Quantifit Knowledge Base

International Customers: Please see Google Translate option at the bottom of this page.


This problem could include a number of variables, but most likely would fall into three categories: machine fault, adapter/mask fault, or subject/operator error. If it’s a one-time problem when you are able to pass other people, the answer simply may be that the mask is not a good fit on the subject. When several subjects can’t pass, you must look at the other variables. 

Machine Fault:

  1. You must do the daily calibration at the beginning of each day.
  2. If the Quantifit successfully completes the dual tube calibration without an error message, this assures that the machine is operating properly and within tolerance.
  3. If the Quantifit does not complete the dual tube calibration, service might be needed. Please contact OHD customer service. 

Mask/Fit Fault:

  1. You must first determine that there is a proper fit. Any facial hair, hair getting anywhere under the mask seal, temple hair too far forward, sunken temples or facial scarring, protrusions or blemishes, having the mask too loose or too tight, can all be reason enough to keep the Quantifit from pulling a negative pressure within the mask. There are other obstacles that can come into play which are too numerous to list. With more experience fit testing, it’s easier for one to see potential problems with fit. 
  2. To further check on the mask fit, do a user seal check for 10 seconds. Press the Seal Check button and take in a breath allowing for plenty of suction on the mask. If after 10 seconds the mask “drops” when releasing the Seal Check button, then there was a good seal in place. If there is no felt movement when the Seal Check button is released, then the air has leaked out in those 10 seconds. 
  3. Exhalation valves may be dirty or creased allowing air to be pulled into the mask. While the inhalation valves must be removed or propped open, the exhalation valve must remain in place and maintain a good seal. 
  4. On the mask, the apex of the head straps should sit on the crown of the head and not off to one side or the other. 

Adapter Fault:

  1. The adapters must be kept clean and in good shape. 
  2. Disconnect and reconnect all tubes to make sure they all “snap” into place for a secure connection
  3. With a Phillips-head screwdriver, lightly turn the screws on the perimeter of the blue tube side of the adapter. These screws are glued into place, but can become loose over time. 
  4. If the adapter had been dropped or crushed, a hairline crack might cause leakage. 

Operator/Subject Error:

  1. Holding breath. The most obvious error that could take place is when the subject does not remain completely still. He or she must be instructed to hold breath, keep lips and teeth together, no swallowing, etc. Tell the subject to hold a comfortable breath. When holding a deep breath, there is more air fighting to get out of the lungs, and this could cause movement or actually be more of a challenge for the subject to hold. The Quantifit is very sensitive and will even register slight head movement.
  2. If the Trigger button is pressed while the test subject is still breathing or inhaling, the Quantifit will display a message stating that the breath must be held before the measurement can begin.

If it’s only one or two people who won’t pass, but others are passing, this would indicate:

  1. A poor fit, try a different size or brand of mask. 
  2. Hair, not clean-shaven, scar, or some other impediment may be breaking the surface of the mask. 
  3. Test subject not holding breath properly.
  4. In rare cases, the test subject might have a hole or defect in his or her eardrum.
  5. Dirty mask/inhalation valve. Even if the valve does not look dirty, wipe the inside of it with a wet finger or cloth.

When traceline quickly goes up and down at the beginning of a test, this always indicates that the inhalation valve on the mask has not been propped open or removed. 

When the fit factor is 0, this indicates that the Quantifit was unable to get sufficient data to calculate a fit factor. This typically happens when there is lots of air movement in the mask. 

This would indicate too much leak in the mask. You should try these troubleshooting steps:

  1. A poor fit, try a different size or brand of mask. 
  2. Hair, not clean-shaven, scar, or some other impediment may be breaking the surface of the mask. 
  3. Test subject not holding breath properly.
  4. In rare cases, the test subject might have a hole or defect in his or her eardrum.
  5. Dirty mask/inhalation valve. Even if the valve does not look dirty, wipe the inside of it with a wet finger or cloth.

If you cannot get a single person to pass, try these troubleshooting steps:

  • If each person is tried on the same sets of masks, use another mask that has not been used.
  • Do an adapter check
  • Make sure all the screws in the top are in all the way.
  • The tube connectors should not be able to turn with your fingers, if they do, they are too loose.
  • The diaphragm may have a hole, puncture, or leak. In this case, change out the diaphragm with a new one.
  • Faulty valve pump on Quantifit. One indication of this would be that a person can still inhale while the Seal Check button is pressed.



This diagram shows the protocols that are available with the Quantifit. Please note the protocol that meets minimum requirements for each mask type, and those that are even more health protective in emulating real-world work rates.

