Insulation alarm is described in detail in the manuals of the B camera models. For building inspections, a B camera is assumed. Please see attached excerpt.
Summary: "Insulation level" can be considered a "comfort factor". You enter a desired value, outdoor and indoor temperature. (Tout < Tin). In the camera, a formula is used to find the surface temperature on the inside of a wall that corresponds to the insulation factor, and an "isotherm below" is set at this temperature. Areas where the surface temperature is lower than desired are highlighted. The formula:
Tsi = f(Ti - Te) + Te
f = the insulation factor. Common values in litterature are 0.6 - 0.8.
Tsi = internal surface temperature
Ti = internal air temperature
Te = external air temperature
File Attachment(s)
Insulation alarm from T559059_a326.pdf (219.96 KB)