Description

Bently Nevada 1900/55-02-01-01-00

I. Basic Information

Model: 1900/55-02-01-01-00

Brand: Bently Nevada

Supported Platform: 1900 Series Standalone Rotating Machinery Protection Monitoring System. It can operate independently without a 3500 rack and is specially designed for auxiliary equipment such as fans, water pumps and small compressors.

Product Type: 4-channel standalone fan vibration monitoring controller compatible with Velomitor velocity vibration sensors. It can collect equipment vibration severity and rotational speed signals in real time, equipped with local LCD display, keypad configuration, relay alarm output and 4-20mA analog transmission output. It can independently realize over-limit alarm and interlock shutdown protection, serving as the core instrument spare part for condition monitoring and mechanical protection of auxiliary equipment in power plants, chemical and metallurgical industries.

Model Code Interpretation

1900/55: 4-channel vibration monitoring controller dedicated to fans in the 1900 Series, compatible with velocity sensors for low-frequency vibration measurement (1.5Hz~1000Hz)

1st digit 02: AC 110/220V wide voltage power supply version

2nd digit 01: Configuration with 4-channel relay alarm contact outputs

3rd digit 01: 4 independent 4-20mA analog transmission outputs

4th digit 00: Standard industrial cabinet mounting type without special explosion-proof certification

Product Positioning

1900/55-02-01-01-00 is a compact standalone monitoring instrument launched by Bently Nevada for small and medium-sized rotating auxiliary equipment. It requires no supporting rack and can be flush-mounted directly in on-site control cabinets. It supports connection of 4 Velomitor magnetoelectric velocity sensors to continuously monitor vibration of fan bearings and gearboxes. Equipped with front-panel keypad configuration and real-time backlit LCD data display, it allows flexible setting of two-level alarm thresholds (warning and danger). Relay contacts act upon faults to implement local audible and visual alarm and equipment interlock shutdown protection, while vibration signals are converted into isolated standard 4-20mA signals and uploaded to the DCS control system.

The device adopts an industrial dust-proof reinforced design with PCB three-proof coating and excellent EMC performance, adapting to harsh on-site conditions of high temperature, dust, oil contamination and large voltage fluctuation. It enables early prediction of bearing wear, impeller unbalance and gear meshing faults, effectively avoiding major safety accidents such as fan blade fracture and rotor runaway, and greatly reducing the probability of unplanned shutdowns of auxiliary equipment in power, chemical and metallurgical industries.

Hardware Architecture

The controller features an integrated dust-proof metal housing with a human-machine interaction front panel, isolated strong and weak current layout inside, and PCB coated with three-proof protective coating. Its hardware consists of six core units:

4-Channel Sensor Signal Acquisition & Conditioning Unit

It simultaneously receives AC signals from 4 magnetoelectric velocity sensors. Built-in programmable multi-stage band-pass filter circuits accurately extract low-frequency vibration signals ranging from 1.5Hz to 1000Hz, adapting to low-speed operating conditions above 90RPM. It effectively filters industrial frequency and high-frequency harmonic interference, converting weak raw vibration signals into standardized digital measured data after amplification and filtering.

High-Speed Data Calculation & Configuration Processing Unit

Equipped with an industrial-grade high-precision signal processing chip, it performs real-time conversion of vibration severity RMS values and calculation of rotational speed pulse frequency. All parameters including channel range, alarm thresholds, filter parameters, 4-20mA transmission range and alarm delay can be configured locally via front-panel keys without upper computer software. A built-in non-volatile power-fail storage circuit permanently retains all configuration parameters after power failure.

LCD Display & Human-Machine Interaction Unit

The backlit front-panel LCD screen cycles through real-time vibration values of 4 channels, current warning/danger alarm status and hardware fault codes. Function keys support parameter modification, manual alarm reset, channel performance test, measurement range calibration, as well as local one-click parameter clearing and factory reset.

Relay Interlock Output Unit

Four independent passive normally open relay contacts are integrated, with each channel configurable for two-level alarm logic. Contacts close reliably once the measured value exceeds the threshold, directly connecting to the equipment safety interlock loop to trigger local audible and visual alarms and emergency shutdown. The contacts adopt software anti-chatter delay function to prevent false alarms and false interlocks caused by transient electromagnetic interference.

4-20mA Isolated Analog Transmission Unit

Four mutually electrically isolated standard DC analog output channels linearly map each vibration measurement to a 4~20mA industrial standard signal with maximum load of 500Ω. The isolation design prevents reverse interference from the DCS control system, enabling centralized remote monitoring, trend storage and fault trace analysis of plant-wide auxiliary equipment vibration data.

Wide-Voltage Industrial-Grade Power Supply & Protection Unit

It supports universal AC 110/220V wide voltage power supply, integrating multiple hardware protections including surge suppression, reverse connection, short circuit and overvoltage. Compliant with CE EMC standards, the grounded metal housing and PCB three-proof coating resist on-site voltage fluctuation, electrostatic impact and radio frequency electromagnetic interference.

