Why is my low differential pressure transducer not giving me the output I'm expecting?

• If the unit seems to be "reading" the opposite of what is expected, check that it is plumbed correctly: 
  • the space to be monitored is plumbed to the HI port and the reference space is plumbed to the LO port.
• If the output seems to be twice or half of what it should be, check the range of the unit: is it bi-directional or uni-directional?
  • the output signal is proportional to the pressure range
• Where are you reading the signal from?
  • Check the output directly from the transducer
    • there might be a issue with how the PLC/BAS system is reading the signal
• Try to zero the instrument
  • pull the instrument off the system and let it hang in the air
  • leave both ports open to atmosphere or with place a jumper tube over the high and low port and put a little pin prick in the tube
  • follow the "adjust zero" instructions in the operating instructions for that transducer
    • All operating instructions can be found on the website