The data logger for meteorological monitoring

E-log has been explicitly designed for environmental applications: it is equipped with specific inputs for a wide range of sensors and calculations of derived quantities. E-Log stores the data from the connected sensors and supports different communcation protocols both in input and output. Robust and reliable, E-Log makes measurements possible even in the most severe environments, while the 16-bit A/D converter ensures accurate and reliable data in classic meteorological, hydrological and air quality applications and – more generally – in any environmental application.


Code: ELO3305, ELO3305.1



  • N. 8/16 analog inputs, n.4 digital inputs,;
  • Input extension using MASTER/SLAVE configurations;
  • Extremely low power consumption;
  • N. 99 measurements between channels for sensor acquisition and derived quantities;
  • Internal library for calculating derived quantities and mathematical calculations;
  • 8MB Flash Memory;
  • Modbus-RTU Master/Slave, TTY protocols;
  • Transmission (push) of data in ASCII format with FTP protocols;
  • N. 2 RS232 ports (ELO3305);
  • N. 1 RS232 port and N. 1 RS485 port (ELO3305.1);
  • Digital outputs to implement external devices with programmable logics or events;
  • Acquisition rate from 1 s to 12 hours;
  • Elaboration rate from 1 s to 12 hours;
  • Connection to the PC via RS232 (USB/Ethernet/Modem GPRS with external accessories);
  • Display and keyboard.

Inputs for analog and digital sensors
Free terminal inputs

•N.8 analog diff erential inputs (N.16 single -ended)

• N.4 digital inputs (Pulse/Frequency)
To increase the number of inputs, two E-Log units can be jointed together
using a Master & Slave using a RS232 (ELO3305) or RS485 (ELO3305.1) connection.

Inputs for Serial sensors

The E-Log COM-2 port can be connected to sensors with different protocols:
• Modbus-RTU on RS232 or RS485 (with adapter external DEA504 for model ELO3305, directly for model ELO3305.1)
• GILL (Gill format, polar, continuous)
• BIRAL (SWS050 – SWS100, SWS200 –SWS250)
• LUFFT (UMB binary)
E-Log can also be connected via RS232 to EXP301 radio receiver to receive signals from LSI LASTEM’s radio sensors (EXP line).

Sensors acquisition rate

Acquisition rate is programmable for each input (from 1 second to 12 hours).
E-Log manages 12 channels from analog sensors and 8 derived quantities in 1 second.
To limit energy consumption from sensors requiring power supply, it is possible to set an advanced power supply from the acquisition event, (warm-up) that is interrupted immediately after the acquisition itself.

Statistical elaboration time base

The raw measured values can be stored directly as instantaneous values, or be stored as statistical processing (from 1 second to 12 hours):
• Average/Minimum/Maximum/Standard Deviation
• Wind elaborations
• Totals

Derived and calculated quantities

Internal library of derived environmental quantities.
These calculations use acquired quantities, constant values and other calculated quantities. The library also includes mathematical functions. (See Derived Quantities table). E-Log manages up to 99 channels
between acquired, derived and calculated quantities.

Data memory

Internal memory (8 MB) allows to store data typically for several weeks. The registration structure is circular.
Storage autonomy is a function of the number of connected sensors and of the confi gured processing rate.

Data communication (devices)

It is possible to transfer data to a PC via:
• RS232, USB (with adapter included )
• RS485 with external adapter (DEA504 / 504.1) for model ELO3305, directly with ELO3305.1
• Modem GPRS (DEA718.3)
• Radio (DEC015.1)
• Ethernet (DEA553)
(see Accessories)

Data communication protocols

Via GPRS modem, data are sent (push mode) to the IP address of a remote PC/Server in ASCII format and FTP protocol. Alternatively, via GPRS or Ethernet, E-Log uses a proprietary binary protocol to transmit data using the LSI LASTEM communication programs: 3DOM, CommNET.

