Non-Critical Faults; Critical Faults - Emerson MRLDS-250 Installation And Operation Manual

4.5.2. Non-Critical Faults

Non-critical faults typically recover by allowing
the gas detector surroundings to stabilize, for
example, after a defrost cycle. The gas detector
continues to monitor its surroundings during
non-critical faults, but may report inaccurate
readings.
The following occurs when a non-critical fault
condition exists.
Behavior During Non-Critical
Item
Green LED
On (solid)
Display
Shows the appropriate fault code
Analog Output
Operates Normally
Table 4-2 MRLDS-250 Behavior During a Non-Critical Fault

4.5.3. Critical Faults

Critical faults may indicate an unrecoverable
condition. Please refer to Section 7, Troubleshooting
for more information. The following occurs when a
critical fault condition exists:
Item Behavior During Critical Faults
Green LED Off (solid)
Display Shows the appropriate fault code
4-20 mA output
Analog Output 1- 5V output
2-10V output
Table 4-3 MRLDS-250 Behavior During a Critical Fault
Gas Detector Faults
Faults
Changes to 2 mA
Changes to 0.5V
Changes to 1.0V
Operation and Stabilization • 11