Envco – Environmental Equipment

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.

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."

Please read specification sheet and order guide prior to placing an order. Vaisala products are professional grade instruments and have options specific to your application. This information needs to be detailed.