Baker Hughes 1900/65A General Purpose Equipment Monitor

Baker Hughes 1900/65A Universal Equipment Monitor: Provides intelligent protection and monitoring for critical equipment

In modern industrial environments, the fault free continuous operation of rotating machinery, critical process equipment, and other important assets is a core element in ensuring production efficiency and reducing operating costs. Real time perception and warning of equipment status can effectively avoid unplanned downtime and shift maintenance mode from passive response to proactive prevention. Bently Nevada, as a leader in the field of condition monitoring, has launched the 1900/65A Universal Equipment Monitor, which is a low-cost, high-performance solution designed to meet this widespread demand. This article will provide a comprehensive and in-depth analysis of the technical characteristics, functional modules, configuration methods, and application scenarios of the 1900/65A monitor based on the official data manual (document number: 173401 Rev. AC).

Product Overview: An Economic Choice for Integrated Monitoring

The core design concept of the 1900/65A universal equipment monitoring instrument is to provide continuous and reliable monitoring and protection for various universal equipment and process at an affordable cost. It breaks the traditional threshold of complex and expensive high-end monitoring systems, integrating key monitoring functions into a compact module. Whether it is fans, pumps, motors, or other auxiliary mechanical equipment, the 1900/65A can protect equipment assets and extend their service life by monitoring their operating status in real time and issuing alarms at the early stages of faults. Its design balances performance and cost, making it an ideal tool for promoting state monitoring in a wider range of application scenarios.

Input and output: flexible physical interface

The powerful features of the 1900/65A are first reflected in its diverse input/output (I/O) configuration, which enables it to connect multiple types of sensors and transmit processed information to control systems or maintenance personnel in different ways.

sensor input

Vibration/displacement input: The device provides four software configurable transducer input channels (channels 1-4). This means that users do not need to replace hardware and can configure it through software to support the following sensors:

2-wire and 3-wire accelerometers: used to measure shell vibration, suitable for rolling bearings, gearboxes, etc.

Speed sensor: used to measure vibration speed, commonly used for general mechanical vibration assessment that complies with ISO standards.

Eddy current displacement sensor: used to measure the relative vibration, axial displacement (thrust), and rotational speed of the shaft relative to the bearing.

Temperature input: The device provides four additional dedicated temperature input channels (channels 5-8). It has wide compatibility and can be directly connected to various common temperature sensors:

Thermocouple: Supports E, J, K, and T-type thermocouples, covering a wide range of industrial measurements from low to high temperatures.

Thermistor (RTD): Supports 2-wire or 3-wire RTDs, such as 100 Ω platinum resistors (Pt100), providing higher measurement accuracy.

signal output

Relay output: The monitor is equipped with six relay outputs. Users can use the 1900 Configuration software to write logical statements to control the action (normally open or normally closed) of each relay based on the "OK", "Alert", and "Danger" states of the monitoring channel. This provides a reliable hard wired approach for directly cutting off power, triggering sound and light alarms, or initiating interlock protection.

4-20 mA Recorder Output: Provides four 4-20 mA analog output channels. Each channel can be configured to map any variable (such as vibration amplitude, temperature value) of any monitoring channel. This enables existing PLCs, DCS, or recording instruments to seamlessly access critical process data and achieve centralized data monitoring.

Buffer output: Each sensor input channel has a dedicated buffer output. This output provides raw sensor signals without scaling, with low impedance (550 Ω) and strong anti-interference ability, making it convenient for users to connect handheld analyzers or external devices for more in-depth signal analysis, such as spectrum analysis.

Communication and Configuration: The Core of Digitization and Intelligence

In the era of Industry 4.0, the interconnectivity of devices is crucial. The 1900/65A seamlessly integrates into the architecture of digital factories through its powerful communication and configuration options.

Modbus communication capability

An important feature of the 1900/65A is its Modbus Gateway option. Through this feature, the monitor can become a Modbus server, providing rich internal data to any Modbus client such as DCS, SCADA, PLC, or System 1 * mechanical management software. These data include:

Static variables (such as 4-20mA corresponding values).

