4
Structure of GasLab Q2
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G a s Q u a l i t y A n a l y z e r
GasLab Q2
4.2.1 Gas connections and breathers
The Q2 is equipped with several gas connections with different functions.There are two gas inlets,
and two gas outlets. Two breathers are used for atmosphere pressure compensation between
inside and outside the device. The interface of the gas ports is always a tube fitting with 6 mm,
¼
” . They are always equipped by Elster, in the standard version Swagelok connectors are used.
The required tubing should be permanently attached. An overview of all gas connections and
breathers is given below:
Connection
Description
Notes
Left gas
inlet
Process gas or
verification gas
The inlet pressure of the process gas or verification gas must
be between 0.15 MPa and 0.5 MPa (gauge).
Right gas
inlet
Operational calibration
gas
The inlet pressure of the operational calibration gas must be
0.2 MPa (gauge) ±0.05 MPa.
Left gas
outlet
Exhaust gas of
integrated bypass
Max. 300 l/h, tube fitting 6 mm or ¼”; inner tube diameter must
be 4 mm at least
Right gas
outlet
Exhaust gas of
measurement
Default 30 l/h, maximum 60 l/h; tube fitting 6 mm or ¼”; inner
tube diameter must be 4 mm at least
Main
breather
Vent of instrumentation
housing
If an optional vent tube is connected via the
¼” NPT thread it
must have a minimum ID of 8mm.
A complete separate tubing in required.
!Observe the length specifications in section 2.4!
Rear
breather
Vent of connection box
Vent tubing is not required and not possible
There is an internal particle filter behind the tube fitting for the process gas. The right inlet is only
connected to the operational calibration gas cylinder. The breathers must not be closed or blocked
e.g. by water, ice, insects, condensation, dirt or something else, or the pressure compensation
will be imperiled.
WARNING:
DO NOT CONNECT THE MAIN BREATHER TO OTHER GAS VENTS!
PRORECT BREATHERS AGAINST ANY KIND OF RESTRICTION
For more information,
see chapter 5.3.1
