Chatter datalogger

Today, data logging is not just processing data such as oxygen, pH or levels. To help adapt and improve our infrastructure, we measure and log data from reservoirs, lakes, rivers, streams, creeks, groundwater, surface water, harbors and many other places.

Logging data far away from urban areas is handled by a battery powered data logger that gathers information and sends it to a SCADA system, dedicated databases or even as e-mails when suitable.

Publicly placed data loggers are secured against vandalism and will send a warning when tampered with.

Sending data once a day will provide at battery life time of up to five years.

Information on ground water levels and early warning sewer systems in correlation with nearby urban construction can save millions of Euros in damage.

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    Get information delivered via GSM/GPRS network.

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    Chatter can send an emergency alert in case of downpour.

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    MJK continues to develop firmware and software.

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    Chatter can also make overflow calculations.

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    Easy installation and built-in setup wizard.

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    Tank monitoring can send emergency alarms as SMS in case of sudden drop in level.

MJK has developed Chatter, which is an advanced data-logging unit that runs stably and safely in nature, wells and overflow structures.

Among other things, Chatter logs level via the Expert hydrostatic level transmitter. Data is stored and transferred via GSM/GPRS as e-mail, SMS or in CSV format directly into your SCADA system, e.g. via RS485 ModBus.

Chatter data logger is mostly used to monitor for overflow in wells and sewer overflows.

Alerts are sent from the device in case of low battery or unauthorized access. MJK Chatter does not need regular supervision, which makes it easier for you to plan your time.

For efficient management of drinking water, Chatters are often used to monitor and log level, pressure, temperature and flow rates in e.g. drinking water distribution and boreholes located outside normal power sources.

Thanks to the intelligent communications solution, it is possible to connect the controllers so that they can retrieve data from meters everywhere on the system. Data is securely transmitted as an SMS, e-mail with attached CSV file or over the GSM/GPRS network.

The MJK Chatter is perfect for logging i.a. level in overflow basins. Chatter does not need a power cable, as the built-in battery handles the daily tasks.

Logged data is transmitted via GSM/GPRS, either as planned by you, or triggered by alarms. The latter as security against authorized access to technical installations.

In Denmark alone, there are currently more than 1,200 Chatter units monitoring water levels in nature. Among other things, lakes, streams and groundwater levels are measured for statistical use.

To save power, Chatter is only activated for a very short period at a time. Therefore, the battery can last up to five years when measuring once a day.

In addition to monitoring nature, Chatter is also used in many building-sites. Here, the groundwater level is monitored to avoid subsidence damage to nearby buildings which may lead to compensation claims.


MJK Chatter data logger is produced in two different versions; a wall-mounted and a pipe-mounted. Here you can see the wall-mounted cabinet. It logs overflow data in a sewer well.

Right next to the cabinet is a white antenna. Chatter is equipped with a built-in antenna. However, mounted in a sewer, or in places with poor connections, an additional antenna can ensure the GSM connection.


Chatter data logger has a built-in burglar alarm, which is why it is often used on installations in forests and open country.

Many waterworks also use the alarm system as an extra security in connection with the protection of an invaluable resource.


A Chatter can operate for up to five years without supervision. This makes MJK Chatter perfect for nature monitoring.

This Chatter device monitors the level of a lake, and sends the collected data for statistical use. The device itself sends a warning in case of vandalism or when the battery is running out of power.

Chatter Link Introduction Video

A short video showing the installation process and a brief overview of the user interface.

Chatter Wall. 1. Intro

Short introduction to the wall-mounted Chatter from MJK.

Chatter Tube. 1. Intro

Short introductory to the tube-mounted MJK Chatter data logger.

One-year warranty









Power supply
Built-in 3,6 VDC, 19 Ah lithium battery
Better than 5 years@1 measurement/day and 1 call/day
Memory storage
RTU and E-mail version: 90.000 measured values (date- and timestamped)
Build-in GSM/GPRS quad-band 850/900/1800/1900 MHz modem w/ on-board SIM- card holder
Digital inputs
4 pcs. 2 - 5 VDC (min. time for state 1 second)
Analog inputs
4 pcs. 0 - 2,5 VDC
Serial Data input
1 pcs. RS-485 Modbus® com port for max. 4 units Modbus® RTU-mode, 9600 baud, 2-wire RS-485, Master mode, Function 3, Read only