GE MMS35-321-1-000 belongs to the classic MMS35 series moisture probe product portfolio of GE Panametrics. The segment definition of the model code is as follows: MMS35 represents the core series platform for online gas moisture monitoring; 321 stands for customized insertion length, standard NPT threaded connection and double-layer sintered stainless steel filter assembly; the middle digit 1 corresponds to an integrated NTC thermistor for real-time medium temperature collection and measurement error correction; 000 is the factory default calibration curve parameter matched with standard trace moisture gas sources. When paired with MTS5 dew point transmitters, Moisture.IQ signal converters and PM880 portable hygrometers, it forms a complete set of gas humidity continuous monitoring system.

The core detection component is a high-stability nickel-based alumina sensitive chip. Water molecules permeate the surface gold film and are adsorbed in the micropores of the alumina substrate, producing linear capacitance changes corresponding to water vapor partial pressure. The host converts the capacitance signal into intuitive measurement values including dew point temperature, ppm moisture content and absolute humidity through internal operation algorithms. The effective measuring range covers -110°C to +60°C dew point, fully meeting the detection requirements of ultra-dry compressed air, nitrogen, hydrogen, natural gas, SF6 insulating gas and inert protective gas in semiconductor manufacturing, power industries, fine chemicals and gas separation industries. The built-in temperature compensation circuit can automatically offset measurement drift caused by pipeline and ambient temperature fluctuations, effectively ensuring data accuracy under 24-hour uninterrupted online operation conditions.

All parts in contact with process gas are made of seamless welded 316 stainless steel, with a maximum rated working pressure up to 345 bar, adapting to medium and high-pressure gas gathering pipelines and industrial pressure process pipelines. The front double-layer sintered metal filter can efficiently block solid particles, oil mist and condensed liquid droplets in airflow, avoiding contamination and abrasion of the fragile alumina sensing wafer and effectively prolonging the service life of the sensing core. The overall probe body adopts full sealing potting technology, with excellent moisture resistance and weak corrosion resistance, and can operate stably for a long time in humid pipe galleries, outdoor compressor stations and chemical plant instrument areas.

Multi-layer copper braided shielding is wrapped around the internal signal transmission wire harness, which can effectively resist electromagnetic interference generated by field compressors, frequency converters and high-power distribution equipment, realizing low-loss and stable long-distance cable signal transmission. The terminal adopts a general aviation plug interface with plug-and-play characteristics. Maintenance personnel can complete disassembly, replacement and on-site calibration without modifying the original system wiring layout, greatly reducing equipment maintenance time cost.

Each MMS35-321-1-000 probe passes strict zero point calibration and span calibration with NIST-traceable standard moisture gas before delivery, and complete calibration documents are provided for factory filing and third-party inspection audit. There are no wearable mechanical structures inside the probe. Conventional daily maintenance only needs regular pipeline purging treatment and annual calibration verification according to the cleanliness of on-site gas medium. When the sensing performance declines, users only need to replace the internal sensitive chip instead of the whole probe, which greatly reduces the enterprise's spare parts procurement cost.

The probe is designed with intrinsic safety structure. When used together with certified safety barriers, it can be safely deployed in Zone 1 and Zone 2 explosive hazardous areas and complies with ATEX safety specifications. Its main application scenarios include factory dry air systems, natural gas transmission pipelines, power station SF6 gas insulation monitoring, chemical tail gas purification treatment and heat treatment furnace protective atmosphere quality detection, providing reliable data support for process safety control and gas quality management.