Bently Nevada Seismoprobe® Velocity Transducer Systems are designed to measure absolute (relative to free space) bearing housing, casing, or structural vibration. The two-wire systems consist of a transducer, appropriate cable, and an optional velocity-to-displacement converter.

The Seismoprobe® family of velocity transducers are a two-wire design that uses moving-coil technology and provides a voltage output directly proportional to the transducer's vibration velocity. Unlike solid-state velocity transducers (which are inherently accelerometers with embedded integration electronics), moving-coil transducers are less sensitive to impact or impulsive excitation, and can represent a good choice for certain applications. Also, because they require no external power, they are convenient for portable measurement applications.

Two types of Seismoprobe® Velocity Transducers are available:
􀂃 9200: The 9200 is a two-wire transducer suitable for continuous monitoring or for periodic measurements in conjunction with test or diagnostic instruments. When ordered with the integral cable option, the 9200 has excellent resistance to corrosive environments without need of additional protection.
􀂃 74712: The 74712 is a high temperature version of the 9200.
Various interconnect cables are available for connecting the 9200 and 74712 transducers to other instruments or a velocity-to-displacement converter. These cables are available in one-foot (300 mm) increments, with or without stainless steel armor.
One type of velocity-to displacement converter (VDC) is available:
􀂃 9513: to be used with 9200 and 74712 transducers.

Ordering Information
Two-wire Transducer
The 9200 Two-wire Velocity Seismoprobe® Transducer can be used with the 9513 VDC which is ordered separately (see Velocity-to-Displacement Converter).
9200-AXX-BXX-CXX-DXX
Option Descriptions
A: Transducer Mounting Angle/Minimum
0 1 0 ±2.5, 4.5 Hz (270 cpm)
0 2 45 ±2.5, 4.5 Hz (270 cpm)
0 3 90 ±2.5, 4.5 Hz (270 cpm)
Operating Frequency Option
0 6 0 ±100, 10 Hz (600 cpm)
0 9 0 ±180, 15 Hz (900 cpm)
1 1 90 ±10, 10 Hz (600 cpm)
B: Connector Option
0 1 Top Mount
0 2 Side Mount
0 5 Terminal block top mount
0 6 Coaxial connector (for test equipment only)
0 7 thru 5 0
Environmentally resistant with integral cable. Option number corresponds to cable length 7.0 feet (2.1 metres) min., 50.0 feet (15 metres) max., ordered in increments of 1.0 foot.
C: Mounting Base Option
0 1 Circular; 1/4-in 20 UNC stud
0 2 Circular; 1/4-in 28 UNF stud
0 3 Rectangular flange
0 4 Circular; with three 8-32 threaded studs on a 44 mm (1.75 in) diameter bolt circle
0 5 No base; 1/2-in 20 UNF-3A stud
0 6 Isolated circular 1/4-in 20 UNC stud
0 7 Isolated circular 1/4-in 28 UNF stud
0 8 Isolated rectangular flange
0 9 Isolated circular 5/8-in 18 UNF stud
1 0 Circular; M10X1 stud
1 1 Isolated circular M10X1
1 2 Isolated circular ½-in 20 UNF-2A
D: Agency Approval Option
0 0 No approvals required
0 1 CSA/NRTL/C
0 2 EUROPEAN
0 4 Multiple Approvals

High-temperature two-wire transducer
The 74712 High Temperature Two-Wire Seismoprobe® Velocity Transducer can be used with the 9513 VDC, which is ordered separately (see Velocity-to-Displacement Converter).
74712-AXX-BXX-CXX DXX
Option Descriptions
A: Transducer Mounting Angle/Minimum Operating Frequency Option
0 1 0 ±2.5, 4.5 Hz (270 cpm)
0 2 45 ±2.5, 4.5 Hz (270 cpm)
0 3 90 ±2.5, 4.5 Hz (270 cpm)
0 4 135 ±2.5, 4.5 Hz (270 cpm)
0 5 180 ±2.5, 4.5 Hz (270 cpm)
0 6 0 ±100, 10 Hz (600 cpm)
0 7 0 ±180, 15 Hz (900 cpm)
B: Mounting Base Option
0 1 Circular; 1/4-in 20 UNC stud
0 2 Circular; 1/4-in 28 UNF stud
0 3 Rectangular flange
0 4 Circular base with three 8-32 studs
0 5 No base; 1/2-in 20 UNF-3A stud
0 6 Isolated circular ¼-in 20 UNC-2B
0 7 Isolated circular ¼-in 28 UNF-2B
0 8 Isolated rectangular flange
0 9 Isolated circular 5/8-in 18 UNF-2A
1 0 Circular M10X1
1 1 Isolated circular base M10X1
1 2 Isolated circular base ½-in 20
C: Connector Option
0 1 Coaxial connector for test equipment only: rated to +165°C (+329°F).
0 2 Top mount
0 3 Terminal block top mount
0 4 Side mount
D: Agency Approval Option
0 0 No approvals required
0 1 CSA/NRTL/C
0 2 EUROPEAN
0 4 Multiple Approvals

Standard Cables
9571
2-conductor twisted, shielded 22 AWG (0.5 mm2) cable with 2-socket moisture-resistant female connector at one end, terminal lugs at the other end. (Used with monitors or VDCs). Minimum length of 2.0 ft (0.6 m), maximum length of 99 ft (30 m).
84661
2-conductor twisted, shielded 22 AWG (0.5 mm2) armored cable with 2-socket moisture-resistant female connector at one end, terminal lugs at the other end. (Used with monitors or VDCs). Minimum length of 3.0 ft (0.9 m), maximum length of 96 ft (29 m).