Available Available for application review and quotation
Moisture & Dew Point Measurement Series
FAS-SW

FAS-SW Trace Moisture & Dew Point Transmitter

Compact aluminum-oxide transmitter for continuous trace-moisture and water-dew-point measurement in demanding industrial gas service.

Brand: Vympel Manufactured by: LLC Scientific Production Association "Vympel", Russia Supply & support: Blue Dragon Technology
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Product Overview

Purpose-built measurement, clearly presented.

The FAS-SW is a compact field transmitter for continuous measurement of water dew point in industrial gases. Its aluminum-oxide sorption sensor supports trace-moisture monitoring across selectable calibrated ranges, while the stainless measurement chamber and high-pressure design suit demanding gas-process and pipeline sampling arrangements.

Blue Dragon Technology supplies the FAS-SW as an application-engineered measurement point. Final selection covers the calibrated range, sample pressure and temperature, gas compatibility, pressure reduction, filtration, flow control, hazardous-area requirements, signal integration, and the required verification strategy.

Distinctive Capabilities

  • Compact transmitter architecture for continuous trace-moisture monitoring at the measurement point
  • High-pressure capability for demanding gas-process and pipeline sampling arrangements
  • Aluminum-oxide sensing platform for reviewed inert, aggressive, and hydrogen-containing gases
  • Simple analogue integration with DCS, PLC, recorder, or local display systems
  • Rugged field housing for hazardous-area and outdoor instrument installations
Performance & Technical Data

The measurement method and the values that matter.

How it measures

Measurement Principle

Water vapor is reversibly adsorbed by a porous aluminum-oxide sensing layer, changing its electrical characteristics. The transmitter converts the compensated sensor response to water dew point and provides a 4-20 mA signal scaled to the ordered calibrated range.

Measurement ParametersWater dew point temperature
Measurement PrincipleAluminum-oxide sorption-type moisture sensor
Overall Water Dew Point Range-100 to +20 °C
Metrological Range I-70 to +20 °C
Metrological Range II-100 to +20 °C
Dew Point Accuracy±2.0 °C from -70 to +20 °C; ±3.0 °C from -100 to -70 °C

Complete Technical Data

4-20 mA Conversion Error
≤0.3%
Maximum Operating Pressure
300 bar
Sample Gas Flow
0.5-5 L/min
Sample Gas Temperature
-20 to +60 °C
Analog Output
4-20 mA
Power Supply
20-27 VDC
Power Consumption
≤3 W
Explosion Protection
1Ex ib IIC T6 Gb
Enclosure Protection
IP67
Ambient Temperature
-40 to +50 °C
Dimensions / Weight
≤95 × 24 × 24 mm / ≤1.0 kg, including measurement chamber
Industrial Use

Applications and industries.

Typical Applications

Trace Moisture Measurement in GasesWater Dew Point MeasurementGas Dehydration MonitoringHydrogen Moisture MonitoringSpecialty Gas Quality ControlNatural Gas Quality Monitoring

Industries Served

Biogas & Renewable GasCarbon Capture, Utilization & StorageChemical ProcessingFertilizers & ChemicalsHydrogen & SyngasIndustrial GasesIndustrial ManufacturingMetals, Mining & MaterialsNatural Gas & LNGOil & GasPetrochemicalsPipelines & MidstreamPower GenerationSemiconductor & Electronics
Engineering & Integration

Built for specification, installation, and long-term operation.

The FAS-SW is applied as a compact field transmitter. Reliable performance depends on a representative single-phase gas sample and an engineered pressure, filtration, flow, electrical, and hazardous-area interface.

