PosiTector CMM IS Web Manual

PosiTector CMM IS®
Instruction Manual v.1.0
HTML (Web) Version


The PosiTector CMM IS concrete moisture meter measures the relative humidity and temperature in concrete slabs using in situ probes, prior to the application of flooring materials or coatings.

When applying flooring materials or coatings to concrete, it is critical to ensure that the moisture level inside the concrete has decreased to acceptable levels. If not, moisture can accumulate below the flooring or coating, causing discoloration, cupping, buckling, blistering, adhesive failure and mold growth.

Designed in accordance with ASTM F2170, the PosiTector CMM IS provides a complete measurement solution for monitoring the drying process of concrete slabs in compliance with industry standards. The unique design of the PosiTector CMM IS probes allow the user to place them into concrete immediately after the holes are drilled and leave them in place until they reach equilibrium, eliminating the need to reopen the hole at a later date.

PosiTector CMM IS probes broadcast measurements to the PosiTector App or PosiTector Advanced instruments using Bluetooth wireless technology.

The PosiTector CMM IS is available in 3 kit configurations: Basic, Complete and Professional.

Expansion Packs

PosiTector CMM IS Expansion Packs are available when additional probes are required. A single expansion pack consists of the following

  • PosiTector CMM IS probe
  • Calibration Check Chamber
  • Saturated Salt Solution (NaCl)
  • Cap
  • (2) A-76 / LR-33 batteries

NOTE: For instructions on how to use the PosiTector CMM IS and the PosiTector App in accordance with ASTM F2170, refer to Setting Up a New ASTM F2170 Project.

Quick Start

PosiTector CMM IS probes are designed for use with the PosiTector App or a PosiTector Advanced Gage.

Power-up PosiTector CMM IS probes by unscrewing the battery cover and inserting the battery (positive “+” facing up). Replace the battery cover. The probe will begin broadcasting and is now visible to the PosiTector App and PosiTector Advanced instruments.

To power down the PosiTector CMM IS probe, unscrew battery cover and remove battery using a pointed tool, such as the probe extraction tool.

Viewing Readings from PosiTector CMM IS probes

PosiTector CMM IS measurement values can be viewed using the PosiTector App or a PosiTector Advanced instrument. To record measurement values, see How to Measure.

Using PosiTector App:

Install the PosiTector App from the App Store (Apple iOS) or Google Play (Android).

Open the PosiTector App. Available probes within 10 m (30 feet) will appear as "CMMIS" with the corresponding serial number, as shown below:

NOTE: The PosiTector App will also display any PosiTector Advanced instruments within range (as shown above)

The small circle icons to the left of each PosiTector CMM IS probe display the most recent Relative Humidity reading. This value is updated every five minutes.

To view measurements from the PosiTector CMM IS probe, select it from the search screen. Once connected, a blue light is emitted from the bottom of the probe and values are updated every five seconds and displayed as shown to the right. The battery indicator in the top left corner shows the battery level of the PosiTector CMM IS probe.

Using a PosiTector Advanced:

To view available probes, select Bluetooth Smart from the gage's Connect menu. Then select Smart Probes (shown below).

Available probes within 10 m (30 feet) will appear as "CMMIS" with the corresponding serial number and latest relative humidty reading, as shown below:

Select a probe to display its Relative Humidity and Temperature values. Once connected, a blue light is emitted from the bottom of the probe and values are updated every five seconds.

NOTE: When a PosiTector DPM environmental probe is attached to the PosiTector body, PosiTector CMM IS measurement data can be recorded into the gage's memory. When any other probe is attached, such as a PosiTector 6000 probe, PosiTector CMM IS readings can be viewed only.

Calibration & Verification of Accuracy


Calibration is typically performed by the manufacturer or a qualified lab. All PosiTector CMM IS probes include a Certificate of Calibration. In accordance with ASTM F2170, probes must be recalibrated annually. DeFelsko recommends beginning the calibration interval from either the date of calibration, date of purchase, or date of receipt.

Verification of Accuracy

It is recommended that PosiTector CMM IS probes be stored within the Calibration Check Chamber when not in use. The Calibration Check Chamber and Saturated Salt Solution are designed in accordance with ASTM E104 to maintain a constant relative humidity. Per ASTM F2170, the Calibration Check Chamber and Saturated Salt Solution maintain a constant relative humidity of 75% (at 25° C) and keeps the probe in a ready-to-use condition.

ASTM F2170 requires calibration to be verified within 30 days prior to use. Power-up the probe by inserting a battery, positive (+) side up. Probe calibration is verified by inserting a probe into the Calibration Check Chamber, connecting to either the PosiTector App or a PosiTector Advanced gage body and taking a measurement (after allowing the probe at least 1 hour to acclimate to the present environment). Probes should report a relative humidity within 2% of the humidity value listed in Table 1 for the corresponding temperature. To simplify the verification process, we recommend using the Cal Check function of the PosiTector App or PosiTector Advanced. The Cal Check function automatically determines whether a probe is reading within tolerance.

