MQ-7 module(LM393+MQ=7)need to enlarge AOUT voltage?

Hi,everyone
I have a MQ-7 module(LM393+MQ-7)to detection CO gas.
And then the CO is in 330ppm environment
But I see the MQ-7's Aout Voltage is 0.303V
The voltage is so low.
It's right?
Can anyone tell me that your MQ-7 Aout Voltage?
Should I need to put a OP amp to enlarge Aout Voltage or what?