Fluke Biomedical VT Mobile Getting Started - Manual (Page 25)

Gas Flow Analyzer
Measuring Low Pressure
15
Using the Temperature and Relative Humidity
Sensor
Use the optional Temperature and Relative Humidity
Sensor to compensate for the conditions of the gas under
test.
Checking the Barometric Pressure
An internal sensor measures barometric pressure. The
Analyzer displays pressure relative to barometric
pressure (gauge pressure). Press S
Æ E to
check the barometric pressure reading.
To set a different barometric pressure, you can press
F and then enter that value with the text entry keys.
Note
The Analyzer relies on ambient barometric
pressure. Do not set for airport barometric
pressure, which is corrected for altitude.
Measuring Low Pressure
Measure low pressure in the range: -20 to 120 cmH
2
O.
Never exceed an absolute maximum of 5 psi.
Refer to Figure while following these steps:
1. Press R and follow on-screen instructions.
2. At the Analyzer, connect the Low-Pressure Adapter
to the Flow/Low-Pressure Port.
3. Press L in the OTHER MEASUREMENTS or
WAVEFORM SCREENS section.
4. Verify that the screen displays Low Pressure (Plo) or
LPress. If the High Pressure Adapter is also
connected, you may need to press L a second
time.
5. Connect the Low-Pressure Adapter to the source.
6. Apply pressure.
7. Successively press G (Units) to select a pressure
unit in the sequence: PSI Æ kPa Æ Bar Æ mBar Æ
ATM Æ inH2O Æ InHg Æ cmH2O Æ mmHg.
If the waveform is too small or too large, press F
(Rescale) to view the waveform within optimized limits.