When no water level is showing on your boiler sight glass and you need to know if it's empty or full, there's one handy tool that can help you make that simple assessment.
You may have thought the No. 2 pencil was only helpful in grade school, but there is a simple test involving a No. 2 pencil that can help all facilities quickly determine whether a sight glass is empty or full when no water level is showing.
Hold a pencil against the far side of the sight glass at a 45 degree angle. If the image of the pencil viewed through the glass appears to run across the glass and changes no matter what the angle of the pencil, the glass is full.
If the image viewed through the glass runs up and down the glass at a sharper angle than the actual angle of the pencil, the glass is empty.
This procedure can be practiced with the normal water level by viewing through the sight glass above and below the water line. Although thick tubing can give a less pronounced difference, the difference will still be obvious.
If you need help from our service department determining whether your boilers are functioning properly, contact our service department with any issues you might have and we will get you in touch with one of our service technicians.