Vega FiberFlex LFXG-H, Operating Instructions Manual

Page: 81 / 102

Diagnostics and repair
LFXG-H Installation and Operation Guide 79
Analog alarm
If the current loop output (analog output) is stable at 2 mA or 22 mA, the
analog alarm is set.
The analog alarm is set when the counts from the detector falls below a set
threshold, indicating that the detector is not outputting enough counts to
make a meaningful measurement. This is known as 0 counts.
If the analog alarm is on, verify:

Source holder shutter is in the On or Open position to create the
required radiation field.

Extreme build-up on walls or other material shielding the detector from
the radiation field.

Damage or disconnection of electrical connections from the sensor
assembly to the CPU board.
New hardware
found? – No/Yes New hardware found – The
CPU board detects a
configuration mismatch. The
CPU board or sensor
assembly may have been
replaced, or one of the
EEPROM configurations is
erroneous. Contact VEGA Field
Service. See 26.
Process out of
range? – No/Yes Process out of measurement
range – The current process
value is not within the limits
set by the Max level and Min
level in the gauge span
settings. Call VEGA Field
Service.
X-Ray Alarm – No/
Yes Note that there are high levels
of x-ray in your area that may
be affecting process
measurement. Contact VEGA for
further information.
Table 5.3
Diagnostic alarm conditions (continued)
Diagnostic check
and Normal/Error
conditions
HART message
Diagnostic description
Action