PhyMetrix DPT-810 Series Online Dew Point Transmitter

Overview

The PhyMetrix DPT-810 Series Online Dew Point Transmitter is a high-stability, field-deployable dew point analyzer engineered for continuous moisture monitoring in compressed air, industrial gas streams, and critical process environments. It employs a proprietary nanoscale microporous metal oxide sensing film—capacitively coupled to a precision signal conditioning circuit—to deliver trace-level water vapor detection across an exceptionally wide dew point range of −110 °C to +20 °C. Unlike chilled-mirror or aluminum oxide sensors, this capacitive thin-film architecture offers inherent immunity to condensation-induced hysteresis, minimal drift over extended operation, and stable performance under variable flow (>1 LPM) and pressure (up to 6 bar) conditions. Designed for integration into distributed control systems (DCS), PLCs, and SCADA networks, the DPT-810 operates as a true two-wire loop-powered device, eliminating the need for auxiliary power supplies while maintaining galvanic isolation and reverse-polarity protection.

Key Features

• Ultra-wide measurement range: −110 °C to +20 °C dew point temperature, suitable for deep-dry applications such as SF₆ insulation gas monitoring and semiconductor purge lines
• Capacitive polymer/metal oxide sensor with nanoscale microstructure ensures long-term stability and resistance to chemical contamination (e.g., hydrocarbons, siloxanes)
• IP68-rated 316 stainless steel housing with hermetically sealed 3/4″–16 UNF process connection; rated for outdoor, washdown, and hazardous-area installations (ATEX/IECEx variants available)
• True two-wire 4–20 mA analog output (20–28 VDC supply), compliant with NAMUR NE43 fault signaling standards
• NIST-traceable calibration certificate supplied with each unit; optional on-site recalibration support per ISO/IEC 17025-accredited procedures
• Configurable display units: °C (dp), ppm_v, g/m³, or relative humidity (RH) — user-selectable via HART interface or local configuration tool
• Response time ≤180 s to 95% of step change under nominal flow conditions (≥1 LPM), verified per ISO 8573-4 Annex B test protocol

Sample Compatibility & Compliance

The DPT-810 is validated for use with non-corrosive, non-particulate gas matrices including compressed air, nitrogen, argon, oxygen, hydrogen, natural gas (dry), SF₆, and medical-grade gases. It is not recommended for direct installation in streams containing aerosols, liquid water carryover, or high concentrations of acidic or oxidizing compounds (e.g., Cl₂, NOₓ) without upstream filtration and coalescing. The instrument complies with CE marking requirements under the Electromagnetic Compatibility (EMC) Directive 2014/30/EU and Low Voltage Directive 2014/35/EU. Optional explosion-proof configurations meet ATEX II 2G Ex db IIB T4 Gb and IECEx Ex db IIB T4 Gb standards. All factory calibrations are performed against NIST-traceable chilled-mirror reference standards per ASTM D6304 and ISO 8573-4 protocols, supporting GLP/GMP documentation requirements.

Software & Data Management

While the DPT-810 operates autonomously via its 4–20 mA output, optional HART 7 digital communication enables remote parameter configuration—including engineering unit selection, damping adjustment (0–60 s), zero/span verification, and diagnostic status reporting (sensor health, loop integrity, temperature compensation status). Integration with asset management platforms (e.g., Emerson DeltaV, Honeywell Experion, Siemens Desigo) is supported through standard HART-IP or Modbus TCP gateways. Audit trails, calibration logs, and firmware revision history can be exported for FDA 21 CFR Part 11-compliant recordkeeping when deployed with validated electronic logbook systems.

Applications

• Power generation: Monitoring moisture in turbine inlet air, hydrogen-cooled generator purge gas, and SF₆ circuit breaker insulation gas
• Pharmaceutical manufacturing: Ensuring dryness compliance in fluidized bed dryers, lyophilizer chambers, and nitrogen blanketing systems per USP and EU GMP Annex 1
• Petrochemical refining: Real-time dew point verification in fuel gas streams, amine regeneration off-gas, and catalyst protection lines
• Aerospace & defense: Moisture control in aircraft pneumatic systems, avionics cooling loops, and composite curing ovens
• Industrial gas production: Quality assurance for bulk nitrogen, argon, and helium deliveries per ISO 8573-1 Class 1–4 specifications
• Medical device sterilization: Validation of ethylene oxide (EtO) and hydrogen peroxide vapor (HPV) chamber dryness prior to cycle initiation

FAQ

What is the recommended installation orientation for the DPT-810?

Mount the transmitter vertically with the process connection pointing downward to prevent condensate accumulation in the sensor chamber.
Does the DPT-810 require periodic zero/span adjustment?

No routine adjustment is required under stable operating conditions; however, annual verification against a traceable reference standard is recommended per ISO/IEC 17025 quality systems.
Can the output be configured for ppm_v instead of °C (dp)?

Yes—unit conversion is fully configurable via HART interface and applies real-time temperature and pressure compensation per ISO 6245.
Is the sensor susceptible to poisoning by silicone vapors or oil mist?

The nanoscale metal oxide film exhibits superior resistance to silicone contamination compared to traditional Al₂O₃ sensors; however, a 1 µm coalescing filter is advised upstream in lubricated compressor applications.
What certifications accompany shipment?

Each unit ships with a NIST-traceable calibration certificate, CE Declaration of Conformity, RoHS compliance statement, and mechanical drawing package.