Bently Nevada 1900/27 Series Vibration Monitor – Compact, Reliable Protection for General-Purpose Rotating Machinery

The Bently Nevada 1900/27 Series is a compact vibration monitor designed for day-to-day machinery protection on pumps, fans, small gearboxes, and compressors. From my experience, it’s a smart fit when you need dependable trip logic and clean 4–20 mA signals to your DCS, without the cost and complexity of a full rack system. You might notice that it typically pairs well with standard Bently sensors (proximity, velocity, or accelerometers), giving you flexibility to match whatever transducers you already use onsite.

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Key Features

• Two-channel vibration monitoring – Typically supports casing vibration or shaft vibration depending on the sensor type used.
• Alert/Danger alarm setpoints – Independent thresholds with relay outputs for straightforward trip logic on critical assets.
• 4–20 mA process outputs – Per-channel analog signals for DCS/PLC trending; makes it easy to baseline and track changes over time.
• Buffered transducer outputs – Convenient for portable data collectors when you want deeper diagnostics without disturbing the wiring.
• Compact DIN-rail design – Saves cabinet space and simplifies brownfield upgrades in crowded panels.
• 24 VDC power – Common plant supply; in many cases you can reuse existing rails and power supplies.
• Broad sensor compatibility – Typically works with Bently Nevada proximity probes (via Proximitor), velocity sensors, or IEPE accelerometers.
• Rugged, industrial build – Designed for continuous operation in plant environments with stable performance and straightforward maintenance.

Technical Specifications

Brand / Model	Bently Nevada 1900/27 Series Vibration Monitor
HS Code	9031.80 (measuring/checking instruments – vibration monitoring, typical classification)
Power Requirements	24 VDC nominal (commonly 18–30 VDC)
Signal Inputs	2 vibration channels; accepts proximity (via Proximitor), velocity, or IEPE accelerometer inputs (typical)
Signal Outputs	2 × 4–20 mA process signals; 2 × alarm relays (SPDT); buffered transducer outputs
Communication Interfaces	N/A on standard units (monitoring via analog/relay)
Operating Temperature	Typically -20°C to +65°C
Installation Method	DIN EN 50022 (35 mm) rail; cabinet/panel mount
Dimensions & Weight	Compact DIN-rail module; approx. 120 × 100 × 25 mm; ~0.4 kg (typical)

Application Fields

The 1900/27 seems to be most at home on small to mid-size rotating equipment where you need dependable protection and simple integration:

• Water and wastewater pumps (end-suction, vertical turbine, multistage)
• HVAC and process fans/blowers in facilities and plants
• Light-duty compressors and package skids
• Gearboxes on conveyors and agitators
• Cooling tower drives and circulating pumps

A maintenance supervisor at a chemical site told me they used it to replace standalone vibration switches—fewer nuisance trips, plus trending via 4–20 mA gave them early warning on a failing bearing. That’s typically where this unit shines.

Advantages & Value

• Reliable protection – Alert/Danger logic with robust relays reduces risk of unplanned downtime.
• Simple integration – 4–20 mA outputs drop straight into your DCS/PLC without extra converters.
• Sensor compatibility – Works with widely used Bently Nevada transducers, so spares and replacements are straightforward.
• Lower installed cost – DIN-rail format and 24 VDC power typically cut panel real estate and wiring time.
• Maintainability – Buffered outputs make on-the-spot diagnostics easy with a portable analyzer.

Installation & Maintenance

• Cabinet and mounting – Mount on 35 mm DIN rail inside a ventilated control cabinet; allow clearance for wiring and heat dissipation.
• Power and grounding – Use a clean, regulated 24 VDC supply; bond the ground per plant standards to minimize noise pickup.
• Sensor wiring – Keep transducer cables shielded and routed away from VFD outputs; follow Bently Nevada practices for proximity/IEPE wiring.
• Alarm setup – Set Alert/Danger levels based on baseline vibration data; review after first week of operation to fine-tune.
• Routine checks – Quarterly functional test of relays and OK status; verify 4–20 mA scaling in the DCS.
• Cleaning & updates – Keep terminals clean and tight; apply firmware updates if applicable to your hardware revision.

Compatible Sensors & Accessories (Common Pairings)

• Bently Nevada 3300 XL proximity probe systems (shaft vibration/position via Proximitor)
• Bently Nevada 330500 Velomitor velocity sensors (casing velocity on pumps/fans)
• Bently Nevada industrial IEPE accelerometers (casing acceleration on motors/gearboxes)
• Buffered output leads and terminal accessories for field diagnostics

One thing I appreciate is how the 1900/27 typically lets you reuse existing plant-standard sensors, so you’re not locked into a costly changeover.

Quality & Certifications

• CE marked for EMC and safety (manufacturer documentation)
• UL/cUL recognition for industrial control equipment in many configurations
• RoHS compliance for most standard builds
• Manufacturer’s warranty: 12 months (365 days)

If you’re standardizing across multiple skids or replacing legacy vibration switches, the Bently Nevada 1900/27 Series offers a clean, trustworthy path—compact footprint, clear alarms, and the data your operators can actually use.