asma-1 Asthma Monitor USB (OASYS)

Designed for use with Occupational Asthma expert SYStem (OASYS)

The asma-1 Asthma Monitor USB (OASYS) by Vitalograph provides automatic entry of PEF and FEV1 results on OASYS (Occupational Asthma expert SYStem). An expert software for detecting work related changes in peak expiratory flow readings, OASYS was developed by Midlands Thoracic Society, world leaders in occupational medicine and is available for download from their website.  OASYS provides:

  • Automated data capture, archiving and analysis
  • Accurate and reliable asma-1 usb data download
  • Validated Work Effect Index of work related asthma


The Vitalograph asma-1™ is lightweight home use electronic respiratory monitor that measures PEF and FEV1. It offers greater accuracy than mechanical peak flow meters and links easily by USB for reporting.

  • Measures FEV1 and PEF.
  • Displays % of personal best FEV1.
  • Electronic record – no need for record cards.
  • Set unique ‘personal best’ zones for test subjects.
  • Automatically stores best values in a test session.
  • Quality of blow indicator.
  • 600 test memory.
  • Suitable for use with Bacterial Viral Filters (BVF™).
  • Compliant with: ATS/ERS 2019 and ISO 23747 / 26782 / 13485
  • Large, easy to read display.
  • One of our 4000 Series of respiratory monitors and screeners


One of our 4000 Series of respiratory monitor and screeners, the asma-1 USB (OASYS) comes with:

  • Pouch
  • Instructions for use
  • USB cable
  • 2 x AAA Batteries


How does OASYS work?

OASYS is a computer diagnostic occupational asthma expert system which assesses the probability of an individual having work-related asthma. The OASYS program scores each rest-work-rest or work-rest-work complex in a serial peak flow record between 1 and 4.

OASYS consists of the following modules:

  • A module for allowing entry of PEF readings recorded by the patient for either manual entry of PEF data or automatic capture of PEF data from the Vitalograph asma-1 usb respiratory monitor
  • A module to plot these recordings in a graph format. These graphs include a plot of mean PEF for each two hour period separated into work/rest days and plots of daily maximum, minimum and mean readings again divided into work and rest periods
  • A module to calculate scores indicating how likely it is that an occupational asthma diagnosis will be supported by this data


For more information and to download OASYS for free:

Product Code: 40448

Respiratory Monitor asma-1 USB
Model 4000
Dimensions 109mm (length) x 63mm (width) x 42mm (height)
Accuracy Better than ± 3% (FEV1), ± 10% (PEF)
Flow Detection Principal Stator rotor
Back Pressure Less than 0.15kPa/L/second @ 14L/s
Measurement Range PEF: 25 – 840 L/min BTPS FEV1: 0 – 9.99 L BTPS
Maximum Test Duration 1 second
Quality Check Time to Peak Flow >120ms or a cough detected in the first second
Power Supply 3V (2 x 1.5V AAA batteries)
Battery Life 3 months of use, 3 tests per day
Performance Standards & Guidelines ATS/ERS 2019, ISO 23747:2015, ISO 26782:2009
Communications USB2.0/3.0
PC Requirements Windows® 7, Windows® 8 or Windows® 10
Auto Power Down Time 2 minutes

Product Specification

asma-1 asma-1 Child asma-1 USB/BT copd-6 copd-6 USB/BT lung monitor lung monitor USB/BT lung monitor BT Smart lung age
FEV1 Ratio
Lung Age
Memory 600 600 600 0 0 200 200 600 0
Personal best
PDF Reports
Import Data to SpV


A BVF is recommended to use if the asma-1 USB is intended for multi-subject use. The plastic mouthpiece supplied with the device can be used where the device is intended for single-subject use. For subject groups with excessive sputum production, a BVF can be used to protect the device flowhead from exhaled particulate matter where this may be a concern.

The (!) appears after a blow if; Vext (extrapolated volume) is > 5% or 100mL of FEV6 or a cough is detected in the 1st second.

If a new BVF is used for every test subject and the asma-1 USB is stored in a clean, dust free environment, then the device should require only surface cleaning using a 70% isopropyl alcohol wipe. If you suspect that the device flowhead has become contaminated, refer to the 4000 Series Cleaning Instructions.

The asma-1 USB connects to Oasys on your PC using the USB cable supplied.


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