Auto-zero

The auto-zero sequence can be initiated by any of the following:

  • Commanding BACnet object properties
  • Configured time delay
  • APS power on or return from power loss

The auto-zero sequence automatically adjusts the internal offset for the differential pressure sensor.

Reliability states

The APS reports all reliability states to the DXR2, including:

  • BAD_CALIBRATION
  • BAD_TRANSDUCER
  • LOW_PRESSURE
  • HIGH_PRESSURE
  • CAL_IN_PROGRESS
  • RESET_OCCURED
  • BAD/NO COMM
  • COMMUNICATION_FAILURE

LED Indication

Air sensor calibration blink pattern takes precedence over the communication blink pattern.

LED State

Status

Green – solid

Running, no communication

Green – blink 80/20

Running, communication ok

Green – blink 50/50

Air sensor calibration mode

Red – solid

Error condition