MMS35-621-1-000 is built with high-precision digital processing circuit, specially designed to cooperate with model 160095 and other original sensing probes. The host automatically receives raw capacitance signals from the probe, and completes built-in temperature compensation, curve fitting and data conversion to output accurate dew point value and ppmv moisture concentration data. The device is equipped with a backlit local display screen and membrane operation keys, supporting on-site parameter setting, calibration record query and measurement data viewing for field maintenance personnel. The instrument retains isolated 4–20mA analog output for data uploading to DCS and paperless recorders, and carries multiple relay alarm points which can be freely set for high dew point fault interlock to protect downstream pneumatic instruments and process pipelines from moisture erosion damage.

The overall casing adopts dustproof and moisture-proof panel embedded structure, suitable for installation in central control cabinets and on-site local instrument boxes. The internal circuit undergoes anti-interference optimization design, which can resist electromagnetic noise generated by surrounding inverters and high-power equipment, ensuring stable measurement effect in complex industrial electromagnetic environments. The applicable ambient working temperature ranges from 0 °C to 55 °C, and it can run stably for 24 hours unattended under 95% non-condensing humidity for long-term online monitoring tasks of compressed air, natural gas and inert gas pipelines. Each controller is calibrated against NIST-traceable standard equipment before factory delivery, and undergoes continuous power aging inspection to stabilize circuit performance and reduce later zero drift.

Long-term operation will cause probe pollution and host parameter drift, resulting in deviation of measured moisture data, which easily leads to excessive water vapor corrosion inside pipelines and abnormal failure of precision control components. Replacing with qualified original MMS35 controller and matched probes can rapidly restore the measurement accuracy of the moisture monitoring system and shorten equipment maintenance downtime. New controllers are applied to the construction and upgrading of gas drying monitoring systems, while spare controllers are used for daily replacement and backup of on-line monitoring equipment. Accurate moisture monitoring data can effectively reduce the operating energy consumption of drying dryers, lower pipeline maintenance costs caused by corrosion, and provide reliable monitoring guarantee for safe and stable operation of industrial gas supply systems under long-cycle continuous production conditions.