I have a Bacharach Mod 60 meter. Recently we did a test on a furnace
that went to 3,800 + ppm CO , after removing the probe I let the meter
run for at least 3 minutes and it would not go below 50 ppm. I took
the meter outside and turned it back on. It then went to 0. I then
tried retesting and the CO wet up quickly to 800+ so I stopped the
I then tested the Wolf range top readings such as 12, 54, 10, 176
ppm. When I tested the griddle it again wet to over 3,800 ppm CO and
the meter would not go to zero when I removed the probe from the
exhaust port. Again I took the meter outside to restart and it did go
to 0. I then started to recheck the griddle and it also climbed very
fast so I aborted the test. Next was the oven, the left side was over
700 and the right about 650 ppm. The meter did go to 0 after the oven
What I was concerned about was damaging the meter. The instructions
indicate it will measure 2,000 ppm and calculate up to 9,999 ppm. It
also indicated running the meter for 10 minutes before turning off.
Any insight or advice? The only thing I can see that I did
incorrectly was not wait 10 minutes before turning the meter off.
Does anyone have any good sources on the relationship of CO, O2, CO2,
stack temp etc?
Any recommendations on a class on how to tune and clean ovens and
And yes the customer was advised to immediately get his furnace, range
top, griddle and over serviced before using.