Measurand's SAAV is designed to take on a cyclical shape around the inside of the casing as it is installed. To ensure the SAAV is properly seated in the correct cyclical shape, Measurand recommends lifting and pumping it in the casing prior to applying final compression. Measurand also recommends verifying that the SAAV has taken the appropriate cyclical shape by using the SAAV Installation Verification tool in our SAARecorder application.
WARNING: If you are installing a ShapeArray™ instrument in Low Power Mode for use with certain low power data loggers, then you will need to be using a model 004 SAAFPU interface with at least revision R.4B or a model 002 SAA232 interface with revision R.2B. Older interfaces are NOT supported. While the SAAV Installation Verification diagnostic is open, the instrument will temporarily be placed in regular power mode. When the SAAV Installation Verification window is closed, the instrument will automatically be returned to Low Power mode. Do NOT disconnect the ShapeArray™ instrument from the computer without closing the window or the instrument could be left in regular power mode.
In SAASuite 3.0 or higher, the SAARecorder application is launched by clicking the Manual Data Collection button.
Figure 1: Launch SAARecorder from SAASuite by clicking the Manual Data Collection button
Step 1 - Launch SAARecorder and Connect to the SAAV
First you must connect your computer to the SAAV with an appropriate interface. More information on properly connecting your computer and the SAARecorder application to a Measurand ShapeArray is available in the following articles in our Support web site.
- Connecting a ShapeArray to a PC using the SAA232
- Connecting ShapeArrays to a PC using the SAA232-5
- Connecting to a PC Using the Portable Diagnostic Unit
- Connecting to a PC using the SAAFPU
- Connecting to a PC using the SAAUSB
NOTE: A pre-recorded raw data sample from SAARecorder (.RSA) or a Campbell Scientific data logger raw data file (.DAT) can be loaded into verification tool for analysis instead of being directly connected to the instrument. This is described in more detail in Step 3 below.
Step 2 - Launch the SAAV Installation Verification Tool
Once your computer and SAARecorder are connected to the SAAV, you need to launch the SAAV Installation Verification tool from the Diagnostics menu in SAARecorder.
Figure 2: The SAAV Installation Verification tool is launched from the Diagnostics menu in SAARecorder
Step 3 - Input the Casing's Inner Diameter
In the SAAV Installation Verification window, if you are directly connected to the SAAV, ensure the Live Data option is selected. Alternatively, if you wish to analyze data saved in a raw data file (.RSA or .DAT), then select the Recorded Data option and click the Browse button to select the raw data file. Once your data source is selected, enter the inner diameter of the casing into which the SAAV is being installed in the Casing Inner Diameter field. For standard inclinometer casings we would expect inner diameter values similar to the following.
- 70 mm outer diameter - 59 mm inner diameter
- 85 mm outer diameter - 73 mm inner diameter
Figure 3: The casing's inner diameter must be entered into the Casing Inner Diameter field
NOTE: The Casing Inner Diameter value will need to be entered in millimetres or inches depending on SAARecorder's units setting. The units setting can be changed by selecting the SAA Setup | Units menu option.
Step 4 - Determine Whether the SAAV Has Achieved the Proper Cyclical Shape
As the SAAV takes on a cyclical shape within the casing, it will compress. The amount of compression in the instrument will determine how close the instrument is to the ideal cyclical shape within the casing. Pumping the SAAV by lifting it an appropriate height and dropping back into the casing to achieve an appropriate amount of compression will reduce the amount of settlement expected after installation.
Once the SAAV is resting on the bottom of the borehole and you are connected to it with SAARecorder, lift the ShapeArray until it is hanging in the casing with one segment touching the bottom. When the last segment is resting on the bottom of the casing, the angle reported by the SAAV Installation Verification tool will be around 4° to 6°. The tilts of the segments above the last segment should be close to 0°. If there are bends in the borehole, the angle will increase to 1° or 2°. You should see a graph similar to what is shown in the figure above in the SAAV Installation Verification tool when the instrument has been lifted sufficiently.
Once you have lifted the SAAV enough to have only the last segment resting on the bottom of the casing, drop the ShapeArray such that it falls straight into the casing. The array will drop into the hole with some friction from the joints resisting the movement. Manually apply some downward pressure to the SAAV (approximately 5 lbs) in order to compress it within the conduit, record the value for Compression reported in the SAAV Installation Verification tool, and collect sample data from SAARecorder.
The SAAV should be lifted and dropped repeatedly in this manner until three sequential readings of Compression do not change by more than 1 mm. This should take approximately 10 to 15 lift and drops (pumps).
NOTE: Save the recorded data files and details about the number of lift and drops were required to achieve proper compression. These files and details could be helpful in troubleshooting any issues encountered in the future.
Once this is done, you will be ready to measure the azimuth offset for the X-mark.