EMCEE Model 1140 Water Separation Index (WSI) Filter Test Apparatus

Overview

The EMCEE Model 1140 Water Separation Index (WSI) Filter Test Apparatus is a precision-engineered benchtop instrument designed specifically for evaluating the water separation efficiency of coalescing filter elements used in aviation turbine fuel handling systems. It operates on the principle of controlled fuel flow through a standardized test filter under defined pressure and temperature conditions, followed by quantitative measurement of residual water content in the filtrate using calibrated optical detection. The apparatus implements the gravimetric and photometric methodology outlined in ASTM D3948 – Standard Test Method for Determining Water Separation Characteristics of Aviation Turbine Fuels by Portable Separometer and its Chinese national equivalent SH/T 0616–1995. This method quantifies the Water Separation Index — a dimensionless value derived from the ratio of water concentration in the filtered effluent to that in the challenge fuel — providing a reproducible metric for assessing filter performance degradation, media compatibility, and fuel/water emulsion stability.

Key Features

• Factory-calibrated flow control system ensuring consistent volumetric delivery at 100 mL/min ± 2% across operating range (20–30 °C)
• Integrated thermostatically regulated fuel reservoir with digital temperature display (±0.5 °C accuracy) to maintain ASTM-specified 25 °C test condition
• Dedicated optical sensor module compliant with ASTM D3948 Annex A1 for low-concentration water-in-fuel detection (detection limit: ≤5 ppm w/w)
• Modular filter holder accommodating standard 47-mm diameter disc filters or OEM-specific cartridge adapters
• Stainless steel fluid path construction with electropolished internal surfaces to minimize surface adsorption and ensure chemical resistance to hydrocarbon fuels
• Compliance-ready design supporting audit trails via optional RS-232/USB data logging interface (firmware v2.1+)

Sample Compatibility & Compliance

The Model 1140 is validated for use with Jet A, Jet A-1, JP-5, and JP-8 aviation turbine fuels meeting ASTM D1655 or DEF STAN 91-91 specifications. It accommodates fuel samples containing dissolved water up to saturation limit (~30 ppm at 25 °C) and dispersed water phases generated via standardized emulsification per ASTM D3948 Section 7. All wetted components comply with NIST-traceable dimensional tolerances and are certified free of fluorinated polymers that may interfere with coalescence kinetics. The apparatus meets mechanical and procedural requirements for GLP-compliant laboratories and supports documentation alignment with FDA 21 CFR Part 11 when paired with validated data acquisition software. Routine verification includes daily calibration checks using NIST-certified water-in-fuel reference standards (SRM 2782 series).

Software & Data Management

While the base Model 1140 operates as a stand-alone analog instrument, optional firmware upgrade (EMCEE WSI-Link v3.0) enables real-time data streaming to Windows-based analysis software. This software provides automated WSI calculation per Equation 1 of ASTM D3948, generates time-stamped test reports with operator ID, environmental logs (temperature/pressure), and digital signatures. Audit trail functionality records all parameter changes, calibration events, and report exports in an immutable format compliant with ISO/IEC 17025 Clause 7.7 and EU Annex 11 requirements. Raw sensor output (mV vs. time) and calculated WSI values are exportable in CSV and PDF formats for integration into LIMS environments.

Applications

• Quality assurance testing of new coalescer filter elements prior to field deployment in fuel hydrant systems
• Accelerated life-cycle evaluation of filter media under controlled contamination challenges (e.g., particulate + water)
• Verification of fuel reprocessing efficacy following pipeline contamination incidents
• Supporting API RP 4732-compliant filtration system validation protocols
• Research on surfactant-induced emulsion stabilization mechanisms in jet fuels
• Third-party certification testing for filter manufacturers seeking EN 14213 or MIL-DTL-83133 qualification

FAQ

What fuel standards does the Model 1140 support?

It is validated for ASTM D1655 Grades Jet A and Jet A-1, DEF STAN 91-91, and GB 6537–2018 aviation turbine fuels.
Is operator training required to achieve ASTM D3948 compliance?

Yes — users must complete EMCEE-certified procedure training covering emulsification protocol, sensor zeroing, and rejection criteria per Section 10 of ASTM D3948.
Can the apparatus be used with alternative filter geometries?

Only with EMCEE-approved adapters; non-standard configurations invalidate WSI traceability to ASTM D3948.
Does the Model 1140 include calibration certification?

Each unit ships with a NIST-traceable Certificate of Conformance covering flow rate, temperature control, and optical sensor linearity.
How frequently must the optical sensor be recalibrated?

Annual recalibration is recommended; verification against SRM 2782 must be performed before each test batch.