I recently purchased a used Mars H-10G leak detector, manufacture date, October 1997.
The unit seems very interesting in that it uses high line voltage -- 120 VAC -- to power it. However, the darn thing is so sensitive. I come to find out that you need to have r11 refrigerant on hand for calibrating the device. Is this absolutely necessary? I know that r11 at atmospheric temperature is in a liquid form, and therefore, can be poured in the tiny calibration bottle that you get with the unit. But again, I am confused as to why this is necessary.
Also, there is a large-medium-small setting on there as well, which I assume is for different refrigerant types. It seems that once this unit goes off, it's difficult to get it to stop sounding the alarm. I do know that this unit is sensitive enough for 1/2 ounce loss per year, which to me is what I'd consider a very small leak.
It would be greatly appreciated if someone with extensive knowledge on this unit can come to my aid. Thanks again!