Introduction
The EPRO 330850-91-05 is a specific model of a 4-20 mA Two-Wire Vibration Transmitter from EPRO (Baker Hughes). This device is designed for continuous monitoring of casing vibration on a wide range of industrial machinery, such as pumps, motors, fans, and compressors.
This transmitter integrates a robust seismic sensor with signal conditioning electronics into a single, compact housing. It is a loop-powered, two-wire device, meaning it uses the same two wires for both receiving its operating power (typically +24 V DC) and transmitting the standardized 4-20 mA output signal. This output is directly proportional to the overall vibration velocity (in mm/s or in/s) of the machine casing, making it exceptionally easy to connect to a Plant's Distributed Control System (DCS), Programmable Logic Controller (PLC), or any data acquisition system. The "-91-05" suffix defines its specific measuring range and mechanical configuration.
Parameters / Specifications
The key technical specifications for the EPRO 330850-91-05 are summarized in the table below.
| Parameter | Specification |
|---|---|
| Part Number | 330850-91-05 |
| Product Line / Type | EPRO (Baker Hughes) 4-20 mA Vibration Transmitter |
| Measured Parameter | Casing Vibration Velocity |
| Output Signal | 4-20 mA, Two-Wire, Loop-Powered |
| Measuring Range | 0...20 mm/s True RMS (This is a key interpretation of the -91 suffix). |
| Frequency Range | 10 Hz to 1,000 Hz (600 to 60,000 CPM) |
| Power Supply | 12 to 30 V DC (Loop Powered) |
| Electrical Connection | 1/2" NPT Conduit connection (a common standard). |
| Mounting | Single 1/4-28 UNF or M6 threaded stud on the base. |
| Housing Material | Stainless Steel |
| Sensing Orientation | Any (omnidirectional) |
| Linearity | ±1% of full scale |
| Dimensions (Approx.) | Diameter: 2.5 in (64 mm), Height: 3.5 in (89 mm) |
| Weight (Approx.) | 1.5 lbs (0.68 kg) |
| Operating Temperature | -40°C to +85°C (-40°F to +185°F) |
| Degree of Protection | IP67 |
Note: Suffix interpretations are based on common EPRO configuration codes. For absolute certainty, consulting the official EPRO datasheet is recommended.
Application Scenarios
This vibration transmitter is designed for widespread use on general-purpose and critical machinery where a simple, robust, and continuous vibration signal is needed for predictive maintenance and operational awareness.
Typical application scenarios include:
Critical Pump and Motor Monitoring:
Permanently installed on cooling water pumps, charge pumps, and large electric motors in industrial plants. The 4-20 mA signal provides early warning of bearing wear, imbalance, or misalignment, allowing maintenance to be planned before failure.
Fan and Blower Monitoring:
Mounted on the bearing housings of induced draft (ID) fans, forced draft (FD) fans, and industrial blowers to monitor for vibration caused by fouling, imbalance, or structural issues. The signal can be directly integrated into the plant's control logic for alarm generation.
Compressor Casing Vibration:
Used on non-critical or smaller compressors to track overall vibration levels. The two-wire design simplifies installation and reduces wiring costs compared to systems requiring separate power and signal cables.
OEM Machinery Integration:
Built into original equipment by machinery manufacturers to provide a built-in vibration monitoring capability, making it easier for end-users to integrate the machine's health into their plant control system.
Industries of Use:
Water and Wastewater Treatment
Chemical and Petrochemical Processing
Power Generation (for auxiliary equipment)
HVAC
Manufacturing and Heavy Industry
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