Description
Velomitor® Piezo-velocity Sensors measure absolute (relative to free space)
bearing housing, casing, or structural vibration. Unlike moving-coil velocity
transducers, such as the Bently Nevada™ Seismoprobe® family of velocity
transducers, Velomitor Piezo-velocity Sensors incorporate a solid-state design,
and are specialized piezoelectric accelerometers with embedded integration
electronics. Because they incorporate solid-state electronics with no moving
parts, they do not suffer from mechanical degradation and wear, and can be

mounted vertically, horizontally, or at any other angle of orientation.

Ordering Information
Velomitor Piezo-velocity Sensor
330500-AXX-BXX
A: Mounting Thread Adapter Option
0 0 No adapter
0 1 1/2 - 20 UNF
0 2 M8 x 1
0 3 1/4 - 28 UNF
0 4 1/4 - 20 UNC
0 5 Unavailable for 330500.
For 1/4-18 NPT mounting,
order 330525.
0 6 5/8 – 18 UNF
0 7 3/8 – 16 UNC
0 8 1/2 – 13 UNC
B: Agency Approval Option
0 0 Not required
0 1 CSA/NRTL/C
0 2 SIRA/CENELEC
0 4 Multiple approvals

2-Conductor Twisted-Pair 22 AWG Cable with Female
Plug and Terminal Lugs
9571-AXX
A: Cable length Option in feet
Order in increments of 1.0 ft (305 mm).
Minimum: 2.0 ft (0.6 m)
Maximum: 99 ft (30 m)
Example: 0 9 = 9 ft
1 2 = 12 ft
2-Conductor Twisted-Pair 22 AWG Armored Cable with
Female Plug and Terminal Lugs
84661-AXX
A: Cable length Option in feet
Order in increments of 1.0 ft (305 mm).
Minimum: 3.0 ft (0.9 m)
Maximum: 96 ft (29 m)
Example: 0 9 = 9 ft
1 2 = 12 ft

2-Conductor Twisted-Pair 18 AWG Cable with Right Angle
Plug and Terminal Lugs
89477-AXX
A: Cable length Option in feet
Order in increments of 1.0 ft (305 mm).
Minimum: 2.0 ft (0.6 m)
Maximum: 99 ft (30 m)
Example: 0 9 = 9 ft
1 2 = 12 ft
2-Conductor Twisted-Pair 18 AWG Cable with
Fluorosilicone-Booted Plug and Terminal Lugs
125065-AXX
A: Cable length Option in feet
Order in increments of 1.0 ft (305 mm).
Minimum: 2.0 ft (0.6 m)
Maximum: 99 ft (30 m)
Example: 0 9 = 9 ft

Velocity Transducer Housing Assembly
21128-AXX-BXX
A: Mounting Thread Option
0 1 Unthreaded
0 2 3/4 - 14 NPT
0 3 1/2 - 14 NPT
0 4 1/2 - 12 BSP
B: Cable Exit Fitting Option
0 1 1/2 - 14 NPT plug
0 2 1/2 -14 NPT explosion-proof
0 3 1/2 -14 NPT explosion-proof
with cable gland seal
Note: Applications that use the 21128 housing require cable
part number 89477-AXX to connect the Velomitor sensor
to a monitor.

Velocity Transducer Housing – CENELEC approved
107770-AXX-BXX
This part is a 21128 Housing with a 330500
Velomitor Sensor pre-installed at the factory. This
part is rated for CENELEC Zone 1, Group IIC
hazardous area applications.
A: Mounting Thread Option
0 1 Unthreaded
0 2 3/4 - 14 NPT
0 3 1/2 - 14 NPT
0 4 1/2 - 14 BSP
B: Cable Exit Fitting Option
0 1 1/2 - 14 NPT plug
0 2 1/2 - 14 NPT explosion-proof
0 3 1/2 - 14 NPT explosion-proof
with cable gland seal