Specifications

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EVERYTHING YOU NEED TO CONDUCT
MULTIPLE SAMPLINGS
Vaisalas HM 44 set is the ideal solution for measur-
ing humidity in structures such as concrete. The kit
includes the following parts:
 HMI 41 indicator with batteries
 HMP 44 RH & T probes
 Protective cover with lid, 3 pcs (19268HM)
 Rubber plugs, 12 pcs (19267HM)
 Plastic sleeves, 12 pcs (19266HM)
 Carrying case
TOO MUCH WATER IN STRUCTURES MEANS
TROUBLE
Reducing the water content of concrete, or other
materials, during construction work is an essential
part of the building process. The same applies to
drying out buildings after water damage.
The materials used should be dried just right 
enough, but not too much. Excessive drying wastes
both energy and precious time. On the other hand,
too short a drying time may cause problems later on:
floor coverings start swelling or bending, or adhe-
sives break down, or mold begins to grow. To save
time and money, a reliable and accurate method of
measuring the optimum drying of the construction
materials is needed.
HM 44
HM 44 Concrete Humidity Measurement
System
A RELIABLE METHOD FOR MEASURING
HUMIDITY IN STRUCTURES
Measuring relative humidity in a structural material
such as concrete is a clear indication of whether the
material is dry enough.
The HM 44 kit is ideal for measuring humidity in
concrete. First, a hole is bored at the required depth,
cleaned out, and a plastic sleeve inserted. At this
point, the probe can be pushed into the sleeve and
sealed. The material at the bottom of the hole
releases humidity into the space around the probe
until equilibrium is reached. The HMI 41 meter can
then be connected to the probe cable and a reading
taken. Alternatively, the sleeve can be plugged after
insertion. When the humidity in the hole has reached
equilibrium, the probe is inserted and left to stabilize
for a short time before a reading is taken.
The supplied cover protects the probe on the con-
struction site, and against the effects of the ambient
conditions. Concrete dries unevenly and is usually
drier on the surface. A surface measurement alone
may give misleading information. The sleeve enables
measurements to be made at the correct depth to
give a true picture of the humidity in the concrete.