In a remote boiler water level indicator, where is the constant head connection made?

In a remote boiler water level indicator, the constant head connection is made in the steam space. This is done to ensure that the water level in the indicator accurately reflects the water level in the boiler under varying conditions. The steam space connection allows for consistent pressure, which is crucial for the reliable operation of the level indicator since it provides a stable reference point for measuring the water level.

Connecting to the steam space helps in compensating for changes in boiler pressure or temperature, and as steam bubbles rise, they do not affect the water column measurement. This setup allows the gauge to operate correctly and give a true indication of the water level in the boiler, which is vital for safe operation.

In contrast, connecting to the atmosphere, water space, or condensate return line could lead to inaccurate readings due to pressure fluctuations or changes in temperature, ultimately compromising the safety and efficiency of the boiler system. Therefore, the steam space is the most suitable choice for establishing a constant head for the water level indicator.