Shaw SADP-D Portable Dew Point Meter

Overview

The Shaw SADP-D Portable Dew Point Meter is a field-deployable, intrinsically safe moisture analyzer engineered for high-reliability dew point measurement in compressed air, industrial gas streams, and ambient atmospheric applications. It employs a proprietary electrolytic (phosphorus pentoxide, P₂O₅) sensing principle—where water vapor is quantitatively dissociated at an anode and recombined at a cathode—enabling trace-level detection with electrochemical specificity and long-term stability. Unlike capacitive or chilled-mirror technologies, the P₂O₅ cell delivers consistent sensitivity across the full -100 °C to +20 °C dew point range without condensation risk or optical surface contamination. Designed for operation at ambient pressure, the SADP-D eliminates the need for pressure regulation or flow controllers, making it ideal for rapid spot-checks in maintenance, commissioning, and quality assurance workflows across oil & gas, pharmaceutical manufacturing, electronics, and power generation sectors.

Key Features

• Intrinsically safe certification to ATEX II 2G Ex ia IIC T4 Ga and IECEx EXA 22.0001X—enabling direct use in Zone 0/1 hazardous areas without external barriers or isolators
• Integrated desiccant-dried test chamber that maintains sensor dryness between measurements, ensuring immediate readiness and eliminating pre-conditioning delays
• AutoCal™ self-calibration function that verifies baseline stability prior to each measurement cycle, enhancing measurement integrity and reducing operator dependency
• Large backlit LCD display with dual-unit capability (°C/°F), optimized for readability under low-light or outdoor conditions
• Ruggedized mechanical architecture: shock-absorbing leather carry case with integrated shoulder strap, PTFE-coated sampling hose resistant to hydrocarbons and aggressive gases
• Long-duration battery operation (>150 hours on standard C-cell alkaline batteries), supporting extended field campaigns without recharging infrastructure

Sample Compatibility & Compliance

The SADP-D is validated for use with non-corrosive, non-condensing gas matrices including compressed air, nitrogen, argon, helium, and instrument air. It is not intended for use with reactive gases (e.g., chlorine, ammonia), solvent vapors, or high-CO₂ streams (>5% v/v) without prior validation. All units ship with a factory-issued calibration certificate traceable to UK National Physical Laboratory (NPL) and NIST humidity standards, satisfying ISO/IEC 17025 requirements for metrological traceability. The device complies with EN 60079-0 and EN 60079-11 for intrinsic safety, and supports GLP/GMP documentation protocols through its audit-ready calibration history and stable sensor response characteristics.

Software & Data Management

While the SADP-D operates as a standalone instrument without mandatory software, optional PC interface kits enable data logging via RS-232 or USB-to-serial adapters. Logged datasets include timestamped dew point values, ambient temperature, battery status, and AutoCal™ diagnostic flags. Exported CSV files are compatible with LIMS platforms and comply with FDA 21 CFR Part 11 when used with validated electronic signature workflows. Firmware updates—delivered via Shaw’s secure customer portal—maintain alignment with evolving IEC 61508 functional safety guidelines and EN 61000-6-3 EMC standards.

Applications

• Verification of dryer performance in compressed air systems per ISO 8573-1:2010 Class 2–4 moisture specifications
• Pre-commissioning moisture checks in natural gas transmission pipelines and LNG dehydration units
• Monitoring purge gas dryness in semiconductor fabrication tool enclosures
• Field validation of desiccant and membrane dryers in pharmaceutical clean utilities
• Root-cause analysis of corrosion or valve freezing incidents linked to elevated water content
• Supporting ISO 8573-3 particle/moisture co-validation studies in critical process air networks

FAQ

What gases can be measured with the SADP-D?

The instrument is validated for dry, non-reactive gases such as compressed air, nitrogen, argon, helium, and CO₂-lean instrument air. Avoid exposure to halogenated solvents, ammonia, hydrogen sulfide, or high-concentration CO₂.
Is recalibration required before each use?

No—AutoCal™ performs automatic zero verification prior to measurement; however, periodic recalibration every 12 months (or after 2000 operating hours) is recommended per ISO/IEC 17025 best practices.
Can the SADP-D measure below -60 °C dew point?

Yes—the electrolytic sensor maintains linearity and resolution down to -100 °C, with no cold-trap formation or signal drift typical of chilled-mirror instruments.
Does the unit require flow control or pressure regulation?

No—it operates at ambient pressure with unrestricted sample flow; typical recommended flow rate is 0.5–2 L/min, but no active regulation is necessary for accuracy.
How is traceability documented?

Each unit includes a NIST- and NPL-traceable calibration certificate listing uncertainty budgets, reference standards used, and environmental conditions during calibration.