The status of channels and variables (normal, alarm, danger).

Event List.

Time and date information (synchronized through internal counters or Modbus master station time).

In terms of communication, the 1900/65A supports Modbus communication through Ethernet and a software configurable RS232/485 serial port, greatly simplifying integration with upper level control systems. For early versions that did not come pre installed with this feature, users can upgrade through the 1900/01 communication upgrade kit.

Flexible configuration method

Software based configuration: Users can create complete configuration files by running 1900 Configuration Software on a laptop or PC. This software provides an intuitive interface for defining channel types, variables, alarm settings, filters, relay logic, and Modbus register mapping tables. The configuration file is downloaded to the monitor through the built-in Ethernet port of the device. The device will permanently store configuration information in non-volatile memory and can upload existing configurations to the PC for modification or backup.

Optional display module: To meet the needs of on-site operations, the 1900/65A supports connecting an optional display/keyboard module. This module is equipped with an LCD display screen and LED indicator lights (normal, alarm, danger, bypass, multiplier, etc.), allowing operators to view channel information and status on site and make minor configuration modifications. It is worth mentioning that the display module can be installed separately from the host module through a cable of up to 75 meters, providing great installation flexibility. For example, the host can be installed inside the control cabinet, while the display panel can be installed outside the cabinet for easy observation.

In depth technical specifications: channel types and signal processing

The strength of the 1900/65A lies not only in its hardware interface, but also in its pre-set channel types for different application scenarios. Each channel type contains specialized signal processing algorithms and variable definitions.

Acceleration/reciprocating acceleration channel

Application: Suitable for monitoring high-frequency vibrations of bearings, gearboxes, etc.

Variables: Each channel can continuously process up to four variables.

Vibration variable: up to three amplitude measurements with bandpass filtering.

Acceleration Enveloping: An envelope algorithm can be applied to a variable, which can effectively extract high-frequency impact signals caused by bearing faults or gear meshing problems that are masked by low-frequency vibrations.

Bias voltage: monitors the bias voltage of the sensor and is used to diagnose the integrity of the sensor and its cables.

Configuration options: Peak/RMS, metric/imperial units, configurable high/low-pass filters (up to 25kHz), full range. The acceleration variable can be integrated to obtain the velocity value.

Accuracy: ± 1% of full scale.

Speed/reciprocating speed channel

Application: Suitable for general mechanical vibration assessment that complies with standards such as ISO 10816.

Variables: Supports up to four variables, including up to three bandpass filtered speed variables and bias voltage monitoring.

Configuration options: Peak/RMS, units, filter (up to 5.5kHz), full range. The velocity variable can be integrated to obtain the displacement value.

Accuracy: ± 1% of full scale.

Radial vibration channel

Application: Use eddy current sensors to measure radial vibration of shafts.

Variables: Provides direct vibration (bandpass filtering), gap voltage (Gap), and optional vibration variables.

Filter: A specially designed direct filter (such as 1-600Hz, 4-4000Hz) is used to measure shaft vibrations at different frequencies (such as unbalance, misalignment, oil film vortex).

Accuracy: ± 1% of full scale.

Thrust/Position/Speed Channel

Thrust: Measure the axial displacement of the shaft. Provide position and gap variables.

Location: Measure the general mechanical position. Provide position and gap variables.

Speed: Measure the speed using eddy current sensors or magnetic sensors. Up to four speed measurements can be performed, supporting the setting of events per revolution (EPR), with an accuracy of up to ± 0.5 RPM+0.015% reading.

temperature input

Processing: Each channel processes a temperature variable, equipped with a 50Hz analog low-pass filter and a powerful digital notch filter (with a minimum attenuation of 100dB for 50/60Hz and its first 5 harmonics), effectively suppressing power frequency interference.

Accuracy: For thermocouples, the typical accuracy at room temperature is ± 1 ℃; For a 3-wire RTD, the accuracy is ± 1.5 ℃+0.5% of full scale.

