Specifications
10
4
IMT Analytics AG
4.1.3 Principle of flow measurement
Flow in the flow channel is determinedbydifferential 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
Theviscosity of a medium is its resistance tothe flow and shear
of the current. Viscosity is extremely dependent on temperature. Theviscosity of a
medium isslightly dependent on the pressure andmoisture 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 measurement)
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
2
, N
2
O, He, N
2
, CO
2
and
mixtures: Air/O
2
, N
2
O/O
2
, He/O
2
4.1.7 Calibration by user
Offset calibration of the pressure sensors, calibration of the oxygen sensor.
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