Teledyne GFC7000EU, Manual, Page: 6 / 9

MODEL GFC7000EU CO ANALYZER WITH AUTO-REFERENCE
(Addendum to GFC7000E Manual PN 04584)
05134 Rev -
6
Warning
Message
Fault Condition Possible Causes
FRONT PANEL
WARN
The CPU is unable to
Communicate with
the Front Panel
Display /Keyboard
WARNING only appears on Serial I/O COM Port(s)
Front Panel Display will be frozen, blank or will not
respond.

Failed Keyboard

I
2
C Bus failure

Loose Connector/Wiring
PHOTO TEMP
WARNING
PHT DRIVE is
>4750 mVDC or
<250 MVDC

Failed IR Photo-Detector

Failed Sync/Demod Board

IR Photo-Detector improperly attached to the
Sample Chamber

BENCH TEMP too high.
REAR BOARD
NOT DET
Mother Board not
detected on power
up.
WARNING only appears on Serial I/O COM Port(s)
Front Panel Display will be frozen, blank or will not
respond.

Massive Failure of Mother Board
RELAY BOARD
WARN
The CPU cannot
communicate with
the Relay Board.

I
2
C Bus failure

Failed Relay Board

Loose connectors/wiring
PURGE PRESS
WARN
Purge Pressure
outside of warning
limits specified by
PURGE_PRESS_SET
variable

Loss of purge flow

Failed purge pressure sensor

Purge pressure regulator not set properly
SAMPLE PRES
WARN
Sample Pressure is
<15 in-Hg or
> 35 in-Hg
Normally 29.92 in-
Hg at sea level
decreasing at 1 in-
Hg per 1000 ft of
altitude (with no
flow – pump
disconnected).
If Sample Pressure is < 15 in-HG:

Blocked Particulate Filter

Blocked Sample Inlet/Gas Line

Failed Pressure Sensor/circuitry
If Sample Pressure is > 35 in-HG:

Blocked Vent line on pressurized
Sample/Zero/Span gas supply

Bad Pressure Sensor/circuitry

Failed Permapure dryer
SAMPLE TEMP
WARN
Sample temperature
is < 10
o
C or >
100
o
C.

Ambient Temperature outside of specified
range

Failed Bench Heater

Failed Bench Temperature Sensor

Relay controlling the Bench Heater

Failed Relay Board

I
2
C Bus
SOURCE
WARNING
Occurs when CO Ref
is <1250 mVDC or
>4950 mVDC.
Either of these
conditions will result
in an invalid M/R
ratio.

GFC Wheel stopped

Failed Sync/Demod Board
If Status LED’s on the Sync/Demod Board ARE
flashing the cause is most likely a failed:

IR Source

Relay Board

I
2
C Bus

IR Photo-Detector
SYNC
WARNING
Phase Lock Loop
(PLL) has lost lock
on wheel rotation.

GFC Wheel stopped

GFC Wheel rotation very slow/dragging