220.127.116.11.2 Dry-Type Sprinkler.
(1) A pressure supervisory signal-initiating device for a dry-
pipe sprinkler system shall indicate both high- and low-
(2) The off-normal signal shall be initiated when the pressure
increases or decreases by 10 psi (70 kPa)
Dry sprinkler systems are used to protect areas of a premises where a wet sprinkler system would freeze due to the environment conditions. Below we have a dry system for a car parking garage area of a residential building. NFPA 72 specifies that the building fire alarm system must monitor high and low air pressure conditions of the dry system.
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