Which instrument is commonly used to measure pressures or forces on a column and is often found in boiler systems?

The diaphragm type pressure gauge is specifically designed to measure the pressure of fluids in a system by utilizing a flexible diaphragm that deforms in response to the pressure applied. This deformation is then translated into a readable measurement on the gauge. In boiler systems, where precise pressure readings are critical for safe operation, this type of gauge is especially valuable. It can accurately measure the pressure on a column of water or steam and provide direct indications of operating conditions.

The diaphragm gauge's design allows for high accuracy and sensitivity, making it suitable for a variety of applications, particularly in monitoring pressurized systems like boilers. Its construction can handle different ranges of pressure and apply mechanical movement to a pointer that indicates the pressure level on a calibrated scale.

In contrast, while other instruments like pressure transducers also measure pressure, they often convert this measurement into an electronic signal, which may not be as direct or easily interpretable as the traditional dial readout of a diaphragm gauge. The pneumatic control system is more focused on controlling processes rather than direct measurement, and strain gauges, while they can measure mechanical strain (which could relate to pressure indirectly), are not the primary instrument used for measuring fluid pressure in boiler systems. Thus, the diaphragm type pressure gauge stands out as the most relevant and commonly