ANV Measurement Systems Enhanced Long-Term Noise Kits based on Rion NL-31 (Class 1) are very widely used for baseline noise surveys. The weather-protected microphone is mounted on a stainless steel pole attached to the side of the weather-resistant case which contains the sound level meter and gel-cell batteries. The system provides a stable alternative to mounting the microphone on a tripod and, unless you are using mains or solar power, there are no exposed leads. The system was re-engineered in 2009 to improve cable handling (the microphone extension cable can now be fed through the pole to the meter without removing the pole from the side of the case) and watertightness.

These outdoor kits are site-proven. They are widely used for windfarm baseline surveys and have successfully survived some of the harshest weather conditions to be found in the UK.

• Rion NL-31 (Class 1)/21 (Class 2) Integrating Logging Sound Level Meter
• Can be used with Rion NL-32 (Class 1)/NL-22 (Class 2) and NX-22J if audio recording is required
• Remote control and download options (RCDS) also available
• Rion WS-03 Outdoor Microphone Protection
• Weather Resistant and Lockable Case for Sound Level Meter
• Gel-Cell Batteries & Charger Providing 10 days’ Continuous Use in Standard format although additional batteries can optionally be added for longer battery life
• Integral pole holds microphone 1.4 metres above the prevailing ground height
• Mains and solar powered options available
• Measures Leq, Lmax, LAmin SEL, up to 5 statistical noise indices (LN) and instantaneous sound pressure level
• Stores up to 99,999 sets of data (LAeq, LAmax, 5LNs etc)
• Stores up to 200 hours of 1 second LAeq or 100ms samples
• The word ‘Store’ flashes on the screen once a second when the meter is logging data
• Data stored on to compact flash cards as csv text files which can be read directly by spreadsheet programmes (no requirement for proprietary download programs, download leads or dongles)

Rion NL-22 NL-32 Class 1 Class 2 Noise Analyser The Rion NL-32 is a straightforward integrating logging sound level meter but it gives the user access to useful options. The NL-32 can be deployed with triggerable sound recording for long-term su... view product details
Rion WS-03 Outdoor Protection for Rion Microphones The Rion WS-03 Outdoor Microphone Protection System is practical, simple and effective, providing all the protection that a Rion microphone and pre-amplifier need against the elements. The WS-03 is t... view product details
Standard Long-Term Noise Monitors The ANV Measurement Systems Standard Long-Term Noise Kits based on Rion NL-31 (Class 1) are very widely used for baseline noise surveys and construction noise monitoring. This simple and economic s... view product details
Long-Term Noise Monitors with Audio Recording The next best thing to a long-term attended survey is a long-term unattended noise survey with audio recording. This enables you to measure the noise levels over an extended period of time cost-effec... view product details
Rion NA-28 Based Systems If you need to log octave and/or third octave bands (LAeq, LAmax, Lmin, SEL and LN%) then you need an NA-28 Based Long-Term Noise Monitoring System. The NA-28 , Rion's top of the range meter, offe... view product details
Rion WS-15 Outdoor Protection for Rion Microphones The Rion WS-15 Outdoor Microphone Protection System is practical, simple and effective, providing all the protection that the Rion NL-52’s microphone and pre-amplifier need against the elemen... view product details
NL-52 Based Long-Term Noise Monitors NL-52 based long-term monitors offer cost-effective and upgradeable Class 1 noise data logging. Available as Standard or Enhanced long-term monitor format you can expect at least 10 days data l... view product details