Arrow AutoCAT 2 Series Operating Manual page 168

Status Code Description
TL FOS electronics
outside of operating
temperature
BL FOS is measuring
Barometric pressure
outside of operating
range
RE Ratiometric error
PL FOS is measuring
outside of pressure
range
IE Instrument Error
EO Excessive offset:
Zeroing procedure
resulted in a
difference of greater
than 25 mmHg from
factory Cal
LT Loading Cal Table
SZ Sensor Zeroing
RS Communication
failure
ST Self Test: Ongoing
Ongoing self test
which does not
complete
8 . 1 : C o m m o n O p e r a t i o n a l P r o b l e m s
FOS Status Codes (continued)
Possible Alarm
AP FOS Signal
Out of Range
AP FOS Signal
Out of Range
AP FOS Signal
Out of Range
System Error 8 or
No alarm
None
None
None
System Error 8
System Error 8
8 . T r o u b l e s h o o t i n g
Possible issues
*FOS warming up at start-up
*FOS heating circuit failure
*Loss of power to FOS electronics
*Air conduit blocked
*Altitude exceeds 10,000 ft
(3050m)
*FOS electronics failure
*Incorrect calculations
*CAL key may be damaged or
corrupt
*Possible FOS PCB failure
*Excessive pressure on sensor
*Sensor has been damaged
*Unspecified error or
communication error
*Zero was not completed
properly or occurred when the
sensor was disconnected or
partially connected
*If it goes away within 10
seconds, no problem
*If it stays longer and the zero
does not complete, the key may
be damaged, corrupted or the
ribbon cable may be
disconnected
*None unless longer than
1 minute (See FOS does not
zero section of troubleshooting)
*FOS electronics failure
*FOS electronics failure
Troubleshooting the AP FOS signal
8-7