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PGA300: PGA300 4-20mA reading increasingly drift

Part Number: PGA300

Hello:

I have designed pressure transmitter based on PGA300.

With 3P1T calibration, 4-20 mA reading is always stable, but with 3P3T or 4P4T, 4-20 mA reading has 0.1% FS increasing at 8 mA, 0.2% FS increasing at 12 mA and 0.3% FS increasing at 18 mA within 30 seconds, then turn stable.

Could you please help us to eliminate those kind increasing?

Thanks!

Ed