Mounting Specifications

Mounting Method: Standard flush cabinet panel mounting matching the cutout size of industrial control cabinets
Overall Dimensions: Front panel 249mm × 182mm, mounting depth 85mm
Net Weight: Approx. 1.45kg
Panel Interfaces: LCD screen, function setting keys, channel status indicators; Rear Terminals: 4×sensor input terminals, AC power terminals, 4×4-20mA analog output terminals, 4×relay alarm terminals
Configuration Mode: Local full-parameter keypad configuration without upper software; supports local parameter backup and one-click factory reset
Compatible Sensors: Bently Velomitor series magnetoelectric velocity sensors (Model 190501)
Recommended Accessories: Double-shielded dedicated sensor signal cables, power lightning surge filter terminals, relay surge absorbers, cabinet grounding copper bars

Supporting System

Supporting Hardware

Velomitor magnetoelectric velocity vibration sensors, 110/220VAC power supply loop, double-shielded signal cables, on-site audible and visual alarms, DCS analog acquisition cards, equipment safety interlock relay loops.

Commissioning Tools

High-precision digital multimeter, vibration signal generator, insulation resistance tester, torque wrench, velocity sensor calibrator.

Upper-Level Connection System

DCS distributed control system for thermal/chemical/metallurgical plants, equipment online condition monitoring platform, realizing real-time vibration data collection, historical trend storage, remote over-limit alarm and rotating equipment fault diagnosis and traceability.

Typical Application Industries

Induced draft fans, forced draft fans, primary air fans and circulating water pumps in thermal power plants; dust removal fans and main exhaust fans in metallurgical blast furnaces; compressors, cooling fans and circulating pumps in chemical process plants; aeration fans in sewage treatment plants and various auxiliary equipment for waste heat power generation.

Product Features

4-Channel Independent Synchronous Monitoring for One-Stop Bearing Protection
A single controller synchronously monitors four vibration measuring points including fan drive end, non-drive end and gearbox. Each channel features independent parameter configuration with electrical isolation between channels, enabling complete vibration safety protection for an entire fan unit with one instrument.
Full Local Keypad Configuration for Efficient On-Site Commissioning Without Upper Software
All operating parameters can be set via front-panel keys, supporting customized vibration range, two-level alarm thresholds, high/low-pass filter frequency, 4-20mA upper/lower limits and alarm anti-chatter delay. Parameters are permanently saved after power failure, allowing rapid configuration replication during spare part replacement to shorten downtime.
Low-Frequency Optimized Signal Acquisition for Accurate Measurement of Low-Speed Rotating Equipment
The minimum measurable frequency reaches 1.5Hz, stably collecting vibration signals of fans and large circulating pumps operating above 90RPM, solving the problems of low-frequency signal distortion and frequent value fluctuation of traditional monitoring instruments.
Dual Output of Isolated Analog Signal + Passive Relay for Dual Local & Remote Protection
Four isolated 4-20mA signals upload data to DCS for remote centralized monitoring, while four passive relay contacts implement on-site equipment safety interlock protection. Electrical isolation between acquisition and analog output loops meets both plant-wide centralized management and on-site emergency shutdown requirements.
AC Wide-Voltage Reinforced Design for Industrial Sites With Severe Voltage Fluctuation
Universal 110/220V AC power supply adapts to on-site large voltage fluctuation. Equipped with multiple power hardware protections, dust-proof, moisture-proof and anti-interference metal shielding and PCB three-proof coating, it supports 24/7 uninterrupted stable operation.
Full-Channel Hardware Fault Self-Diagnosis for Rapid On-Site Troubleshooting
Built-in self-test functions detect sensor open/short circuit, signal over-range, abnormal power supply and hardware channel faults. Corresponding indicators light up and fault codes are locked upon failure, enabling maintenance personnel to quickly locate common faults such as cable damage and sensor failure.

II. Technical Specifications

2.1 Electrical Parameters for Signal Acquisition

Measuring Channels: 4 mutually independent velocity vibration input channels
Compatible Sensors: Velomitor magnetoelectric velocity sensors with AC voltage input
Measuring Frequency Range: 1.5Hz ~ 1000Hz (±3dB bandwidth)
Standard Measuring Range: 0~50mm/s (user-configurable via front panel)
Measuring Accuracy: ≤±1% FS
Filter Mode: Programmable digital high-pass and low-pass filters to suppress power frequency interference
Rotational Speed Measurement: Calculable via vibration pulse signals

2.2 Output Interface Parameters

Analog Output: 4 electrically isolated 4~20mA DC outputs with independent range mapping per channel, maximum load 500Ω
Relay Output: 4 normally open passive relay contacts, contact rating 250VAC/5A, 30VDC/5A; supports alarm anti-chatter delay setting
Alarm Mode: Two independent threshold levels (Warning / Danger) per channel; configurable for alarm latch or auto-reset

2.3 Power Supply Electrical Parameters

Rated Operating Power Supply: Universal AC 110/220V wide voltage power supply
Allowable Voltage Fluctuation: 85VAC ~ 264VAC
Total Rated Power Consumption: ≤15W
Power Supply Protection: Hardware protection against reverse connection, overvoltage, surge and short circuit

