Given a level of 5.75 ft and a wetwell of 20 feet, what is the calculated milliamp?

To determine the correct milliamp value based on the given level of 5.75 feet in a wet well with a total depth of 20 feet, one must use the linear relationship that often exists between the level measurement and the output current of a level sensor, typically expressed in milliamps.

In many level measurement applications, a common standard is that 4 mA represents a level of 0 feet (the lowest measurable point), and 20 mA corresponds to the maximum level (in this case, 20 feet). Each foot of level measurement will correspond to an increase in current output.

The first step is to convert the measurement level of 5.75 feet into a proportional value in milliamps using the formula:

[ \text{Output (mA)} = 4 , \text{mA} + \left(\frac{16 , \text{mA}}{20 , \text{ft}}\right) \times \text{Level (ft)} ]

Substituting the values:

[ \text{Output (mA)} = 4 + \left(\frac{16}{20}\right) \times 5.75 ]

Calculating the rise in current