Introduction
The part number 990-04-70-02-00 refers to a specific configuration of a Velocity Sensor, also known as a Seismoprobe. This device is a classic and widely used sensor for measuring casing vibration on industrial machinery.
Unlike piezoelectric accelerometers, this is typically a passive, self-generating device based on the electromagnetic induction principle. It contains a permanent magnet and a coil. When the sensor's housing is vibrated, the magnet moves relative to the coil, generating an AC voltage signal that is directly proportional to the vibration velocity. This design makes it a robust, two-wire sensor that requires no external power, making it exceptionally reliable for long-term monitoring in harsh environments.
Key Parameters
The following table outlines the typical specifications for this type of velocity sensor.
| Parameter Category | Specification |
|---|---|
| Part Number | 990-04-70-02-00 |
| Type | Moving Coil Permanent Magnet Velocity Sensor |
| Measured Parameter | Vibration Velocity |
| Output Signal | AC Voltage (proportional to velocity) |
| Power Supply | None Required (Self-Generating) |
| Sensitivity | 500 mV/in/s (20 mV/mm/s) - Example Range |
| Frequency Range | 10 Hz to 1,000 Hz |
| Measurement Range | 0 - 1.0 in/s (0 - 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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