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Changing the Range/Span of a SITRANS P300

You're right, adjusting the range of a SITRANS P300 typically involves a characteristic curve. Here's a breakdown of how to approach this, addressing both PROFIBUS and local display methods:

Via PROFIBUS

The manual accurately states that creating a characteristic curve is generally done via PROFIBUS communication. This involves using a configuration tool (like Siemens PDM or similar) to upload a custom curve into the transmitter. Unfortunately, detailed step-by-step instructions are highly dependent on your specific configuration tool and PROFIBUS setup. Refer to the SITRANS P300 PROFIBUS interface manual for detailed procedure.

Via Local Display (Limited)

Changing the range directly via the local display is **limited**. You can adjust the zero and span, but this won’t create a completely new characteristic curve. This might get you closer to your desired 0-250mb range, but accuracy may be compromised if the change is substantial.

Step-by-Step for Zero & Span Adjustment (Local Display):

1. Enter Parameter Mode. (Refer to the P300 basic setup manual for this – usually involves pressing a button combination).
2. Navigate to the Zero Point parameter.
3. Adjust the zero point to correspond to 0mb.
4. Navigate to the Span parameter.
5. Adjust the span to correspond to 250mb.
6. Important: After adjustment, carefully verify the accuracy across the entire 0-250mb range.

Recommendation: For a precise 0-250mb range, using the PROFIBUS interface and a custom characteristic curve is strongly recommended. If you don't have PROFIBUS access, consider contacting Siemens Service for assistance.