Decagon Em5b Data Collection System

Low Cost Analogue Mini-logger

The Em5b is a low cost, limited use five-channel mini-logger. It powers and reads the EC-5 and 10HS soil moisture sensors, the rain gauges, and the ECT temperature sensor.

Designed for use over the growing season, the Em5b runs for 5-6 months on 4 AAA-size alkaline batteries and has 46K of Flash Data memory (138 days at 1 scan/hour).

The Em5b comes with ECH2O Utility software for setting up and downloading data.


  • Cost. The Em5b allows you to add inexpensive peripheral sites to a study.
  • Perfect for a season's worth of basic soil moisture data.


  • Limited weatherproofing. Needs to be protected from the elements.
  • Not designed to be accessed on a weekly basis.

(Port 1 must be unplugged before dowloading data.)

  • Only reads analogue sensors.

(Decagon's analogue sensors include the EC-5 and 10HS soil  moisture sensors, the low and high resolution rain gauges, and the ECT humidity & temperature sensor.)

Feature Specification
Input channels 5 channels for analogue Decagon sensors
Data Storage 46 KB (138 days @ 1 scan/hour)
Sensor Types EC-5, 10HS, GS-1 and RT-1
Operating Environment -5 to 45°C, up to 100% RH
Power Requirements 4 AAA alkaline batteries (typically good for several months)
Case Dimensions 8.7 cm x 6.2 cm x 3.5 cm
Case Material Impact-resistant IP52, NEMA 3R
Interface Cable Serial or USB (cable included)
Software Interface ECH2O Utility, ECH2O Utility Mobile
Warranty One year, parts and labour

Non UK/Ireland Customers

Non UK/Ireland Customers, please contact Decagon Devices at:


Click here for a quick comparison of our Dataloggers.

EM5b Manual
Size: 383.1 KB (392,274 bytes)

Environmental Catalogue
Size: 2.5 MB (2,581,813 bytes)

Quotation Request

Email us to request a quotation for the Decagon Em5b Data Collection System