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Vibrating Wire Ten Channel Data Logger DT2055:

These are produced as a .csv file which can be viewed in Microsoft Excel.  They have set headers which populate as the data is recorded to the file in date/time order.  Below is a sample of the headers you are presented with:

These files have the same headers and titles as the DT2011-B but with more columns to represent the number of sensors.

Although both the DT2011-B and DT2055 loggers use the same software, the firmware is different.  This must be kept up to date at all times.  You can access the latest version from the following link:

http://www.rstinstruments.com/SOFTWARE%20DT2055.html

The following is a brief description of each title:

Model:  This describes the model of data logger which the file has been retrieved from.  This cannot be changed by the user.

Name:  The assigned name to that particular data logger.  By default they are named as above however this can be changed to suit the borehole or sensor name/reference.

Serial Number:  This can also be viewed on the face plate of the logger itself.  When returning any suspected faulty data loggers you will be asked for this number.

Firmware Version:  This is the version of the software that is currently installed on the data logger itself at the time the file was downloaded.  Usually you are prompted when connecting to the data logger that the Firmware is out of date and should be updated.  Regardless, this should always be compared to the latest version of this found on the above web page.

Software Version:  This is the version of the software installed on the computer of which was used to download the data file.  This must also be kept up to date at all times and when connected to an internet connection, it should automatically download any updates it might need.  You can also obtain the latest version from the above link.

Sampling Status:  Consists of two fields, one of which confirms the logging status it was in at the time the file was downloaded (usually “LOGGING”) and the other to the right of this cell confirms whether you decided to download it as a new file “RESTARTED” or append to an existing data file you have retrieved previously “APPEND”.

Sampling Rate:  There are two options this could be:  “FIXED” or “MULTI”.  Fixed being that there is no variation in the recording interval that has been set by the user.  There is also the function within the data logger that allows you to set Multi-Interval durations whereby you can set up to varying 12 intervals and assign the frequency of which each interval runs at.  

Current Interval:  The logging interval that is currently set on the data logger at the time the file has been retrieved.

Start Time & Current Time:  Start Time being the date and time at which the data logger was set to start logging.  Current Time being the time at which the data file was retrieved from the logger.

Number of Sensors:  For the DT2011-B this figure will always be 2.  It relates to the amount of signals it receives from a sensor so the Vibrating Wire sensor that it is connected to would be outputting 1no. VW Signal and 1no. Temperature. 

Number of Records:  How many logged records there are in that date file.

Sensor Upload Num/Error Code:  There are three numbers here to take into account most of which are just for information purposes.  The first number relates to the amount of times the sensor configuration has been changed and uploaded to the data logger such as base reading/calibration factor.  The other two numbers are for manufacturer use only and relate to debugging and fault finding where customers encounter a problem with their data file and/or logger.  This is more of a status indication rather than an “Error” and as such this will soon be changed to “Status Code”.

Following these header titles will then be the data files and details of any calibration factors that have been applied to the data.  There will always be the following:

  • TIMESTAMP – Of the reading logged
  • RECORD – Number of that reading in sequential order
  • BATTERY – Battery voltage reading at that time of reading
  • VW 1 – The engineering unit value programmed into the logger by the user.  If no Engineering factors have been applied this would be in “B units” which is Hz2/1000
  • THERM 1 – Outputs in degrees Celsius unless otherwise amended.

To the right of these columns is more information relating to the output of the VW signal, Thermistor and the Actual Logger Temperature.  VW 1 will give the raw reading from the Vibrating Wire sensor in B units.  Therm 1 will give the raw reading from the Thermistor plugged into the logger which is measured in Ohms.  The data logger already has the Steinhart Coefficients programmed into it which is how it converts this reading to degrees Celsius.