Noise / Sound Precision Monitoring Meter
The Casella CEL-633C1 is a Class 1 precision sound level meter designed for comprehensive environmental and occupational noise monitoring. It enables simultaneous measurement of key acoustic parameters, including broadband levels and frequency-based analysis using octave and 1/3-octave bands.
The instrument integrates advanced digital signal processing, onboard data logging, and optional audio recording, supporting both short-term field measurements and long-term monitoring programs. It complies with international standards, including IEC 61672 and ANSI S1.4, ensuring suitability for regulatory assessments.
The CEL-633C1 provides high-accuracy acoustic measurement and analysis in a compact, field-ready format. Its capability to capture multiple parameters simultaneously eliminates the need for range switching and supports the generation of reliable datasets for environmental noise assessment, occupational exposure evaluation, and regulatory compliance.
Key Highlights
- Class 1 accuracy (IEC 61672 / ANSI Type 1)
- Simultaneous measurement of all key acoustic parameters (Leq, Lmax, Lmin, Lpeak, etc.)
- Real-time octave and 1/3-octave band analysis
- Wide dynamic measurement range (~20–140 dB)
- Integrated audio recording and voice note functionality
- Event-triggered logging for transient noise analysis
- Large internal memory (~2 GB) for extended monitoring
- Colour display with intuitive interface
- Pre-configured environmental and occupational measurement modes
- Compatibility with Casella Insight software for analysis and reporting
Typical Applications
- Environmental noise assessments (baseline and impact studies)
- ESIA noise studies and compliance monitoring
- Occupational noise exposure assessments
- Construction and infrastructure noise monitoring
- Community noise and nuisance investigations
- Hearing protection evaluation
Industries and Use Cases
- Oil & Gas / Industrial Facilities – plant and worker noise monitoring
- Construction & Infrastructure – project noise impact assessment
- Environmental Consulting – ESIA baseline and compliance studies
- Manufacturing – occupational noise management
- Urban Development – community noise profiling
- Transport (road, rail, aviation) – environmental noise evaluation
| Parameter | Specification |
|---|---|
| Accuracy Class | Class 1 (IEC 61672, ANSI Type 1) |
| Measurement Range | ~20 – 140 dB (143 dB peak) |
| Frequency Weightings | A, C, Z (simultaneous) |
| Time Weightings | Fast, Slow, Impulse (simultaneous) |
| Frequency Analysis | Octave & 1/3 octave bands |
| Measured Parameters | Leq, Lmax, Lmin, Lpeak, dose, Ln statistics, etc. |
| Data Logging | Time history logging with event markers |
| Audio Recording | WAV recording with voice notes (up to ~60 hours low quality) |
| Memory Capacity | ~2 GB (≈1 year of data storage) |
| Display | Colour TFT screen |
| Power Supply | 3 × AA batteries (≈10–15 hours) |
| Operating Conditions | -10 to +50°C; up to 90% RH (non-condensing) |
| Connectivity | USB (PC interface with Insight software) |
| Weight | ~332 g (with batteries) |
What noise parameters can it measure?
It measures key acoustic metrics including:
- Leq, Lmax, Lmin, peak levels
- Statistical noise levels (Ln%)
Can it perform frequency analysis?
Yes. Supports:
- Octave band analysis
- 1/3 octave band analysis
Is it suitable for environmental and occupational noise monitoring?
Yes. Designed for:
- Workplace noise assessments
- Environmental/community and industrial noise surveys
Can it be used for unattended long-term monitoring?
Yes, with appropriate setup:
- Long-duration logging
- Event-triggered measurements
- Weather-protected deployment kits (where required)
Does it support audio recording?
Yes. Audio recording supports source identification during analysis (time capacity depends on configuration).