The following sections outline some of the different types of manometers in further detail:
U-tube manometers are one of the simplest varieties available. They are a type of analogue manometer commonly used as differential pressure measurement instruments with flow meters, often used when measuring pressure difference in pitot tubes, nozzles and orifices in airflow and ventilation systems.
U-tube manometers consist of relatively few parts and are usually one of the cheaper types of manometer, but the trade-off for this is that accuracy can be poor. As a result, a u-tube manometer should not be used to measure particularly small pressure differences and an alternative manometer should be used instead. Lastly, the viewing angle is key when working with u-tube manometers to ensure the reading is as accurate as possible.
Micromanometers are similar to other manometer types, but they are specifically designed to measure very small pressure differences. These instruments are highly sensitive and are well suited to taking accurate, precise readings of the smallest differences. Although they are primarily used for measuring differential pressure, micromanometers can also be used to test or balance systems and calculate velocity or volumetric flow rate.
Inclined manometers are typically used to measure liquids and gases where the pressure is very low. The angled design of the inclined manometer makes it particularly well-suited to this role, enabling accurate measurements to be taken. Despite this, digital manometers are often preferred nowadays due to their high levels of accuracy and ease of use.
Digital manometers have largely become the norm and are now widely used by professionals for a variety of measurement applications. As opposed to analogue manometers, digital models contain a pressure transducer which deflects under pressure. The device then converts the deflection into the value of an electrical parameter which can be detected and calibrated to a pressure reading, in turn, thus providing the measurement.
Precise and easy to read, digital manometers can be used for multiple mediums and can also be calibrated to ensure a greater degree of accuracy. Gauge and absolute digital manometers will have a single connection port – gauge reading is relative to atmospheric pressure and absolute reading is relative to a vacuum. It’s also worth noting that some models allow for communication between the manometer and a PC to enable quick and easy download of either stored or live measurements and recordings.
Digital manometers are advantageous for a number of reasons, including:
- Easy to read and use
- Avoid reliance on manometric fluids
- High degree of accuracy and precision