Welker OdorEyes ECOsystem Pulse Bypass System Installation, Operation And Maintenance Manual page 37

Figure 33: Gas Flow Signal – Fail Mode Setup
Setting the Fail Mode to Shutdown will halt odorization until the alarm is cleared.
Setting the Fail Mode to Constant Rate will allow odorization to continue at the specified rate.
If the gas flow value does not change during the Pulse Input Cutoff time, the system will alarm for loss of flow and will enter the
specified Fail Mode. The alarm will clear on the next pulse input or change in Modbus gas flow, and the system will resume normal
operation.
37 IOM-181 | MODEL: ECOSYSTEM™ WITH XLT CONTROLLER | REV: C 13839 West Bellfort Street, Sugar Land, TX 77498 welker.com Service Department: 281.491.2331