MultiTrode MultiSmart Installation & Operation Manual page 119

MultiSmart Installation & Operation Manual
14.8.9.1 Primary Level High Range Setup
The High Range Primary and High Range Backup values (and the associated delay) are located at:
Definitions:
High Range Primary - the maximum level at which the primary must indicate in order to trigger a Primary
Level High Range fault. (The default value is 80%).
High Range Backup - the minimum level at which the backup must indicate in order to trigger a Primary
Level High Range fault. (The default value is 95%).
Figure 119 – Primary and Backup High Range Values
For example (with reference to the Figure above), the High Range Primary value = 80% and the High
Range Backup value = 95%. If the primary level device is reading less than 80% while the backup level
device is reading greater than 95%, a Well 1 Primary Level High Range fault is triggered (after the High
Range Delay has expired). The MultiSmart switches over to the backup level device as the source of level
information.
14.8.9.2 Primary Level Low Range Setup
Similarly the Low Range Primary and Low Range Backup values (and the associated delay) are set at the
same location as for the High Range values (see Section above). Following is an example of the Well 1
Primary Level Low Range fault.
Definitions:
Low Range Primary - the minimum level at which the primary must indicate in order to trigger a Primary
Level Low Range fault. (The default value is 15%).
Low Range Backup - the maximum level at which the backup must indicate in order to trigger a Primary
Level Low Range fault. (The default value is 5%).
Figure 120 – Primary and Backup Low Range Values
For example (with reference to the Figure above), the Low Range Primary value = 15% and the Low
Range Backup value = 5%. If the primary level device is reading greater than 15% while the backup level
device is reading less than 5%, a Well 1 Primary Level Low Range fault is triggered (after the Low Range
Delay has expired). The MultiSmart switches over to the backup level device as the source of level
information.
MultiSmart_IO_Manual_R20 Page 119 of 260