• 2 Input channels with miniature TC connectors
  • Supports J, K, T, N, E, R, and S thermocouples
  • Storage rate of 5 seconds to once/day
  • Store up to 240,000 measurements
  • USB communication interface
  • Simple LED status display
  • Battery powered



The AEMC L642 Temperature Data Logger is a two-channel thermocouple data logger. Operators can freely choose between data storage modes and storage rates to effortlessly configure the logger. Extended Recording Mode (XRM®) and delayed start time are just two of the many application friendly features.

The Simple Logger® II Model L642 records temperature at user selectable rates of 1 every 5 seconds to 1 per day. Using J, K, T, N, E, R or S thermocouples, it can measure from -346ºC to + 1767ºC with resolution down to 0.1º (range dependent).

The main advantage of the logger is its ability to perform a variety of recording tasks with easy and intuitive setup from a computer using DataView® software.

Analog information on the input is sampled and converted to a digital signal. This digital signal is processed and stored along with scale and time information. An optically isolated Universal Serial Bus (USB) port provides for the transfer of data from the instrument’s internal memory to the computer for analysis.

  • HVAC and refrigeration monitoring
  • Equipment monitoring
  • Process monitoring
  • And many more


Channels Two
Input Connection Two miniature thermocouple connectors
Measurement Range (3 ranges/channel) °F (°C)
J: -346 to +2192 (-210 to +1200)
K: -328 to +2501 (-200 to +1372)
T: -418 to +752 (-250 to +400)
N: -328 to +2372 (-200 to +1300)
E: -238 to 1742 (-150 to +950)
R: 32 to 3212 (0 to 1767)
S: 32 to 3212 (0 to 1767)
Resolution 0.1°C/F < 1000°C/F; 1° >= 1000°C/F
Accuracy (50 or 60Hz) 0.1% to 0.2% + 0.6°, depending on the range and T/C type
Sample Rate 8 samples at storage interval
Storage Rate Programmable from 125mS to 1 day
Storage Modes Start/Stop Mode
First In First Out Mode (FIFO)
Extended Time Recording Mode (XRM)
Recording Length 15 minutes to 8 weeks, programmable using DataView
Memory 240,000 measurements (512KB) The recorded data is stored in non-volatile memory & retained even if the battery is low or removed.
Communication USB 2.0 optically isolated
Power Source 2 x 1.5V AA-cell Alkaline batteries
Battery Life 100 hours to >45 days (dependent on storage rate/recording length)
Dimensions 4.94 x 2.75 x 1.28″ (125 x 70 x 32mm)
Weight (with battery) 7 oz (200 grams)
Case UL94-V0
Vibration IEC 68-2-6 (1.5mm, 10 to 55Hz)
Shock IEC 68-2-27 (30G)
Drop IEC 68-2-32 (1m)
Operating Temperature 14° to 122°F (-10° to 50°C)
Storage Temperature -4° to 140°F (-20° to 60°C)

Recording Modes

Start/Stop Mode

In this mode the operator selects a storage rate from predefined values from 8 per second to 1 every day, then selects a start and stop time. Data is recorded at this rate until the memory is filled or the end recording time and date is reached. The logger then stops recording and goes into standby mode retaining the recorded date.

First In First Out Mode (FIFO)

The operator makes the data storage and recording length selections as described above. If the memory fills before the end date and time occurs, the logger will discard the oldest stored data point and add a new one. This process will continue until the end recording date and time is reached.

Extended Time Recording Mode (XRM)

This unique recording mechanism provides for continuous recording over a longer period of time without the need for the operator’s selection or adjustments. The operator selects a starting storage range from predefined values from 8 per second to 1 every day and a recording length. The logger will store data at the rate selected until the memory is filled. The logger will then discard every other stored sample beyond the first one, freeing up half the memory for continuous recording. New samples will be stored at half the previous storage rate, matching the interval with the remaining stored data. This process will repeat each time the memory fills until the operator stops the recording manually, the end recording date and time is reached or the battery runs down.