Saadat ALBORZ B9, Operator'S Manual

Page: 264 / 302

Chapter 22:Technical Specifications User Manual
22-7
N2O ±(2 kPa + 5% of reading)
Agents
5
±(0.2 kPa + 10% of reading)
Gas concentration conversion
Gas concentration is reported in units of volume percent. The concentration is defined as:
The total pressure of the gas mixture is estimated by measuring the actual atmospheric pressure in
the IRMA probe.
Effects from water vapor partial pressure on gas readings
The effects of water vapor are illustrated by the examples in the following table. The two columns to
the right show the relative error in displayed concentrations when adding or removing water vapor
from the gas mixture, and referencing the measurement to dry gas conditions at actual temperature
and pressure (ATPD) or saturated conditions at body temperature (BTPS).
Temp [C]
RH [%] P [hPa] H2O part.pres.
[hPa] errrel [%] errrel ATPD
[%] errrel [%]
BTPS
10 20 1013 2 0 -0.2 +6.0
20 20 1013 5 0 -0.5 +5.7
25 0 1013 0 (ATPD) 0 0 +6.2
25 23 1013 7.3 0 -0.7 +5.5
25 50 1013 16 0 -1.6 +4.6
30 80 1013 42 0 -4.1 +2.0
37 100 1013 63 (BTPS) 0 -6.2 0
37 100 700 63 0 -9.0 -2.8
The table illustrates that the gas concentrations in the alveoli, where the breathing gas is saturated with water vapor at body
temperature (BTPS), are 6.2% lower than the corresponding concentrations in the same gas mixture after removal of all
water vapor (ATPD).
Interfering gas effects
Gas or vapour
Gas level CO2 Agents N2O
IRMA CO2 IRMA
AX+
N2O-note4) 60 vol% - note1&2) -
note1&2) - note1) - note1)
HAL-note4) 4 vol% - note1) - note1) - note1) - note1)
ENF, ISO, SEV-note4) 5 vol% +8% of reading-note3) - note 1) - note1) - note1)
DES-note4) 15 vol% +12% of reading-
note3) - note 1) - note1) - note1)
Xe (Xenon)-note4) 80 vol% -10% of reading-note3) - note1) - note1)
He (Helium)-note4) 50 vol% -6% of reading-note3) - note1) - note1)
Metered does inhaler propellants-note4) Not for use with metered dose inhaler propellants
C2H5OH (Ethanol)-note4) 0.3 vol% - note1) - note1) - note1) - note1)
C3H7OH (Isopropanol)-note4) 0.5 vol% - note1) - note1) - note1) - note1)
CH3COCH3 (Acetone)-note4) 1 vol% - note1) - note1) - note1) - note1)
CH4 (Methane) -note4) 3 vol% - note1) - note1) - note1) - note1)
CO (Carbon monoxide) -note5) 1 vol% - note1) - note1) - note1) - note1)
NO (Nitrogen monoxide)-note5) 0.02 vol% - note1) - note1) - note1) - note1)
O2-note 5) 100 vol% - note1&2) -
note1&2) - note1) - note1)
Note 1 : Negligible interference, effect included in the specification “ Accuracy all conditions” above.
5
The accuracy specification for IRMA AX+ is not valid if more than two agents are present in the gas mixture. If more than
two agents are present, an alarm will be set.