Outdoor Preamplifier for Series 821 Sound Level Meters

Key Benefits of Preamplifier Model PRM2105

• Reliable, defendable measurements
  • Built-in heater prevents condensation-related errors
  • Automatic calibration checks verify system performance
• Low maintenance operation
  • Eliminates the need for desiccants
  • Reduces routine service requirements
• Advanced features at an accessible price point
  • Brings high-end monitoring capabilities to the SoundExpert 821ENV platform
• Flexible deployment
  • Supports both handheld and remote outdoor configurations
  • Compatible with long cable runs up to 300 ft (100 m)

Designed for Unattended Monitoring

With low power consumption and rugged design, the PRM2105 is ideal for unattended outdoor noise monitoring applications. It integrates seamlessly into Larson Davis monitoring systems, including:

• SoundExpert Noise Monitoring System Model NMS048 for short-term environmental noise monitoring
• Environmental Monitoring System Model EMS011 for long-term, continuous monitoring deployments

Model PRM2105 is fully compatible with Environmental Protection Shroud Model EPS2116.  For outdoor measurements, PRM2105 should always be used with EPS2116 to provide complete protection for the microphone and preamplifier.

Built for Confidence in Your Data

The PRM2105 introduces advanced system validation features typically found only in high-end monitoring systems. When used with the SoundExpert 821ENV, the system can perform automatic daily calibration checks at a user-defined time. A five-frequency tone is injected into the microphone and the response is recorded, verifying the integrity of the entire measurement chain. This continuous system health check:

• Identifies potential issues before data is compromised
• Reduces the risk of costly data loss
• Provides documented proof of measurement accuracy for regulatory or legal requirements

The PRM2105 outdoor preamplifier, combined with the SoundExpert 821ENV, delivers a powerful, flexible, and cost-effective solution for environmental noise professionals. With built-in reliability features and simplified maintenance, it ensures your measurements remain accurate, defensible, and ready when you need them.