Bently Nevada 1900/65A (Assembly 172323-01) – General‑Purpose Equipment Monitor for Vibration, Position, and Speed

The Bently Nevada 1900/65A is a compact, standalone condition monitoring and protection monitor designed for small and mid‑size rotating assets—pumps, fans, motors, compressors—where a full 3500 rack would be excessive. Assembly 172323-01 typically refers to a specific factory build of the 1900/65A, combining standard vibration/Keyphasor support with industrial power and field I/O. From my experience, it’s a go‑to when you need reliable trips, clean 4–20 mA outputs for the DCS, and straightforward Modbus integration without a large footprint.

Our Order Placement Process and Guarantees

• – Warranty: 365 days from delivery

• – Delivery: 1 week if in stock; no more than 1 month at the latest

• – Payment: 50% advance; full payment prior to delivery

– Express options: FedEx, UPS, DHL

Key Features

• Multi‑purpose monitoring – Accepts proximity probes (shaft vibration/position), velocity sensors, and accelerometers for broad machine coverage.
• Speed/Keyphasor support – Tachometer/Keyphasor input enables speed tracking, phase, and alarm logic tied to running speed.
• Integrated protection relays – Programmable relay outputs for Alert/ Danger trip, typically used to interlock drives and protect equipment.
• 4–20 mA outputs – Scalable analog signals for DCS/PLC trending without extra signal conditioners.
• Buffered dynamic outputs – Technicians can connect analyzers for waveform/FFT without disturbing the process signal.
• Modbus connectivity – RS‑485 (Modbus RTU) and, in many cases, an Ethernet option for Modbus TCP, simplifying SCADA integration.
• Compact footprint – Fits inside crowded MCCs or local junction panels; wiring is straightforward and well‑labeled.
• Robust alarm strategy – Dual‑level alarms, latching/non‑latching behavior, startup inhibit and timed OK logic to avoid nuisance trips.

Technical Specifications

Application Fields

Typically used on API and non‑API pumps, cooling‑tower fans, blowers, small compressors, extruder drives, and general‑purpose motors/gearboxes. You might notice that it’s particularly handy in brownfield plants where adding a few channels of protection plus Modbus data can extend asset life without a major controls project.

• Water and wastewater: pump skids, lift stations, aeration blowers
• Oil & gas / petrochem: process pumps, small compressors, auxiliary machines
• Power generation: ID/FD fans, condensate and boiler feed support equipment
• Pulp & paper / mining: conveyors, refiners, mill drives where protection trips are required

Advantages & Value

• Cost‑effective protection – In many cases, far less costly than a full rack system while covering the critical channels you actually need.
• Broad sensor compatibility – Works with mainstream proximity probes and velocity/accelerometer sensors, reducing spare parts complexity.
• Simplified integration – 4–20 mA plus Modbus means your DCS/PLC sees clean values without custom drivers.
• Reliable interlocks – Proven trip logic and relays help prevent secondary damage during high vibration events.
• Serviceability – Buffered outputs and clear diagnostics make field checks quick; maintenance teams typically appreciate that.

Installation & Maintenance

• Panel/Cabinet – Install in a clean, dry panel (IP54 or better). Allow ventilation space; avoid mounting near high‑heat sources.
• Power & Grounding – Provide a regulated 24 VDC supply; bond shields at one end; maintain a solid instrument ground to minimize noise.
• Wiring – Use shielded twisted‑pair for dynamic signals and Keyphasor. Keep sensor and power wiring segregated from VFD outputs.
• Configuration – Set machine‑specific alarm setpoints, OK thresholds, and startup inhibit. Verify 4–20 mA scaling at the control system.
• Routine checks – Inspect probe gaps and mounting torque, clean terminals, confirm relay operation during planned shutdowns.
• Firmware & backups – Keep configuration files backed up and, where applicable, confirm firmware compatibility before updates.

A maintenance lead at a chemical plant told us they swapped in a 1900/65A during a short outage and had Modbus data trending in SCADA the same afternoon. The buffered outputs made their acceptance testing faster than expected.

Compatible Sensors & Accessories (Examples)

• Bently Nevada 330180 – 3300 XL Proximitor Sensor for 5 mm/8 mm probe systems
• Bently Nevada 330130 – 3300 XL Extension Cable (various lengths/options)
• 3300 XL Proximity Probes – 5 mm or 8 mm tip probes for shaft vibration and axial position
• Bently Nevada 330500 Velomitor – Industrial velocity transducer for casing vibration

Quality & Certifications

• CE compliant
• UL/cUL (typical for industrial monitoring assemblies)
• RoHS conformant build in most configurations
• Manufactured under ISO 9001 quality systems
• Our warranty: 365 days