Protimeter INS9800, Инструкция по эксплуатации, Страница: 29 / 34

INS9800 24
MMS3 Instruction Manual
Item 3: Two hygroscopic salts, chlorides and nitrates,
may build up on the surface of walls where rising
dampness or wicking occurs. As groundwater moves
through the wall and migrates to the surface, salts tend
to accumulate where the rate of evaporation of this
t i t t Th lt th l
When high subsurface relative readings are obtained in
the Search mode, the user is strongly recommended
to quantify these values in
%WME
terms by using the
deep wall probes in the Measure mode. If the depth of
clearance holes is increased incrementally by a
nominal 0.4 in. (10 mm) at a time, the moisture profile
through the wall can be established.
Item 2 : Condensation related moisture problems are
common. When assessing the risk of condensation, or
confirming its existence, the proximity of the actual
temperature of the surface under investigation to the
dew point must be established. The TDIFF
measurement in CONDENSATOR mode tells the user
how many degrees the temperature of a surface is
above or below the dew point.
As many condensation situations are transient, TDIFF
readings should be taken in a methodical and regular
manner, similar to moisture meter readings in materials.
Ambient RH and temperature values should also be
taken to assess the moisture condition of the room as a
whole. Dwellings and working environments generally
have an RH from 40% to 60%, so there may be cause
to investigate environments that register RH values
outside this range.