I think that i understand what I did wrong. I was waiting until almost the end of the burn period when the stove was starting to lose it's heat. Then I started poking & disturbing the bed too much. I'll try to get too it a little earlier in the burn and take it a little easier on the poking/shaking.
I did find and set up that security camera that i now hace focused on my digital aquastat. I can now monitor the water temp. on my living room tv without running down the basement. When I first hooked it up the picture was perfect but the temperature did not show up on the tv screen!
The camera has infrared LEDs for night vision but the temp. display was red and was invisable to the camera. I had to put a shield on the front of the camera to block out the infrared.