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Product enquiry
To enquire about any of the products on this page & for detailed pricing please fill out the form below & we will contact you with 1 working day.
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MIR User Manuals
Click here to download an MIR Spirolab 2/3 Manual
Click here to download an MIR Spirobank Manual
Click here to download an MIR Minispir Manual
Click here to download an MIR Winspiro Software Manual
Turbine Cleaning Instructions
To clean the turbine you can use any cleaning solution available on the market provided it isn’t corrosive and it is cold. We normally use Germozero Plus or Napisan. Nevertheless any equivalent cleaning solution is suitable provided it is an ammonium chloride cold solution
Extract the turbine from the holder and inspect it visually. Ensure that there are no foreign bodies, hairs or similar objects deposited within the body of the turbine, if there is then they must be removed. They can inhibit or even stop the free rotation of the turbine blade and thus compromise a Spirometry measurement. Immerse the turbine in a cold sterilizing solution, move it briskly inside the solution to remove impurities, rinse well without exposing the turbine to a direct jet of water and leave it to dry on a clean surface in an upright position. Once dry reassemble the turbine and it will be ready for use.
The MIR Turbine does not require calibration
The MIR range of Spirometers use a digital turbine flow meter working on the infrared interruption principle. The turbine system is made up of the following elements:
- A turbine tube, made from a special polycarbonate material, which is permeable to infrared light,
- Two deflectors, one at each end of the tube (entry and exit) made from the same polycarbonate material, which serve to create the "swirl" effect of the air passing through the tube, and a moving part or rotor, consisting of a blade plus a metal axis.
Two sets of infrared transmitters (TX) and receivers (RX) detect the rotation of the rotor within the tube and generate digital impulses, the number of these impulses is directly proportional to the velocity of the air (inspired or expired) passing through the tube. This velocity is a function of the physical form of the two deflectors, and the form of the deflectors cannot change during normal use.
The maximum velocity of the rotor, for flows generated during normal Spirometry testing, is around 1000 revolutions per second. The metal axis is made from a special alloy and it is supported at each end by a bearing made from a synthetic sapphire. This specification excludes the possibility of modifications in the response of the turbine due to wear in the turbine mechanism.
In addition, it is very important to underline that, unlike the other kinds of flow meter such as those based on pressure, the measurements made with this mechanical flow meter are NOT influenced in any way by the ambient conditions ie temperature, pressure, humidity and density (or viscosity) of the gas being measured.
Given all of the above, it can be be deduced that in normal conditions and with the flow meter undamaged, the measurement depends only and exclusively on the velocity of the air in transit through the turbine tube.
The only way in which the measurement can change would be by the presence of some kind of "foreign body" within the turbine tube, such as a hair, thread or sputum. This could create a kind of friction which could slow down or even stop the normal rotation of the rotor within the turbine tube.
In order to ensure the absence of such friction, MIR Spirometers use a software algorithm which constantly analyses the movement of the rotor and within a certain range of very low flow the device gives a feedback of an acoustic signal "beep" when the flow is within this range, thus ensuring that the rotor is moving freely and without any such friction.
Thanks to this constant acoustic feedback before, during and after every Spirometry test, the user is able to guarantee the correct functioning of the flow measurement system. Of course, the user is also able to use any normal system (pump, calibration syringe etc), to check the correct functioning of the system.
Call us today – 0800 436 324 – or email sales@emech.co.nz for a full information pack
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