What is the dry pipe supervisory signal range?

The dry pipe supervisory signal range is critical in alarm and fire protection systems, particularly for dry pipe sprinkler systems. A supervisory signal is designed to ensure the integrity of the system by monitoring the air pressure within the pipes.

A range of +/- 10 PSI is typically established to indicate that the system is functioning correctly. When the pressure goes beyond this range, it can signal a potential issue, such as a leak or an obstruction, prompting inspection and maintenance. Having this specific supervisory range helps in ensuring the reliability of the system; if the pressure deviates from this designated range, it can alert personnel to take necessary corrective actions to maintain fire safety.

The other options are not in line with standard practices for monitoring supervisory signals in dry pipe systems, which is why they do not provide the correct parameters. In essence, the +/- 10 PSI range provides an effective balance between being sensitive enough to detect issues while minimizing false alarms.