SLIA097 March 2022 DRV5011 , DRV5011 , DRV5012 , DRV5012 , DRV5013 , DRV5013 , DRV5015 , DRV5015 , DRV5021 , DRV5021 , DRV5023 , DRV5023 , DRV5032 , DRV5032 , DRV5033 , DRV5033 , TMAG5110 , TMAG5110 , TMAG5111 , TMAG5111 , TMAG5123 , TMAG5123 , TMAG5231 , TMAG5231 , TMAG5328 , TMAG5328
Many magnet options exist for implementation in flow meters. The options can be divided into two distinct categories: multipole and bipolar magnets. Flow meters can rely on a single multipole magnet or the use of multiple bipolar magnets positioned to achieve the desired resolution for the sensor. Magnets can vary in shape and size to meet the Hall sensor requirements. Common bipolar magnet shapes are illustrated in Figure 2-1.
Radially magnetized ring magnets are the most common form of multipole magnet used in flow meters. This type of magnet can be created to have the pole count of many individual magnets, while being retained in a single piece of magnetic material (see Figure 2-2).
Multipole ring magnets enable high resolution in space-constrained designs; however, they typically cost more than other magnet alternatives.