If the daily calibration check passes on the Quantifit, you can be assured that the Quantifit is operating properly and measuring within specifications. All issues with mask testing would be outside of the Quantifit.

  1. If the daily calibration check fails, first check the hoses, and make sure that the clear hoses are connected to the front and to the back. (The blue hose is not required to be connected for this step.)
  2. Check the hoses to make sure there are not openings or splits, especially toward each end.
  3. If the instrument cannot pass the daily calibration check, then you will need to call OHD tech support at 1-888-464-3872, option 4.

Fit Factor = 0

This would indicate that the Quantifit did not receive enough data to calculate a fit factor. This could mean that the test didn't finish, or that the test traceline was too wavy.

Fit Factor below minimum passing fit factor 

This clearly indicates that a leak is recognized by the Quantifit, and while it can complete the test, too much air leaked into the mask during the test to provide an adequate seal. 


Mask Leaking - test does not finish

In many cases, the measured leakage exceeds the ability of the Quantifit to measure. Within the Quantifit, once the measuring cylinder reaches the maximum capacity, the cycle will immediately cease and abort. If the test time does not travel the full 8 seconds of the test, the leak is too great.

The FitFactor will equal “0” and the Leak Rate will equal “0.0.” After determining the source of the large leak, repeat the step.


Can't achieve challenge pressure

At other times the Quantifit will labor to create the negative pressure only to end the test measurement before the 8-second time. This leakage, although less than maximum, still fills the cylinder and abruptly ends the test. It will look something like this:


Graph has a lot of sporadic movement.

The Quantifit is very sensitive to pressure changes inside the mask. If the pump motor sound alternates between high-and low-pitched whines and the pressure tracing line, even after challenge pressure is attained, is erratic, the Quantifit is sensing variations in pressure.

If the traceline varies significantly, and the Quantifit cannot obtain a consistent challenge pressure through the duration of the test. The operator will retry the test. There are a number of causes for this type of reading.

  1. Movement by the person being tested needs to be minimized. Actions such as swallowing, opening the mouth, and moving the tongue can adversely affect the pressure sensor.
  2. Air inhalation or exhalation, even slightly, creates dramatic changes within the mask. Reinstruct the test subject to maintain breath holding during the test measurement.
  3. A test subject may be unable to stop the flow of air through the nose while holding his breath. A nose clip can assist the subject (be sure that the nose clip does not interfere with the fit if the respirator).
  4. Improper breath hold. Instruct the user to relax, take a medium breath and hold as if going under water.


Consistently Low Fit Factors

When fit factors are consistently low, the mask may be a poor fit for that person. If the graph looks normal and the fit factor is low, that means that the Quantifit is successful in meeting the challenge pressure, but a large volume of air had to be removed to achieve that pressure, which means the leak is too great.

When the leak rate is high, the graph can still look somewhat normal. The Quantifit will often be able to keep up with the leak and give a good test result, regardless of the fact that the leak is too large to yield a passing fit factor.

Possible Solutions

  1. As in other leakage situations (see HIGH LEAKAGE ), check all hose connections, adapters, and adapter connections to respirators.
  2. Check for proper tension of respirator to face.
  3. Try a different size or different respirator.
  4. Have Adapter checked for leaks (call OHD for this service).


Quick movement of traceline

When the Quantifit gives erratic, jerky movement during the test, especially before the challenge pressure is attained, and the challenge pressure takes awhile to attain, the problem might be an easy one to find and solve. When the inhalation valve is not propped open or removed, the Quantifit is unable to get to the airspace touching the facepiece seal. The Quantifit is only looking at the seal of the inhalation valve, which can rapidly “flutter” with the sealing and breaking of the seal. The inhalation valve can easily be missed on some full-facepiece respirators that can be converted from SCBA or airline to Air Purifying Respiratory.

Possible Solution

Insure that the Inhalation Valve is propped open or removed.




If there is an inhalation valve inside the mask where our adapter connects to the mask, this will definitely interfere with the testing procedure. To begin the test, the Quantifit first exhausts air out of the mask to get to the target negative pressure. If the inhalation valve is in place, the Quantifit will not be able to pull air out of the mask because the suction will pull the valve shut. This usually shows up on the graph as a lot of up and down movement when the test begins. 

If it's easy enough to remove the valve and replace it, we suggest doing this. If it's difficult at all, you can prop open the valve before the test. If you have a two-adapter kit, the critical one is the side with the two ports on it. We sell a Valve Prop that can be used to keep open the diaphragm. If you do not have a valve prop, a good substitution would be to cut a drinking straw to approximately two inches. Fold this in half so that it makes a V. Insert the open end of the V into the spoke-wheel gasket that holds the diaphragm in place. You can achieve the same results with a rolled-up piece of paper.

