How Do I Set My 4mA and 20mA Points in My Strapping Chart?
The TD100 T22 transmitter can send liquid level data to third-party systems through the standardized 4-20mA signal. The signal spans from 4 mA (0% level) to 20 mA (100% level) and is linear between the two points set in SensorLink. To ensure the most accurate output, your 4-20 mA settings should align with the specific tank levels on the strapping chart programmed in the transmitter — and in the third-party device, if applicable.
Procedure
Step-by-Step Configuration
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Connect the TD100 T22 to Your Computer
- Ensure the TD100 T22 is powered and connected to your computer using the programming kit wiring.
- Open the SensorLink software.
- For more information about wiring your transmitter for programming, see Configuration & Programming.
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Access the 4-20 mA Configuration Settings
- In SensorLink, click the "Set 4-20mA Points" button on the bottom left of the TD100 configuration page.
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Set the 4 mA and 20 mA Points
- By default, 4 mA corresponds to an empty tank and 20 mA to a full tank. To modify these settings, enter the depth at which you want the 4mA and 20mA points to occur, then press OK when finished.
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Align with the Third-Party Device's Strapping Chart (if applicable)
- For more precise readings, make sure the third-party device is also programmed with a strapping chart, or something similar, to match the TD100's configuration. This ensures the linear 4-20 mA signal translates accurately into volume or level data.
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Testing
- Test the output using the third-party system to confirm the calibration is correct.
Note: If you're unsure of the required settings, the factory defaults are typically fine for standard applications.