SpiroAir PFT System

The culmination of PFT expertise

SpiroAir is the culmination of manufacturing and pulmonary function expertise that really has no equal. The vast experience behind the design of this remarkable instrument should not be taken for granted. The stable of engineers and clinical experts behind this design can show a history of superb clinical achievements. Each facet of scientific measurement has been scrutinized to ensure adherence to verifiable standards. SpiroAir is an instrument that respects and utilizes the science behind each measurement.









Simply the most accurate Spirometry available!
The 12 liter rolling seal spirometer follows in the tradition of the world renowned standards created by Philip Morgan in the 1960’s. Low friction technology and insightful mechanical construction have combined to provide a system with superior high frequency characteristics and very low resistance. Top quality pneumotachograph heads present a resistance of typically 10mm water for 10 liters/second. At 10 liters per second ‘SpiroAir’ has a resistance of less than 5mm of water back pressure. Measurements of spirometry are too frequently underestimated due to flow sensor limitations. There are no flow limits in either the SpiroAir rolling seal spirometer or ComPAS Freedom™ software. In clinical measurement there simply is no equal! For further details please ask for our report showing comparison to the ATS 24 Loop standards. For customers wanting to bypass the patient valve and breathe directly on the spirometer, an accessory kit is provided.

The SpiroAir & ComPAS Freedom™ – Make Everything Easier
Too many pulmonary function instruments in today’s competitive market are designed with obsolescence in mind. Not so with any of the Morgan Scientific or MediSoft products! It is not unusual for our systems to operate for 15 years and there are countless examples of even greater longevity. Furthermore, the cost of maintaining the magnificently engineered Body Box is far less than other manufacturers. Not only is the cost of service negligible, but the costs of testing supplies are also far less than alternative systems. For DLCO studies, only a single cylinder of diffusion gas is required.

12 Liter Rolling-seal Spirometer – SpiroAir Fully Digital Positive Displacement PFT System
The 12 liter rolling-seal spirometer is the standard by which all other volume measurement devices are compared. There is no doubt that in pulmonary measurement, all flow-based devices have their boundaries of accuracy; a problem not limiting the SpiroAir! The horizontally mounted spirometer has superb digital discrimination and has the lowest resistance of any competitive device.

SpiroAir features:
-Gold standard volume measurement – 12 liter rolling seal spirometer
-Automatic self-centering spirometer
-Helium dilution lung volumes with automatic filling and O2 compensation
-Proven pressureless DLCO circuit (no demand valves employed)
-Precise gas analysis and gas conditioning
-Respiratory pressure measurement (MIP/MEP)
-Fully pneumatic patient valve (no balloon valves employed)

SpiroAir and ComPAS Freedom™

The ComPAS Freedom™ Task Manager was created around the needs and requirements of one of America’s most prestigious teaching hospitals. The versatility of the design makes the Task Manager equally suitable in high volume teaching centers or smaller pulmonary practices.

When tests are completed in the pulmonary lab, results can be routed to any network-connected station for physician interpretation. In cases where multiple physicians will interpret results, the Task Manger automatically sends the appropriate patient results to each physician.

Internal “Task Notes” can be attached to patient results and sent to colleagues. Tests can be routed to pulmonary fellows for

SpiroAir ComPAS
preliminary review and then on to faculty staff for final interpretation. If reports need to be printed and sent to referring physicians, completed tests along with the interpretation can be forwarded to the department secretary for printing. In smaller centers, test results can be sent from the pulmonary lab directly to the attending physician. At his or her desk, the interpreting physician can log into the Task Manager and review a variety of customizable report formats and engage a personal template of interpretation text. The computer impression is available for referral as the interpretation is being considered.

ComPAS Freedom™ has a multitude of beautifully organized and graphical report formats. At Morgan Scientific, we pride ourselves in after sales customer support. The ComPAS Freedom™ license gives you access to experts in pulmonary measurement and report design. We will be pleased to customize a report around your particular preferences.

The Task Manager simply requires connectivity to the SQL database server. Further data distribution to hospital-wide information systems usually requires a specialized interface. Please contact us for further details.


Features & Specifications

Below you will find detailed information about the SpiroAir. Information such as the Features of the SpiroAir, how it was Designed & Manufactured, and also the detailed Product Specifications.