Probes should be allowed to acclimate for at least 24 hours within the Calibration Check Chamber and Soluble Salt Solution before calibration is checked.

It is important to maintain a constant temperature within the Calibration Check Chamber. Relative humidity variation due to temperature fluctuation for the Calibration Check Chamber is shown in Table 1.

Table 1
Extracted from Table A1.1, Equilibrium Relative Humidity Values for Selected Saturated Aqueous Salt (ASTM E104)

t °C t °F Sodium Chloride (RH%)
5 41 75.7 ± 0.3
10 50 75.7 ± 0.3
15 59 75.6 ± 0.2
20 68 75.5 ± 0.2
25 77 75.3 ± 0.2
30 86 75.1 ± 0.2
35 95 74.9 ± 0.2
40 104 74.7 ± 0.2
45 113 74.5 ± 0.2

Example Tolerance Calculation:

At 25° C, the Soluble Salt Solution relative humidity range is 75.3% ± 0.2. Including the ±2% relative humidity tolerance specified in ASTM F2170, a probe would be considered to be in tolerance if it measured between 73.1 – 77.5 %.

NOTE: When the Saturated Salt Solution (Boveda) is completely dry, it will solidify. They should be replaced while there is still moisture present and before they are completely solid.

How to Measure (in accordance with ASTM F2170)

PosiTector CMM IS probes, coupled with the PosiTector App or PosiTector DPM Advanced simplify the process of viewing, recording and reporting in accordance with ASTM F2170.

Step 1. Evaluate the location to determine how many tests must be performed.

ASTM F2170 specifies that 3 tests must be performed for the first 100 m2 (1000 ft2) of concrete and one additional test for each 100 m2 (1000 ft2) of concrete. One test must be performed within 3 ft. (1 m) of each exterior wall.

Step 1b (if using the PosiTector App). The PosiTector App makes it easy to view, record and report in accordance with ASTM F2170. The app is available within the App Store (Apple iOS) and Google play (Android).

Open the PosiTector App and select F2170 from the top menu bar. Next, select New Project and enter the job details.

A PosiTector DPM Advanced instrument or spare PosiTector CMM IS probe can be used to record ambient temperature as required by ASTM F2170. Under Ambient Instrument, select an available PosiTector CMM IS probe or input data manually from a PosiTector DPM. To enable broadcasting, ensure the PosiTector Advanced is powered on (Bluetooth Smart enabled) or the battery in the PosiTector CMM IS probe is installed.

Select Ok to save the project.

Step 1c (PosiTector App only). If desired, insert a picture or blueprint of the area to be measured. Use the to take a photo of the blueprint, or use the to insert an image from the photo gallery. This background image will make it easy to locate each probe within the area.

Step 1d (PosiTector App only). Press the (+) icon at the bottom right of the Project screen and then touch the screen in the desired location to place the hole. The new hole location will be overlayed on the image and will be identified as a circle containing --- 0. Repeat this for each measurement location within the Area. Create additional Areas as required.

Step 2 - Drill the Hole

ASTM F2170 sets out strict requirements for hole depth and diameter. Using a rotary hammer drill with a carbide-tipped masonry drill bit (3⁄4” diameter), drill the hole to the required depth. Do not use water for cooling or lubrication.

Hole depth requirements according to ASTM F2170:

  • Concrete slab drying from one side only: 40% depth from top of slab
  • Concrete slab drying from two sides: 20% depth from the top of the slab

Step 3 - Clean and Inspect the Hole

Ensure any dust and debris are removed from the hole. The vacuum attachment included with the Complete Kit and Pro Kit is ideal for this purpose. It can also be purchased separately from your dealer.

Per ASTM F2170, check the diameter and depth of the hole using the included tape measure. If either dimension is incorrect, the hole must be re-drilled and cleaned. Incorrect hole diameter may cause difficulty inserting or removing a PosiTector CMM IS probe.

If using the PosiTector App, touch the circle corresponding to the hole, and record the location, depth and date/time the hole was drilled. Select Set Now to input the current time and date, or input it manually.

Step 4 - Insert the Probe

PosiTector CMM IS probes are designed to be placed into the hole as soon as the hole has been prepared. Remove the probe from the Calibration Check Chamber and Saturated Salt Solution, unscrew the battery cover and insert the battery, (+) positive side up. Replace the cover.

The probe will immediately begin broadcasting readings via Bluetooth, and can be viewed from the PosiTector App or a PosiTector Advanced.

Once powered-up and operational, insert and push the probe completely to the bottom of the hole. Cover the hole using the included yellow plastic cap. Per ASTM F2170, the probe must remain in the hole for 72 hours to achieve moisture equilibrium before measurements are recorded.

If using the PosiTector App, touch the circle corresponding to the hole, and select the serial number of the inserted probe to associate that probe with the hole.

Record the date and time each probe is inserted by selecting Set Now to automatically set the current time and date, or input it manually.

NOTE: A new battery will continuously power the probe for up to 3 weeks.

Step 5 - Record Measurements

ASTM F2170 requires waiting 72 hours, before probe measurements are recorded. There is no need to remove the yellow cap or to access the probes in the holes. The probes remain powered-on and broadcasting while in situ.

