Do not allow dust or foreign bodies to enter the turbine sensor, in order to avoid incorrect functioning and possible damage. The
presence of any impurities (such as hair, sputum, threads etc.) within the body of the turbine sensor may seriously compromise
the accuracy of the measurements.
Notes about calibration of reusable turbine
WARNING
The turbine flow sensor does not require calibration but needs only a regular cleaning. If a calibration must be made then
the following guidelines should be carefully noted.
Calibration can be made using a siring a calibration syringe ad making a FVC test.
In line with the publication "Standardised Lung Function Testing" of the European Respiratory Society (Vol 6,
Supplement 16, March 1993), the air expired from the mouth is at a temperature of circa 33/34 °C.
The expired flow and volume, to be converted to BTPS conditions (37 °C) must be increased by 2.6% - this is derived
from the BTPS factor of 1.026 at a temperature of 33°C, which represents a correction of 2.6%. In practice the BTPS factor
for the expired flow and volumes is therefore constant and equal to 1.026.
For the inspired volumes and flows, the BTPS factor depends upon the ambient temperature as the air inspired is at
ambient temperature.
For instance at an ambient temperature of 20°C with relative humidity at 50%, the BTPS factor is 1.102, a correction of
+10.2%.
The correction of the inspired volumes and flows is made automatically as the machine has an internal temperature
sensor; the BTPS values are thus calculated.
If a 3L syringe is used to make the calibration and if the MiniSpir is calibrated correctly then the FVC (syringe) value will
be:
3.00 (FVC) x 1.026 (BTPS) = 3.08 L (FVC at BTPS).
If the ambient temperature is 20°C, the FIVC (syringe) value will be:
3.00 (FIVC) x 1.102 (BTPS) = 3.31 L (FIVC at BTPS).
The user must be aware that the volume of the syringe shown by the machine is converted to BTPS conditions, so that
the "increase" of the results with respect to the expected values does not constitute an error.
For instance, if the calibration procedure is carried out with measured data:
FVC = 3.08 L and FIVC = 3.31 L at an ambient temperature of 20°C the resulting correction factor becomes:
EXPIRATION .00%
INSPIRATION .00%
This does not represent an error, but is a logical consequence of the explanation detailed above.
1.2.3 Mouthpiece
Any disposable mouthpieces included with the device are supplied only as a guide to the correct type and dimensions of the
mouthpiece required for this device, they are clean but not sterile. To purchase appropriate mouthpieces, generally either paper
or plastic but in any case mono-use/disposable, we suggest that you contact your local distributor who supplied the spirometer.
WARNING
The use of a mouthpiece made from an inappropriate material could modify the bio-compatibility and could be the cause
of an incorrect functioning of the device and thus of incorrect test results, and create inconvenience to the patient.
The user is responsible for obtaining the correct type of mouthpieces for the device. Those required are a standard type with an
outside diameter of 30 mm, they are commonly used and in general easily procured.
To avoid contamination of the environment, caused by the disposal of used mouthpieces, the user must follow all of the
relevant local regulations in force.
1.2.4 USB Connection Cable
Incorrect use or application of the USB cable may produce inaccurate measurements, which will show very inaccurate values of
the patient’s condition. Carefully inspect each cable before use.
Do not use cables that appear to be or are damaged. If a new cable is required, contact your local distributor.
Use only cables supplied by MIR, specifically designed to be used with MiniSpir. The use of other types of cables can lead to
inaccurate measurements.
1.2.5 Device
WARNING
The maintenance operationsdetailed in this manualmust be carried out to the letter. If these instructions are not followed
this can cause measurement errors and/or an incorrect test interpretation.
Any modifications, adjustments, repairs or reconfiguration must be made by the manufacturer or by personnel
authorised by the manufacturer. In case of problems, never attempt to make a repair oneself. The set-up of configurable
