Structural Humidity Measurement

HMP40S RH&T probe with a cable
HM40 indicator with a quick connection adapter
12 pcs rubber plugs (233976)
Calibration certificate (ISO9001 compliant, NIST traceable)
12 pcs plastic tubes (19266HM)
Weather-proof carrying case with a shoulder strap

The Vaisala SHM40 offers an easy and reliable solution for humidity measurements in concrete and other structures using the borehole method. In this method, a humidity probe is left in the borehole until the humidity in the hole has reached an equilibrium state and the stabilized values can be read.

The interchangeable HMP40S probes connect easily to the HM40 indicator with a snap-on connector enabling convenient use of multiple probes with one indicator. The measurement data can be displayed in numeric, graphic or statistic views. The rugged HMP40S probes are IP65 classified and conform to the ASTM standard F2170-09.

SHM40 kit is designed for measuring humidity in concrete using the borehole method . In the borehole method, a hole is drilled to a suitable depth in the concrete structure to be measured. After the drilling, the hole is cleaned and covered, and air humid ity in the hole is allowed to equalize with the humidity in the concrete. The airspace humidity will reach humidity equilibrium with the c oncrete in about three days. After this, the humidity measurement is made.

Contents of the SHM40 Kit

1. Pocket for documents and accessories
2. HM40 indicator with quick connection adapter (1 pc, HM40SINDI)
3. HMP40S humidity and temperature probe (1 pc, HMP40S)
4. Plastic tubes: 17.4 mm, length 120 mm (12 pcs, 19266HM)
5. Rubber plugs: 13 mm, length 21 mm (12 pcs, 233976)
6. Protective covers with lid: 64 mm, length 101 mm  (3 pcs, 19268HM)
7. Long rubber plugs for fresh concrete (12 pcs, 26530HM)
8. Plastic flanges for fresh concrete (12 pcs, 26529HM)

Performing the Measurement

1. If the probe has not been left to stabilize inside the tube:
   1. Remove the rubber plug from the tube.
   2. Insert the HMP40S probe in the tube.
   3. Seal the tube with the rubber plug on the cable.
2. Connect the probe to the HM40 indicator.
3. Turn on the HM40 indicator.
4. Switch to RH quantity.
5. Switch to graph view and verify that the readings are stable. If you inserted the probe in step 1, wait for at least 30 minutes before continuing to the next step.
6. Write down the measured RH value. You can also press the Hold button tag the point.
7. Turn off the HM40 and disconnect the cable.
8. If you do not wish to leave the probe into the tube, remove the probe and close the tube with the rubber plug

Using the HM40 Indicator

1. Quick connection adapter for HMP40S probe
2. Display
3. Right function button
4. Up arrow button
5. Power button
6. Left function button
7. Down arrow button
8. Menu button

Easy Measurement with Multiple HMP40S Probe And Quick Connector

The HMP40S measurement probes are interchangeable. The probes connect easily to the HM40 indicator with a snap-on connector enabling convenient use of multiple probes with one indicator. The measurement data can be displayed in numeric, statistic or graph views.