What is the function of a siphon tube when using pressure gauges on steam?

The function of a siphon tube when using pressure gauges on steam systems is to prevent hot steam from contacting the gauge. This is important because high temperatures can damage the gauge and affect its accuracy. A siphon tube is typically a device that creates a barrier between the hot steam and the gauge, usually filled with water, which absorbs the heat. This ensures that the pressure gauge operates within a safe temperature range, providing reliable readings.

When hot steam is present, its direct contact with the gauge could lead to rapid wear or failure, compromising the integrity of the gauge and leading to incorrect pressure readings. The siphon effectively acts as a thermal buffer, maintaining the functionality and longevity of the pressure measurement tool in steam applications.