The Danfoss IXA Marine Emission Sensor (MES 1001) is developed with a pure maritime focus. This means that the sensor can operate in the harsh maritime environment, is easy to install, easy to operate, and easy to maintain.
The sensor offers a variety of interfaces, including Modbus/TCP-IP, Analog Out (4-20 mA) and RS-485 for GPS data.
When the pre-installation work has been carried out, the MES 1001 is easily installed in approx. 1 hour. The sensor is mounted on a standard flange, which is welded on to the exhaust system. Standard 24VDC power from the vessel is connected to the sensor, a data cable and compressed air, and the sensor is up running.
The MES 1001 is designed for easy operation. The technical crew on board a vessel has many jobs to see to. However, MES 1001 is not one of them, as it practically operates on its own. There is no need for connecting bottles with reference or span gases, as the sensor automatically self-calibrates. The sensor has a variety of connection possibilities and can be operated by the display or remote service tool.
This means a reduction in costs as there is no need for special crew training.
There are no moving parts in the sensor and no filters to change. The UV lamp box is the only consumable part, which must be changed after receiving a predictive maintenance warning a couple of weeks in advance. The replacement of the UV lamp is very simply done by releasing the box and replacing it with a new one. Replacement of the UV lamp box is done every 12-14 months depending on the frequency of measurements.
The easy maintenance and low maintenance rate reduces the need for spare parts, thus reducing maintenance costs.
The technology behind the sensor
The sensor is based ultra violet absorption spectroscopy. This means that ultraviolet light is emitted into the gas and a detector (spectrometer) measures the amount of light absorbed by the gas. The sensor’s computer contains a digital library with the “fingerprints” of the supported gasses and by comparing the what we “see” with the reference library, we are capable of calculating the exact concentration. The emission of ultraviolet light takes place in the probe.
The probe contains a complex mechanical design which together with the flow of clean compressed ensures that the delicate optical components is not contaminated by e.g. soot particles. The same air system is also responsible for dragging the exhaust past the measurement point inside the probe. The sensor offers a unique “zeroing” scheme which uses the compressed air to evacuate the probe from exhaust gas and this means drifting parameters practically can be eliminated.
The sensor measures the four gasses NO, NO2, SO2 and NH3 at the same time and the measurements are reported on one or more of sensor’s outputs. The outputs can either be Modbus TCP/IP or analogue.