IMT Analytics FlowAnalyser Series User Manual page 10

Specifications
4
10
4.1.3 Principle of flow measurement
Flow in the flow channel is determined by differential pressure measurement. To build
up differential pressure a plastic screen is used to provide flow resistance.
ƞ: dynamic viscosity of the gas [Pa s]
ρ: gas density [kg/m
]
3
c1, c2: device-specific constants (channel geometry)
Dynamic viscosity
The viscosity of a medium is its resistance to the flow and shear
of the current. Viscosity is extremely dependent on temperature. The viscosity of a
medium is slightly dependent on the pressure and moisture content of the medium.
Density
Density is the unit for the mass per unit volume of the medium. Density is very de-
pendent on pressure and temperature.
The impact of ambient conditions is hence the reason why flow is occasionally con-
verted to standard conditions.
(4.2 Gas standards for flow and volume
4.1.4 Special functions
Automatic battery operation in the event of a power failure
4.1.5 Communication interfaces
USB, RS-232 port for firmware download, remote control functions and connection
to MultiGasAnalyser OR-703 (optional), trigger input (digital) for external trigger
4.1.6 Physical data
Weight: 3.7 kg
Size (l × w × h): 22 × 25 × 12 cm
Gas types: Air, O , N
2 2
mixtures: Air/O
4.1.7 Calibration by user
Offset calibration of the pressure sensors, calibration of the oxygen sensor.
measurement)
O, He, N , CO and
2 2
, N O/O , He/O
2 2 2 2
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