Description
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 and appropriate cable.
The Seismoprobe family of velocity transducers is a two-wire design that uses moving-coil technology. It provides a voltage output directly proportional to the transducer's vibration velocity.
Moving-coil transducers are less sensitive to impact or impulsive excitation than 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. Because they don’t require external power, they are convenient for portable measurement applications.
For most installations, Bently Nevada's Velomitor family of velocity transducers, which incorporate solid-state technology, provide improved performance and ruggedness for casing velocity measurement applications.
Available Types
Two types of Seismoprobe Velocity Transducer 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.
Interconnect cables are available for connecting the 9200 and 74712 transducers to other instruments. These cables are available in various lengths with or without stainless steel armor.
When ordering the 9200 and 74712 Seismoprobe Velocity Transducers, expect approximately a six (6) week lead time. That lead time can vary based on component availability and configuration. Contact your local Bently Nevada representative for projected lead times for your specific order.
Measuring Housings for Transducer Placement
If you are measuring a machine housing to determine where to place transducers, consider the types of measurements you want to obtain. Most common machine malfunctions like imbalance or misalignment originate at the rotor and cause a change—usually an increase—in rotor vibration.
If you integrate the 330500 Velomitor output to measure displacement, electrical noise from interference and the transducer circuit can be amplified. The noise can degrade performance of 330500 transducers and produce inaccurate displacement data.
To obtain high quality data, plan on locating the transducer in a location where it can best detect machine vibration through the bearing housing or machine casing. Select a location, grounding, and shielding that maximizes amplitude and frequency response and lessens data that doesn’t represent actual machine vibration. Bently Nevada provides engineering services to determine the optimum location to place transducers. We also can install transducers if needed. For assistance, contact your local customer care representative or Bently.com.
Ordering Information
For the detailed listing of country and product specific approvals, refer to the Approvals Quick Reference Guide (document 108M1756) at Bently.com.
An isolated base (‘06’ thru ‘09’, or ‘11’, ‘12’ in Mounting Base Option) is required when ‘04’ Agency Approval Option is selected.
High-temperature Two-wire Transducer
74712 - AA-BB-CC-DD
A: Transducer Mounting Angle/Minimum Operating Frequency Option
01
0 ±2.5, 4.5 Hz (270 cpm)
02
45 ±2.5, 4.5 Hz (270 cpm)
03
90 ±2.5, 4.5 Hz (270 cpm)
06
0 ±100, 10 Hz (600 cpm)
07
0 ±180, 15 Hz (900 cpm
B: Mounting Base Option
01
Circular; 1/4-in 20 UNC stud
02
Circular; 1/4-in 28 UNF stud
03
Rectangular flange
04
Circular; with three 8-32 threaded
studs on a 44 mm (1.75 in) diameter
bolt circle
05
No base; 1/2-in 20 UNF-3A stud
06
Isolated circular 1/4-in 20 UNC stud
07
Isolated circular 1/4-in 28 UNF stud
08
Isolated rectangular flange
09
Isolated circular 5/8-in 18 UNF stud
10
Circular; M10X1 stud
11
Isolated circular M10X1
12
Isolated circular ½-in 20 UNF-2A
C: Connector Option
02
Top Mount
03
Terminal block top mount
04
Side mount
D: Agency Approval Option
00
No Approvals
01
CSA
04
ATEX/IECEx
