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Using ADS1115 (or any other external ADC), how its possible to read zero instead of random floating values while no any signal at the ADC's input pin?

The ADS1115 is driven by an op-amp buffer as follows. [![enter image description here][1]][1]

The op-amp's + input is sometimes connected to a pH sensor, sometimes left unconnected. [1]: https://i.sstatic.net/8SfCt.gif

Using ADS1115 (or any other external ADC), how its possible to read zero instead of random floating values while no any signal at the ADC's input pin?

The ADS1115 is driven by an op-amp buffer as follows.

The op-amp's + input is sometimes connected to a pH sensor, sometimes left unconnected.

Using ADS1115 (or any other external ADC), how its possible to read zero instead of random floating values while no any signal at the ADC's input pin?

Using ADS1115 (or any other external ADC), how its possible to read zero instead of random floating values while no any signal at the ADC's input pin?

The ADS1115 is driven by an op-amp buffer as follows. [![enter image description here][1]][1]

The op-amp's + input is sometimes connected to a pH sensor, sometimes left unconnected. [1]: https://i.sstatic.net/8SfCt.gif

Using ADS1115 (or any other external ADC), how its possible to read zero instead of fluctuating values while no any signal at the ADC's input pin?

Using ADS1115 (or any other external ADC), how its possible to read zero instead of random floating values while no any signal at the ADC's input pin?