I have got a prototype made with ADS1219 with below circuit. I have tried to use TI op amps but due to non-availability I used MCP6V02. I am getting the same readings on the ADC1219 with or without the gas sensor. The gas sensor is connected to AIN1. Please help me resolve this.
AIN0: 1.02438 | AIN1: 1.02438 | AIN2: 1.02438 | AIN3: 1.02438
Please click link to see schematic