Is this compatible with the Pimoroni MICS6814 breakout?

[precociousmouse]

I'm currently connecting to the breakout with this lib on I2C address 0x19, and reporting the firmware back correctly (1), but any requests for gas levels using measureCO() or measureNO2() for example always return -1.00.

I am powering up the heater and waiting 3 mins before I run a check on that data but no luck.