Test Capability

SpiroAir has been scientifically designed to be an instrument of impeccable accuracy and clinical background. This is an affordable high quality research caliber system that is truly capable of respiratory measurement in cases of severe disease.

SpiroAir tests Simple Spirometry, Flow Volume Loops, MVV, Lung Volumes by either helium dilution (FRC) or nitrogen recovery (TLC), Single Breath Diffusion, Membrane Diffusion and Capillary Blood Volume, Respiratory Pressures (MIP and MEP), Bronchial Challenge Testing (Methocholine, Exercise or Cold Air), Manual Entry for ABG’s, Exercise and much more.

Respiratory Pressures

Maximum inspiratory and expiratory pressures can be measured while seated at the patient valve. ComPAS Freedom™ provides for measurement and storage of MIP and MEP when performed at FRC as well as the traditional TLC and RV condition. SpiroAir has a small footprint and can be comfortably set on a bench or supplied with a durable mobile cart.


Ergonomic Patient Valve

The SpiroAir pneumatic valve has been designed for long life and minimum preventative service. The valve cleverly caters to the requirements of all available tests affording a single patient connection yet maintaining a minimal deadspace. There is no need to frequently change unreliable balloon valves with SpiroAir! Utilizing a direct piston drive, the valve is suitable for thousands of quiet trouble free operations.

For helium dilution studies, an incorporated pneumotach allows for automatic “switch-in” at end-tidal expiration.

Although the valve is usually isolated by a bacterial/viral filter, disassembly for cleaning is a breeze!


Helium Dilution Lung Volumes

Helium dilution testing has been optimized in this remarkable new design. The 12 liter spirometer not only self-centers for routine spirometry and flow volume studies but also automatically fills, empties and flushes in a very short period during closed-circuit mode.

The background mixture for helium dilution testing is automatically mixed by connection to cylinders of 100% He and 100% O2. Utilizing the two cylinders of 100% mixture saves considerable cost in test gas.

While the whisper-quiet turbines direct air around the closed-circuit, carbon dioxide is scrubbed by a chemical absorber. Oxygen balance is maintained by both fast response oxygen analysis and absolute volume baseline monitoring thus ensuring calm comfort for patients of all size and condition.


Single Breath Diffusion

SpiroAir has been designed to assure reproducible DLCO results without any “computer enhancing” or manipulation of component variables (i.e. volume, time or gas analysis). The patient breathes from a gas reservoir at atmospheric pressure thus avoiding problematic interference of a demand valve. The sample circuit and collection bag are automatically tested for any leaks prior to each test. Gas sampling and test performance are reviewed to confirm clinical validity of each effort.

Measurements of DLCO on SpiroAir adhere to the standards on which predicted equations are based. Both the DLCO and VA (Alveolar Volume) data are highly reproducible and can be relied on for clinical interpretation. ComPAS Freedom™ software also provides correction of DLCO and DL/VA for lung volume.

SpiroAir PFT System

SpiroAir Specifications


Flow Volume Measurement: Rolling Seal Spirometer

  • Volume: 12 L
  • Range: 0 to +/- 15 L/sec
  • Accuracy: Better than 2% of scale
  • Resistance: @ 10 L/sec < 5mm H2O
  • Digital resolution: Optical encoder 8ml
  • Temperature: Internal spirometer thermistor

Carbon Monoxide Analyzer: Chemical Fuel Cell

  • Range: 0 to 0.500% CO
  • Accuracy: +/- 2% (0 to 0.300% CO)
  • Response: Fixed to 30 seconds
  • Working: Life 2 to 3 years
  • Replacement: Simple plug-in part

Computer Requirements: Minimal Specifications

  • Speed: 2 GHZ or faster
  • RAM: 512 MB
  • Hard Disk: 80 GB
  • Operating system: Windows® 2000, XP Professional
  • Printer: Any Windows® compatible

Helium Analyzer: Thermal Conductivity

  • Range: 0 to 15.00% He
  • Accuracy: +/- 1% (2 to 14% He)
  • Response: Time Fixed to 30 seconds
  • Oxygen: Compensation Automatic

Lung Volume Gases 100% Helium and 100% Oxygen

  • All regulator outputs: 50 psi

DLCO Volume Measurement: Lilly-style Pneumotachograph

  • Flow Range: 0 to +/- 20 L/sec
  • Accuracy: Better than 2% of scale
  • Resistance: @ 10 L/sec < 12mm H2O
  • Pressure: Transducer Solid State
  • Frequency: Response Flat to 50KhZ
  • Pressure Range: 0 to +/- 100cm H2O

