ITT SMART SWITCH 801P5 - Manual (Page 35)

Page 31 801P5 Smart Switch TM
NOTE
NOTE
Pressure Calibration (PCAL) or Analog Output
Calibration (4Cal) is incorrect.
If you change the value for pressure or analog output
calibration more than 4% of the F.S.O. from the original
factory values, this error occurs. Contact Neo-Dyn Customer
Service for assistance.
If the power to the unit is turned off and then back on, the unit
will function using the new values. However, this is not
recommended, as a calibration error this large indicates imminent
component failure.
Display shows HHHH
This indicates that the unit is online and monitoring pressure, but
the pressure is at or greater than 110% of F.S.O. When the
pressure returns to less than 110% of F.S.O., the display will
return to its normal pressure display.
Display shows LLLL
This indicates that the unit is online and monitoring pressure, but
the pressure is less than 4% of the F.S.O. below zero psig (pulling
a vacuum). When the pressure returns to greater than 4% of the
F.S.O. below zero psig, the display will return to its normal
pressure display.
An unlikely possibility is that the pressure transducer's connector
has been dislodged from the internal circuit card. Check to insure
that the transducer connector is indeed connected. Contact
Neo-Dyn Customer Service for assistance.