MJK Chatter ® Battery Powered Data Logger With Modem
Chatter ® Battery Powered Data Logger With Modem


  • MJK Chatter ® Battery Powered Data Logger With Modem for monitoring and measuring of, among other things, level where no permanent power supply is available.
  • Contains a built-in multi-channel data logger, a GSM/GPRS modem including a battery which ensures more than 5-year life time on the battery for one call a day.
  • Transmits data over the internet to a Microsoft SQL data base by means of the integrated GPRS modem.
  • Alarm notifications through SMS. 
  • Housed in an impact-proof aluminium and plastic casing for mounting directly on bore holes and sounding borings where sensor, electronics and antenna are protected from vandalism.
  • In this configuration log- and call intervals can be preset.
  • Meanwhile the entire system is in hibernation mode, practically without using any electricity.
  • At the chosen log- and transmission time the Chatter awakens, measures and transmits the data.
  • Such a wake up can be as briefly as 10-15 seconds, with means the battery can last more than 5 years.
  • Available in an IP 67 / NEMA4 polycarbonate cabinet for wall mounting with a 230/115 V AC or 10-30 VDC supply. 
  • Analogue, digital and modbus inputs, a connection of new as well as existing measuring units is possible. 
  • To save electricity, Chatter® only supplies the connected transmitters for the time the measuring takes place, typically less than 10 seconds per measurment.
  • By choosing the Modbus connection, measurement signals are transferred to Chatter® with a maximum resolution, since there is no analogue-to-digital signal handling involved in the circuit.
Technical Specification  
Digital Inputs 4 pcs. 2 - 5 VDC (min. time for state 10 seconds)
Analog Inputs 4 pcs. 0,1 - 2,5 VDC
Accuracy Better than ± 1% for the inputs
Resolution 10 bit, input impedance: min. 10 Kohm
Data Inputs 1 pc. RS-485 Modbus® input for max. 4 units. Modbus® RTU-mode, 9600 baud, 2-wire RS-485, master mode for max. 4 pressure transmitters, flow transmitters or data loggers. Configuration of connected Modbus® pressure transmitters.
Power Supply 2 pcs. 3,6 VDC for pressure transmitters and 1 pc. 5 VDC ON/OFF-controlled by a microcontroller. +5 VDC can be replaced by +10 or +15 VDC.
Interface Connector Internal USB 1.1, type mini B, female
Antenna Connector MMCX, female
Data Transmission GSM/GPRS quad-band 850/900/1800/1900 MHz supporting TCP/IP. On-board SIM-card holder, TCP/IP socket connection over GPRS and Internet.
Memory Storage 30.000 measured values (date and time stamped), data measurement and logging at fixed time intervals
Log Intervals 10 secs, 1 – 10 min, 1, 2, 4, 8, 12 or 24 hours
Call Intervals 10 min, 1, 2, 4, 8, 12 or 24 hours, 1 week
Power Supply Built-in 3,6 VDC, 19 Ah lithium battery
Performance 5 years@1 measurement/day and 1 call/day
Mounting In tubes with inner diameter Ø2.5-4.2 in. or on wall
Temperature Range - 4 °F ... +140 °F
Air Humidity Max. 95% relative
Clock Real-time clock with 1-sec. resolution, 24-hour clock
Enclosure Rating IP 67
Antenna Mounted in/on Tube: Built-in Wall: see data sheet GB 6.3 GSM/GPRS Antennas
Materials Mounted in/on Tube: PC-ASA (top) and aluminum (base) Wall: glas-reinforced PC (polycarbonate)
Weight Tube mounting: 4 lbs Wall mounting: 1.6 lbs
Dimensions Mounted in/on Tube: Ø7.5 x 5.9 in. (inner dia. Ø2.5-4.2 in.) Wall: 6.2 x 5.7 x 3.3 in. (W x H x D)
CE Approvals EN 61000-6-2:2001, EN 61000-6-3:2001



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