8 Steps to Measure the Relative Humidity in Concrete According to the ASTM Standard

Practical advice for measuring humidity

The most common source of error when measuring relative humidity is a difference between the temperature of the probe and the temperature of the environment. At a humidity condition of 50 % RH, a temperature difference of 1 °C (1.8 °F) typically results in an error of 3 % RH on relative humidity.

It is good practice to monitor the display of the moisture meter for temperature stability. The probe should be given sufficient time to come to equilibrium with the environment to be measured. The larger the initial temperature difference between the probe and the environment, the more time is required for temperature equilibrium.

In extreme situations, condensation may occur on the sensors when the probe is colder than the environment. As long as the humidity / temperature limits of the humidity sensor are not exceeded, condensation does not alter the calibration of the sensor. However, the sensor has to dry out before it can provide a valid measurement.

Step 1: Check the correct functionality of the instrument and probe using the humidity standard tube.

Step 2: Concrete floor slab and air space surroundings must be at service temperature / humidity for at least 48 hours.

Step 3: Define numbers of test holes

Step 4: Define depth of test holes

Step 5: Drill and prepare test holes

Step 6: Wait 72 hours for moisture equilibrium

Step 7: Measure

o Insert in-situ probe into sleeve

o Wait for temperature equilibrium

o Check for stable values

Step 8: Report all necessary information

To find out more about Proceq's moisture meter visit us at http://www.proceq.com/en/non-destructive-test-equipment/concrete-testing/moisture-corrosion-analysis/hygropin.html?pqr=2
Proceq SA of Switzerland, founded in 1954, is the leading manufacturer of high quality portable test equipment for concrete properties, metal hardness and paper hardness applications. The company's strong research and development team continues to create products that set industry standards for portable test equipment.
The moisture meter Hygropin offers the perfect solution to identify and monitor moisture in concrete. Due to its small, fast sensor, diagnosing moisture according to the ASTM standard is quicker and easier than ever before.

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