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.

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 indicator showing a Poor (red light) or Good (green light) rating. 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 until the average tilt rating indicates Good (green light). 

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 of Good.

Figure 3: SAAV Installation Verification window with a Good Average Tilt Quality rating for 50 m SAAV pumped 21 times