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How the TC-Log memory works
A thermocouple sensor is made by a cold spot and a hot spot. The hot spot is the one sensing temperatureon the tip of the cable, cold spot is usually a sensor placed internally, in the box of the device, that is usually
but not always coldest than the hotspot (that is why is called cold spot). The thermocouple sensor works
calculating the difference between the resistance read in the two spots.
TC-Log uses 1 cold spot every 2 sensors. Each sensor has a position from 1 to 8 and the cold spot areplaced in this way: for position 1 and 2 there is cold spot 1; for position 3 and 4 there is cold spot 2; forposition 5 and 6 there is cold spot 3; for position 7 and 8 there is cold spot 4. This means a total of 12
reading points
Sensor Cold spot
123
4
56
7
81
23
4

Logger has a certain amount of memory which is divided according to the number of the sensors you areusing. Consider that the values of the cold spots are saved also so, even if you don't see them and they use
less memory than an acquisition from the thermocouples, the logger will save data, and so will use memory,for the cold spots too.
If you use just one thermocouple, no matter in which position, you can record up to 104.855 acquisitions.

1 Sensor Only on Position 1 > 104.855 Acquisitions Total
If you put another thermocouple on a position using the same cold spot, for example you put thermocouples
on positions 1 and 2 you will save data from thermocouple 1, thermocouple 2 and their cold spot, because
they share the same one. It is 65,534 for each thermocouple

2 Sensors Only on Positions 1 and 2 > 65.534 Acquisitions per Sensor(sharing Cold Spot 1)
And so on.
If you place two thermocouples on two positions not sharing the same cold spot, you will need to record datafrom two cold spots, so the total is divided by four. You always read only two thermocouples as the example
above but since you have placed the sensors on two position that do not share the same cold spot (forexample position 1 and position 3), you add an extra sensor (the cold spot for position 3). So, each sensor
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will record up to 52.427 acquisitions.

2 Sensors Only on Positions 1 and 3 > 52.427 Acquisitions per Sensor(recording data from Cold Spot 1 and from Cold Spot 2)
If you use 8 thermocouples it means you are recording data from 8 sensors + 4 cold spots (1 cold spot every twosensors). So you have a total of 12 spots to record and this means 16383 acquisitions per sensor.
There are many possibilities according to where you place the sensors. It is recommended to connect the sensors insequence (position 1, 2, 3...) and not jump from one to the other, to avoid using memory for cold spots.
The software will tell you number of acquisitions and maximum duration of the mission according to acquisition step andwhich sensors are connected.
Number of active channels

Position of the channels *Number ofacquisitions

1

everywhere

1048552

adjacent

65534

2

2 not adjacent

52427

3

2 adjacent + 1 more

40329

3

3 not adjacent

34951

42 adjacent + 2 adjacent

32767

42 adjacent + 2 not adjacent29126

44 not adjacent

26213

52 adjacent + 2 adjacent + 1 not adjacent

24965

52 adjacent + 3 not adjacent

22794

6

2 adjacent + 2 adjacent + 2 adjacent

21844

6

2 adjacent + 2 adjacent + 2 not adjacent

20164

7

2 adjacent + 2 adjacent + 2 adjacent + 1 not adjacent

18078

8

2 adjacent + 2 adjacent + 2 adjacent + 2 adjacent

16383* Adjacent position indicates 2 thermocouples that occupy the channels on the same raw (1-2) (3-4) (5-6) (7-8).

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