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Email: [email protected]
HM44 Concrete Humidity Measurement System
• Meets the new ASTM standard
The Vaisala HUMICAP® Structural
Humidity Measurement Kit HM44
is the ideal solution for measuring
humidity in concrete. The HM44
includes the following parts:
• HMI41 Indicator with batteries
• HMP44 RH & T Probes
• Protective cover with lid, 3 pcs
• Rubber plugs, 12 pcs (19267HM)
• Plastic tube set, 12 pcs (19266HM)
• Carrying case
• NIST traceable (certificate included
The Vaisala HUMICAP® Structural Humidity Measurement Kit HM44 provides an easy and
reliable solution for humidity measurements in structural material.
Excess moisture in structures can
cause problems and economical losses.
In new construction, the tight time
schedule may not allow enough time
for structures to dry completely. Later,
excess moisture can cause surface
deterioration, room air impurities, and
in severe cases – mold. These problems
often lead to expensive repairs.
Moisture measurement
saves time and money
Measuring the moisture ensures that
the structure is dry enough before
starting the next construction phase.
Accurate moisture measurement
optimizes the construction schedule
and decreases the probability of future
repairs while the project is under
warranty and beyond. In renovations,
accurate moisture measurement
helps detect the actual source of the
moisture and the scope of the damage.
Reliable bore-hole method
Measuring relative humidity in a
structural material such as concrete
is a clear indication of whether the
material is dry enough.
The Vaisala HUMICAP® Structural
Humidity Measurement Kit HM44
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 Vaisala
HUMICAP® Humidity Indicator
HMI41 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 construction site and against the
effects of the ambient conditions.
Accessories needed for wet concrete
• Plastic tube set, 12 pcs (19266HM)
• Plastic flange set, 12 pcs (26529HM)
• Long rubber plug set, 12 pcs
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, thus giving a true
picture of the humidity in the concrete.
Measures in fresh concrete
The HM44 also measures humidity
in fresh concrete. The advantage
being that you do not have to drill the
concrete. The sleeves are easily and
quickly installed in the fresh concrete.
When floor heating elements/water
tubing are used, the measurements can
be done without breaking the pipes.
Meets the ASTM standard
Both methods, drilling into hardened
concrete and pre-installation into
wet concrete, meet the new ASTM
standard, "F2170-02 Standard Test
Method for Determining Relative
Humidity in concrete Floor Slabs Using
in situ probes."
Vaisala Instruments Catalog 2007
Ref. B210641en rev. A
Technical Data
HMP44 probe
Accessories needed for wet concrete
Relative humidity
Measurement range
0...90 %RH
90...100 %RH
Typical long-term stability in air
0...100 %RH
Response time (90%) at +20 °C in still air
Typical response time when the concrete
and the probe are in the same temperature
(stabilized hole)
Humidity sensor
Measurement range
Accuracy at +20 0C
Temperature sensor
±2 %RH
±3 %RH
better than
1 %RH/year
30 min
Plastic tube set, 12 pcs.
Plastic flange set, 12 pcs.
Long rubber plug set, 12 pcs.
Installation of the HM44 kit
Connector for the HMI41 indicator
-20...+60 °C (-40…+140°F)
±0.4 °C (±0.72 °F)
Pt 1000 IEC 751 1/3 Class B
Operating temperature range for electronics
Sensor diameter
Cable length
Probe length
Housing material
Housing classification
Sensor protection
Bore hole diameter
Measurement depth
-40...+60 °C
(-40…+140 °F)
12 mm
0.3 m
69 mm
ABS plastic
membrane filter 17039HM
16 mm
min. 30 mm, max. 90 m
Protective cover (19268HM)
Plastic sleeve is sealed with
a rubber plug (19267HM).
HMI41 indicator
Maximum error caused by the indicator at +20 °C (+68 °F)
±0.1 %RH
±0.1 °C (±0.18 °F)
Calculated quantities
dewpoint temperature,
absolute humidity,
wet bulb temperature,
mixing ratio
0.1 %RH/0.1 °C (0.1 °F)
Power supply
4 batteries, type IEC LR 6
Battery operation time
(alkaline batteries)
72 h continuous use
Operating temperature range
-20...+60 °C (-4…+140 °F)
Operating humidity range
0...100 %RH
Storage temperature range
-40...+70 °C -40…+158 °F)
two line LCD
Housing material
ABS plastic
Housing classification
(with connectors blocked)
Weight (incl. batteries)
300 g
Plastic sleeve (19266HM)
The humidity can be measured at
the desired depth (min. 30 mm,
max. 90 mm).
The tip of the probe is in contact
with the air that is in equilibrium
with the concrete.
Probe diameter 12 mm
Bore hole diameter 16 mm
Other probes to be used with the HMI41 indicator for the measurement of humidity in materials:
23.5 cm probe, diameter 4 mm
as HMP44 but with a 2.7 meter cable
320 mm tube of stainless steel, diameter 12 mm
Electromagnetic compatibility
Complies with EMC standard
EN61326-1, Portable Equipment
HUMICAP® is a registered trademark of Vaisala.
Specifications subject to change without prior notice.
© Vaisala Oyj
Vaisala Instruments Catalog 2007
Ref. B210641en rev. A
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