Detcon FP-524D-HRT - Manual (Page 29)

Model FP-524D-HRT
FP-524D-HRT Instruction Manual Rev. 0.1 Page 25 of 48
Memory Fault
If the detector has a failure in saving new data to memory, a “Memory Fault” is declared. A “Memory Fault”
will cause the “Fault Detected” message to scroll once a minute on the sensor display. If a Memory Fault
occurs, the 4-20mA signal will be set at 0mA until the fault condition is resolved.
4-20mA Loop Fault
If the detector measures a 4-20mA loop load resistance > 1000 ohms, a “4-20mA Fault” is declared. A “4-
20mA Fault” will cause the “Fault Detected” message to scroll once a minute on the sensor display. If a Loop
Fault occurs, the 4-20mA signal will be set at 0mA until the fault condition is resolved.
Input Voltage Fault
If the detector is currently receiving an input voltage that is outside of the 11.5-28VDC range, an “Input
Voltage Fault” is declared. An “Input Voltage Fault” will cause the “Fault Detected” message to scroll once a
minute on the sensor display. If an Input Voltage Fault occurs, the 4-20mA signal will be set at 0mA until the
fault condition is resolved.
Temperature Fault
If the detector is reporting currently an ambient temperature that is outside of the –40ºC to +75ºC range, a
“Temperature Fault” is declared. A “Temperature Fault” will cause the “Fault Detected” message to scroll
once a minute on the sensor display. If a Temperature Fault occurs, the 4-20mA signal remains operational.
AutoSpan Fault
If 180 days has elapsed since the last successful AutoSpan, an AutoSpan Fault will be generated. An
“AutoSpan Fault” will cause the “Fault Detected” message to scroll once a minute on the sensor display. If an
AutoSpan Reminder Fault occurs, the 4-20mA signal remains operational.