TSI Quest SE-402-IS Intrinsically Safe Sound Level Meter
| Brand | TSI |
|---|---|
| Origin | USA |
| Model | SE-402-IS |
| Instrument Type | Class 1/2 Integrating-Averaging Sound Level Meter |
| Certification | ATEX/IECEx Intrinsically Safe (IS) |
| Compliance | IEC 61672-1:2013 (Class 1), ANSI S1.4-2014 (Type 1), ANSI S1.43-2020 |
| Dynamic Range | 30–140 dBA (single-range), Peak SPL: 143 dB |
| Measurement Functions | L<sub>EQ</sub>/L<sub>AVG</sub>, L<sub>MAX</sub>, L<sub>MIN</sub>, L<sub>PK</sub>, L<sub>E</sub>, Time-Weighted (A/C/Z), Exchange Rate Options (3/4/5 dB) |
| Response Modes | Fast & Slow |
| Microphone | Optional Class 1 (QE4936) or Class 2 (QE7052) |
| Data Logging | 2 MB internal memory (~34 days at 1-min interval) |
| Power | Rechargeable Li-ion (1500 mAh), 8 h typical runtime (IS mode), USB charging |
| Environmental Rating | IP65 (housing only), Operating Temp: −10 °C to +50 °C, Drop Tested: 2 m (front/back, 2× each) |
| Physical Dimensions | 284 × 71 × 33 mm (11.2" × 2.8" × 1.3"), Weight: 410 g (incl. preamp & microphone) |
| Connectivity | Mini-USB 2.0, AC/DC analog output (non-IS models only), RS-232 (non-IS models only) |
| Accessories Supported | Quest DMS Software (sold separately), optional digital printer, 15 m remote measurement cable (non-IS models only) |
Overview
The TSI Quest SE-402-IS Intrinsically Safe Sound Level Meter is an IEC 61672-1:2013 Class 1–compliant, integrating-averaging sound level meter engineered for occupational noise assessment in hazardous locations where ignition sources must be rigorously controlled. Designed per ATEX Directive 2014/34/EU and IECEx standards for Group II (surface industries) and Category 2G (Zone 1) environments, the SE-402-IS operates under intrinsic safety principles—limiting electrical and thermal energy to levels incapable of igniting flammable gas, vapor, or dust atmospheres. Its core measurement architecture implements true RMS detection with digital signal processing optimized for real-time computation of time-integrated metrics including LEQ (equivalent continuous sound pressure level), LE (sound exposure level), and statistical descriptors (LMAX, LMIN, LPK). The instrument supports selectable frequency weightings (A, C, Z) and time weightings (Fast/Slow), with configurable exchange rates (3 dB, 4 dB, or 5 dB) aligned with OSHA, MSHA, and EU Directive 2003/10/EC requirements for hearing conservation program compliance.
Key Features
- Intrinsically safe design certified to ATEX 2G IIC T4 Gb and IECEx EX ib IIC T4 Gb for use in Zone 1 explosive atmospheres
- IEC 61672-1:2013 Class 1 accuracy validated across full dynamic range (30–140 dBA), with peak capability up to 143 dB
- Single-range architecture eliminates manual range switching—enabling immediate start-up without configuration
- Integrated 2 MB non-volatile memory supports autonomous logging at user-defined intervals (1 sec to 1 hr); retains >34 days of data at 1-minute resolution
- Robust housing rated IP65 (dust-tight and water-jet resistant), drop-tested to 2 m on front and back surfaces
- Rechargeable lithium-ion battery (1500 mAh) delivers ≥8 hours of continuous operation in IS mode; charged via standard mini-USB port
- Intuitive monochrome LCD with real-time status indicators: battery level, overload (OL), under-range (UR), lock state, and elapsed run time
Sample Compatibility & Compliance
The SE-402-IS is compatible with TSI’s calibrated Class 1 (QE4936) and Class 2 (QE7052) free-field microphones, both featuring ½″ electret condenser elements and integrated preamplifiers. While the microphone capsule itself is not intrinsically safe, the system maintains full IS integrity through galvanic isolation and current-limiting circuitry in the meter body. The device complies with ISO 9612:2009 for occupational noise measurement methodology and meets the technical requirements of ANSI S1.4-2014 (Type 1) and ANSI S1.43-2020 for integrating-averaging instruments. It supports GLP-aligned audit trails when paired with Quest DMS software, and its firmware architecture enables traceable calibration verification per ISO/IEC 17025–accredited laboratory procedures. Note: AC/DC analog output and RS-232 interfaces are disabled in IS configuration to preserve certification integrity.
Software & Data Management
Data acquisition and reporting are managed via TSI Quest DMS (Dose Management Software), a Windows-based application sold separately and validated for use in regulated environments. DMS supports automated import of logged files via USB, batch export to CSV or PDF, customizable report templates compliant with OSHA 29 CFR 1910.95 and EU Noise Directive Annex III, and generation of dose–response curves for hearing conservation analysis. The software enforces secure user authentication, provides electronic signature capability, and maintains immutable audit logs meeting FDA 21 CFR Part 11 requirements for electronic records and signatures. All calibration events—including date, technician ID, reference standard used, and deviation values—are embedded in exported datasets for regulatory submission.
Applications
The SE-402-IS is deployed in upstream oil & gas facilities (refineries, offshore platforms), chemical manufacturing plants, pharmaceutical cleanrooms with solvent handling, grain elevators, and mining operations where combustible dust or hydrocarbon vapors may be present. It serves as a primary tool for baseline noise surveys, task-based exposure assessments, engineering control validation, and periodic monitoring required under hearing conservation programs. Its Class 1 accuracy and LEQ-centric measurement paradigm ensure reliable input for noise mapping, HPD selection modeling, and regulatory documentation supporting MSHA Part 62, HSE Control of Noise at Work Regulations 2005, and DGUV Regulation 36.
FAQ
Is the SE-402-IS suitable for outdoor environmental noise monitoring?
No—it is designed exclusively for occupational health and safety applications in industrial settings. For environmental noise (e.g., community noise, airport monitoring), IEC 61672-1 Class 1 meters with weatherproof enclosures and windscreen compatibility are recommended.
Can the internal memory be expanded or replaced?
No—the 2 MB flash memory is fixed and soldered; data must be offloaded regularly via USB to prevent overwrite.
Does the SE-402-IS support real-time spectral analysis or octave band filtering?
No—it is a broadband integrating-averaging meter without frequency-selective analysis capabilities. For spectral characterization, consider TSI’s Q450 or Q550 series analyzers.
What is the recalibration interval recommendation?
TSI recommends annual calibration against an accredited acoustic standard; field verification using a Class 1 calibrator (e.g., QC-100) should be performed before and after each measurement session.
Is the microphone included with the SE-402-IS unit?
No—microphones (QE4936 Class 1 or QE7052 Class 2) and preamplifiers are ordered separately to match application-specific accuracy and environmental requirements.
