Siemens HydroRanger 200 HMI, Руководство по эксплуатации

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Operating
7.2 Dual-point models
HydroRanger 200 HMI
94
Operating Instructions, 06/2018, A5E36281317-AC
7.2.2 Measurement conditions
The following information will help you configure your device for optimal performance and
reliability.
Response rate
The response rate of the device influences the measurement reliability. Use the slowest rate
possible with the application requirements.
The response rate is also important to functions connected to the filling or emptying
indicators.
Dimensions
The dimensions of the vessel, wet well, or reservoir (except empty and span) are only
important if you require volume. Volume is required to report the level value in terms of
Volume. The pumped volume function can also report pumped volume or pump efficiencies.
Fail-safe indexes
The fail-safe parameters ensure that other devices controlled by the device default to an
appropriate state when a valid level reading is not available.
● LOE timer (2.4.2.) (Page 177)
–
Fail-safe timer activates if an error condition is detected. Upon expiration of the timer,
relay status defaults to values based on Material Level.
● Material level (2.4.5.) (Page 178)
–
Fail-safe material level determines the level reading if the fail-safe timer expires and
the unit is still in an error condition.
● Relay fail-safe (2.8.2.3.) (Page 201)
–
Relay fail-safe controls the reaction of each relay. For more information, see Relay
fail-safe (Page 104).
If Fail-safe Operation activates frequently, see Diagnosing and troubleshooting (Page 281).