Starwood SDW-150 Portable Pressure Sampler

Overview

The Starwood SDW-150 Portable Pressure Sampler is an engineered fluid handling auxiliary device designed specifically for controlled, pressure-assisted sampling of viscous petroleum-based liquids in field and laboratory environments. It operates on a dual-mode pneumatic principle—capable of generating and maintaining both positive pressure (up to 600 kPa) and vacuum (down to –80 kPa)—to overcome flow resistance inherent in high-viscosity oils, lubricants, hydraulic fluids, and transformer insulating oils. Unlike passive syringe or gravity-fed samplers, the SDW-150 integrates a brushless DC pressure pump and real-time pressure feedback control, enabling precise, repeatable delivery of sample volumes into downstream analytical instruments—most commonly portable liquid particle counters (e.g., HIAC, PAMAS, or Light Obscuration-based units). Its mechanical architecture prioritizes operational robustness under variable ambient conditions (10–40 °C), making it suitable for use in refinery perimeters, offshore platform maintenance zones, and mobile oil condition monitoring labs.

Key Features

• Dual-mode pressure generation: seamless switching between positive pressure (0–600 kPa) and vacuum (0–80 kPa) via front-panel toggle or software command (in PC-connected configuration)
• Integrated high-stability piezoresistive pressure sensor with ±1.5% FS accuracy, enabling programmable setpoint control and real-time pressure monitoring
• Brushless DC drive pump ensures low noise, extended service life (>10,000 cycles), and consistent flow performance across viscosity ranges up to 300 cSt at 40 °C
• Compact monocoque housing (220 × 140 × 95 mm), ABS+PC composite construction, and <1.8 kg mass enable one-handed operation and integration into instrument carry cases
• Two configuration options: Mechanical Edition (manual pressure knob + analog gauge) and PC Edition (USB 2.0 interface, compatible with Windows-based control software supporting logging and parameter recall)
• Electrical safety compliance: CE-marked power adapter; isolation-rated input circuitry; thermal cutoff protection at >65 °C internal temperature

Sample Compatibility & Compliance

The SDW-150 is validated for compatibility with mineral oils, synthetic esters, polyalphaolefins (PAOs), and phosphate ester fire-resistant fluids—materials commonly encountered in turbine, gearbox, compressor, and hydraulic system oil analysis. Wetted components include stainless steel (316 SS) pressure chamber, fluorosilicone O-rings (FVMQ), and borosilicate glass sample vial adapters—ensuring chemical inertness and minimal leachables. The device supports ISO 4021:2017 (petroleum liquids — manual sampling) methodology when used with certified sample containers and laminar-flow transfer lines. While not a standalone analytical instrument, its pressure delivery function aligns with ASTM D6786 (Standard Practice for Sampling Lubricating Oils for Analysis) and supports GLP-compliant workflows when paired with audit-trail-enabled particle counters.

Software & Data Management

The PC Edition includes Starwood Sampling Control Suite v2.1—a lightweight Windows application (x64, .NET Framework 4.8+) that provides full parameter configuration, real-time pressure waveform visualization, and CSV export of timestamped pressure logs. Each session records operator ID, date/time, target pressure, actual pressure trace (10 Hz sampling), and duration. The software enforces user-level access controls (admin/operator modes) and generates tamper-evident PDF reports compliant with basic 21 CFR Part 11 requirements—including electronic signatures, audit trail activation, and secure local storage. No cloud connectivity or remote telemetry is implemented, preserving data sovereignty for industrial clients operating under strict IT security policies.

Applications

• Pre-conditioning viscous oil samples prior to analysis by portable liquid particle counters in accordance with ISO 4406 and NAS 1638 standards
• Pressure-assisted filtration of particulate-laden samples through 3–5 µm membrane filters without bubble formation or channeling
• Controlled aspiration of oil from sealed reservoirs or pressurized sumps where conventional dip-tube sampling is impractical
• Calibration verification of inline particle sensors using known-pressure delivery of reference suspensions (e.g., ISO Medium Test Dust, MTU Oil Test Dust)
• Field deployment during predictive maintenance audits of wind turbine gearboxes, marine diesel engines, and hydroelectric turbine systems

FAQ

What is the maximum viscosity this sampler can handle reliably?
The SDW-150 delivers stable flow for oils up to 300 cSt at 40 °C when used with 1/4″ OD stainless steel tubing and standard 10 mL sample vials. For viscosities exceeding 500 cSt, pre-heating the sample to 50–60 °C is recommended.
Can it be used with non-petroleum fluids such as glycol or brake fluid?
Yes—provided compatibility with fluorosilicone seals is confirmed. Avoid use with strong ketones, chlorinated solvents, or concentrated acids/bases due to elastomer degradation risk.
Is battery operation supported?
No. The SDW-150 requires AC mains power (110–220 V). An external 24 V DC portable power station (≥300 W continuous output) may be used with appropriate voltage conversion, though not officially validated by Starwood.
Does it meet ATEX or IECEx certification for hazardous areas?
No. The SDW-150 is rated for general-purpose industrial use only (IP54 enclosure). It is not intrinsically safe and must be operated outside Zone 1/2 classified locations.
How often does the pressure sensor require recalibration?
Annual calibration is recommended. Starwood provides NIST-traceable calibration certificates upon request; field verification using a Class 0.1 digital manometer is supported via the device’s zero-balance and span-adjust functions.