ALPHA SS-B/TEG/NGH Dew Point Sampling System
| Brand | ALPHA |
|---|---|
| Origin | United Kingdom |
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | SS-B/TEG/NGH |
| Pricing | Available Upon Request |
Overview
The ALPHA SS-B/TEG/NGH Dew Point Sampling System is an engineered solution for precision moisture monitoring in high-purity process gases and dry compressed air systems—commonly deployed in power generation, turbine inlet air treatment, SF₆ gas handling, natural gas dehydration, and nitrogen blanketing applications. It operates on the principle of controlled isobaric sampling: by regulating sample line pressure to atmospheric conditions (101.3 kPa abs), it eliminates condensation risk and thermodynamic distortion during transport to dew point transmitters (e.g., AMT or PDT series). This pressure-normalized sampling architecture ensures trace-level water vapor measurements—down to –80 °C Td or lower—are representative of actual process conditions, meeting the metrological rigor required for ISO 8573-1 Class 1–2 compressed air certification and IEC 60076-15 transformer gas moisture compliance.
Key Features
- Integrated pressure regulation system with stainless steel diaphragm regulator rated to 210 bar (3,045 psi) inlet pressure—enabling direct connection to high-pressure mains without external reduction stages
- Atmospheric-pressure sampling manifold: maintains sample at ambient pressure downstream of regulator, eliminating adiabatic cooling effects that compromise dew point accuracy
- Compact wall-mount design (260 × 160 × 30 mm) with pre-drilled 4 mm mounting holes spaced 10 mm from edges—optimized for panel integration in control rooms and switchgear enclosures
- Flow-controlled sampling path: calibrated rotameter supports 0–5 L/min flow range with visual indication; compatible with both vent-to-atmosphere and recirculation configurations
- Corrosion-resistant construction: 316 stainless steel fittings, hammer-finished epoxy-coated backplate, and NPT/BSP/ISO metric port options (1/8″, 1/4″, 6 mm tubing)
- Transmitter-agnostic interface: accepts both active 4–20 mA dew point transmitters and passive chilled-mirror or aluminum oxide sensors with appropriate signal conditioning
Sample Compatibility & Compliance
The SS-B/TEG/NGH system is validated for use with inert, non-corrosive, and low-particulate process streams including nitrogen, argon, SF₆, dry air, and natural gas (up to NGH-grade hydrocarbon dew point specifications). It complies with CE marking requirements under the EU Pressure Equipment Directive (PED 2014/68/EU) for Category I components and meets electromagnetic compatibility (EMC) standards per EN 61326-1. When paired with UKAS-accredited AMT/PDT transmitters, the full sampling chain satisfies GLP audit trails and supports FDA 21 CFR Part 11-compliant data integrity protocols when integrated into SCADA or DCS historian systems.
Software & Data Management
While the SS-B/TEG/NGH is a hardware-only sampling interface, its analog output compatibility enables seamless integration with industry-standard asset monitoring platforms—including Siemens Desigo CC, Honeywell Experion PKS, and Emerson DeltaV—via 4–20 mA loop-powered transmitters. Calibration certificates include NIST-traceable reference points at multiple dew point setpoints (–60 °C, –40 °C, 0 °C), and all documentation conforms to ISO/IEC 17025 reporting requirements. Optional digital I/O modules support Modbus RTU or HART 7 communication for remote diagnostics and flow-regulator status monitoring.
Applications
- Power plant turbine inlet air drying verification prior to combustion
- SF₆ gas moisture monitoring in high-voltage circuit breakers and GIS systems per IEC 60480
- Natural gas dehydration validation at custody transfer points (TEG amine contactor outlet, NGH hydrate inhibition zones)
- Pharmaceutical cleanroom compressed air qualification per ISO 8573-1:2010 Class 1 (≤0.1 mg/m³ water)
- Electronics manufacturing nitrogen purge lines requiring <1 ppmv H₂O stability
FAQ
Can the SS-B be used with chilled-mirror dew point analyzers?
Yes—its pressure-regulated, atmospheric-output design eliminates thermal lag and condensation artifacts critical for chilled-mirror performance.
Is field calibration of the integrated flowmeter possible?
The rotameter is factory-calibrated for air at 20 °C and 101.3 kPa; recalibration requires certified gas flow standard equipment and is not user-serviceable.
What is the maximum allowable particulate concentration in the sample stream?
For optimal longevity, inlet gas should contain ≤1 µm particles at <1 mg/m³ concentration; inline sintered stainless steel filters (5 µm) are recommended upstream.
Does the system support hazardous area installation?
The SS-B itself carries no intrinsic ignition risk; however, explosion-proof transmitter housings and ATEX-certified accessories must be selected separately per zone classification.
How does the SS-B differ from the TEG and NGH variants?
SS-B denotes base configuration; TEG includes integrated triethylene glycol-compatible wet-gas sampling ports; NGH adds hydrocarbon dew point stabilization features for natural gas applications.