Dimensions, etc. SpiroAir Uni

  • Spirometer & main chassis: 7″ W x 13″ H x 20″ D
  • Weight: 20 kgs (44 lbs)
  • Mobile Cart: 30″ W x 28″ H x 29″ D
  • Weight: 30 kgs (67 lbs)
  • Patient Valve Arm: 26″ vertical adjustment
  • Power: Single plug 110v

Oxygen Analyzer Galvanic Cell

  • Range: 0 to 100% O2
  • Accuracy :+/- 1% (0 to 100% O2)
  • Response Time: Fixed to 30 seconds
  • Working Life: 18 months to 2 years
  • Replacement: Simple plug-in part

Respiratory Pressures: Solid State Pressure Transducer

  • Range: 0 to +/- 300 cm H2O 

Gas Requirements Single Cylinder

  • DLCO Gas: Standard DLCO mixture (0.300% CO, 10.0% He, 21.0% O2 balance N2)

Computer Interface

  • Communication: Serial

Call for immediate assistance 877-738-3424

Bacterial Filter Kits
5554548-B Filter with Rubber Mouthpiece 50/Box

5554595 Filter, Rubber Mounthpiece, and Noseclip 50/Box

Drierite 1 LB Jar

PFT111600 – Each

Bacterial/Vital Filters

5554100 100/Box

Disposable Nose clips

5550047 – Box of 100

Pneumotach Filter Screen


Reusable Nose Clip

PFT9015 – Each

Complete Absorber Column

PFT71025 – Each

Inspirate Bag (Large)


Expirate Bag (Small)


Green Soda Lime

PFT71594 – Each

1. Why should I choose a SpiroAir over the TransAir2?

The rolling seal spirometer in the SpiroAir is the lowest resistance, positive displacement spirometer in the world! Measurements of spirometry are absolutely accurate with no limitation of physiological flow rates. The SpiroAir also provides capability to measure lung volumes by helium dilution which will obtain greater accuracy for your more compromised pulmonary patients.

2. Is the SpiroAir with ComPAS Freedom™ software easy to learn?

Yes! Complete novices in pulmonary function can be testing patients after a couple of hour’s instruction. The software includes a magnificent Help library which can be accessed at any time during testing and includes pictorial and detailed instructions.

3. Is the SpiroAir inexpensive to operate?

Yes! The SpiroAir does not require pre-packaged proprietary chemical filter packs or expensive chromatograph columns. The SpiroAir will save you thousands of dollars in service and maintenance cost demanded by other manufacturers!

4. Is the SpiroAir suitable for children or subjects with small capacities?

Yes! The rolling seal spirometer is absolutely the most accurate device for the measurement of limited volumes and flow rates. The single breath diffusion design using high discriminating analyzers is particularly well suited to sick patients or small children.

5. Does the SpiroAir meet ATS and ERS recommendations?

Yes! Not only does this instrument meet and exceed all the new recommendations, the testing screens have been specifically designed around the guidelines and suggested protocols.

6. Is the SpiroAir easy to calibrate?

Yes! Calibration is guided by clear pictorial displays. The instrument is supplied with a high quality 3-Liter syringe and all calibrations can be included in either final or quality assurance reports.

7. Does the SpiroAir offer bronchial challenge capability?

Yes! The standard ComPAS Freedom™ software, supplied with the SpiroAir, provides the following test options: Pre and post Flow Volume Loops, Simple Spirometry, MVV’s, FRC by helium dilution, TLC by nitrogen recovery, DLCO, Membrane Diffusion and Capillary Blood Volume, Bronchial Challenge and manual entry of ABG’s and MIP/MEP’s.

8. Is oxygen compensation automatic during Helium FRC testing?

Yes! Using both the spirometer volume and direct measurement of oxygen background in the closed-circuit, oxygen balance is automatically maintained.

9. Is it easy to clean inside the spirometer?

Yes! The end turbine absorber unit is hinged to provide full access to the inside of the spirometer.

PFT Diagnostics

P.O. Box 455
Ellsinore, MO 63937

Phone: 877.738.3424

Email: tcrowley@pftdiagnostics.com