Product Specification Document: Bently Nevada 1900/55

1. Product Overview

2. Basic Product Information

Manufacturer and Model Identity

• Manufacturer: Bently Nevada (Baker Hughes)

• Model Number: 1900/55

• Product Series: 1900 Series Compact Machinery Monitors

• Product Type: Standalone Vibration/Fan Monitor

• System Compatibility: Bently Nevada 3300 XL proximity probes, velocity transducers, ICP accelerometers; DCS/PLC via Modbus RTU

• Country of Origin: United States

Electrical Characteristics

• Power Supply: 90–250 VAC (50/60 Hz) or 18–36 VDC; ≤15 W power consumption

• Vibration Inputs: 2 channels (proximity, velocity, ICP acceleration; 10 Hz–1 kHz bandwidth)

• Speed Input: 1 channel (TTL/HTL pulse, 0–30 kHz)

• Relay Outputs: 2 programmable SPDT relays (5 A @ 250 VAC resistive load)

• Analog Output: 1 channel (4–20 mA, isolated, scalable)

• Isolation: 1500 VAC input-to-output galvanic isolation

Physical and Mechanical

• Enclosure: Rugged metal chassis, EMI-shielded, conformal-coated PCB

• Dimensions: 165 mm × 140 mm × 55 mm (6.5 in × 5.5 in × 2.2 in)

• Net Weight: ~0.8–1.2 kg (1.76–2.65 lb)

• Mounting: Panel-mount or 35mm DIN-rail (vertical/horizontal); front-panel LCD and keypad

• Front Panel: 2-line LCD, 4 navigation keys, LED indicators (Power, Alert, Danger, Fault)

• Terminations: Rear screw terminals for I/O and power; accommodates 12–22 AWG wiring

• Enclosure Rating: IP20 (indoor use; finger-contact protected)

Environmental Limits

• Operating Temperature: −20°C to +70°C (−4°F to +158°F)

• Storage Temperature: −40°C to +85°C (−40°F to +185°F)

• Relative Humidity: 5%–95% RH (non-condensing)

• Vibration Resistance: 5 g (10 Hz–500 Hz); 10 g shock (11 ms half-sine)

• EMI Immunity: Meets IEC 61000-6-2/4; CE marked, cULus certified

Compliance and Certification

• Standards: API 670, ISO 10816, IEC 61000-6-2/4

• Certifications: CE, cULus, CSA, RoHS compliant

• Quality: ISO 9001 manufacturing; 100% factory calibrated and tested

• Lifecycle Status: Active production; supported for new installations and retrofits

3. Function and Product Positioning

Core Functions

• Dual-Channel Vibration Monitoring: Simultaneously measures casing vibration (velocity/acceleration) or shaft vibration (displacement) for comprehensive health tracking.

• Speed Monitoring: Tracks rotational speed to detect overspeed/underspeed conditions and enable speed-dependent alarm thresholds.

• Configurable Alarm Logic: 2 independent relays with latching/non-latching operation, adjustable alert/danger setpoints, and voting logic for customized protection.

• Real-Time Data & Diagnostics: Local LCD display for live vibration, speed, and alarm status; event logging for fault history and predictive maintenance analysis.

• Industrial Communication: Modbus RTU (RS-485) for seamless integration with DCS/PLC, enabling remote monitoring and data trending.

Operational Features

• Sensor Compatibility: Supports 3300 XL proximity probes (shaft displacement), 9200 series velocity transducers (casing vibration), and ICP accelerometers (high-frequency vibration).

• Local Configuration: Front-panel keypad for on-site setup of sensor type, measurement range, alarm thresholds, and communication parameters.

• Fault Detection: Monitors for sensor open/short circuits, signal overload, and power supply faults; reports via front-panel LED and Modbus.

• Conformal Coating: PCB protected against moisture, dust, and chemical contaminants for harsh industrial environments.

