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Setting Up Point 2 with as an Ultrasonic Point of Measurement
If it is required that point two is to be set up as an ultrasonic transducer to measure
level in air follow the procedure as per the example below.
Example 2: Level Monitoring with High and Low Alarms on Point 2
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. The
following method uses an air transducer from the dB range, example shown is a
dB6 on channel 2.
empty distance (P1105), 3.5m
85% , high alarm on (P223), 2.38m
80% , high alarm off (P224), 2.24m
15% , low alarm off (P234), 0.42m
10% , low alarm on (P233), 0.28m
In this example, when the level rises to 2.38 m, relay 2 will come on until the level
drops to 2.24 m when it will turn off. If the level drops to 0.28 m, then relay 3 will
come on until it rises 0.42 m when it will turn off.
The display for point 2 will show the level in the tank.
The mA output will be representative of level where 4mA = empty level (0%) and
20mA = 2.8m (100%).
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