Available Available for application review and quotation
Moisture & Dew Point Measurement Series
HygroTrace

HygroTrace Ultra-Trace Moisture Analyzer

Coulometric ultra-trace moisture analyzer for quantitative gas-moisture measurement from 0.1 ppmV with calculated water dew point.

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.

HygroTrace is an automatic coulometric analyzer for quantitative measurement of trace moisture in natural and process gases. It reports moisture volume fraction and mass concentration and can calculate water dew point using the measured moisture value and the applicable pressure basis.

The analyzer is designed for applications where low-level moisture must be measured directly rather than inferred only from a conventional dew-point sensor. Blue Dragon Technology reviews the gas composition and chemical compatibility, required range, source and measurement pressure, sample cleanliness, pressure conditioning, bypass flow, hazardous-area requirements, outputs, and verification method before configuration.

Distinctive Capabilities

  • Quantitative coulometric measurement for ultra-trace gas-moisture applications
  • Direct reporting in ppmV and mg/m³ with pressure-dependent dew-point calculation
  • Low measurement-cell sample demand for high-value or limited-flow gases
  • High-pressure source sampling through an approved pressure-conditioning arrangement
  • Hazardous-area field design with analogue and Modbus communications
Performance & Technical Data

The measurement method and the values that matter.

How it measures

Measurement Principle

The sample passes through a coulometric measuring cell containing a moisture-reactive reagent. Water from the gas is quantitatively absorbed and electrolyzed, and the electrical charge required for electrolysis is proportional to the moisture entering the cell. Water dew point is then calculated from moisture concentration and pressure.

Measurement ParametersMoisture volume fraction, moisture mass concentration, and calculated water dew point
Measurement PrincipleAutomatic coulometric hygrometer
Gas CompatibilityNatural and process gases compatible with the coulometric sensing chemistry
Moisture Range I0.1-2,000 ppmV
Moisture Range II1-2,000 ppmV
Moisture Range III5-2,000 ppmV

Complete Technical Data

Moisture Mass Concentration
0.07-1,500 mg/m³
Calculated Water Dew Point
-90 to +20 °C; pressure dependent
Moisture Accuracy
±0.1 ppmV at 0.1-1 ppmV; ±7.5% at 1-2,000 ppmV
Water Dew Point Accuracy
±1 °C at sample pressure ≤10 MPa
Analyzer Operating Pressure
≤0.3 MPa
Maximum Source Pressure with Conditioning
≤16 MPa with SDG 131G or Model-018 pressure conditioning
Sample Gas Temperature
-40 to +60 °C
Measurement Chamber Flow
0.05-0.1 L/min
Bypass Flow
0.5-5 L/min
Sample Path / Connection
Stainless steel, glass, and fluoropolymer; fitting for 3 mm OD tubing
Outputs / Communications
Passive 4-20 mA, maximum 400 Ω; RS-485 Modbus RTU
Explosion Protection / IP
1 Ex d IIC T5 Gb / IP66-IP67
Power / Physical
20-27 VDC, ≤15 W; 230 × 245 × 235 mm; ≤14 kg
Industrial Use

Applications and industries.

Typical Applications

Trace Moisture Measurement in GasesGas Moisture Concentration MeasurementSpecialty Gas Quality ControlProcess Gas Moisture MonitoringLaboratory Gas Moisture AnalysisHydrogen Moisture MonitoringNatural Gas Quality MonitoringUltra-Trace Moisture Measurement in GasesWater Dew Point Measurement

Industries Served

Chemical ProcessingFertilizers & ChemicalsHydrogen & SyngasIndustrial GasesIndustrial ManufacturingNatural Gas & LNGPetrochemicalsResearch & Industrial LaboratoriesSemiconductor & Electronics
Engineering & Integration

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

HygroTrace is an ultra-trace analytical system whose performance depends on chemical compatibility, leak-tight pressure conditioning, very clean tubing, controlled flow, and prevention of ambient moisture or liquid contamination.

System TypeOnline coulometric trace-moisture analyzer
Measurement OutputppmV, mg/m³, and calculated water dew point
Sample DemandLow-flow measuring cell with bypass
Project FocusChemical compatibility and ultra-clean sample handling

System Configuration

  • StandardHygroTrace analyzer in the ordered moisture range with passive 4-20 mA and RS-485 Modbus RTU interfaces
  • OptionalSDG 131G or Model-018 pressure-conditioning equipment for higher-pressure source gas
  • Project EngineeredIsolation, fine filtration, pressure regulation, bypass flow control, purge arrangement, calibration connection, enclosure, and safe vent or sample return

Sample Handling

  • StandardSupply a clean gas that is chemically compatible with the coulometric sensing reagent and within the analyzer pressure, temperature, and flow limits
  • Application DependentUse moisture-clean tubing, fittings, valves, regulators, and filters with minimal dead volume and verified leak tightness
  • Application DependentPrevent liquid water, hydrocarbon aerosols, particulate contamination, reactive components, and ambient moisture ingress

