8A O2 and H2O analysers
Safety
Page
8A - 2
MB-20-G/MB-200G-W_MB-LABmaster_MB-200 MOD_TP700
Operating Manual - V5.0 - 04/2018 - STD
8A.2 Safety
8A.2.1 Intended use
¡ The MBRAUN analysers are designed to monitor the inert gas atmosphere of
MBRAUN systems for residual oxygen or residual moisture concentration.
¡ An MBRAUN analyser is always used in combination with the Siemens PLC . The
Siemens PLC reads the data from the analyser to provide a display on the touch
panel and to control the system.
¡ The MBRAUN analyser can be used as a standalone measurement system in com-
bination with the optionally available MB-SSD-DIS Combi Monitor. Analysers may be
used for other applications, but this must be explicitly approved by MBRAUN.
8A.2.2 Improper use MB-OX-SE1
Improper use is defined as follows:
¡ Use of oxygen analysers in flammable or explosive atmospheres (interior and exter-
ior).
¡ Operation of oxygen analysers at oxygen levels >1000ppm (for example, in air).
Exposure to high oxygen concentrations over a longer period shortens the sensor’s
service life.
After the sensor has been exposed to air, it will take several hours before the sensor
can correctly measure low oxygen concentrations again.
8A.2.3 Improper use of the moisture analyser
Improper use comprises the use of moisture analysers in flammable or explosive atmo-
spheres (interior and exterior).
8A.3 Oxygen analyser
8A.3.1 Description
The MB-OX-SE1 analyser is designed to monitor the atmosphere of MBRAUN systems
for residual oxygen content. The measuring range is <1.0 to 1000 ppm. Over the whole
range, the analyser measures linear.
The zirconium dioxide semiconductor used in the sensor is specifically designed for oxy-
gen. Despite this, due to the high temperature and catalytic effect of the platinum elec-
trodes on the sensor, low cross-sensitivities to hydrogen and possible reactions with ag-
gressive trace gases occur. Under some circumstances these can influence the life span
of the sensor and cause increased measurement values.
The electronics and the sensor are calibrated at the factory using certified calibration gas.
The user cannot adjust the device.
Operating the sensor at oxygen levels of > 1000 ppm (e.g. in air) does not cause irrevers-
ible damage to the sensor, but it should be avoided. After the sensor has been exposed
to air, it will take several hours before the sensor can correctly measure low oxygen levels
in working gas.
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