Raritan DRX Series - DX-Vbr

Chapter 3: DX Series
32
DX-VBR
DX-VBR contains one vibration sensor and a pair of terminals for
connecting a contact closure (CC) sensor.
Vibration sensor:
The built-in vibration sensor detects the vibration of any object where
DX-VBR is affixed. The sensor determines the vibration by measuring the
accelerations in three mutually perpendicular directions, and then
generating a numeric value representing the magnitude of the
acceleration due to gravity of the Earth. Below is the calculation formula.
a = (a
x
2
+ ay
2
+ az
2
)
1/2
 The acceleration has two measurement units: g and milli-g.
 1 g = 9.80665 m/s
2
 1 milli-g = 0.001 g
 "a" in the above formula denotes the magnitude of the acceleration.
 0 <= a <= 3.464 g
Note: <= means "less than" or "equal to."
 ax, ay and az represent the accelerations in three mutually
perpendicular directions x, y and z.
 x, y and z form a Cartesian coordinate system.
 -2 g <= a
x <= 2 g
 -2 g <= a
y <= 2 g
 -2 g <= a
z <= 2 g