Which of the following NPS is allowed for connecting tubing for alarms?

The connection of tubing for alarms typically requires fittings that meet specific size standards to ensure proper functionality and performance. The 1/4-inch nominal pipe size (NPS) is commonly used in alarm systems due to its suitability for low-pressure applications and its ability to handle the necessary flow and pressure without being overly large or cumbersome.

Using 1/4-inch NPS for alarm connections helps ensure that the appropriate amount of gas or signal can be effectively transmitted through the tubing. This size allows for good sensitivity and responsiveness in alarm systems, which is crucial in medical and safety applications. Proper sizing is essential for maintaining the integrity of response signals from medical gas monitoring systems, making 1/4-inch NPS the suitable choice in this context.

Larger or smaller sizes may not provide the same level of efficiency or could even lead to potential issues with flow rates and pressure detection, making them less ideal for use in alarm connections.