Measurement RoleContinuous field transmitter
Sample InterfaceFlow-through measurement chamber
Primary Output4-20 mA
Project FocusPressure reduction, flow control, and sample integrity

System Configuration

  • StandardFAS-SW transmitter with measurement chamber and 4-20 mA output in the ordered calibrated dew-point range
  • OptionalPressure regulator, particulate or aerosol filtration, bypass flow control, isolation valves, flow indication, intrinsic-safety barrier, and local display
  • Project EngineeredInstrument panel, enclosure, heated or cooled sample line, stream selection, and sample return or safe vent arrangement

Sample Handling

  • StandardSupply a clean, single-phase gas sample within the specified pressure, temperature, and flow limits
  • Application DependentReduce pressure without creating condensation or allowing ambient moisture ingress
  • Application DependentSelect filtration that protects the sensor without changing the representative moisture content of the sample

Installation & Utilities

  • StandardProvide 20-27 VDC power and the approved intrinsically safe loop arrangement for the installation area
  • Application DependentConfirm mounting orientation, environmental exposure, grounding, cable entry, tubing material, and vent destination

Integration & Communications

  • StandardScale the 4-20 mA signal to the ordered calibrated dew-point range and terminate it at the DCS, PLC, recorder, or local indicator
  • Project EngineeredAlarm thresholds, historian tags, local indication, barriers, and signal-isolation requirements are defined in the project I/O schedule

Calibration & Quality Control

  • StandardFactory calibration and configuration records should identify the supplied measurement range and output scaling
  • Application DependentEstablish a periodic verification interval using a suitable reference hygrometer, moisture standard, or approved recalibration service

Maintenance & Service

  • StandardInspect the sample path for leakage, contamination, blocked filters, and stable flow
  • Application DependentVerification or recalibration frequency depends on gas cleanliness, exposure history, and the site quality plan

Safety & Application Considerations

  • StandardConfirm gas compatibility, pressure rating, hazardous-area certification, electrical loop design, and safe sample disposal before installation
  • Application DependentPrevent liquid water, hydrocarbon carryover, aerosols, and pressure transients from reaching the measurement chamber
Application Review

Application Engineering Notes

Pressure basis

Water dew point depends on pressure. The required result should be defined at measurement pressure, line pressure, or an agreed reference pressure.

Sample-system response

Heat tracing, pressure reduction, tubing length, leakage, dead volume, and ambient exposure can dominate the response of a trace-moisture installation and should be reviewed with the transmitter selection.

Project Delivery

Project Integration & Support Scope

Blue Dragon reviews the measurement objective, interfaces, documentation, commissioning, and lifecycle requirements as part of project configuration. The scope below identifies the principal items to confirm before order placement.

Measurement Objective
Continuous indication of trace moisture as water dew point in a conditioned industrial gas sample.
Signal Outputs
One 4-20 mA output scaled to the ordered calibrated water-dew-point range.
Data Integration
Connect the transmitter to a compatible DCS, PLC, recorder, or local indicator using the site-approved intrinsically safe loop design. Confirm range scaling, engineering units, alarm logic, cable requirements, and signal ownership in the I/O schedule.
Alarms & Diagnostics
Process alarms, bad-signal handling, and diagnostic logic are implemented in the receiving control system. The project should define low and high dew-point thresholds, signal-failure treatment, and any local indication required.
Documentation
The project package may include the manufacturer operating manual, approved datasheet, calibration or verification record, hazardous-area certification, wiring information, and sample-interface documentation as supplied or ordered.
Commissioning Support
Commissioning can include leak testing, pressure and flow verification, loop scaling, stabilization checks, comparison with a suitable reference, and confirmation of the sample return or vent arrangement.
Lifecycle Support
Lifecycle support covers application review, periodic verification, recalibration coordination, sample-system troubleshooting, spare filtration items, technical support, and replacement planning through Blue Dragon Technology.
Technical Resources

Product Documents

Product Sheet first, followed by the Brochure, Manual, and any additional technical documents.

Application Engineering

Discuss your measurement application.

Share the sample, measurement range, operating conditions, project location, and timeline. Blue Dragon Technology will review the application and recommend the appropriate configuration.

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