Get Pneumatic Pressure

[tuXguy15]

The Pressure Switch (http://www.andymark.com/product-p/am-2006.htm) reads the air pressure in the system and tells the shuts off the compressor when 120 psi is hit by communicating with the Digital Sidecar. That is why you specify the relay and digital input output port when coding. The relay is for the compressor and the DIO is for the switch that gives a reading and shuts off the compressor when that reading hits 120 psi. I have seen other teams read the psi using that but i wanted to know how we can do it the same way.

[Domenic Rodriguez]

Here's the data sheet for the pressure switch: http://files.andymark.com/NasonSMspecs.pdf. Each sensor is factory preset to a certain PSI that can't be changed. It only outputs a digital/binary signal; it does not report the actual pressure to the cRIO.

[Joe Ross]

Originally Posted by tuXguy15

the DIO is for the switch that gives a reading and shuts off the compressor when that reading hits 120 psi. I have seen other teams read the psi using that but i wanted to know how we can do it the same way.

Have you looked at the methods for the compressor class?

[tuXguy15]

Thank you Joe! I don't know why I didn't start there but I found a way to do it. Thanks.

[Al Skierkiewicz]

Everyone, please understand that the 120 psi specification is not a hard spec. In my experience (watching during inspections) it is more likely 120 +3/-5 psi from unit to unit.

[Tristan Lall]

I wonder if it's the right time of year for the GDC to consider a 2014 rule allowing any pressure sensor rated for the pressure in the system at that point of installation. (If it would replace the switch, it would have to be rated against all failures; if it would supplement the switch, non-operation is not important, so it would need only be rated not to be pneumatically compromised in normal service.)