OMC-042 Date logger main
OMC-042 GPRS Data Logger
The OMC-042 data logger is a small, rugged, ultra low power device. This small data logger was specifically designed for remote areas without mains power.

  • QUAD-band GPRS-modem.
  • Temperature sensor and power monitor.
  • 2 GB micro SD card and a SIM card slot.
  • 3.6 Volt Lithium battery or optional 8..30 Vdc external power, or 3xAA NiMH for integrated solar panel.


  • Seamless interface to all meteorological and hydrological sensor from Observator Instruments and many more.
  • Supports all major standard interfaces and protocols like RS232, ModBus, NMEA and so on.
  • Drivers are available for a large range of sensors.
  • Other drivers will be created on request.
  • Data from the sensors are stored on a micro SD card, before transmission.

Parameters & thresholds
Thresholds can be defined on all parameters. Whenever a parameter exceeds a threshold, an alarm is generated. This alarm can be send as a text message (SMS) to a mobile phone. The ‘remaining battery capacity’ is also measured as a parameter.

OMC-042 Date logger 2     OMC-042 Date logger 1

Data transfer
The measurement data stored on the 2 GB SD card can be transmitted periodically by GPRS. The logger supports:

  • FTP and TCP/IP.
  • Email and text messages (SMS).
  • USB to a PC.
  • Remote configuration (TCP over GPRS).

Data transfer is done in a simple ASCII file format. The file format is open.

The OMC-042 is available in four different housings, as shown on the next page. Each housing includes the logger, a battery, the GPRS modem and an antenna. So only the sensors are external and everything else is inside. (Exception: the OMC-042-03 version has an external antenna.)


  • 4x 4..20mA 12bit analog inputs.
  • 4x digital inputs or pulse counters.
  • 2x hi-res differential voltage inputs (not for –03 version).
  • 1x RS-232 or RS-485/Modbus.
  • 1x RS-232 or SDI-12.
  • 100 mA@3.6V average current, 250 mA@3.6V average during data transfer, 50 uA@3.6V sleep current.
  • 1x 12V@200mA switchable power outlet.
  • Configuration using OMC-Programmer on USB port.
  • Remote configuration possible using TCP.
  • Rugged, waterproof (depending on the housing).
  • Integrated GSM antenna (not for –03 version). External antenna optional.

OMC-042          Standard OMC-042 (IP-67).
OMC-042-01    OMC-042 with solar panel (IP-67).
OMC-042-02    OMC-042 with small touch screen display.
OMC-042-03    OMC-042 with integration set for rain gauge.

OMC-042-B               Spare battery, lithium 3.6 V.
OMC-042-AP            Spare rechargeable battery set.
OMC-040-002          Cable for external power supply, incl. converter 9-30Vdc to stabilized 3.6Vdc.
OMC-040-004          USB configuration cable.
OMC-Programmer   Free Windows software for configuring the OMC-04X loggers.

Temperature range (operating)    : -30 to +70 ⁰C
Temperature range (storage)        : -40 to +85 ⁰C

OMC-042 standard             : 130 x 120 x 75 mm (l x w x h)
OMC-042-01 solar panel   : 130 x 120 x 125 mm (l x w x h)
OMC-042-02 display         : 130 x 120 x 90 mm (l x w x h)
OMC-042-03 rain meter   : 160 x 80 x 55 mm (l x w x h)