In order to configure Multichannel DT2055B logger with VW piezometers, please follow the steps below.
1- Connect the VW piezometer wires to the data logger, Following the DT2055B installation manufacturer’s user guide (which can be found inside the Datalogger cap). The wires should be connected to their respective terminal positions on the black terminal block, which will then be plugged on its respective port on the data logger circuit board. Figure 1 below illustrate the VW wire connection to terminal block with the guide.
Figure 1: Guide for VW connection & Wires connected on the terminal block.
2- Connect a laptop with the most recent version of DT Logger Host to the datalogger using a Mini USB cable. Open DT Logger Host and let the program connect to the datalogger.
- Once the status window populates displaying Status 6, click the Connections tab >> Options >> Advanced, as shown on Figure 2 below. Set the battery type and initialize the battery. (This should be done each time battery is changed as well) Select the Use Resistance Scaling check box.
- Remove the battery tab from the data logger before leaving the site as the data logger will run off the power supplied by the USB cable until it is disconnected!
Figure 2: Connections tab >> Options >> Advanced
- Note that DT2055 datalogger can have up to 5 VW Piezometers connected to it.
3- The fastest way to setup a new data logger with multiple piezometers is to go to Sensors tab on the top task bar, delete additional sensors leaving VW1 and Therm 1 using the Del Sel button. Fill out VW1 per the instructions below Figure 3.
Figure 3: Sensors tab – fill out following instructions below.
4- To set up the VW go through steps (a,b,c,d,e,f,g) as illustrated on Figure 4 below.
- Change the header to the serial of the piezometer that is connected or to the prefered description.(if desired)
- Use Normal (1200Hz-1550Hz) sweep settings.
- Check Engineering Units (If use of engineering units is prefered).
- Choose either the Linear or Polynomial Method, operators preference under conversion method .
These values are provided on each piezometer Calibration Record. The C value is calculated using the initial B Unit, Temperature and Barometric readings taken before the piezometer is installed.
See Appendix A
- Check the Temperature Correction box and input the values from the calibration record for the piezometer. See Appendix A
- Check the Units Conversion box and choose prefered units. (Input Units are the designated units noted on the Calibration Record (kPa or MPa) See Appendix A, while Output Units are operator’s preference.
- Choose New Copy, the new VW will appear after Therm 1. Change the tab name and the calibration information to the next piezometer that will be connected into Port 2 on the data logger. Click on Therm 1 and choose New Copy to add the Thermistor for the second piezometer. Note: All piezometers use the 3k NTC thermistor.
Figure 4:To set up VW Piezometer
5- To choose the desired decimal digits, click the Display Format button. Figure 5 below
Figure 5: Display Format >> Manual (use drop down up to choose the desired decimal places)
6 - For current readings, go to Monitor on the top task bar, Both the Pressure (kPa or MPa) and the Temperature (0C) will show on display. (it may take few seconds to update) For raw readings, uncheck the Units check box.
Figure 6: Monitor>> Units
7 - To set the readings collection interval on the logger. Go to the Logging tab on the top tool bar as illustrated on Figure 7 below and follow the steps.
- Set the preferred interval
- Choose the start time for the data logger to collect the first reading. (it is a good idea to take some preliminary readings at 1 minute intervals to verify it is working correctly). Sync to Interval will start the data logger at midnight. The operator can choose a specified Start Time or Start Now.
- Sync the datalogger time to the computer time or manually set at Clock options.
- Memory Options will allow the data logger to overwrite older data or stop when it is full.
- After any changes made to be programmed, press the Apply Settings button.
Figure 7 : Readings collection interval settings.
Once the datalogger is connected, the Status screen is the default display on the DT Logger host. It will show programmed information, current state of the data logger and battery information. Figure 8 below
8- To download the data from the data logger, click on the Collect Data button on the Status display page. The data will be stored in the directory designated in the Connections tab. This can be changed by the operator.
Figure 8: Status Page >> Collect Data
Data logger does not connect:
Disable the computer/laptop Bluetooth and re-connect.
Check if the Data logger highlighted on the right-hand side is the one connected. If not, select
the correct logger and re-connect.
Preventing water intrusion into the onto the Data logger
Ensure that all the cable glands have been securely tightened using the gland wrench so that they are properly sealed to protect against water intrusion. Figure 9 below
Make sure the lid is secured properly following the Installation and Maintenance and Service Guidelines.
Figure 9: Gland wrench