The pneumatic output of a 3-15 psi instrument is at 50%. What is the actual output in pressure?

To determine the actual output in pressure of a pneumatic instrument with a range of 3-15 psi when the output is at 50%, it is essential to first understand the total range of the instrument. The range spans from 3 psi to 15 psi, which means the total span is calculated by subtracting the lower limit from the upper limit:

15 psi - 3 psi = 12 psi.

Now, since the output is at 50%, we want to calculate 50% of the total span, which is:

50% of 12 psi = 0.5 × 12 psi = 6 psi.

This value represents the increase above the lower limit of the output range. To find the actual pressure output, we need to add this increase to the starting point of the range:

3 psi (the lower limit) + 6 psi (the calculated increase) = 9 psi.

Therefore, when the pneumatic output is at 50%, the actual output in pressure is 9 psi.