Data communication protocols (Modbus)

In the E-Log models it is possible to send data to Modbus Master devices via:
• Modbus RTU: on RS232 or RS485
• Modbus Encapsulated TCP on Ethernet (using DEA553 adapter)
• Modbus TCP over Ethernet (using DEA509 adapter)
The data transmitted with the Modbus protocol can concern instantaneous values, but also mobile statistical values*.

*Mobile data are values whose statistical basis corresponds to the last observation period. Example: mobile temperature average over 10 minutes (each minute the value is updated always considering the aver-
age value of the last 10 minutes).

Communication time rate

When data are sent via GPRS modem (push mode) to the IP address of a remote PC or server, it’s possible to set a sending rate from 3 minutes to 24 hours.

Switched power supply outputs

N.7 independent electrical outputs to supply external sensors and devices that can be activated with confi gurable logics depending on the data acquired.
These outputs become relay outputs with a special external module (MG3023).

Built-in Temperature sensor

Built-in Temperature sensor (accuracy 0.5°C).

Firmware update

E-Log has a function (Boot loader) that allows you to send, via RS232, a fi rmware update from a PC directly connected via RS232, USB.


E-Log is equipped with the following peripherals:
• N.2 RS232 DCE port
• N.1 porta RS485 (ELO3305.1)

Data Logger confi guration

The confi guration is carried out by means of the 3DOM program on PC. The confi guration fi le is sent to the instrument via RS232, USB. RS485 or Ethernet with external optional devices.


E-Log is equipped with a back-lit LCD display (4×20 chrs). The following information are listed:
• Real-time measurement list
• Dignostic

Clock synchronization

The internal clock (accuracy 30 seconds/month) is updated through the 3DOM confi guration program, or via the CommNET data communication program that updates the clock at each connection.

Power supply

E-Log runs at 10÷14 Vcc. The batteries are external and are housed in the available ELF boxes. (see Accessories).

Power consumption and battery duration

E-Log has a very low power consumption (standby < 4 mW), 140 mW during measurements. Without powering external sensors or communication devices, using a 15 Ah battery, it has several months power autonomy.


E-Log can be placed inside IP66 enclosure (ELF series). LSI-LASTEM off ers a selection of ELF enclosures (see Accessories) against shock, water, dust and atmospheric agents. Depending on the ELF’s models, the
enclosure can also accommodate power systems, communication devices and batteries.


Derivated Quantities

LSI Lastem data loggers have an internal library of formulas for calculating a series of environmental quantities. These quantities are obtained from measured parameters, entered by the operator and other calculated quantities.

  • Absolute Humidity (VDI3786 Part 4)
  • Air changes (1997 Ashrae Fundamentals Handbook)
  • Air Flow (1997 Ashrae Fundamentals Handbook)
  • Air Speed (using Pitot and Darcy tubes)
  • Absolute Pressure (sea level)
  • Dew Point (ISO7726)
  • Heat Index
  • Evaporation
  • Mean Radiant Temperature
  • Radiant Temperature Asymmetry (ISO7726)
  • Operative Temperature (ISo7726)
  • Plane Radiant Temperature 1&2 (ISO7726)
  • Partial Vapour Pressure
  • Psychrometric Humidity (ISO7726)
  • Specific Humidity (VDI3786 Part 4)
  • Sunshine Duration
  • TCH – Chill Temperature (ISO TR11079)
  • Wet Bulb Temperature (ISO7726)
  • UV Exposition
  • UV Index
  • Wind Chill Index (ISO TR11079)
  • WBGT Index IN+OUT Formulas
  • % dissatisfied by Floor (ISO7730)
  • % dissatisfied by Vertical Temperature (ISO7730)
  • % dissatisfied by Radiant Asymmetry (ISO7730)
  • % dissatisfied by Air Draw (ISO7730)
  • Daylight Factor (IESNA Lighting handbook)
  • Light Intensity
documents LSI Lastem