Of course, you'll want to remove this prop after the test so that the mask is back in its original form.

OSHA 1910.134 Appendix A:

"4. (a) (4) The respirator filter or cartridge needs to be replaced with the CNP test manifold.
The inhalation valve downstream from the manifold either needs to be temporarily removed
or propped open."


With frequent use and handling of the trigger button, things can wear down. These are a few things to look for:

  1. If the button itself doesn't spring back after being depressed, the spring inside could be out of line. While this indicates a trigger button that needs to be replaced, you may be able to release the spring by holding the assembly by the cord, and forcefully hitting the plastic part onto a hard surface. See #3 if this doesn't work.
  2. If the motor constantly runs, remove the trigger button to see if the engine stops. If it does, it could be the contacts on the trigger button assembly. Clean off the silver part that plugs into the Quantifit and see if this resolves the problem. If not, the instrument will need to come back for service.
  3. If the trigger button is not working, you can still complete a test. Instead of using the trigger button, you can use the buttons on the front of the Quantifit. You can press and hold Seal Check button, and while that is depressed, press and hold the Help button. Once the test begins you can release the Seal Check button but keep the Help button depressed until the test step has been completed. 

The Quantifit can only print to an HP printer that has the printer language of PCL 3 Enhanced. HP changes their printer offerings ever six months, so it is difficult to keep up with which printers work and which ones won't. OHD recommends the HP Mobile line, which currently includes the 100, 150, and 200. We do not guarantee that other printers will work. The simple way to see if your printer works is to plug in the printer and go to Printer Test which is under the Utility menu. If it prints, the printer is compatible with the Quantifit. If it does not print, the printer is not compatible, and there is nothing you can do to get that printer to work other than to run the Quantifit through the FitTrack Gold software. 

We do know that the DeskJet line is not compatible, while several from the OfficeJet line and ENVY line are compatible.

If you should get the Home Position Error Fault, this is most likely a fault that needs to be corrected by OHD technical services. 

You can try to correct the issue by going to System Reset under the System menu. If this does not correct the fault, fill out a Service Return Form, print a copy to keep for your records, and a copy to include with your shipment. An RMA number is not needed.

Installing Software

ONLY if you change a Windows 10 setting BEFORE you attempt to install the software.

  1. Click on your Windows Start Button (black and white Windows flag in lower left corner)
  2. In the search field, type in "Turn Windows Features on or off"
  3. Select this option from the search results
  4. Look for .NET Framework 3.5 (or 3.51)
  5. Click on the plus sign to the left of the option to display two options below this main Framework option
  6. Make sure that all three checkboxes related to this .NET Framework are check

That's it! Now you can install the software. Check our downloads page to make sure you have the newest version of FitTrack Gold software.

In order to completely install the driver (software communicator) for the Quantifit, the Quantifit must be attached to the computer. This message is normal if the Quantifit has not been connected. Once it is connected, this message will go away.

If you are using a PC for record keeping only, you can go to TOOLS and click on the MODE tab, and select DISCONNECTED MODE. This way the software will not look for the Quantifit each time you open the software.

  1. Make sure you have the newest version of FitTrack Gold. You can check our Downloads Page to see if you have the newest version. 
  2. This message indicates that the SQL Express database was not correctly installed. There are a number of issues that this could indicate, including strict security on the PC, the software was not installed under an Administrator password, an error could have occurred during installation, and a host of other reasons.
  3. SQL Express was not installed
    1. Click on your PC's START button, and type in "services"
    2. You will see a Services choice appear, with an icon of two gears. Click on this option.
    3. You will see a list of services that are on your PC. Scroll down to find SQL Server. 
      1. If there is no SQL Server listed, the database was not installed. You must first uninstall FitTrack Gold (see instructions below), and run the installer again. Be sure that the software is installed under an Administrator password.
      2. If you see SQL Server, but not "SQL Server (FITTRACK GOLD)" this would mean that the database was installed, but FitTrack Gold was unable to write the appropriate files to the database. Uninstall FitTrack Gold and run the installation file again. (See below to uninstall the software.
      3. If you see SQL Server (FITTRACK-GOLD), then the database was properly installed. Under status, it should be listed as RUNNING. If not, right-click on the Status column, and select START. Proceed to open FitTrack Gold.
    4. Uninstall FitTrack Gold
      1. Click on your START button in Windows, and type in UNINSTALL SOFTWARE.

