ALPHA SS-1 / SS-2 / SS-3 / SS-4 Dew Point Sample System

Overview

The ALPHA SS-1, SS-2, SS-3, and SS-4 Dew Point Sample Systems are engineered precision sampling platforms designed for continuous, representative moisture measurement in low-pressure industrial gas streams—particularly dry compressed air, nitrogen, instrument air, and other inert or process gases used in power generation, turbine control, and critical utility systems. These systems operate on the fundamental principle of conditioned sample delivery: they maintain thermodynamic equilibrium between the process stream and the dew point sensor by precisely regulating pressure, flow rate, filtration, and thermal stability—ensuring that the sensor measures true equilibrium dew point rather than a distorted value caused by adiabatic expansion, particulate interference, or uncontrolled flow dynamics. Unlike generic sample probes, the ALPHA SS-series incorporates integrated pressure regulation, calibrated laminar flow control, and dual-stage particulate filtration to preserve measurement integrity across variable upstream conditions—making them suitable for compliance-critical applications where ISO 8573-1 Class 2 or Class 3 air quality verification is required.

Key Features

• Modular, panel-mountable architecture with corrosion-resistant 316 stainless steel tubing, fittings, and manifold components—rated for continuous operation at up to 50 barg (725 psi) inlet pressure
• Dual operational configurations: SS-1 operates at ambient pressure post-regulation (ideal for integration with AMT-series chilled-mirror or capacitive dew point transmitters), while SS-2 maintains full system pressure at the sensor interface for high-fidelity in-situ measurement under process conditions
• Integrated 0.6 µm absolute particulate filter (ISO Class 4 solid removal efficiency) upstream of the sensor port to prevent fouling and drift in hygroscopic sensing elements
• Calibrated mass flow control with visual rotameter (0–5 L/min / 0–10.6 SCFH range) and fine-tuning needle valve for repeatable, laminar sample delivery
• Dedicated auxiliary inlet port for secondary sample introduction or certified calibration gas injection—enabling traceable zero/span verification per ISO/IEC 17025 procedures
• Sample exhaust port configurable for atmospheric venting or return-to-process routing, supporting closed-loop sampling compliance in hazardous or regulated environments
• Front-panel aluminum schematic diagram with laser-etched component labeling and color-coded flow paths for rapid commissioning and maintenance diagnostics

Sample Compatibility & Compliance

The SS-series is fully compatible with AMT’s family of 4–20 mA analog dew point transmitters—including models with capacitive polymer, aluminum oxide, and chilled-mirror sensing technologies. It meets CE marking requirements and conforms to UKCA certification standards for electromagnetic compatibility (EMC Directive 2014/30/EU) and low-voltage safety (LVD Directive 2014/35/EU). When paired with appropriately certified transmitters, the complete system supports validation protocols aligned with ISO 8573-1:2010 (compressed air purity classes), IEC 61511 (functional safety for SIS), and IEEE C37.122.2 (moisture monitoring in SF₆-insulated equipment). All wetted parts comply with ASTM A269 TP316 material specifications; no elastomers or lubricants contact the sample path, eliminating outgassing risks in ultra-dry applications (< –70 °C Td).

Software & Data Management

While the SS-series itself is a hardware sampling platform (no embedded firmware or onboard software), its analog 4–20 mA output interface ensures seamless integration into existing DCS, SCADA, or PLC architectures. When deployed with AMT transmitters supporting HART® protocol (e.g., AMT-100 series), the system enables remote configuration, diagnostic readouts (e.g., sensor health status, filter delta-P alerts), and audit-trail-capable calibration logging—fully compliant with FDA 21 CFR Part 11 requirements when implemented within validated GxP or GLP workflows. Optional Modbus RTU or Ethernet/IP gateways allow centralized data aggregation and time-synchronized dew point trending across multiple sampling points in large-scale power plant or substation installations.

Applications

• Continuous moisture monitoring in turbine inlet air drying systems to prevent compressor blade erosion and icing
• In-service verification of desiccant dryer performance in instrument air networks serving control valves and pneumatic actuators
• Quality assurance sampling for SF₆ gas handling in high-voltage switchgear—ensuring moisture levels remain below 20 ppmv (–50 °C Td) per IEC 60480
• Validation of nitrogen blanketing systems in transformer conservator tanks per IEEE C57.106
• Calibration gas delivery infrastructure for field verification of portable dew point analyzers in utility maintenance programs

FAQ

What is the maximum allowable inlet pressure for the SS-2 model?

The SS-2 is rated for continuous operation at up to 50 barg (725 psi) inlet pressure, with an integrated stainless steel pressure regulator maintaining stable downstream conditions.
Can the SS-1 be used with chilled-mirror dew point sensors?

Yes—the SS-1’s ambient-pressure design is optimized for chilled-mirror sensors requiring stable, non-pressurized sample delivery at controlled flow rates (typically 1–2 L/min).
Is the 0.6 µm filter replaceable in the field?

Yes—filter cartridges are housed in a quick-release housing with standard 10–32 UNF threads; replacement intervals are determined by particulate load and are typically 6–12 months under clean-air conditions.
Does the system include temperature compensation for dew point calculations?

No—the SS-series provides physical sample conditioning only; temperature compensation is handled by the connected transmitter or host system based on its internal Pt100 or thermistor input.
Are mounting brackets and panel-cut templates supplied?

Yes—each unit ships with universal DIN-rail mounting hardware, surface-mount flange kit, and a dimensionally accurate cutout template for flush panel installation.