Peristaltic pumps are marked in two ways. One type uses “a*b” to indicate the inner diameter of the pump tubing, where “a” represents the inner diameter and “b” represents the wall thickness. For example, a 3*1 tubing indicates an inner diameter of 3mm, a wall thickness of 1mm, and an outer diameter of 5mm. Tubings conforming to this method include 1*1, 2*1, 3*1, and 4*1.
The second type uses numbers with a “#” designation. For example, a 13# tubing has an inner diameter of 0.8mm, a wall thickness of 1.6mm, and an outer diameter of 4mm. Similar tubing models include 14#, 16#, 25#, 17#, 18#, 15#, 24#, 35#, 36#, 72#, and 80#.
The tubing wall thickness comes in five different sizes: 1mm, 1.6mm, 2.4mm, 3.3mm, and 4.8mm.
When distinguishing peristaltic pump tubes of different sizes, it is not always possible to obtain an accurate inner diameter or wall thickness by directly measuring with calipers. It is generally recommended to apply a layer of paint to the circle on the side wall (wall thickness) of the peristaltic pump tube, then stamp it onto white paper to obtain a graphic. Measuring the inner diameter and wall thickness of this graphic with a ruler will give a relatively accurate dimension.