Siemens 7MB1943-2AC51 Microwave Moisture Analyzer Sensor

Start by obtaining a representative sample for laboratory analysis using a standardized method like loss-on-drying to determine the reference moisture value. Access the calibration menu on the local display or via HART communicator and enter the reference value while the sensor measures the same product stream. For best results, perform a two-point calibration across your typical operating range to establish an accurate correlation curve.

The SITRANS WS100 is suitable for a wide range of solid bulk materials including plastics pellets, food powders, grains, cereals, minerals, chemicals, and pharmaceutical raw materials. It is effective where water is the primary polar molecule but is not suitable for liquids or gases. The material must flow past the sensor face for continuous reading.

Unstable readings often indicate uneven material flow, bridging, or empty pipe conditions. Another common cause is material buildup on the active sensor surface, which distorts the microwave field. Electrical interference from nearby motors can also cause noise; ensure signal cabling is properly shielded and routed away from power lines.

Yes, the 7MB1943-2AC51 model holds ATEX and IECEx certifications for hazardous areas with potentially explosive dust or gas atmospheres. You must adhere to specific installation parameters, including using correctly certified intrinsic safety barriers. All wiring practices must conform to the standards for the designated hazardous area classification.

Microwave resonance measures dielectric properties in the entire material volume, offering higher penetration depth and less sensitivity to surface effects or color. NIR measures light absorption primarily on the surface and can be influenced by texture and particle size. Microwaves are better for homogeneous bulk solids, while NIR might be preferred for thin layers or specific chemical bond analysis.