm of the sensor.

Why do you want to vent and/or drain? Because the trapped gases or liquids may introduce errors in the sensor readings.

Vent goes up.
Drain goes down

HI,

Vent is generally for removal of air bubbles & Non condensable gases & drain to remove condensates like in pneumatic air.

Regards
Sushant Chanana

Hi
Thanks for your very useful information.