To Record Measurements Using the PosiTector App:

  1. Open the PosiTector App and select F2170 from the top menu bar.
  2. Open the associated Project.
  3. Record measurements for each hole in the project:
    To record probe measurements, touch the circle corresponding to the hole and touch the Measure button to record the Relative Humidity and Temperature within the corresponding hole.

Ambient Relative Humidity and Air Temperature (above the hole) can be recorded using a spare PosiTector CMM IS probe or PosiTector DPM Advanced instrument. The ambient instrument being used is specified within the Project setup. Select Measure, and then Ok to store the displayed values. Alternately, a relative humidity and temperature value can be entered manually.

Repeat Step 3 for each hole in the project. Once readings have been recorded for all holes in the project, professional reports can be generated that conform to ASTM F2170. Select REPORT from within the Project to automatically generate the report.

NOTE: More detailed instructions on using the PosiTector App is available in the Help File, located at www.defelsko.com/app-help

To Record Measurements Using a PosiTector DPM Advanced:

  1. Access the Connect Menu within the gage menu.
  2. Under Bluetooth Smart, select Smart Probes (shown below). Available PosiTector CMM IS probes will be visible. Select the probe to be recorded.
  3. The relative humidity and temperature measured by the PosiTector CMM IS probe will be displayed below the ambient relative humidity, air temperature and surface temperature measured by the PosiTector DPM probe, as shown below:

To record, ensure a batch is open in memory and press the (+) button on the gage. The displayed readings of the PosiTector DPM probe and the PosiTector CMM IS probe will be recorded into the gage’s memory. If a batch is not currently open, select New Batch from the gage’s Memory menu. To add measurements to an existing batch, select Open from the gage’s Memory menu.

Measurements from multiple PosiTector CMM IS probes can be recorded within the same batch by repeating the above steps for each probe in the project.

NOTE: If any probe other than the PosiTector DPM probe is attached to the PosiTector Advanced body while connected to a PosiTector CMM IS probe, the gage body will ignore the attached probe and only display the PosiTector CMM IS measurements.

Recorded measurement values can be reported using PosiSoft Solutions. See the PosiTector DPM Instruction Manual for more information.

Step 6 - Remove the PosiTector CMM IS Probes

The PosiTector CMM IS probes are designed to be reusable. Once measurements are complete, use the extraction tool to remove the probes from the holes. Clean any visible debris or concrete dust from the probes and inspect the silicone fins. If the silicone fins are damaged or worn, they should be replaced. If no further tests are required, remove the batteries by unscrewing the battery covers and pushing the battery out using the probe extraction tool and place each probe into a Calibration Check Chambers for storage.

Once testing is complete, the holes should be filled with a cementitious patching compound in accordance with ASTM F2170.


The PosiTector CMM IS Probe does not appear in the PosiTector App or in the PosiTector Advanced Gage Body after the battery is inserted
Check the battery in the probe and replace if required. Ensure Bluetooth is enabled on the Smart device running the PosiTector App or Bluetooth Smart within the PosiTector body.

RH value is slow to stabilize
If the probe is exposed to very low humidity for an extended time period and then placed in a high humidity environment, the displayed Relative Humidity (RH) may appear to respond slowly. Allow the probe to stabilize at least 60 minutes for a change of RH greater than 50%. When placed into the Calibration Check Chamber, allow at least 24 hours for the relative humidity to stabilize.

Returning for Service

For issues related to the PosiTector CMM IS probes:

  1. Install new batteries in the proper alignment as shown within battery compartment.
  2. Examine the sensor for debris or damage.
  3. Re-attempt measurement.

For issues related to the PosiTector Advanced Gage Body:

  1. Perform a Hard Reset as follows:
    A. Power down the Gage and wait 5 seconds.
    B. Simultaneously press and hold the (+) and center buttons until the Reset symbol appears.
    This returns the Gage to a known, "out-of-box" condition.
    WARNING: All readings in memory will be erased.
  2. Update your PosiTector gage body and re-attempt measurements.

If these steps do not resolve the issue, visit our Service & Support page for information on sending your Gage to us for a no charge evaluation. See: http://www.defelsko.com/service

For issues related to the PosiTector App, please refer to the Help File located at: www.defelsko.com/app-help

Limited Warranty, Sole Remedy and Limited Liability

DeFelsko's sole warranty, remedy, and liability are the express limited warranty, remedy, and limited liability that are set forth on its website: www.defelsko.com/terms

The Measure of Quality

This manual is copyrighted with all rights reserved and may not be reproduced or transmitted, in whole or part, by any means, without written permission from DeFelsko Corporation.

DeFelsko and PosiTector are trademarks of DeFelsko Corporation registered in the U.S. and in other countries. Other brand or product names are trademarks or registered trademarks of their respective holders.

Every effort has been made to ensure that the information in this manual is accurate. DeFelsko is not responsible for printing or clerical errors.

© 2018 DeFelsko Corporation. ALL RIGHTS RESERVED.