Gauges that are not accurate within what percentage of the full scale must be recalibrated or replaced?

The requirement for gauges in fire protection systems to be accurate within a certain percentage of full scale is critical to ensure the systems operate effectively. According to NFPA 25, a gauge that is not accurate within 3% of the full scale needs to be recalibrated or replaced. This level of accuracy is essential because even small deviations can lead to significant consequences in the operation of fire protection systems.

Maintaining accuracy within this threshold is crucial for proper monitoring and functioning of the water-based fire protection systems. If gauges are off by more than 3%, they may provide misleading information that affects the decision-making process during emergencies, potentially compromising safety. Therefore, adhering to the 3% accuracy standard helps ensure reliable performance of the system and enhances the overall safety and effectiveness of fire protection measures.