According to the datasheet, there should be a DIP switch for output voltage adjustment for Veris CO sensor. But some of them haven't such DIP switch.
There are several models for Veris CO sensor. For example, GWVAS is the wall mount sensor with voltage output signal, while GDMAS is the duct mount sensor with current output signal. The sensor with current output signal hasn't such DIP switch for voltage output.
This model of product hasn't such DIP switch.