Model NMrt -Sound-Level Meter

Said radio-modem allows transmitting the data to a Central Ambient Noise Monitoring Station (NMC - Noise Management Center), where dynamic noise maps are prepared and presented, with reliable and precise data updated in real time, fed by the continuous measurements from all the sites where a remote acoustic terminal is installed.

Thanks to their extremely low energy consumption, the NoiseMapper-RT (NMrt) remote terminals are capable of continuously measuring and processing ambient noise, transmitting the data in real time via GPRS, powered by their own internal battery and a small solar charging panel. Optionally, it is also possible to transmit the data using Wi-Fi networks or point-to-point, or point-to-multipoint, radio links.

The combination of the NMrt remote stations network and the Central Ambient Noise Monitoring Station make up the NoiseMonitoring System, described separately.

Category:

• Class 1, for the sound-level meter Model NMrt-1

• Class 2, for the sound-level meter Model NMrt-2

Type of Measurements:

• Sound level with exponential time weighting (conventional sound-level meter).

• Time-averaged sound level (integrating-averaging sound-level meter).

• Sound exposure (integrating sound-level meter).

Frequency Weighting:

• A, C and Z all for Class 1.

Exponential time weighting:

• F and Sfor conventional sound-level meter.

Integration times:

• 10s; 1,5,10 and 30 min; 1, 8 and 24 hours

Average parameters:

• Sound pressure level: LP

• Peak sound pressure level: Lpeak

• Exponentially weighted sound level: LAF, LAS, LCF, LCS, LZF y LZS

• Maximum sound level: Lmax

• Average sound level: LAeqT, LZeqTS y LZeqT

• Sound exposure level: LAE, LCE y LZE

Other technical characteristics of the NMrt sound-level meter:

• Assembly: Compact in outdoor box made of highly resistant polypropylene (IP-67 protection and 30x23x13cm dimensions).
• Internal memory: 64 Mbytes, upgradeable to 128 Mbytes.
• Positioning: Using an integrated, optional GPS receiver. (allows synchronising all the terminals of a measurement network, as well as referring the transmitted data to the position of each measurement point).
• Auxiliary channels: 8 analog input channels for connecting eight optional meteorological sensors.
• Communication ports: 4 configurable serial RS232/422/485/Ethernet ports.
• Radio-Modem: GSM/GPRS or CDMA, for data transmission.
• Power: Internal 12 VDC battery, rechargeable via solar panel or connection to the 220VAC grid.
• Consumption: 20 mA@12V for the overall set (microphone, processor and data-storage and transmission unit).

• Noise measurement and monitoring in urban areas.
• Noise measurement and monitoring in roads and railroads.
• Noise measurement and monitoring in airports and heliports.
• Ambient noise measurement networks with real time data transmission via cellular GSM/GPRS phone or RTC line.
• Industrial noise measurement and monitoring.
• Noise maps.
• Noise dose.
• Exposure to noise in specific work areas.