NSRTW_mk4_MQTT
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NSRTW_mk4_MQTT

565.00 $

SKU NSRTW-mk4-mqtt Category Tag
New microphone with
extended dynamic range

The Wireless Sound Level Meter Data Logger NSRTW_mk4 MQTT is similar in form, function and performance to the NSRTW_mk4. It has been designed with an open wireless protocol based on MQTT, for developers and OEMs who need to integrate it to their own platform while using wireless connectivity.

The instrument publishes recorded data (Lpeak, Lmin, Lmax, LEQ) and vital signs to any standard MQTT broker. The communication protocol is fully documented.

FCC CE

DESIGNED FOR DEVELOPERS & OEMs

This MQTT version is ideal if you need to:

  • • Integrate noise data into your own cloud platform
  • • Connect to a standard MQTT broker (AWS IoT, Azure, Mosquitto…)
  • • Build custom dashboards and alerting pipelines

→ An expert can help you plan your integration (it's free)

See the NSRTW_mk4 for specific information about the instrument itself.
Talk to an expert

✔️ Get help choosing the right model for your integration

✔️ Discuss MQTT broker setup and protocol specifics

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Key Features

Class 1 Precision

Class 1 sound level meter with digital MEMS microphone for accurate measurements

Open MQTT Protocol

Publishes data to any standard MQTT broker, fully documented protocol for custom integration

WiFi + USB Connectivity

Wireless data publishing via WiFi and local configuration/download via USB

Outdoor Ready

Dust-Protected weatherproof enclosure for long-term outdoor installations

Product Description

The Wireless Sound Level Meter Data Logger NSRTW_mk4 MQTT is similar in form, function and performance to the NSRTW_mk4. It has been designed with an open wireless protocol based on MQTT, for developers and OEMs who need to integrate it to their own platform while using wireless connectivity.

It includes a digital MEMS microphone, an accurate date/time clock, a non-volatile 128 Mb recording memory and wireless connectivity. Running on battery, it can record sound pressure levels and publish them through WiFi™ to any standard MQTT broker for a week. Connected to an external USB charger it can record and report for months.

Its very small size allows it to be attached to or embedded within the monitored equipment. Every NSRTW_mk4 MQTT purchased is provided with an Individual Manufacturer's Certificate of Calibration from Convergence Instruments. This all-digital design includes the A, C and Z weighting curves. It is enclosed in a completely weatherproof casing which is designed for indoors and outdoors applications.

Key Differences from NSRTW_mk4

  • Open MQTT protocol — publishes data to any standard MQTT broker instead of Convergence's proprietary cloud
  • No email alarm functions — alarm logic is handled by your own platform
  • No Cloud CIDataSolutions™ compatibility — designed to work with your own cloud infrastructure
  • Fully documented protocol — binary message format documented for integration (download protocol documentation)

Measurement Capabilities

  • A, C and Z weighting curves
  • Integrating Sound-Level Meter — records Lpeak, Lmax, Lmin and LEQ levels
  • Log interval adjustable from 125 ms (8 points per second) up to hours
  • 2048-point real-time power spectrum
  • Recording of acoustic signal (USB audio interface included)

MQTT Protocol Overview

The NSRTW_mk4 MQTT communicates with any standard MQTT broker using a documented binary protocol. The instrument publishes recorded data and vital signs automatically at each connection interval.

Connection Behavior

The instrument connects to the broker at configurable intervals via WiFi. It uses a clean session, QoS 1, and tracks which data has already been published to avoid gaps.

Published Data

At each connection, the instrument publishes: vital signs (battery, temperature, UTC, clock error), and all recorded values not yet acknowledged (Lpeak, Lmin, Lmax, LEQ). Messages contain up to 512 values each (1024 bytes).

Remote Configuration

The instrument can receive new settings via the broker's subscribe topic. Configuration changes are applied at the next connection. Settings include log interval, weighting curve, recording parameters and more.

Two Modes of Operation

Standard Mode: topic strings are defined by the instrument for each message type. Forced Mode: custom Pub/Sub topics defined by the user, for brokers that impose topic strings (e.g. AWS IoT). Both modes can be mixed.

Compatible Brokers

Works with any MQTT broker that supports QoS 1, including:

  • Eclipse Mosquitto (self-hosted)
  • AWS IoT Core
  • Azure IoT Hub
  • HiveMQ
  • Any standard MQTT 3.1.1 broker

→ Download the full MQTT Protocol Documentation (PDF)

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Which Model to Choose?

