The Vaisala DRYCAP® Miniature Dew Point Transmitter, model code DMT143 L1C1A1A312ASX, is a premier technological solution engineered by Vaisala (Finland) specifically designed for OEM system integrators and demanding industrial plants requiring continuous, ultra-reliable low dew point surveillance in compressed air networks. Characterized by its miniature form factor, lightweight design, and rugged AISI 316L stainless steel enclosure with IP66 protection, the DMT143 easily integrates into exceptionally tight spaces within industrial desiccant air dryers, pressurized distribution manifolds, and specialized process equipment.

At the core of the transmitter is Vaisala's patented DRYCAP® 180M thin-film polymer sensor paired with an intelligent auto-calibration algorithm. Unlike conventional aluminum oxide sensors that suffer from long-term sensor drift or permanent failure when saturated with moisture, the DRYCAP® sensor completely withstands liquid water condensation. In scenarios where catastrophic system shutdowns cause pipeline moisture surges, the DMT143 recovers automatically and rapidly resumes pinpoint precision once dry airflow is re-established. The sensor demonstrates outstanding immunity to compressor oil vapors, airborne particulates, and common industrial chemicals, while extending typical recalibration intervals to 2 full years, drastically slashing operational expenditures and scheduled plant downtimes.

The specialized configuration DMT143 L1C1A1A312ASX is factory-optimized for atmospheric air processes at 1 bar absolute pressure. It delivers high-resolution analog signaling scaled from -80 °C to +20 °C Td (4...20 mA with a 3.6 mA fault diagnostic state), alongside an integrated RS485 serial communication port supporting both Modbus RTU and Vaisala Industrial Protocols for seamless PLC and supervisory SCADA connectivity. This turnkey assembly comes completely outfitted with an ISO G1/2" mechanical long probe, an HM47280SP sintered stainless steel protective filter cap, a 3.0-meter shielded connection cable with open leads (HMP50Z300SP), and an ISO G1/2" dedicated sampling cell with 1/4" male connectors, providing an out-of-the-box, plug-and-play measurement package without demanding custom machining or additional piping modifications.

• Manufacturer: Vaisala Oyj
• Origin: 100% Finland
• Product Series: Miniature Dew Point Transmitter
• Model / Configuration Code: DMT143 L1C1A1A312ASX
• Sensing Element: Vaisala DRYCAP® 180M (Polymer thin-film capacitive sensor)
• Patented Feature: Continuous on-line auto-calibration and rapid condensation recovery
• Typical Dew Point Measurement Range: -70 °C to +60 °C Td
• Factory Scaled Analog Output Range: -80 °C to +20 °C Td
• Measurement Accuracy: ±2 °C Td (in compressed air or nitrogen)
• Response Time (63% [90%]): 5 s [15 s] (from -60 °C to -20 °C Td)
• Maximum Operating Pressure: Up to 50 bar absolute (Optimized accuracy calibrated at 1 bar absolute)
• Process Gas Compatibility: Compressed air and non-corrosive industrial gases
• Analog Signal Output: 4 ... 20 mA (3-wire configuration), 3.6 mA fault indication state
• Digital Serial Interface: RS485 (Supports Modbus RTU and Vaisala Industrial Protocol)
• Alarm LED Indicator: Configured to Off for normal operation, illuminates exclusively for diagnostic fault indication
• Mechanical Process Connection: ISO G1/2" Thread (Long Probe Configuration)
• Sensor Protection: HM47280SP Sintered stainless steel filter
• Connection Cable: 3.0-meter (9.8 ft) industrial shielded cable with open lead wires (P/N: HMP50Z300SP)
• Sampling Cell Accessory: Dedicated stainless steel sampling cell for ISO G1/2" thread with 1/4" male fittings
• Housing Material: AISI 316L Stainless Steel
• Enclosure Protection Class: IP66 (NEMA 4)
• Operating Temperature Range: -40 °C to +60 °C (-40 °F to +140 °F)
• Operating Supply Voltage: 18 ... 28 VDC (required for 4-20mA current loop)
• Recommended Calibration Interval: 2 years
• Applicable Industries: Desiccant and refrigeration compressed air dryers, semiconductor cleanrooms, electric vehicle (EV) battery manufacturing, PET bottle blow molding, medical breathing air supply, pharmaceutical clean environments, additive manufacturing (3D metal printing), and food & beverage processing.