The Gold
Standard In
Fit Testing
Quantifit...the Gold Standard in Respirator Fit Testing
Here’s how the
Quantifit works.
During a fit test, the respirator inlets are capped with
test adapters, and the
inhalation valves are
removed from the mask.
With the test subject holding
his or her breath for no
more than ten seconds, the
Quantifit then establishes
and maintains a slight vacuum, or controlled negative pressure, inside the
Quantitative respirator
fit testing is a practice
that has been around
since the late 1960’s.
While there have been
several ways in which
to perform a respirator
fit test, there were
never any scientific
studies to prove that
these methods actually
worked. These technologies have simply
been “accepted” because they were
the only way to do quantitative fit
testing. The technology seemed to
make sense, and at least it was better than nothing at all. Or was it?
mask. Since the respirator
inlets are sealed, all sources
of leakage into the mask
are through the face-tofacepiece seal. The volume
of air drawn out of the
mask by the Quantifit during this short period of time
is equal to the leak rate into
the mask through the faceto-facepiece seal.
It’s that simple….
Things changed in 1992 when the
idea of Controlled Negative
Pressure (CNP) was implemented in
a whole new approach to fit testing. This revolutionary way to perform a respirator fit test could be
subjected to scientific scrutiny. The
results? Unlike all other methods of
fit testing, Controlled Negative
Pressure was proven to quickly and
accurately measure respirator leakage, which is the key to measuring
respirator fit.
CNP technology was accepted by
OSHA in 1998, and has quickly
been adopted by industry to be
the quickest and most accurate
way to perform respirator fit testing—the gold standard in respirator fit testing.
While old technologies are sometimes hard to give up because,
“we’ve just always done it that
way,” the OHD Quantifit offers an
impressive array of advantages that
can dramatically improve your respirator program. Within the first ten
seconds of testing, you will know
whether the respirator user has a
basic fit or not. And the OSHAaccepted CNP Redon protocol takes
as little as two to three minutes. If
other quantitative fit test instruments measured accuracies of less
than 40%1, why put your employees
at risk?
Controlled negative pressure has
proven to be the fastest, most accurate, and most health protective fit
test system available. The accepted
Redon test protocol allows you to
quickly assess respirator fit based
on three mask donnings. Given the
Quantifit’s speed and accuracy in
measuring actual respirator leakage, why would you subject your
employees to something that is less
than the best?
Features & Benefits
■ Proven Technology The
OHD Quantifit is a highly specialized instrument which utilizes
the scientifically-proven and
patented CNP (Controlled
Negative Pressure) technology to
directly measure respirator leakage. The OHD Quantifit is
accepted by OSHA and appears
in the Federal Regulations governing fit testing [29 CFR
1910.134]. The Quantifit is also
included in the Canadian
Standards [CSA Z94.4-02] and
UK HSE Standards [EN132-149].
■ Fastest Fit Testing
Available With the OSHAapproved CNP REDON respirator
fit test protocol, a fit test can be
performed in as little as 2-3
minutes and there is no waiting
period for smokers as required
with other fit test methods. The
REDON protocol uses CNP technology’s superior speed and
accuracy to help achieve the best
respirator fit possible. The multiple donnings required assures
that the worker knows how to
don the respirator correctly with
each use.
■ Most Health Protective
Peer-reviewed, scientific studies
have shown that the OHD
Quantifit produces much more
accurate, more health protective, and more believable test
results than other systems. In
studies where a known calibrated respirator leak is present, the
OHD Quantifit measured 98%
of known calibrated leak. The
aerosol-based system measured
only 37% of known calibrated
■ Easy to Use The Quantifit
takes the user through the test
protocol step-by-step so that
there is no guess-work, and no
time needed to pre-instruct the
employee being tested. There is
no instrument warm-up period to
worry about, and the one-minute
daily calibration assures that the
Quantifit is working within a strict
tolerance. Ease of use means less
mistakes, and quicker testing.
■ Most Rigorous Test The use
of ambient air as a standard
(non-varying), gaseous challenge
agent provides a more rigorous
test of mask fit than does an
aerosol agent. If air leaks into a
respirator, there is a chance that
particles, vapors, or gas contaminants may leak in. When using
aerosol-based systems, the test
system can only see and measure some of the particles that
might enter the respirator.
■ Direct Measurement of
Leak The Quantifit directly
measures facepiece leakage.
There are no specific conditions
or environmental concerns when
testing with the OHD Quantifit.
The unit precisely measures leak
rate (in cc/min) by determining
the amount of air that leaks into
the respirator during the fit test.
■ NIST Calibration The ability
to calibrate the Quantifit with
generally available primary calibration systems assures a higher
standard of test results (NIST
traceable standard).
■ On-board Software Not
only does the on-board software
allow the Quantifit to be
extremely flexible, but all updates
can be achieved through a flashupgrade. Users can download
software from the internet and
easily upgrade the Quantifit to
assure the lastest and most upto-date version.
■ On-board Storage The
Quantifit can hold more than
1,000 fit test records. These
records can later be transferred
to the included FitTrack software
on your personal computer.
