• Dual Channel Thermistor Data Logger

Dual Channel Thermistor Data Logger

with graphic screen

  • Rugged and robust construction
  • Dual channel -40 to +125°C (-40 to +257°F) probe measurement range
  • Logging rates between 2 seconds and 1 hour

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Measures and stores more than 250,000 temperature readings from two thermocouples in the range of -40 to + 125°C (-40 to +257°C) at a resolution of 0.1°C

  • Rugged and robust construction
  • Dual channel -40 to +125°C (-40 to +257°F) probe measurement range
  • Logging rates between 2 seconds and 1 hour
  • Stores over 250,000 readings per channel
  • On screen menu to start, stop, review and restart the logger in the field
  • Micro USB interface for PC based set-up and data download
  • 3.5mm jack socket for connection of supplied thermistor probes
  • Supplied with 2 x 1.0m type 2 sensor probes
  • Immediate, delayed, push-button or temperature triggered start mode
  • Graphic LCD shows real-time readings, data summary, graph and current status
  • User set audible alarm
  • Highly visible confidence/alarm LEDs
  • Supplied with user replaceable ½ AA batteries

This standalone USB data logger measures and stores over 250,000 temperature readings from two thermistor probes over a -40 to +125°C (-40 to +257°C) range at a resolution of 0.1ºC.

Using the Windows control software (available as a free download from www.easylogusb.com) the user can quickly set up the logger name, sample rate, alarm settings and start mode (immediate start, push to start, delayed start or temperature triggered start). This software can later be used to download the stored data which can be graphed, printed and exported to other applications.

The data logger features a dot-matrix LCD and three face-buttons to navigate through an on-screen menu. This menu provides the user with access to real-time trend analysis, data summaries and the ability to start, stop and restart the data logger without the need to connect the data logger to the host-PC. Users can reset the maximum/minimum reading using the on-screen menu; this introduces an ‘event marker’ into the data which can later be viewed in the graphing software (‘Mark Events’ option) and the data file after download.

The data logger is supplied with two replaceable ½AA batteries.

  Minimum Typical Maximum Unit
Supplied probe measurement range -40 (-40)   +125 (+257) °C (°F)
Internal resolution   0.1 (0.2)   °C (°F)
Accuracy (logger error)   ±0.1 (±0.2)*   °C (°F)
Logging rate Every 2 seconds   Every 1 hour Time
Operating temperature range -10 (-14)   +40 (+104) °C (°F)
2 x ½AA 3.6V Lithium Battery Life   4**   Months
* At 25°C. See probe accuracy curve on page 4. Important - quoted accuracy is for the data logger only when measuring within the specified operating temperature. Thermistor error is not included and should also be taken into consideration.

** At 25°C and 10 minute logging rate with no alarm LEDs or sounder and minimal LCD use.


Easy to install and use, the control software runs under Windows XP, Vista and Windows 7. The software is used to set-up the data logger as well as download, graph and export data to Excel. Each stored logging session is saved as a separate file.

The software allows the following parameters to be configured:

  • Logger name
  • Measurement parameter (ºC or ºF)
  • Logging Rate (customisable between 2 seconds and 1 hour)
  • High and low temperature alarms
  • Immediate, delayed, push-button or temperature triggered start mode
  • Disable or enable LEDs and sounder with delayed activation
  • Display and backlight behaviour after button press


All dimensions in mm (inches)


Menu Button Functions and LED Screen Indication
Please note that screens may vary slightly depending on model. EL-GFX-1 screens shown.


We recommend that you replace the batteries every 4 months, or prior to logging critical data.

The EL-GFX-DTP does not lose its stored readings when the batteries are discharged or when the batteries are replaced; however, the data logging process will be stopped. If the batteries are changed within a 2 minute window the EL-GFX-DTP will retain its settings (internal clock and logging mode). This will allow logging to be restarted without additional connection to a PC via USB.

Only use 2 x 3.6V ½AA lithium batteries. Do not mix battery types and do not mix new and old batteries. Before replacing the batteries, unplug the EL-GFX-DTP from the PC.

Handle lithium batteries carefully, observe warnings on battery casing. Dispose of in accordance with local regulations.

If left unused for extended periods of time, the Lithium batteries used in the EasyLog range of data loggers naturally form a non-conductive internal layer, preventing them from self-discharge and effectively increasing their shelf life. When first installed in the data logger, this may cause a momentary drop in the battery voltage (the Transient Minimum Voltage) as the internal layer is broken down, resulting in the data logger resetting. Inserting the batteries in the data logger and leaving it connected to a PC for about 30 seconds will remove this layer. After this, remove and re-install the batteries to reset the data logger. Overall battery life will not be affected.


Thermistor Probe
The probes supplied with the EL-GFX-DTP uses a precision thermistor to sense the temperature. Alternative lengths and probe options are available.

Alternatively, the probe length may be extended by the use of a suitable extension cable. We recommend twisted pair with high quality 3.5mm jack socket/plugs for best results.

Note: The thermistor is externally islated from the probe tip.


Probe Measurement Accuracy

Supplied ‘Type 2’ Thermistor Probe
Part number: EL-PROBE2-1.0M-TP

‘Type A’ Thermistor Probe - sold seperately.