EtCO2 Maintenance 2: Maintenance
27
To set the Ambient Pressure:
1 Use Ta bl e 3 or obtain a reliable measurement of local atmospheric pressure by using a barometer or
by getting the local atmospheric pressure data from the Internet, local airport, or weather station
located at the same altitude as your facility.
Some of the weather stations may provide pressure values normalized to the sea level; be sure to use
the value for your altitude.
2 Enter the Service Mode and select EtCO
2
to access the EtCO
2
maintenance menu.
3 Select Set Ambient Pressure.
4 Rotate the Smart Select Knob to set the pressure.
Table 3 Approximate Ambient Pressure at Different Altitudes
Altitude above the Sea Level Ambient Pressure
(mmHg)
Comment, Example
meters feet
5000 16400 400 DFM100 lower pressure limit
4200 13800 450 El Alto, Bolivia
3250 10700 500 La Paz, Bolivia
2700 8850 540 Bogota, Columbia; Quito, Ecuador
2300 7540 570 Addis Ababa, Ethiopia; Mexico City, Mexico
1900 6230 600
1550 5100 630 Nairobi, Kenya
1170 3840 660 Calgary, Alberta;Yerevan, Armenia
810 2660 690
Mean land elevation. 90% of the world
population live below this altitude.
690 2260 700 Almaty, Kazakhstan; Madrid, Spain
570 1870 710 Bern, Switzerland; Tbilisi, Georgia
460 1500 720 Munich, Germany; Zurich, Switzerland
340 1100 730
220 720 740 Delhi, India; Lahore, Pakistan; Vienna, Austria
110 360 750 DFM100 default value; Seoul, Korea
0 0 760 low-rise building on a seashore; Beijing, Berlin,
Paris
-100 -330 770
-210 -690 780 Tiberias, Israel
-320 -1050 790
-650 -2100 820
-950 -3100 850 DFM100 upper pressure limit
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