TSI Quest SE-400 Sound Level Meter

Overview

The TSI Quest SE-400 Sound Level Meter is an industrial-grade, portable acoustic measurement instrument engineered for occupational noise assessment in dynamic and regulated environments. It operates on the fundamental principle of time-weighted sound pressure level (SPL) measurement, converting analog microphone signals into digital Leq (equivalent continuous sound level) and L_AVG (time-averaged sound pressure level) values per IEC 61672-1:2013 and ANSI S1.4-2014 standards. Designed for immediate deployment without configuration, the SE-400 delivers rapid, repeatable field measurements critical for hearing conservation program (HCP) compliance, workplace exposure evaluation, and pre-audit noise surveys. Its robust housing, low-power architecture, and intuitive single-button interface support extended use in manufacturing plants, construction sites, utilities, and petrochemical facilities—especially where intrinsic safety certification is required (SE-402-R variant).

Key Features

• Intrinsically safe design (SE-402-R model certified to UL 913, Class I, Division 1, Groups A–D; ATEX/IECEx compliant)
• True RMS detection with fast/slow time weighting and impulse response modes
• Leq/L_AVG calculation over user-defined averaging periods (1 s to 24 h), enabling accurate exposure dose estimation per OSHA 1910.95 and EU Directive 2003/10/EC
• Class 1 or Class 2 interchangeable microphone options—selected at time of order—to meet application-specific accuracy requirements (e.g., regulatory reporting vs. screening-level assessment)
• Detachable preamplifier (SE-401 and SE-402-R models) for simplified calibration verification and field maintenance
• RS-232 serial interface supporting real-time data streaming and optional thermal printer output (Quest DP-200 series)
• Auto-ranging analog-to-digital conversion with overload indication and battery status monitoring

Sample Compatibility & Compliance

The SE-400 is validated for airborne sound pressure measurements across general industrial, indoor, and outdoor environments where ambient temperature remains between –10 °C and +50 °C. It accommodates standard ½-inch condenser microphones compliant with IEC 61094-4, including TSI’s calibrated Q350 and Q450 series. All variants conform to IEC 61672-1:2013 Class 2 performance specifications for frequency weighting (A, C, Z), time weighting (Fast, Slow, Impulse), and linearity (±1.0 dB tolerance). The instrument supports full traceability under ISO/IEC 17025-accredited calibration protocols and satisfies documentation requirements for GLP-aligned noise exposure records. While not FDA-regulated, its data structure and audit trail capabilities align with internal quality management systems requiring ISO 9001:2015-compliant environmental monitoring workflows.

Software & Data Management

Data acquisition and post-processing are managed through Quest Suite™ software (sold separately), a Windows-based application compatible with Windows 10/11 (64-bit). The software enables custom logging intervals (1 second to 1 hour), automatic file naming, metadata tagging (operator ID, location, task), and export to CSV, Excel, or PDF formats. It generates OSHA-compliant noise exposure reports—including TWA (Time-Weighted Average), STS (Standard Threshold Shift), and % Dose calculations—and supports batch calibration certificate import. Audit trails record all parameter changes, file exports, and user logins—supporting internal review processes aligned with ISO 9001 clause 7.5.3 and NIST SP 800-53 controls for data integrity. No cloud storage or remote access functionality is embedded; all data reside locally unless explicitly exported by the user.

Applications

• Ongoing noise exposure monitoring for OSHA 1910.95 and MSHA Part 62 compliance
• Hearing conservation program (HCP) baseline and annual audiometric correlation studies

<liPre-engineering noise surveys prior to equipment installation or facility modification

<liVerification of engineering controls (e.g., enclosures, mufflers, barriers) efficacy

<liField validation of noise mapping models generated from CAD or BIM inputs

<liEmergency response and hazardous area assessments requiring intrinsically safe instrumentation

FAQ

Is the SE-400 suitable for regulatory compliance reporting?
Yes—when equipped with a Class 1 microphone and operated within specified environmental limits, it meets IEC 61672-1:2013 Class 2 requirements applicable to most occupational noise surveys under OSHA, NIOSH, and EU directives.

Can the SE-400 measure peak sound pressure levels (L_peak)?
No—the SE-400 does not provide L_peak or L_Cpk measurement capability. It is optimized for Leq/L_AVG and percentile analysis (e.g., L₁₀, L₉₀) only.

Does the device support real-time spectral analysis?
No—frequency-domain analysis (e.g., octave or 1/3-octave band) requires external hardware (e.g., Quest 3M NoisePro Basic) or post-processing with third-party tools using exported time-series data.

What calibration standards are recommended?
Annual field calibration using a certified acoustic calibrator (e.g., TSI 901 or Quest 3M CAL200) at 114 dB @ 1 kHz is required. Full metrological calibration per ISO 17025 must be performed by an accredited laboratory every 2 years.

Is firmware upgradeable in the field?
Firmware updates are available via Quest Suite software and require a direct RS-232 connection; no over-the-air or USB-based update path is supported.