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.
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 SAAFPU
- Connecting to a PC using the SAAUSB
- Completing a Connection
NOTE: A pre-recorded raw data sample from SAARecorder (.RSA) or a Campbell Scientific data logger (.DAT) can be loaded into SAARecorder 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 1: 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, enter the inner diameter of the casing into which the SAAV is being installed in the Casing Inner Diameter field. 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.
Figure 2: 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.
Changing the Casing Inner Diameter value will determine the minimum average tilt value required for the SAAV to achieve the desired cyclical resting position. This is displayed as a dashed blue line in the Tilt Relative To Medial Axis graph at the top of the window.
Step 4 - Determine Whether the SAAV Has Achieved the Proper Cyclical Shape
The Average Tilt Quality indicator in the bottom right corner of the window displays the average tilt value relative to the medial axis in degrees for all segments and a quality rating from Poor to Good. This rating is determined by the proximity of the average tilt value to the minimum required average tilt value calculated in Step 3 above. The SAAV should be pumped as necessary to maximize the average tilt of the SAAV segments. Typically this should place the average tilt quality indicator in the green zone, to the right of vertical (the minimum required average tilt). Ideally, the Average Tilt Quality indicator should be in the green zone. If the indicator resides in the yellow or red zones, the SAAV should be lifted and pumped to settle it into place.
For example, the SAAV Installation Verification window shown in Figure 2 above presents data from a 50 m SAAV installed into 73 mm Inner Diameter (ID) casing before any pumping has occurred. The minimum required average tilt is 6.2 degree. The average tilt of the instrument's segments is 5.6 degree and the Average Tilt Quality indicator shows a rating of Poor. Figure 3 below shows the same installation after the SAAV has been pumped 21 times. This changed the average tilt angle to be 6.4 degrees and the Average Tilt Quality indicator shows a rating much closer to Good.
Figure 3: SAAV Installation Verification window with a Good Average Tilt Quality rating for 50 m SAAV pumped 21 times