The following picture show in detail the Thermocouple Temperature Logger.

The Thermocouple Temperature logger / analyser has 3 LEDs to indicate its status. These LEDs are:

• SD Card Activity: shows the SD Card communications activity (writing to or reading from) when flashing. An error has occurred when this LED is permanently ON.

• Device status: shows the device status. This LED is permanently ON on a normal operation status. An error has occurred if this LED is flashing.

• USB Activity: shows the activity of the USB communications when flashing. An error has occurred when this LED is permanently ON.

The device has a USB mini B for setting up its configuration, sending data to the PC software and powering the device. The device can also be powered from an USB power supply or from a power bank.

🗒 The USB voltage for powering the device must be 5V (± 5%).

The device has a push-push micro SD Card socket. The thermocouple temperature logger / analyser supports a micro SD Card of up to 32 GB formatted with FAT32. The maximum file size is 4 GB. The device is able to write approximately 10,000 samples in a single 1.4 MB file.

The push button on the device has the following usages:

• Start / Stop logging data to the micro SD Card.

• Enter to the "Device Firmware Update" mode.

To enter into "Device Firmware Update" mode, the push button needs to be pressed while powering the device.

The Thermocouple Temperature Logger / Analyser has 5 pluggable terminal block connectors (included with the device. Farnell order code: 3704907) that are used for connecting the thermocouples to the device.

The following image shows the connection between a K-Type thermocouple and the device terminal block.

The “Thermocouple temperature logger / analyser” can display the information in real-time by using the Diagonal Systems software.

After clicking on the button “Connect” the program will open a new window for searching and connecting a “Thermocouple temperature logger / analyser”. By clicking on “Connect” inside this window, the program will connect to the desired device and it will show the information related with the device. Different devices can be connected to the same computer by running more times the software. The software will notify if the connection is not stablish to the device. By clicking the button “Get info” the software will show the connected thermocouple temperature logger general information.

In order to set the software configuration the button called “Configuration…” can be clicked. This will open a new window.

The following parameters can be configured:

• • • Plot temperatures: Selects the temperature sensors that will be plotted.

    • Format: Shows the temperature on degrees Celsius (°C), Fahrenheit (°F) or Kelvin (°K).

    • Show symbols: Toggles between showing a symbol on the plotting graph every time the software gets a temperature sample.

    • Force Range: Forces the plotting graph to be plotted including the zero.

    • Plot Samples: Numbers of samples that will be plotted.

    • Animated Plot: Animates the plot every time the software gets a new sample.

    • Temperature Labels: Changes the generic temperatures names.

The following image shows a screen capture of the software configuration window.

By clicking the button “Device Config...” a new window will pop up where the thermocouple temperature logger can be configured. The following parameters can be configured:

• • • SD Card Write [ms]: This is the time when the device will write a new set of values to the SD Card. Accepted values between 20 ms to 3600000 ms. Any value higher or lower than the accepted will be modified automatically by the maximum or minimum value.

    • Format: The format of how the temperature will be written to the SD Card. Selectable from degrees Celsius (°C), Fahrenheit (°F) or Kelvin (°K).

    • Floating zeros: The number of digits after the decimal point that will be written to the SD Card of each temperature sample. Selectable from 0 to 6.

    • Open File: Tells the device when to create a new file to the SD Card for logging the data.

    • Start Logging: Tells the device when to start logging new data to the SD Card. The “Thermocouple Temperature logger / analyser” will start logging when powering it up if the option “On Power Up” is selected. If the option “Push Button” is selected, the device will not start logging when powering it up and the push button must be pressed to start logging data into the SD Card.

    • Recovering Logging: Changes the behavior of the device after a power cycle while logging. If the “Thermocouple Temperature logger / analyser” was logging data and the power supply gets removed or lost, the device will start logging data automatically after recovering its power supply.

🗒 If the device start logging when a power cycle when the option of “Recovering Logging” is selected, a new file will be created.

The time and data on the device is displayed in this area of the configuration window. The time and date are taken from the Windows system.

For logging the data directly to the PC the button called “Log Data…” needs to be clicked. This action will open a new window to select the location and name of the logging file. If the software is writing data, the same button will show the label “Stop Logging”. By clicking on it will stop the logging data.

Once the “Thermocouple Temperature logger / analyser” is connected to the Windows program, the device will report the measured data by clicking the button “Run”. The data reported from the device to the Windows software is received once a second.

The button “Clean Plot” will remove all of the data from the plotting graph.

By clicking on the button “Save Plot…” will open a new window for selecting a file of where to save an image of the current graph. The plotting area will be saved as a "PNG" format image.

In order to update the firmware on the device, the customer can download from the Diagonal Systems website the “Device Firmware Update” Windows program and the latest available firmware for the “Thermocouple Temperature Logger / Analyser”.

The first step to update the firmware is to invoke the “bootloader mode” on the device. To do this, it is needed to keep pressing the push button while powering the device via USB from the PC.

Once the device is in “bootloader mode”, the PC program will be able to search and connect to it by clicking the button “Search Device”. If needed, the device information can be read and it will be shown on the program.

The new firmware can be loaded to the “Device Firmware Update” Windows program and after doing this, the new firmware can be loaded to the unit clicking on the button “Update Firmware”. We recommend “erase the application”, that will remove the previous firmware programmed on the unit.

The device will organize the logging files in folders. These folders are named based on the number of the year, month and day (Temp/YYMMDD/) that is programmed to the internal Real Time Clock. For example, if the device starts logging data on the 24th of April of 2017, it will log the files inside the folder 'Temp/170424/'. Similar to how the folders are named, the files will be named based on the number of the hour, minutes and seconds that every file is created (HHMMSS.csv) with the extension “.csv”. The Comma Separated Values (CSV) files are a plain text file that contains a list of data. These files are often used for exchanging data between different applications.

The “Thermocouple Temperature Logger / Analyser” can be configured depending on needs of when to start logging. It can be configured for starting logging new data every time it gets power or it can also be configured for logging data only when the push button is pressed.

At the same time, the device can get the configuration of start logging when the power gets lost and restore (only in case that the device was logging when the power got lost).

The following diagram shows how the device behaves when it is powered up.

The device has an internal 1220 coin cell socket for maintaining the internal Real Time Clock when it is not powered.

For replacing the coin cell battery, follow the steps:

• • • Remove the screws on the bottom of the unit.

    • Take off the old coin cell battery.

    • Place the new coin cell battery with the right polarity as the image shows.

    • Close the unit and screw it back.

    • Reprogram the real time clock calendar using the “Diagonal Systems – Thermocouple Temperature Logger / Analyser” Windows program.

⚠ The positive side of the battery must be facing up.

⚠ Avoid shorting the new coin cell terminals. This can make it discharge or heat up.

⚠ Remove all of the connections before opening the device.