NSRTW_mk4_MQTT

565.00 $

SKU NSRTW-mk4-mqtt Category Sound Level Meter Tag NSRTW_MK4_MQTT

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.

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.

✔️ Get help choosing the right model for your integration

✔️ Discuss MQTT broker setup and protocol specifics

✔️ Call us now or get email response within 24h

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)

Talk to an expert

Name

Company

Message

Application

Monitoring Duration

Less than 1 month 1 to 6 months More than 6 months

Number of units needed

Additional details

CALL US: 819-575-1990

Mon-Fri 9am-5pm EST

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
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