Fault Diagnosis With Test Functions - Teledyne T802 Operation Manual

Teledyne API T802 Paramagnetic O
WARNING
MESSAGE
RELAY BOARD The CPU cannot communicate with
WARN
SAMPLE FLOW Sample flow rate is < 80 cm
WARN
SAMPLE PRES
WARN
decreasing at 1 in-Hg per 1000 ft of
SYSTEM RESET

11.1.2. FAULT DIAGNOSIS WITH TEST FUNCTIONS

Note
A worksheet has been provided in Appendix C to assist in recording the
value of these test functions. This worksheet also includes expected values
for the various test functions.
07275B DCN6418
Analyzer Operation Manual
2
FAULT CONDITION
the Relay Board.
3
> 180 cm /min
Sample Pressure is <15 in-Hg or
> 35 in-Hg
Normally 29.92 in-Hg at sea level
altitude (with no flow – pump
disconnected).
The computer has rebooted.
In addition to being useful as predictive diagnostic tools, the test functions
viewable from the front panel can be used to isolate and identify many
operational problems when combined with a thorough understanding of the
analyzer's theory of operation (see Section 12).
The acceptable ranges for these test functions are listed in the "Nominal Range"
column of the analyzer Final Test and Validation Data Sheet (PN 068350000)
shipped with the instrument. Values outside these acceptable ranges indicate a
failure of one or more of the analyzer's subsystems. Functions whose values are
still within the acceptable range but have significantly changed from the
measurement recorded on the factory data sheet may also indicate a failure.
The following table contains some of the more common causes for these values to
be out of range.
2
I C bus failure
Failed relay board
Loose connectors/wiring
Failed sample pump
Blocked sample inlet/gas line
3
/min or
Dirty particulate filter
Leak downstream of critical flow orifice
Failed flow sensor/circuitry
If sample pressure is < 15in-Hg:
Blocked particulate filter
Blocked sample inlet/gas line
Failed pressure sensor/circuitry
If sample pressure is > 35 in-Hg:
Pressurized sample gas. Install vent
Blocked vent line on pressurized sample/zero/span gas
supply
Bad pressure sensor/circuitry
This message occurs at power on. If you have not cycled the
power on your instrument:
Failed +5 VDC power,
Fatal error caused software to restart
Loose connector/wiring
Troubleshooting and Service
POSSIBLE CAUSES
199