Bently Nevada 3500/62 Process Variable Monitor
A six-channel monitor for continuous protection using proportional current or voltage process signals.
Product Identification
3500/62 brings machine-critical process variables into the 3500 protection rack. It conditions field current or voltage signals and compares each active measurement with configured under or over alarm limits.
The selected rear I/O determines whether the installation uses voltage input, isolated current input or current input with internal intrinsic-safety barriers.
Engineering Data
| Manufacturer | Bently Nevada, a Baker Hughes business |
|---|---|
| Model | 3500/62 |
| Product Family | 3500 Machinery Protection System |
| Monitor Type | Process Variable Monitor |
| Channel Count | Six |
| Voltage Input Option | −10 to +10 V DC |
| Current Input Options | Isolated 4–20 mA or internal-barrier 4–20 mA |
| Typical Power Consumption | 7.0 W |
| Isolated-I/O Rating | 500 V |
| Configuration Range | Up to 20,000 engineering units |
| Main Monitor Spare | 163179-03 |
| Rack Requirement | One full-height front slot plus one matching rear slot |
Functions
- User-defined engineering units allow process signals to be scaled for the monitored variable.
- Independent under and over alarm behavior supports protection for pressure, flow, level or temperature duties.
- Selectable I/O architectures separate general-purpose, isolated and intrinsically safe installations.
- TMR voting is supported by three adjacent monitors, although TMR units are no longer offered for purchase.
Applications
- Continuous monitoring of process pressure, flow, level and temperature that affect machine protection.
- Integration of external transmitters into rack alarm and relay logic.
- Replacement support for existing TMR arrangements where the installed hardware remains in service.
Lifecycle
- Preserve the selected input type, engineering-unit scale, alarm sense and delay for every channel.
- Document the rear I/O part, external termination block, barrier power and cable assembly.
- Treat any TMR change as a protection-system modification requiring engineering review and proof testing.
FAQ
Which rear I/O should be ordered with 3500/62?
Choose the voltage, isolated-current or barrier-current option from the transmitter signal, isolation need, hazardous-area design and termination method.
Can 3500/62 accept a loop-powered transmitter through every I/O option?
No. The electrical interface and available transducer power depend on the selected rear I/O; verify the complete loop design.
What must be supplied for a 3500/62 replacement enquiry?
Provide front and rear part numbers, signal type, transmitter power, scaling, alarm logic, approval basis and rack configuration.
Is a new TMR 3500/62 arrangement available for purchase?
The current documentation states that TMR units are no longer available, so lifecycle planning should address the installed architecture explicitly.
Can the 3500/62 engineering scale be changed without a protection review?
A scale change alters alarm interpretation and controller data, so it requires controlled verification of the complete protection loop.
What should be tested after exchanging 3500/62?
Inject representative loop values and verify scaling, under and over alarms, delays, relay action, bypass and any TMR voting response.