There are a few things that would cause a database error message when the software had previously been running with no issues: 

  1. SQL Services stopped running
    The database is SQL Server Express. Windows sees this as a service running on your computer, and it is totally separate from the FitTrack Gold software. If the SQL services stop running for any reason, this would cause a database error. 

    In your Windows search bar beside or when clicking your Windows Start button, type in: services. You will see a search result come up that has an icon that looks like gears or sprockets. Click on this selection.

    In the list of services that comes up, look for SQL Server (FITTRACKGOLD). Under the Status column, it should have “Running.” If not, right-click on SQL Server (FITTRACKGOLD) and select “Start.” 

    Once the service has started, open FitTrack Gold.
  2. A damaged configuration file
    The solution to this issue would be to delete the configuration file, and then upon opening FitTrack Gold, a new one will be rebuilt.

    The file that needs to be deleted is in a hidden folder. So before browsing to the file, you will have to tell Windows to show hidden files.
    1. In the search bar mentioned in #1, type in “show hidden files.” You will see a search result of “Show hidden files and folders.” Click on this selection.
    2. Look for a round button that says, “Show hidden files, folders, and drives.” 
    3. Click “Apply” then “OK.”

Open a folder and browse to: C:\Users\[Your login name]\AppData\Local\ Occupational_Health_Dynam\ You will see a long folder name that starts with FitTrackGold.Presentation. Select this folder and delete with the delete button on the keyboard.

Close all folders, and open FitTrack Gold.

  1. If the first two options do not work, uninstall and reinstall FitTrack Gold.
    Please check our website, ohdusa.com, to get the latest version of software. While your data will not be deleted, it’s always a good idea to back up the software before attempting this.

    Type “add or remove programs,” and make that selection from the search results. In the list, select FitTrack Gold, and select Uninstall. When the process is complete, run the software installer. FitTrack Gold will install, find the database, and be ready to use.

FitTrack Gold

If you get an error message while trying to back up your database, this is most likely because the path you are using is through a mapped drive. You can save to a network, but you have to go directly through the server to get to the proper place rather than using a mapped drive. 

If this problem persists, save the backup to its default folder and then copy it to the network drive. The default folder is C:\FitTrack Gold.

Occasionally, an instructional file might become corrupted or be experiencing some bad instructions. To correct this issue, you can delete the file and the software will rebuild the file the next time you launch FitTrack Gold.

First, you have to change a setting that allows you to display hidden folders before you can delete the file. Follow the instructions below for Windows 7 or Windows 10.

WINDOWS 7folder1.jpg

With a Windows folder open, you will see "Organize" at the top of the Window. Select Organize and then select Folder Options.

Once you are in the Folder Options Window, click on the View tab.

There will be a series of boxes, and 2 circles. Check the second circle that says, "Show hidden files, folders and drives." Click APPLY at the bottom of the window, and then OK.

Now you will browse to the location where a file folder needs to be deleted. Open a folder on your computer, and click on My PC in the left sidebar. From there you will go to C:\ Local Drive; C:\Windows OS; or C:\hard drive. This depends on which version of Windows 10 you have.

Once you open this file, you will follow this path:

  • Users
    • {your Windows login name}
      • AppData
        • Occuptional_Health_Dynamics
          • FitTrackGold.Presentation_....

This last folder will have a much longer name, but begins with the above name. You simply need to delete this folder (right-click on it and select Delete). 

Once the folder is deleted, you can launch FitTrack Gold, and the software will open by building a new file.



In the Search bar next to the Windows 10 Start Button, type in "File Explorer Options." The search will find this function in the control panel. Click on the link, and the options will appear.

Click on the View tab. There will be a series of boxes, and 2 circles. Check the second circle that says, "Show hidden files, folders and drives." Click APPLY at the bottom of the window, and then OK.

Now you will browse to the location where a file folder needs to be deleted. Open a folder on your computer, and click on My PC in the left sidebar. From there you will go to C:\ Local Drive; C:\Windows OS; or C:\hard drive. This depends on which version of Windows 10 you have.

Once you open this file, you will follow this path:

  • Users
    • {your Windows login name}
      • AppData
        • Occuptional_Health_Dynamics
          • FitTrackGold.Presentation_....

This last folder will have a much longer name, but begins with the above name. You simply need to delete this folder (right-click on it and select Delete). 

Once the folder is deleted, you can launch FitTrack Gold, and the software will open by building a new file.

How do I....

In FitTrack Gold, go to the TOOLS menu. Click on the RESTORE tab, and choose the button FROM FITTRACK 5.0.1.

