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Example 1 Level Monitoring with Alarms
A vessel, containing a liquid that has a variation in level that is to be
monitored, with a high-level alarm set on Relay 1, and low level alarm set
on Relay 2.
empty distance (P105), 11.0 feet
100%, span (P106), 10.0 feet
85% , high alarm on (P213), 8.5 feet
80% , high alarm off (P214), 8.0 feet
15% , low alarm off (P224), 1.5 feet
10% , low alarm on (P223), 1.0 feet
In this example, when the level rises to 8.5 feet relay 1 will come on until
the level drops to 8.0 feet when it will turn off. If the level drops to 1.0 feet,
then relay 2 will come on until it rises 1.5 feet when it will turn off.
The display will show the level in the tank.
The mA output will be representative of level where 4mA = empty level
(0%) and 20mA = 10.0 feet (100%).
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