Structure of GasLab Q2
4
GasLab Q2
G a s Q u a l i t y A n a l y z e r
Page 21 of 135
4.1 Instrumentation area
The instrumentation area contains gas-bearing parts and can be divided into the 2 functional
modules GASM (Gas Management) and SENS (Sensor Device).
The GASM area consists of the gas lines in the functional housing partand of the gas channel
switching, the double-block-and-bleed-valve block. The SENS area is built of a block (sensor
block) with a pressure regulator and sensors and performs the physical measurement.
All these parts are located inside the device, and are therefore invisible for the users. Only the
interfaces of the functional housing part are visible. As a result, only the functions of these parts
are described.
Figure 4.2: Functional housing part
The figure shows the lower
housing
part
of
the
gas
management area. It includes
drilled tubes and ducts in the
aluminum body for connecting,
distributing and transporting the
gas. The gas to be analyzed is
supplied via a gas channel to a
valve block.
There are two gas inlets and
outlets. The gas inlets are for
process gas and operational
calibration gas. The gas outlets
are for exhaust gas and bypass
gas.
The gas inlet for the process gas
(left side from front view)
includes an integrated particle
filter. This inlet can be connected
to test gases for verification (test-
gas-measurement) purposes
.
A bypass for the process gas can be optionally opened, to speed up the sampling and shorten
the reaction time, for example if long supply lines are used. The gas flow in the bypass is shown
by the left embedded flowmeter and regulated with the left needle valve (highlighted in yellow in
Figure 4.2).
The analyzed gas stream starts on the gas inlet (highlighted in green) and returns via sensor and
valve block (see below) into the lower housing part. The right embedded flowmeter and the right
needle valve are used to regulate and indicate the exhaust stream of measured gas
(highlighted
in blue).
The outflowing gas from the bypass and measuring equipment is removed via the gas outlets in
separate exhaust tubes. The flow indicators are used simultaneously for a visual check of the Q2.
A double-block-and-bleed valve block (DBB) with 2 channels supplies the process or the
calibration gas to the sensor block. Each gas channel is closed with two solenoid valves.
A gas channel to the vent is built in between the valves. This DBB technology reliably prevents
the contamination of the calibration and test gases, even when there are leaks in the valves.
