Introduction
The part number 990-04-XX-01 refers to a Velocity Sensor / Seismoprobe, where the "XX" is a variable placeholder that defines a key specification, most commonly the sensitivity (e.g., 500 mV/in/s).
This device is a passive, self-generating sensor used for measuring casing vibration on industrial machinery. It operates on the electromagnetic induction principle: a permanent magnet and a coil move relative to each other when the housing is vibrated, generating an AC voltage signal proportional to the vibration velocity. This simple, robust, and power-free design makes it exceptionally reliable for long-term monitoring in harsh industrial environments.
Key Parameters
The following table outlines the typical specifications for this series of velocity sensors. The "XX" suffix is crucial for determining the exact sensitivity.
| Parameter Category | Specification |
|---|---|
| Part Number | 990-04-XX-01 (e.g., 990-04-50-01 for 500 mV/in/s) |
| Type | Moving Coil Permanent Magnet Velocity Sensor |
| Measured Parameter | Vibration Velocity |
| Output Signal | AC Voltage (proportional to velocity) |
| Sensitivity (XX) | Typically defined by the "XX" suffix (e.g., 50 for 500 mV/in/s) |
| Power Supply | None Required (Self-Generating) |
| Frequency Range | 10 Hz to 1,000 Hz (approx. 600 to 60,000 CPM) |
| Amplitude Range | Up to 1.0 in/s (25.4 mm/s) Peak - Example |
| Housing Material | Stainless Steel (e.g., 304 or 316 SS) |
| Electrical Connection | 2-pin, military-style connector or integral cable |
| Process Connection | 1/4-28 UNF or M10 x 1.5 mounting stud |
| Internal Magnet Material | Alnico or Rare Earth Magnet |
| Coil Material | Copper Windings |
| Operating Temperature | -50 °C to +120 °C (-58 °F to +248 °F) |
| Dimensions (Body) | Approx. 70 mm (2.75 in) height x 30 mm (1.18 in) diameter |
| Weight | Approx. 400 g (0.88 lbs) |
Application Scenarios
This velocity transducer is a workhorse for general-purpose machinery monitoring, prized for its simplicity and durability. Its key application scenarios include:
General-Purpose Casing Vibration Monitoring:
Pumps, Fans, Motors, and Blowers: Permanently installed on bearing housings to measure overall casing vibration velocity. Its self-powered nature and robust construction make it ideal for these common industrial assets.
HVAC and Building Management Systems:
Large Chillers, Cooling Towers, and Air Handling Units: Used extensively to monitor the health of large motors and fans in commercial HVAC systems, ensuring they operate within safe vibration limits.
Heavy-Duty and Remote Applications:
Mining, Quarry, and Water Treatment Equipment: Its ability to operate without external power and withstand harsh environments makes it suitable for heavy machinery and applications where power availability at the sensor location is a concern.
Basic Condition-Based Maintenance Programs:
Portable Data Collection Routes: Used by maintenance technicians with handheld data collectors for periodic route-based vibration measurements. The simple AC voltage output is easily read by most portable analyzers.
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