  1. Click on the BROWSE button to browse to where you saved the FitTrack database. This can be found in the path C:\Program Files*\OHD\5.0.1\FitTrack.mdb. (*the Program Files might have (x86) after it.) 
  2. If FitTrack 5.0.1 was installed on the current computer you are upgrading on, you would browse to the path in the previous step.
  3. Once the file is selected, click RESTORE. The first prompt will ask you if you want to do a backup first. This is a good idea if you have any data in the current database, as the current database will be replaced with the 5.0.1 database.

You can import data from the Quantifit in two ways: through a direct computer connection, or by transferring data to a USB memory sick.

  1. Direct Computer Connection
    1. Connect the Quantifit to the computer via the included USB cable. The square end connects to the PC port of the Quantifit, and the other end connects to any USB port on the computer.
    2. Open FitTrack Gold and go to the TOOLS menu.
    3. In the IMPORT/EXPORT section, select IMPORT FROM QUANTIFIT
    4. Click on IMPORT, and the data on the Quantifit will be opened into the Company that is currently opened.
  2. USB Memory Stick
    1.  Save data to memory stick from Quantifit

      1. Place memory stick in the upper USB port on the back of the Quantifit

      2. On the Quantifit, scroll to the System menu

      3. Scroll down to the last option, Datalog

      4. Turn the knob counter-clockwise to the File Menu option

      5. Select Save Datalog

      6. Type name (up to 8 standard alpha-numeric characters)

      7. Select Done

    2. Import data from the memory stick

      1. In FitTrack Gold, click on the BROWSE button to browse to the file from the Quantifit.

      2. This file may remain on a memory stick, or may have been copied to the location on the computer. 

      3. Select the file and click OPEN.

      4. Back on the FitTrack Gold screen, select IMPORT. The data from the selected file has been imported into the open company.

      5. The Conflict Resolver window uses "smart match" to allow the person importing to decide if two people are the same. If the import tool recognizes two last names that are the same, and the first initial is the same (but first name is not an exact match), the Conflict Resolver will pop up. This would allow the user to match Dave Short with David Short. If the matched people are in fact the same person, click on the person in New Records and then Existing records and select UPDATE. If they are not the same person, select ADD NEW. A final option is SKIP, if the person selected should not be imported into the database.

To import names, birthdates, and other information for the test subjects, in the Tool section, you will see an option to Import Personnel. Select this tab, and then Save Personnel Template to download the template that must be used to import this data.


The Export to Cority (formerly Medgate) option allows the data to be exported and formatted so that it can be imported into Cority medical records software. The data will be exported only from the company that is currently open.

  1. In the Tools section of FitTrack Gold, select Export.
  2. In the drop-down menu, which is pre-populated with "Personnel and Test Data," select "Cority."
  3. When Include "All Dates" is checked, the export will include all tests within the open company.
  4. When the Include All Dates  is not checked, the user can enter a date range of tests to be
  5. exported.
  6. Click on Export , and browse to a location where the data will be saved.
  7. A name of the file will be required in the File Name field.
  8. Click on Save , and a notification will display to confirm that the data had been exported.

In the Admin section of FitTrack Gold, in the Reports section, choose Report Format Settings. 

On the logo line, you can browse to where you have a copy of your logo saved. The logo must be in the format of .jpg .png or .bmp.

The remaining lines can be used for your company information or any message you want to display on each report. The first line is a little larger and bolder than the two lines following.

There are two methods in which to get data from the Quantifit into FitTrack Gold software. You can directly connect to the Quanfitit and import the data, or copy the data from the Quantifit onto a thumb drive, and import the data.

Directly from the Quantifit:

  1. Go to the Tools tab, and in the Import/Export section, there will be an option to Import from Quantifit. 
  2. If the Quantifit is not connected, connect it and power it up, and choose the Connect button.
  3. Click Import, and the data will be imported into the open company.
  4. Once you know that you have safely imported all of your data, it's a good idea to delete the datalog from the Quantifit. This will lessen the chances of data corruption.


From a USB Memory Stick:

  1. Plug a memory stick (thumb drive) into the back of the Quantifit using the upper USB port
  2. On Quantifit, go to System > Datalog
  3. Select File > Save Datalog
  4. Name the file and select Done
  5. When Quantifit is finished saving the file, plug memory stick into computer
  6. Open FitTrack Gold, go to the Tools Tab
  7. Click on Import From Memory Stick
  8. Browse to the memory stick and the file name
  9. Import (NOTE: The data will be imported into the currently opened company)