2.4 Environmental Specifications

Standard Operating Temperature: -10℃ ~ +55℃ (fully loaded operation in sealed cabinets)
Storage & Transportation Temperature: -25℃ ~ +70℃
Operating Relative Humidity: 5% ~ 95% RH, non-condensing, no corrosive industrial gas
Ingress Protection Rating: IP30 (front panel dust-proof; for installation only in sealed industrial control cabinets)
MTBF (Mean Time Between Failures): ≥250000 hours

2.5 Mechanical & Physical Parameters

Mounting Method: Flush panel mounting in industrial control cabinets
Front Panel Dimensions: 249mm (W) × 182mm (H), mounting depth 85mm
Net Weight: 1.45kg
Housing Material: Electrostatic sprayed dust-proof cold-rolled steel plate with internal isolated layout for strong and weak currents
Protection Process: PCB coated with three-proof anti-corrosion paint; electrical isolation for power and analog loops

III. Key Features

Continuous Independent Low-Frequency Vibration Monitoring over Four Channels
Collect vibration severity data at multiple bearing measuring points of fans and pumps synchronously, accurately capturing early fault characteristics such as bearing pitting, gear wear and rotor unbalance of low-speed equipment to provide precise raw measurement data for predictive maintenance.
Full Parameter Configuration & Real-Time Operating Status Display via Local Front Panel
All channel parameters and alarm thresholds can be set via front-panel keys without upper software. The LCD displays real-time 4-channel vibration values, alarm status and fault codes, supporting local manual alarm reset and measurement channel calibration.
Two-Level Threshold Alarm + Relay Safety Interlock Protection
Warning and danger thresholds can be set independently for each channel. Passive relay contacts act upon fault triggering to connect audible & visual alarms and unit interlock loops, reminding maintenance personnel for inspection and triggering automatic shutdown under extreme fault conditions to prevent severe equipment damage.
Remote Data Upload via Four Isolated Standard 4-20mA Signals
Each measured signal is converted into industry-standard analog quantity with electrical isolation to avoid cross-system interference. Vibration data is uploaded to the DCS system for centralized plant-wide auxiliary equipment monitoring, trend analysis and fault traceback.
Hardware-Level Full-Channel Fault Self-Check & Power-Fail Parameter Storage
Real-time monitoring of sensor open/short circuit, abnormal power supply and signal over-range faults with locked fault codes for convenient on-site troubleshooting. All configuration parameters are stored in non-volatile memory and retained after power failure or restart.
Standard Industrial Interface for Rapid On-Site Spare Part Replacement
Unified panel mounting cutout size and rear terminal definitions allow direct in-situ replacement of same-model controllers. Only parameter entry is required for commissioning without modification to cabinet wiring or interlock loops, significantly shortening equipment maintenance downtime.

IV. Working Principle

After power-on self-test, firmware initialization and parameter loading, the controller enters normal measurement operation once self-check passes. The four acquisition channels continuously receive alternating vibration signals output by Velomitor magnetoelectric sensors. Internal conditioning circuits filter, amplify and digitize raw signals, and the main control chip converts AC vibration signals into RMS vibration severity values calibrated according to user-defined panel ranges.

Real-time measurement data is displayed cyclically on the front LCD panel and compared with preset warning and danger thresholds for each channel. When readings exceed thresholds, corresponding channel indicators illuminate, internal relay contacts close to output interlock switch signals, and vibration values are linearly converted into isolated 4~20mA analog signals uploaded to the DCS control system.

The device continuously monitors sensor input signals, supply voltage and hardware loop operating status during operation. Once sensor open/short circuit, power supply anomaly or signal over-range is detected, fault codes are locked and alarm prompts activated. All user-configured range, alarm and filter parameters are stored in non-volatile memory and permanently retained after power loss to restore original operating configurations upon restart, providing stable vibration monitoring and safety interlock protection for all types of rotating auxiliary equipment.

V. Application Scenarios

Boiler Auxiliary Equipment Monitoring in Thermal Power Plants: Four-channel bearing vibration monitoring, over-limit alarm and interlock protection for induced draft fans, forced draft fans, primary air fans, pulverized coal exhaust fans and circulating water pumps.
Petrochemical Process Equipment: Online vibration monitoring for cooling fans, air compressors, circulating pumps and Roots blowers to realize early equipment fault warning and prevent unplanned plant shutdowns.
Large Fan Equipment in Metallurgical & Cement Industries: Bearing vibration protection for blast furnace dust removal fans, kiln exhaust fans and raw material conveying fans to ensure stable operation of continuous production lines.
Auxiliary Equipment for Sewage Treatment & Waste Heat Power Generation: Condition monitoring for aeration fans, circulating water pumps and condensate pumps to realize unattended remote monitoring of plant auxiliary machinery.
Technical Retrofit & Replacement of Legacy Field Instruments: Upgrade of traditional pointer vibration meters and simple alarm devices via in-situ installation, reusing original sensors, interlock and DCS wiring loops to reduce retrofit construction and commissioning costs.