Product Positioning

• Cooling tower fans, industrial blowers, small pumps, and auxiliary compressors in power, oil and gas, and petrochemical industries.

• API 670-compliant protection for non-critical machinery where 3500-series rack systems are unnecessary.

• Retrofit projects replacing outdated single-function monitors with multi-parameter capability.

• Standalone or remote monitoring applications with limited panel space or budget constraints.

4. Core Performance Parameters

Measurement Performance

• Vibration Range: Velocity (0.1–200 mm/s RMS), Acceleration (0.01–50 g peak), Displacement (1–1000 μm peak-peak)

• Vibration Accuracy: ±1% FS (ISO 2954 compliant)

• Frequency Response: 10 Hz–1 kHz (vibration channels)

• Speed Range: 0–30 kHz (TTL/HTL pulse input)

• Speed Accuracy: ±0.01% FS

Relay & Output Performance

• Relay Configuration: 2 × SPDT (common, NO, NC)

• Relay Rating: 5 A @ 250 VAC (resistive); 3 A @ 30 VDC

• Analog Output: 4–20 mA (isolated, scalable to vibration or speed)

• Analog Output Accuracy: ±0.1% FS

Communication Performance

• Protocol: Modbus RTU (RS-485, 2-wire)

• Baud Rate: 9600/19200 bps (configurable)

• Data Update Rate: 100 ms (real-time data)

• Max Nodes: 32 (Modbus RTU network)

Reliability

• MTBF: >150,000 hours (25°C, continuous operation)

• Warranty: 1 year (standard); extended warranties available

• Maintenance: No scheduled maintenance; periodic calibration verification recommended every 2–3 years

5. General Matching Accessories

Installation & Mounting

• Panel-mount or DIN-rail hardware (standard with unit)

• Shielded sensor cables (proximity: 3300 series; velocity: 84661)

• EMI-shielded cable glands (rear panel wiring entry)

System Compatibility

• Bently Nevada 3300 XL Proximity Probes (shaft vibration/displacement)

• 9200 Series Velocity Transducers (casing vibration)

• ICP Accelerometers (high-frequency vibration monitoring)

• DCS/PLC with Modbus RTU (RS-485) communication

Maintenance & Spares

• Relay replacement kit (2 SPDT relays)

• Conformal coating touch-up kit (PCB protection)

• Front-panel LCD/keypad replacement kit

• Factory calibration certificate (included with new units)

Documentation

• 1900/55 Datasheet and Installation Manual

• API 670 Compliance Application Note for Auxiliary Machinery

• Modbus RTU Communication Protocol Guide

• Factory test and calibration report (included with unit)

6. Applicable Equipment and Industry Fields

Primary Applications

• Power Generation: Cooling tower fans, boiler feed pumps, and auxiliary blowers in thermal and combined-cycle power plants.

• Oil and Gas: Ventilation fans, small centrifugal pumps, and auxiliary compressors in refineries, LNG facilities, and offshore platforms.

• Petrochemical: Process fans, agitators, and cooling blowers in chemical processing plants.

• HVAC & Building Services: Large industrial fans and blowers in commercial facilities and data centers.

Secondary Applications

• Water/Wastewater: Aeration blowers and large circulation pumps in treatment facilities.

• Heavy Industry: Steel mill cooling fans and material handling system blowers.

• Pulp and Paper: Paper machine drive fans and exhaust blowers.

• Mining: Ventilation fans and conveyor drive motors in underground and surface operations.

Compatibility Notes

• Not for Critical Machinery: Designed for auxiliary equipment; not intended for turbines or critical compressors (use 3500-series systems).

• Sensor Power: Proximity probes require external 24 VDC power; velocity/ICP sensors are passive or require 24 VDC excitation.

• Communication Wiring: RS-485 Modbus requires twisted-pair shielded cable for noise immunity.

• Environmental Limits: Avoid exposure to direct moisture, corrosive gases, or temperatures beyond −20°C to +70°C。