Bently Nevada 3500/70M 176449-09 Recip Impulse Velocity Monitor
The documented four-channel front monitor spare for reciprocating-compressor vibration protection.
Product Identification
3500/70M 176449-09 is the front Recip Impulse Velocity Monitor used in the Bently Nevada reciprocating-compressor solution. It processes seismic-transducer signals for crankcase and crosshead vibration protection.
Channels are programmed in pairs, allowing the rack configuration to assign different acceleration or velocity functions to the two channel groups.
Engineering Data
| Manufacturer | Bently Nevada, a Baker Hughes business |
|---|---|
| Complete Identification | 3500/70M 176449-09 |
| Product Family | 3500 Machinery Protection System |
| Monitor Type | Recip Impulse Velocity Monitor |
| Channel Count | Four |
| Channel Functions | Impulse acceleration, acceleration 2, reciprocating velocity and low-frequency reciprocating velocity |
| Nominal Power Consumption | 7.7 W |
| Buffered Output Impedance | 550 Ω |
| Recorder Output | 4–20 mA per channel |
| Rack Requirement | One full-height front slot plus one matching rear slot |
| Configuration Tool | 3500 Rack Configuration Software |
Functions
- Crank-angle band processing supports impulse measurements tied to the compressor cycle.
- Acceleration and velocity modes provide separate views of reciprocating-machine vibration.
- Front buffered outputs support service measurements, while recorder values can feed plant systems.
- Alert and danger logic acts on the configured static values for machinery protection.
Applications
- Crankcase and crosshead vibration protection on reciprocating compressors.
- Impulse-acceleration monitoring aligned with machine crank angle.
- Low-frequency velocity duties using approved seismic transducers and rear I/O.
Lifecycle
- Archive channel-pair functions, filter selections, crank-angle bands, transducer sensitivities and alarm settings.
- Keep the rear I/O and sensor combination linked to the front monitor in the spare record.
- Repeat the site-approved signal and trip validation after any monitor exchange.
FAQ
Is 176449-09 the correct front spare for 3500/70M?
Yes. The current spare-parts table identifies 176449-09 as the 3500/70M Recip Impulse Velocity Monitor.
Which rear I/O can be used with 3500/70M 176449-09?
Select the documented internal, external or barrier option from the Proximitor, accelerometer and Velomitor mix.
Can 3500/70M 176449-09 use four unrelated channel functions?
Functions are assigned by channel pairs, so the planned measurement set must respect that pairing structure.
What compressor information helps configure 3500/70M 176449-09?
Provide running-speed range, crank reference, sensor types and sensitivities, measurement objectives and alarm philosophy.
Can a 3500/72M configuration be loaded into 3500/70M 176449-09?
No. The two monitors process different machine variables and require their own supported configuration and I/O design.
What acceptance testing follows a 3500/70M 176449-09 exchange?
Verify sensor health, crank-angle reference, channel-pair processing, alarms, relay paths, recorder outputs and rack communication.
