TSI Quest SoundPro SE/DL Series Class 1 & Class 2 Sound Level Meter

Overview

The TSI Quest SoundPro SE/DL Series Sound Level Meters are precision-engineered instruments designed for compliant, repeatable, and traceable acoustic measurements in occupational health, environmental monitoring, regulatory enforcement, and industrial acoustics applications. Built upon the internationally recognized IEC 61672-1:2013 and ANSI S1.4 standards, these meters deliver Class 1 or Class 2 performance—enabling users to select the appropriate metrological grade based on application requirements and regulatory mandates. The core measurement principle relies on electroacoustic transduction via a calibrated condenser microphone coupled with high-fidelity analog-to-digital conversion and real-time digital signal processing. Unlike basic sound pressure level (SPL) indicators, the SoundPro platform integrates dual virtual meter architecture, allowing simultaneous acquisition of two independent measurement channels—including concurrent A- and C-weighted time histories—within a single physical unit. This architecture supports advanced comparative analysis, such as peak-vs.-Leq evaluation or weighted/unweighted spectral contrast, without requiring hardware duplication.

Key Features

• Dual virtual sound level meter functionality: Run two independent measurement configurations (e.g., A-weighted Leq + C-weighted Peak) simultaneously on one device
• Full compliance with IEC 61672-1:2013 and ANSI S1.4-2014 for Class 1 and Class 2 accuracy specifications
• Real-time octave and fractional-octave spectrum analysis (optional firmware upgrade for 1/1- and 1/3-octave bands)
• Configurable time weighting: Fast (125 ms), Slow (1 s), and Impulse (35 ms rise, 1.5 s decay) per IEC 61672
• Frequency weighting selection: A (for hearing damage risk assessment), C (for peak impact noise), and Z (linear, 10 Hz–20 kHz flat response)
• Programmable trigger logic: Start/stop logging based on user-defined SPL thresholds (10–140 dB range)
• Adjustable exchange rate: Select 3 dB (OSHA), 4 dB (EU Directive 2003/10/EC), 5 dB, or 6 dB for noise dose calculation
• Backlit high-contrast LCD display with illuminated membrane keypad for low-light field operation
• Expandable data storage via standard SD memory card (FAT32 formatted, up to 32 GB supported)
• Dual communication interfaces: USB 2.0 (mass storage & CDC serial emulation) and legacy RS-232 (DB9)

Sample Compatibility & Compliance

The SoundPro SE/DL series is validated for use with TSI-certified ½-inch free-field condenser microphones (e.g., Model 131A), ensuring traceable calibration against NIST-traceable reference standards. All units ship with factory calibration certificates compliant with ISO/IEC 17025 requirements when performed by accredited TSI Calibration Laboratories. The instrument meets the technical criteria for workplace noise assessment under OSHA 29 CFR 1910.95, EU Physical Agents (Noise) Directive 2003/10/EC, and ISO 9612:2009 for engineering-level noise surveys. For regulatory enforcement scenarios—including municipal noise ordinance verification—the DL-series models support noise dose computation with full audit trail logging, enabling GLP-aligned reporting. Optional 21 CFR Part 11-compliant software modules (via QuestSuite Professional v6.0+) provide electronic signature, user access control, and immutable audit logs for GMP or FDA-regulated environments.

Software & Data Management

Data acquisition, visualization, and reporting are managed through QuestSuite Professional—a Windows-based desktop application qualified for laboratory and industrial QA/QC workflows. The software enables post-processing of time-history waveforms, spectral plots, statistical distributions (L₁₀, L₅₀, L₉₀, L_max, L_min), and integrated noise dose reports (DL series only). Raw binary files (.QSD) are stored on SD cards and imported into QuestSuite with metadata preservation—including GPS coordinates (when paired with optional Bluetooth GNSS module), operator ID, project tags, and calibration history. Export formats include CSV, PDF, and XML for integration with enterprise LIMS or EHS platforms. Firmware updates and configuration templates are deployed via USB mass-storage mode, eliminating dependency on proprietary drivers.

Applications

• Occupational noise exposure assessment per ISO 9612 and ANSI S1.25 for hearing conservation programs
• Environmental noise mapping around transportation corridors, construction sites, and industrial perimeters
• Regulatory compliance verification for local noise ordinances and EPA guidelines (e.g., 40 CFR Part 205)
• Product noise certification testing for appliances, HVAC systems, and power tools (ISO 3744, ISO 7779)
• Architectural acoustics evaluation—including façade transmission loss and interior reverberation analysis
• Mobile equipment noise characterization (e.g., drones, EVs, delivery robots) using time-synchronized trigger logging
• Academic research in psychoacoustics and community annoyance modeling (e.g., LDEN, L_den)

FAQ

What is the difference between SoundPro SE and DL models?
The DL series includes integrated noise dose calculation, time-history export with sub-second resolution, and extended battery life for multi-shift logging—features not available in the SE series.
Is calibration traceable to NIST?
Yes—each instrument ships with a certificate of calibration traceable to NIST via TSI’s A2LA-accredited calibration laboratory (ISO/IEC 17025:2017 accredited).

Can the SoundPro perform 1/3-octave band analysis in real time?
Yes—with optional firmware activation and compatible microphone preamplifier, real-time 1/3-octave analysis is supported up to 20 kHz.

Does it support remote monitoring or network connectivity?
No native Ethernet or Wi-Fi; however, USB-connected operation allows integration with PC-based SCADA or data acquisition systems via virtual COM port.

How often should field calibration be performed?
Per IEC 61672-3, acoustic calibrator checks (e.g., TSI 903 Calibrator) are required before and after each measurement session; full recalibration is recommended annually or after mechanical shock.