Feature NSRT_mk4 NSRTW_mk4 NSRTW_mk4 MQTT ★
Price Base price (no WiFi) Higher (adds WiFi) Similar to NSRTW_mk4
Battery Life 5 to 7 days on battery, months while externally powered Similar autonomy on battery, WiFi reduces battery time Similar autonomy on battery, WiFi reduces battery time
WiFi Built-in No Yes Yes
Communication Protocol USB only Proprietary (CI Cloud) Open MQTT
Cloud Compatibility No CIDataSolutions™ Any MQTT broker (AWS IoT, Azure, Mosquitto…)
Email Alarms No Yes No (handled by your platform)
Best For Short-term logging with local download WiFi projects with CI Cloud or local IT OEMs & developers integrating into custom platforms

Clients Use the NSRTW_mk4 MQTT For:

🔌

CUSTOM IoT PLATFORM INTEGRATION

"We publish noise data to our own AWS IoT pipeline for real-time dashboards"

→ Industries: IoT Platform Providers, Smart City

🏭

INDUSTRIAL MONITORING NETWORKS

"Dozens of units feeding our SCADA system for plant-wide noise compliance"

→ Industries: Manufacturing, OEMs, Process Control

🏢

SMART BUILDING & ENVIRONMENTAL

"Integrated into our building management system for tenant comfort monitoring"

→ Industries: PropTech, Consulting Firms, Research

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Software Description Importance Download
Instrument Manager Universal Installer Instrument Management Software Essential Install BEFORE connecting the instrument
Instrument Listener Fast Connect Installer Must run on the server to receive and process incoming NSRT-W connections. Now includes the AutoCalc feature, which automatically calculates various metrics in batch and exports the data to a spreadsheet format Essential for WiFi connectivity on the server-side
Instrument RealTime Listener Must run on the server to allow any number of instruments to connect and present real-time data on the server’s display. Optional
Noise Sentry RT Community Noise Metrics Installer An application to calculate various noise metrics, such as CNEL, LDEN… and many others Optional
Instrument Disk Recorder An application to stream to disk the acoustic signal Optional
NSRT AutoCalc An application to calculate and automatically export standard metrics to Excel (LEQ, Lmin, Lmax, percentiles…etc.) Optional
NSRT Directivity An application to show the frequency response and directivity pattern Optional
Python Example Code Python library for parsing NSRTW_mk4 MQTT protocol messages (can also be used as a guide for VSEW_mk4_MQTT) Optional
NSRT_mk4 NSRT_mk4_Dev NSRTW_mk4 (Wireless) NSRTW_mk4 MQTT (Wireless)
Precision Class Type I Type I Type I Type I
Connectivity USB-only USB-only USB & WiFi USB & WiFi
Email Alarm Functions No No Yes No
Cloud Solution Compatibility No No Yes No (designed to work with a standard MQTT broker)
Weighting Curves A, C, Z A, C, Z A, C, Z A, C, Z
Values measured Lpeak, Lmin, Lmax, LEQ L instantaneous, LEQ Lpeak, Lmin, Lmax, LEQ Lpeak, Lmin, Lmax, LEQ
Recording of Acoustic Signal Included Optional (USB-Audio option) Included Included
Attachment System Wall or Tripod Mountable Wall or Tripod Mountable Wall or Tripod Mountable Wall or Tripod Mountable
Weight 3.3 oz
93 g		 50 g 3.3 oz
93 g		 3.3 oz
93 g
Data Non-Volatile N/A Non-Volatile Non-Volatile
Settings Non-Volatile Non-Volatile Non-Volatile Non-Volatile
Software Instrument-Manager
NSRT-Community-Noise-Metrics		 Instrument-Manager Instrument-Manager
Instrument-Listener
NSRT-Community-Noise-Metrics		 Instrument-Manager
NSRT-Community-Noise-Metrics
Timer Yes No Yes Yes
FFT Resolution (For Real-Time Display Only, Not Recording) 2048 points 2048 points 2048 points 2048 points
Generic Audio Driver Support Included Optional Included Included
Generic Com Port Driver No Yes No No
Platform Support Windows Windows, MacOS, Linux (and any platform that includes a generic USB CDC-class driver) Windows Windows
Open Communication Protocol No Yes (VCP over USB) No Yes (MQTT over WiFi)
Rechargeable Battery Autonomy 7-Days (Recording) No Battery 7-Days (Recording) 7-Days (Recording)
Recording Memory 128 Mb No Memory 128 Mb 128 Mb

Sound Level Meter Documentation

ENGLISH VERSION

VERSION FRANÇAISE

NSRT_mk4_Spark Data Sheet

NSRT_mk4 Data Sheet

NSRTW_mk4 Data Sheet

NSRT_mk4_Dev Data Sheet

NSRTW_mk4 User Manual

NSRT_mk3_mk4 USB Audio Interface

NSRT_mk4 Calibration

Cloud Instrument Setup

NSRTW_mk4 MQTT Protocol

NSRT_mk4 Dev Com Protocol

Over the Air Reconfiguration

Fiche Technique NSRT_mk4_Spark

Fiche technique NSRT_mk4

Fiche technique NSRTW_mk4

Fiche technique NSRT_mk4_Dev

NSRTW_mk4 Manuel d’utilisateur

NSRT_mk3_mk4 Interface Audio USB

NSRT_mk4 Étalonnage

Reconfiguration à distance