View and design
2
gas-lab
Q1
Page 5
2 Device view and design
2.1 Sensor system
The actual sensor technology of the
gas-lab
Q1, the sensor system, is mounted
in an explosion-proof housing. The gas is supplied at approximately 80 mbars
overpressure and via a double block & bleed solenoid valve set, which is also
located inside the housing. There are a total of three gas inlets for different
gases, one connection for the process gas and two connections for calibration
gases. The out flowing gas is led via a vent gas line.
The housing is mounted on a mounting plate in such a way that the gas and
other process connections point downwards. In order to ensure that the housing
withstands the maximum permissible inside pressure of 1,100 mbars, a
breather
is led out of the housing at the top. The following illustration shows the front of
the sensor housing:
breather
EEx-d junction
(voltage supply,
data connection)
3: Calibration gas connection (i.e. N2, H2-11K, L1-8K)
2: Calibration gas connection (methane)
1: Process gas connection
Vent gas line