The Meter Input Properties tab fields vary depending on the Meter Input Type that you selected. This sections describes the fields related to either the Mass (Pulse) or Volume (Pulse) Meter Input Type.
You can configure these properties directly in ClearSCADA, or read the configuration into the ClearSCADA database (see Configure or Read the Flow Run Configuration).
- Input Type—When you select a Mass (Pulse) or Volume (Pulse) Meter Input Type you can select from one of the following input types:
- Telepace Long
- ISaGRAF integer
The availability of the fields in this section varies, depending on the Input Type.
-
Input Register—Define the address of the register that contains the input value. Valid register values are in the following ranges 30001 to 39998 and 40001 to 49998.
- Low Flow Pulse Limit—Set the number of pulses below which a low flow alarm will occur. When the number of pulses falls below the Low Flow Pulse Limit, pulses are not accumulated against volume or rate until the number of pulses rises above the low flow pulse limit again. Setting the low flow pulse limit to 0, disables low flow detect. The default value is 10.
- Low Flow Detect Time—Set the length of time the number of pulses needs to remain below the Low Flow Pulse Limit for a low flow alarm to occur. Valid values are from 1 to 60 seconds. The default value is 5.
The input alarms fields allow you to set the alarm thresholds for alarm types that have been enabled in the Input Properties section.
Use the following to configure alarm limits:
- High-High Alarm Threshold—Set the high-high alarm threshold value for the pulse rate. A valid entry value is any value within the pulse rate range that is higher than or equal to the value of High Alarm Threshold. This control is enabled if the High-High Alarm option is enabled on the Input Properties section.
- High Alarm Threshold—Set a high alarm threshold for the pulse rate. A valid entry value is any value within the pulse rate range that is higher than the value of Low Alarm Threshold, and is lower than or equal to the value of High-High Alarm Threshold. This control is enabled if the High Alarm option is enabled on the Input Properties section.
- Low Alarm Threshold—This allows you to set a low alarm threshold for the rate. A valid entry is any value in the pulse rate range that is lower than the value of High Alarm Threshold. This control is enabled if the Low Alarm option is enabled on the Input Properties section.
- Alarm Hysteresis—Set the hysteresis value for each configured alarm type. The hysteresis setting determines at what level alarms are cleared when the input variable reading returns to a non-alarm state. This setting reduces nuisance alarms around the alarm threshold. Enter a value in the full-scale range of the input variable.
Further Information
For more detailed information on these properties, see the documentation provided with the RealFLO application.