330780-91-05 Seismic Transmitter
Description:
The part number 330780-91-05 refers to a 4-20 mA Vibration Transmitter from the Bently Nevada product line. This device is a robust, loop-powered transducer designed for continuous monitoring of casing or structural vibration (velocity) on a wide range of industrial rotating machinery.
It is an integrated, two-wire device that combines a velocity sensor (seismometer) and a signal conditioner into a single, ruggedized package. The transmitter measures the vibration velocity of the surface on which it is mounted and converts it directly into a standardized 4-20 mA analog signal, which is proportional to the vibration level. This signal can be easily sent to a PLC, DCS, indicator, or a monitoring system's 4-20 mA input card for machinery protection and monitoring.
Parameters & Specifications
The following table details the key parameters for this specific configuration based on common Bently Nevada product numbering schemes.
| Parameter | Specification / Interpretation |
|---|---|
| Part Number | 330780-91-05 |
| Device Type | 4-20 mA Vibration Transmitter (Velocity) |
| Measured Parameter | Vibration Velocity |
| Sensitivity / Range | -91- = 0 to 25.4 mm/s True Peak (0 to 1.0 in/s). This is a standard, general-purpose range for industrial vibration monitoring. |
| Frequency Range | Typically 4.5 Hz to 1000 Hz (Standard for velocity transmitters). |
| Electrical Connection | -05 = Likely a 1/2" NPT conduit entry for connection. |
| Output Signal | Two-wire, 4-20 mA analog output. |
| Power Supply | Typically 12 to 30 VDC loop power (standard for two-wire 4-20 mA devices). |
| Scale Factor | (20 mA - 4 mA) / Range = 16 mA / 25.4 mm/s ≈ 0.63 mA/(mm/s) |
| Operating Temperature | Typically -40°C to +85°C (-40°F to +185°F) |
| Housing Material | Typically stainless steel. |
| Mounting | Typically a single 1/4"-28 UNF or M10 x 1.5 threaded stud on the base. |
| Typical Dimensions | Approx. 80 mm (H) x 65 mm (Diameter) - can vary by model. |
| Typical Weight | Approx. 0.9 kg (2.0 lbs) |
Important Note: *This part number follows a common Bently Nevada format for their 4-20 mA transmitters. The interpretations above are highly probable but must be verified with the official datasheet from* Baker Hughes *for this exact part number. The 25.4 mm/s (1 in/s) range is the most common for general-purpose monitoring.*
Application Scenarios
This vibration transmitter is designed for continuous, reliable monitoring of overall vibration on a wide range of industrial equipment. Its simple 4-20 mA output makes it ideal for integration into basic control and monitoring systems.
Casing Vibration Monitoring on Pumps, Fans, and Motors: The most common application. It provides a direct measurement of the machine's overall mechanical health, protecting against failures caused by:
Imbalance
Misalignment
Bearing Wear (in later stages)
Structural Looseness
Non-Critical Machine Protection: Used as a cost-effective protection solution for less critical assets where a full machinery monitoring system is not justified. The 4-20 mA signal can be wired directly to a PLC to trigger an alarm or shutdown if vibration levels become excessive.
Continuous Monitoring of Auxiliary Equipment: Ideal for motors, blowers, compressors, and other equipment that is important for the process but may not require the advanced diagnostics of a proximity probe system.
Plant-Wide Vibration Monitoring Programs: Its rugged design and simple installation make it suitable for deploying across a facility to monitor hundreds of assets, providing a basic level of protection and enabling condition-based maintenance.
API 670 Compliance Support: For machinery where the API 670 standard mandates casing vibration monitoring, these transmitters provide a compliant solution.
Typical Machinery:
Centrifugal & Axial Pumps
Electric Motors (medium to large horsepower)
Fans and Blowers
Gearboxes
Compressors (non-critical)
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