Introduction
The model 990-04-XX-01 is a Velomitor® Series Piezoelectric AC Accelerometer from PCB Piezotronics. This model is part of a family of high-frequency response, industrial-grade sensors designed for measuring dynamic vibration. The "XX" in the model number is a placeholder that specifies the sensitivity value (e.g., -10 for 10 mV/g, -50 for 50 mV/g, -100 for 100 mV/g). This accelerometer outputs a raw AC voltage signal proportional to acceleration, making it ideal for condition monitoring, vibration testing, and machinery analysis where detailed frequency data is required. Its rugged, stainless steel construction ensures reliability in harsh industrial environments.
Parameters / Specifications
The following table outlines the key technical parameters for a typical 990-04-XX-01 series accelerometer.
| Parameter | Specification / Range |
|---|---|
| Model Number | 990-04-XX-01 (e.g., 990-04-10-01 for 10 mV/g) |
| Description | AC-Coupled, Industrial IEPE Accelerometer |
| Physical Dimensions | Approx. 24 mm (0.94 in) height x 19 mm (0.75 in) diameter (hex) |
| Weight | Approx. 45 grams (1.6 oz) |
| Measurement | Dynamic Acceleration & Vibration |
| Output Signal | AC Voltage (IEPE/ICP® compatible) |
| Sensitivity (XX) | Variable: e.g., 10 mV/g, 50 mV/g, 100 mV/g (±10%) |
| Frequency Range | 1.0 to 10,000 Hz (±3 dB) |
| Dynamic Range | ±500 g Peak |
| Power Supply | 18 to 30 VDC, 2 to 20 mA constant current IEPE/ICP® |
| Electrical Connection | 10-32 coaxial connector, top exit (integral cable versions also available) |
| Housing Material | Stainless Steel |
| Operating Temperature | -54°C to +121°C (-65°F to +250°F) |
*Note: The "XX" sensitivity code is critical for defining the sensor's performance. Always confirm the full model number (e.g., 990-04-50-01) for exact specifications. Dimensions and weight are representative and may vary slightly.*
Application Scenarios
The 990-04-XX-01 series accelerometer is versatile and used in various scenarios requiring detailed vibration analysis:
Predictive Maintenance (PdM) Programs:
Permanently mounted on critical machinery such as pumps, gearboxes, and compressors to collect high-frequency vibration data for trend analysis and early fault detection of bearing wear, gear meshing issues, and cavitation.
Vibration Analysis and Diagnostics:
Used by reliability engineers and technicians for periodic data collection with portable analyzers. The AC output allows for in-depth frequency spectrum and waveform analysis to diagnose the root cause of machine vibrations.
Test and Measurement Applications:
Ideal for product development, qualification testing, and laboratory measurements on structures, components, and assemblies to characterize their dynamic response.
Condition Monitoring of Motors and Fans:
Excellent for monitoring mid-to-high-speed motors and fans, providing the necessary frequency bandwidth to detect issues like imbalance, misalignment, and electrical faults.
Industrial OEM Equipment:
Embedded into original equipment by manufacturers to provide built-in vibration monitoring capabilities for their machines, enhancing their value and reliability.
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