Detcon FP-524D INSTRUCTION MANUAL - Manual (Page 21)

Model FP-524D
FP-524D Instruction Manual Rev. 1.4 Page 17 of 39
as the display shows the sensor’s “as found” response to the span gas presented. If it fails to meet the
minimum in-range signal change criteria within 2½ minutes, the display will report “Range Fault” twice
and the sensor will return to normal operation, aborting the AutoSpan sequence. The sensor continues to
report a “Range Fault” and will not clear the fault until a successful AutoSpan is completed.
Assuming acceptable sensor signal change, after 1 minute the reading will auto-adjust to the programmed
AutoSpan level. During the next 30 seconds, the AutoSpan sequence checks the sensor for acceptable reading
stability. If the sensor fails the stability check, the reading is re-adjusted back to the AutoSpan level and the
cycle repeats until the stability check is passed. Up to three additional 30-second stability check periods are
allowed before the unit reports a “Stability Fault” twice and the sensor will return to normal operation,
aborting the AutoSpan sequence. The sensor will continue to report a “Stability Fault” and will not clear the
fault until a successful AutoSpan is completed.
If the sensor passes the stability check, the sensor display reports a series of messages:
“AutoSpan Complete”
“Sensor Life XXX%”
“Remove Span Gas”
d) Remove the span gas and calibration adapter. The sensor will report a live reading as it clears toward “0”.
When the reading clears below 5 % LEL, the sensor will display “Span Complete” and will revert to
normal operation. If the sensor fails to clear to less than 5% LEL within 5 minutes, a “Clearing Fault” will
be reported twice and the sensor will return to normal operation, aborting the AutoSpan sequence. The
sensor will continue to report a “Clearing Fault” and will not clear the fault until a successful AutoSpan is
completed.
NOTE 1: If the sensor fails the minimum signal change criteria, a “Range Fault” will be
declared and a “Fault Detected” message will be displayed alternately with the sensor’s current
reading. The 4-20mA output will be taken to 0mA.
NOTE 2: If the sensor fails the stability criteria, a “Stability Fault” will be declared and a
“Fault Detected” message will be displayed alternately with the sensor’s current reading. The
4-20mA output will be taken to 0mA.
NOTE 3: If the sensor fails the clearing time criteria, a “Clearing Fault” will be declared and a
“Fault Detected” message will be displayed alternately with the sensor’s current reading. The
4-20mA output will be taken to 0mA.
3.5 Program Mode
Program Mode provides a View Sensor Status menu to check operational and configuration parameters.
Program Mode also provides for adjustment of the AutoSpan Level, Bridge Voltage, Gas Factor, and Cal
Factor. Additionally, it includes the Restore Factory Defaults and Signal Output Check diagnostic functions.
The Program Mode menu items appear in the order presented below:
View Sensor Status
Set AutoSpan Level
Set Gas Factor
Set Cal Factor
Set Bridge Voltage
Signal Output Check
Restore Default Settings