Small setback in chez Nofossil last night - my draft sensor seems to have died.
The sensor is (was?) wonderfully sensitive. You could register a big change just by blowing at it. It's rated for a max pressure of just under 1 psi.
I connected it to a port on my flue using a 12" x 1/8" brass pipe and a length of silicone tubing. Without a fire, it immediately jumped to a reading of .4" H20. I know that's wrong - the flue is definitely not at positive pressure compared to the room.
I removed the sensor, and it seemed fine. Reinserted it and started fire. Stayed with a steady reading of .4" until I removed it. It then gave me a series of unreasonable outputs, ending with it being stuck at about 1".
The long tubing should have protected it from any change of flue gas contamination, and the problem started before the fire was lit. I'm thinking it may have been mechanical stress on the sensor housing. I have a spare, and more testing will ensue.
The sensor is (was?) wonderfully sensitive. You could register a big change just by blowing at it. It's rated for a max pressure of just under 1 psi.
I connected it to a port on my flue using a 12" x 1/8" brass pipe and a length of silicone tubing. Without a fire, it immediately jumped to a reading of .4" H20. I know that's wrong - the flue is definitely not at positive pressure compared to the room.
I removed the sensor, and it seemed fine. Reinserted it and started fire. Stayed with a steady reading of .4" until I removed it. It then gave me a series of unreasonable outputs, ending with it being stuck at about 1".
The long tubing should have protected it from any change of flue gas contamination, and the problem started before the fire was lit. I'm thinking it may have been mechanical stress on the sensor housing. I have a spare, and more testing will ensue.
