Pneumatic transmitters operate at pressures between 3 and _____ psig.

Pneumatic transmitters are instruments commonly used in various industrial applications to measure pressure, temperature, or other process variables, and they typically operate using air pressure as their signal medium. The standard operational pressure range for most pneumatic transmitters starts at a low point of about 3 psig and extends up to a maximum of approximately 15 psig. This range is crucial because it allows for effective signal transmission and processing while maintaining a balance between sensitivity and robustness.

The choice of 15 psig aligns with the most common design specifications for pneumatic systems, which are engineered to operate efficiently within this pressure range. Operating beyond this limit can lead to performance issues or potential damage to the transmitter. The other options represent pressures significantly higher than what standard pneumatic transmitters are designed to handle effectively or what is typically used in practice, making them less suitable in this context.