Convert PSI Pressure Output to Level Output in Feet in iChart

The Seametrics PT-12 Submersible Pressure Sensor records the pressure exerted on its internal diaphragm from the surrounding environment and can convert this signal into a level measurement. The X2 data logger script has a built-in conversion factor that outputs the data in both pressure (PSI) and level (ft.) However, for the iSIC and iSIC-V2 data logger, a command must be sent within iChart to input this conversion factor and output level data, in feet, instead of the pressure data in PSI.

 

SDI-12 Commands

1. Open iChart
2. Go to Advanced | iSIC | iSIC to connect to the data logger.

 

 

3. Click the SDI-12 tab.

 

 

4. Send ?! to ensure the sensor is connected and can communicate through SDI-12.
   • An acknowledgment (ACK:) should display along with the sensor address.

 

5. Input the following command to have the pressure output in PSI converted to level in feet, and then click Send.
   • aXC16=2.31!
   • a corresponds to the SDI-12 address of the sensor, which can be found by following the previous step.

 

 

6. Send the following command to set a level offset of zero.
   • aXC17=0.0!

 

 

7. Add the PT12 as a Generic|SDI-12 sensor in iChart with the attached settings and program the logger.
   1. Note: Match the SDI-12 address of your PT-12 in the smart sensor setup.