Installation & Utilities

  • StandardProvide 20-27 VDC power, approved cable entries, grounding, and a controlled sample vent or return path
  • Project EngineeredPressure-conditioning panel, bypass, enclosure or shelter, purging, heating, cooling, drainage, and maintenance isolation as required

Integration & Communications

  • StandardPassive 4-20 mA and RS-485 Modbus RTU support connection to the plant control or data system
  • Project EngineeredDefine measurement units, output scaling, pressure basis for calculated dew point, register mapping, alarm logic, historian tags, and data-quality handling

Calibration & Quality Control

  • StandardFactory configuration and calibration records should identify the ordered range, reporting units, and pressure basis
  • Application DependentVerify performance with an approved trace-moisture reference gas, generator, or reference hygrometer using procedures suitable for the selected range

Maintenance & Service

  • StandardInspect the flow path, regulator, filters, fittings, bypass, and measurement-cell condition according to the manufacturer manual
  • Application DependentService intervals depend on gas cleanliness, chemical exposure, flow stability, and the site quality-control plan

Safety & Application Considerations

  • StandardConfirm gas and reagent compatibility, source pressure, pressure-reduction design, hazardous-area approval, safe venting, and electrical installation
  • Application DependentDo not expose the measuring cell to incompatible reactive gas, liquids, aerosols, or uncontrolled pressure transients
Application Review

Application Engineering Notes

Ultra-trace sample integrity

At ultra-trace levels, sample-system design is part of the measurement. Elastomer selection, regulator design, tubing finish, purge procedure, dead legs, leakage, adsorption and desorption, ambient humidity, and stabilization time can materially affect the result.

Gas compatibility

Application review requires the complete gas composition and identification of any component that may react with the phosphorus-oxide-based coulometric chemistry.

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
Quantitative online measurement of ultra-trace gas moisture in ppmV or mg/m³, with pressure-dependent calculation of water dew point where required.
Signal Outputs
Passive 4-20 mA and RS-485 Modbus RTU are available. Final output range, units, register use, calculated dew-point pressure basis, and alarm implementation are project specific.
Data Integration
Connect the analyzer to the DCS, PLC, SCADA, historian, or laboratory data system using the approved analogue or Modbus interface. Define the reported quantity, engineering units, pressure basis, data quality, and alarm ownership.
Alarms & Diagnostics
The project should define high-moisture alarms, analyzer fault handling, flow or pressure supervision, communication-failure behavior, and any local or remote diagnostic indication required.
Documentation
The project package may include the manufacturer operating manual, approved datasheet, calibration information, hazardous-area certification, connection and Modbus information, sample-system drawings, and commissioning records as ordered.
Commissioning Support
Commissioning can include cleanliness and leak checks, purge and stabilization, regulator and bypass setup, measurement-cell flow verification, output scaling, Modbus checks, and comparison with an approved trace-moisture reference.
Lifecycle Support
Lifecycle support covers sample-path cleanliness, filtration, regulator and bypass service, verification, measuring-cell troubleshooting, spare parts, recalibration coordination, and technical assistance through Blue Dragon Technology.
Online Analyzer Configuration

Sample System & Online Analyzer Readiness

Reliable online measurement depends on the process interface as well as the analyzer. Confirm the following application data before final configuration and quotation.

Sample Type & Phase
Clean, single-phase natural or process gas that is compatible with the coulometric sensing chemistry. Provide the full composition and identify reactive components, liquid carryover, aerosols, particulates, and expected contamination.
Measurement Range
Select the required 0.1, 1, or 5 ppmV lower range and state the normal and maximum moisture concentration, required units, calculated dew-point pressure basis, detection objective, and alarm points.
Sample Conditions
Provide source pressure, regulated analyzer pressure, temperature, available flow, ambient conditions, gas composition, contaminant loading, and the safe sample-disposal destination.
Sample Handling
Define moisture-clean tubing and fittings, pressure reduction to the analyzer limit, fine filtration, bypass flow, purge and isolation sequence, calibration connection, leak-test method, and measures preventing ambient moisture ingress.
Installation Area
Confirm indoor or outdoor location, hazardous-area classification, ambient range, shelter or enclosure requirements, maintenance access, and separation between the analyzer, pressure-conditioning equipment, and safe-area interfaces.
Utilities
Provide 20-27 VDC power, approved grounding and cable entries, regulated sample flow, purge or calibration gas where required, and a safe vent or return arrangement.
Response Requirement
State the required response and stabilization time, sample-line length, expected process step change, bypass flow, purge time, and acceptable delay after maintenance or exposure to ambient air.
Integration Requirement
Define 4-20 mA scaling, Modbus RTU mapping, reported units, calculated dew-point pressure basis, alarm logic, historian tags, local indication, and data-quality flags.
Commissioning Requirement
Confirm cleaning and leak-test acceptance, purge procedure, pressure and flow setup, stabilization criteria, reference-gas or hygrometer comparison, output checks, Modbus verification, training, and records.
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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