LION SD-400 - Page 33

lion alcolmeter
®
SD-400 User Handbook [v7]
A2.3 Breath Sampling
 Automation:
- once the subject has complied with the minimum breath sampling
requirements, a fixed volume sample of breath is drawn from the
mouthpiece and passed directly into the fuel cell for analysis.
 Breath Pressure Sensor:
- high impedance, low power, silicon wafer diaphragm differential
device, with in-built temperature compensation.
 Minimum Breath Flow Rate:
- normally set at 25 litres per minute, but variable in the range 20 to
50 litres per minute.
 Minimum Breath Pressure:
- 7.0hPa (at a flow rate of 25 litres per minute).
 Minimum Breath Discard Volume:
- normally set to 1.5 litres.
A2.4 Electronics and Microcontroller
 Breath Test Data Memory:
- 500 subject breath tests.
 Internal Battery Backup:
- internal lithium battery protects configuration and calibration.
 Communications Port:
- 2 channel, serial interface, for full RS232 data transfer to download
stored data to a PC or Apple-Mac; or to a serial dot matrix printer.
 Breath Flow Measurement:
- precise flow measuring device and timer for determination of
expired breath volume ensure automatic deep lung breath sampling.
 Digital Display:
- four digit, illuminated LCD.
 Visual Indicators:
- four coloured LED's show the current status:
WAIT, READY, FLOW or ANALYSING.
 Audible Indicator:
- beeper indicates such events as reversed breath flow (subject
suck-back), a change of indicator light status, or a fault condition.
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