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Reference Manual
00809-0100-3003
All mA outputs are grouped in descending order to signify importance and to allow for
instant status recognition; see
Normal operation between 4 to 20 mA (±0.2 mA): detector working, no fault conditions.
3.6
Fault outputs
3.6.1
2.0 mA sensor test fault
One or more sensor heads fail to respond with the correct value during the automatic self-
test.
Output is continuous at 2.0 mA unless the test is subsequently passed successfully or an
alarm condition occurs, in which case the normal sound level is transmitted on the current
loop. See
3.6.2
1.0 mA internal process fault
Continuous 1.0 mA (±0.2 mA) output for any known internal or external faults that include
over-voltage, high/low external voltage, blown fuse, or high/low internal voltage.
3.6.3
0.5 mA "All Sensors dead" fault
Continuous 0.5 mA (±0.2 mA) output, indicating that all four sensors have failed self-test.
Firmware version 3.4 onwards.
Recommended action
Contact your Emerson representative.
3.6.4
Zero mA major fault
Zero (0) mA output is either caused by a total loss of power to the detector or a serious
microprocessor fault.
Potential cause
Loss of power
Recommended action
The fault will be cleared when power is applied to the detector.
Potential cause
Serious microprocessor fault
Recommended action
Contact your Emerson representative.
Reference Manual
Fault
Alarm level
for more information regarding alarm settings.
outputs.
Operate
December 2020
37
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