■ Keyboard Interface The
Quantifit can use a keyboard to
input data into the local memory.
This allows the user to input an
employee’s name and ID number, as well as the respirator
information. Keyboard input is
easier and quicker than touchscreen or other input methods.
■ USB Computer Interface
The Quantifit can be directly connected to a computer to operate
through FitTrack Software. This
gives the user more control and
advanced record keeping opportunities. All test results may be
transferred to the FitTrack software.
■ USB Memory Stick
Interface While data can be
transferred to a PC via the USB
connection, one may also transfer data via a USB memory stick.
This interface may also be used
to update the software in the
■ USB HP Printer This printer
connection allows for tests to be
printed directly from the
Quantifit, without the need for a
personal computer.
■ Optical Encoder Knob
The navigational knob on the
Quantifit allows for fast and
intuitive navigation through the
menus on the instrument. This
will more quickly bring you
directly where you choose to go.
■ Tilted Backlit Display
display can be adjusted for any
lighting situation, and is tilted for
optimum viewing whether the
operator is standing or sitting.
■ Universal Power Cord The
power cord for the Quantifit will
adjust to the proper voltage
regardless of the country in which
the testing is being performed.
The end user will simply swap out
the prong configuration to interface with the local settings.
■ Flexible Data
Management Software
While the OHD Quantifit can be
used as a stand-alone unit,
FitTrack software allows for easy
testing and dependable record
keeping through a personal computer. FitTrack can print individual reports or summary reports in
many configurations. Data can
be imported and exported to
meet various needs.
C Crutchfield, D Park, Effect of Leak Location on Measured Respirator Fit, Am. Ind. Hyg. Assoc. J. 58:413-417, 1997.
Quantifit Specifications
Selectable Test Model Parameters
Equivalent Fit Factors are calculated from actual
measured respirator leak rates, based on the
following “modeled” test parameters which are
user selectable:
Inspiratory Work Rate
Measurement of energy expended by test
subject in the normal working environment; indicated in thousands of calories
per hour (K-Cal/hr). Selections include
100 (light activity)
200 (moderate activity)
300 (heavy activity) and
350 (extreme activity)
Mask Type
Selections for full-face or half mask respirator types.
Cartridge Type
Selections for low, medium, or high density cartridge types.
Subject Gender
Selections for male & female test subject.
Selection choices affect modeled CNP
challenge pressure levels.
Selection choices affect modeled respiratory inspiration volume.
Dynamic Range
Leak Test Measurement
2 – 5000 cc/min
0.1 cc/min
Fit Factor Computation
6 – 53,000
Pressure Sensor Parameters
USB Interface
Dual Type A Ports
Supports Keyboard, HP Inkjet printer, or
memory stick
Single Type B Port
For connection to PC
Setup Memory
EEPROM, All Parameters
Data Retention
10 Years w/o Power
RTC, Datalog Memory
Rechargeable Battery
6 Months w/o Power
Operating Range
15 to 30 Degrees C
Storage Range
-40 to 60 Degrees C
Enclosure – Polyethylene Plastic Chassis – 1/8”
Aluminum, Face – Lexan, Back Printed
5.5 x 10 x 15.5 inches
139.7 x 25.4 x 393.7 mm
< 7.5 lbs. (3.4 kg)
0.01 inch H2O
Instrument Accuracy
Challenge Pressure
Leak Rate Measurement
±3% or ±3 cc/min, whichever is greater
Instrument Coverage
Two-Years Parts and Labor.
Technical Support
Free telephone technical support to original
owner of instrument.
Standard Accessories
Hard case with roller wheels and
retractable handle
USB Keyboard
Power Cord
Trigger Button
Triple Tube Assembly
PC USB Cable
FitTrack Software
Operator’s Manual
Data Retention
Pressure Range
0-20 inches H2O
± 0.25% FS
Over-Pressure Limit
60 inches H2O
Temperature compensation
15 – 30 Celcius
Pressure: Quick Connect,
Vent: Female Luer
Trigger Button : Phono Jack
Power Source
100 –240 VAC, 50/60 Hz
Power Supply Adapter
9 VDC, 5000 mA
Power Consumption
Less than 1000 mA
LCD Graphical 128 X 64 Pixels
Optional Accessories
Fit Test Respirator Adapter
USB Printer
Fit Test Card Laminator Kit
Extended Warranty
Prepaid Service Agreement
Optional Respirator Fit Test Adapters
3M Company
International Safety Inst.
Mine Safety Appliances
North Safety
Sperian (formerly Survivair)
US Safety
Call for information on additional respirator
manufacturers & models.
FitTrack Software
PC Requirements
Pentium 133 MHz or better
64 MB or greater
Operating System
Windows 2000, XP, or Vista
Digital Interface
USB 2.0 Port
Disc Space
25MB minimum
Any Windows-compatible printer
197 Cahaba Valley Parkway
Pelham, AL 35124
Local: (205) 980-0180
Toll Free: (888) 464-3872
Fax: (205) 980-5764
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