How do I plumb my low differential pressure transducers?
Differential pressure transducers compare the pressure in one space to the pressure in another space. The difference between the two spaces is called the differential pressure. Low differential pressure is typically expressed in inches of water column ("WC), inches of mercury ("Hg), or Pascals (Pa).
The space that you want to monitor is always plumbed to the HIGH or POSITIVE port. The space you want to reference that against is plumbed to the LO or NEGATIVE port.