Why are there a range of different belt sizes available for the Equivital system?

The correct sensor belt fit is imperative to ensuring that good quality data is recorded in all environments. The ECG, and respiratory sensors are integrated into the sensor belt. A correct belt fit ensures the correct level of contact and positioning of these sensors to provide highly accurate data. 

There are 4 different sizes of the current B6 belts (non-gender specific).
 

Size Lower Chest Circumference Range (cm) Lower Chest Circumference Range (in)
S 74-85 29-33.5
M 85-96 33.5-38
L 96-107.5 38-42
XL 107.5-120 42-47

A belt fitting guide is can be found here: https://adinstruments.my.salesforce.com/sfc/p/20000000HncM/a/69000001jaCI/rFLg7qLJzn.aeh_BPp.hbs.YYNVWClg8S_yruR9_XhA

The now-discontinued B3 belts came in 9 sizes, listed below.

Size

Lower Chest Circumference Range (cm)

Lower Chest Circumference Range (in)

1

74-79

29-31

2

79-84

31-33

3

84-89

33 -35

4

89 94

35-37

5

94-99

37-39

6

99-104

39-41

7

104 -109

41-43

8

109-114

43-45

9

114-119

45-47