The scale range of positive pressure analog indicators shall have the normal operating pressure fall within which part of the gauge scale?

The correct answer is that the normal operating pressure should fall within the middle third of the gauge scale. This positioning is crucial because it allows operators and technicians to easily read the gauge and inspect system functionality under typical operating conditions.

Having the normal operating pressure indicated in the middle third provides a clear visual representation that distinguishes between safe operating pressures versus potentially low or high pressures that could indicate a system malfunction. Moreover, this range allows for adequate pressure fluctuations without leading to confusion or misinterpretation of the gauge readings.

When the normal operating pressure is well within the middle third, it also ensures that any deviations from this range can be readily noted, enabling timely interventions. This approach is designed to enhance safety protocols and operational efficiency in any system utilizing positive pressure.