Operating Manual
Operation instructions
Page13-8
13.4 Moisture Analyser (MB MO-SE-1)
13.4.1 General
The MB-MO-SE1 has been designed to control the atmosphere of the MBRAUN Systems for
residual moisture content. The measuring range is 0 to 500 ppm. The measuring range from
0 – 50 ppm is linear. The measurement range is calibrated for use below 500 ppm, as the
sensor output above 50 ppm, is not truly linear.
The sensor element is a “double helix” made of platinum wire fixed on a special insulation
material, or printed ceramic. The sensor is coated with phosphoric acid that is totally
dehydrated. Water molecules in the gas penetrate the acid layer and the electrolysis of the
resulting H+ and OH- ions to H2 and O2 produces an electric current. Therefore, the water
molecules coming to the sensor surface are removed and the resulting current is depending
on the concentration of the water molecules in the gas. The primary signal is compensated for
temperature and amplified.
13.4.2 Construction
The MB-MO-SE1 consists of the sensor and the special electronics separated by a gas-tight
NW40 clamp flange. The sensor is protected against physical damage by a protective cage.
The sensor leads are connected to the electronics by a vacuum-tight feed-through. The
electronics are contained in an airtight box mounted directly to the back of the NW40 flange.
Electronics and Sensor Element have been factory-calibrated with certified calibration gases;
there are no user-accessible adjustment points.
13.4.3 Technical Data