Logic, Control, and Electrical Characteristics

Advanced Relay Logic

The relay logic function of 1900/65A far exceeds simple "AND gate" triggering. It allows users to use logical operators (AND, OR, True AND) to combine logical operands from any channel (such as channel alarms, variable hazards, monitor failures, etc.) into complex logical statements to control each relay. Each relay can contain up to 50 operands and supports independent configuration as self-locking/non self-locking, excitation/de excitation, providing great control flexibility.

Remote control input

Suppress/Multiply Input: A multifunctional input that can be software configured as "Suppress" or "Multiply". As a suppression, it is used for temporary bypass alarms, such as during start-up and shutdown processes. As a multiplier, short circuiting this input can multiply the alarm setpoint by a factor (Trip Multiply) to adapt to transient operating conditions.

Reset Input: Used for remotely resetting all self-locking alarms and relays.

Sensor power supply and interface

Two wire current mode: Provides a constant current source (3.3mA ± 5%) to power the two wire IEPE sensor.

Three wire voltage mode: Provides -24Vdc voltage to power the three wire sensor, with short-circuit protection function (maximum short-circuit current of about 23.6 mA).

4-20 mA and buffer output

4-20mA: The output is proportional to the full-scale range of the selected variable, with an update rate of 100ms and a resolution of 10mA. It can be configured to output clamp current (default 2mA) when the channel is "non OK" or "bypass".

Buffer output: The output impedance is 550 Ω, ensuring the fidelity of signal transmission. The minimum buffer output bandwidth on the host module is 40 kHz.

Physical specifications and environmental adaptability

The 1900/65A design is sturdy and adaptable to harsh industrial environments.

Power supply: Supports a wide range of 18-36 Vdc input, with a typical power consumption of 8.5W.

Environment: The working temperature range is -20 to+70 ° C, the storage temperature is -30 to+90 ° C, and it can operate at 95% non condensing humidity.

Installation method: DIN rail installation, wall mounted (Bulkhead) installation, and NEMA 4X/IP66 waterproof and dustproof housing (with observation window) options are available, suitable for various indoor and outdoor occasions.

Mechanical dimensions: The host module is compact in size, measuring 196.9 mm x 149.4 mm x 74.4 mm, making it easy to install in control cabinets with limited space.

Compliance and Industry Certification

As an industrial product aimed at the global market, the 1900/65A has passed multiple strict certifications to ensure its safety and reliability.

Electromagnetic compatibility (EMC): Complies with EN 61000-6-2 (anti-interference) and EN 61000-6-4 (emission standards).

Electrical safety: Complies with EN 61010-1 standard.

Hazardous Area Certification:

CSA/NRTL/C: Suitable for Class I, Division 2, Groups A, B, C, D, as well as Class I, Zone 2 and other hazardous areas in North America.

ATEX/IECEx: Obtained explosion-proof certifications such as Ex nA nC IIC Gc, allowing for use in corresponding European and international hazardous areas.

Special precautions: When installing in hazardous areas, ensure that the relay contact voltage is below 30 Vac rms or 30 Vdc, and the current is below 5 A to minimize risks.

RoHS: Compliant with the EU Directive on the restriction of the use of certain hazardous substances in electronic and electrical equipment.

Order information and attachments

The ordering code 1900/65A-AA-BB-CC-DD-EE for 1900/65A clearly defines the configuration of the device:

AA (power option): 00=18-36 Vdc; 01=110-220 Vac (requires external power supply).

BB (display option): 00=no display; 01=direct installation; 02-05=Display module with cables of different lengths and types.

CC (installation option): 00=none; 01=DIN rail; 02=Wall mounted board; 03=NEMA 4X/IP66 enclosure; 04=1900/55 replacement kit, etc.

DD (authentication option): 00=none; 01=Multiple authentication.

EE (communication option): 00=none; 01=Modbus communication.

In addition, Bently Nevada also offers a range of accessories, including backup display modules, user guides, field wiring diagrams, external power supplies, installation brackets, various connecting cables, and local security barriers for hazardous areas (such as the MTL 7728/7796 series) to meet the application needs of different sites.