Moisture & Water Vapor Sensor: GPro 500

Moisture Gas Analyzer for Chlor-Alkali

Tunable Diode Laser for H₂O Measurement

The GPro 500 moisture and water vapor (H2O) analyzer is a unique tunable diode laser spectrometer designed for direct measurement of H2O in gas streams. It uses a folded-path laser beam design for simple installation and accurate moisture detection.

Top Performance for Moisture Measurement
A moisture sensor for challenging applications, the GPro 500 provides a reliable measurement in applications such as chlorine gas and EDC storage.

Low Maintenance and Operating Costs
This H2O gas analyzer is designed to operate in situ without a maintenance-prone conditioning system, reducing the total cost of ownership.

Easy Installation
The GPro 500 is an alignment-free TDL gas analyzer, meaning that the typical challenges of TDL installation and alignment are significantly reduced.

Moisture & Water Vapor Sensor: GPro 500
Specifications - Moisture Gas Analyzer for Chlor-Alkali
Gas Measured Moisture / water vapor
Lower Detection Limit 5 ppm-v, 1ppm-v
Measurement range 0-200,000 ppm (0-2%), 0-100,000 ppm (0-1%)
Accuracy 2% of reading or 10 ppm, whichever is greater
Linearity Better than 1%
Resolution 5 ppm-v, 1 ppm-v
Drift Negligible (<2% of measurement range between maintenance intervals)
Sampling rate 1 second
Response time (T90) H₂O in N₂ 1% to 0% in <4 seconds
Repeatability ±0.25% of reading or 50 ppm-v H20 (whichever is greater)
Process pressure range 0.8 bar - 3 bar (abs)/11.6 psi - 29 psi (abs), 0.8 bar - 5 bar (abs)/11.6 psi – 72.5 psi (abs)
Process temperature range 0-250 °C (23-482 °F); optional (for probe installation) 0-600 °C (0-1112 °F) with additional thermal barrier
Effective path length 50 mm - 10 m, depending on adaption
Process Adaption or Sensor Sensor

Features and Benefits

Protect Your Assets from Corrosion
The GPro 500 moisture and water vapor analyzer is ideal for corrosion prevention at chlorine compressors. By detecting water vapor at ppm levels, you can control corrosive moisture in your gas stream. These TDL analyzers offer fast water vapor measurement.
Protect Your Assets from Corrosion
Immediate, In Situ Measurement
This H2O analyzer is installed in situ, so you get a quick response without the need to extract and condition a sample. This offers a reliable and cost-effective alternative to technologies that require extraction and conditioning of the gas stream.
Immediate, In Situ Measurement
Designed for Challenging Installations
The GPro 500 is configurable, enabling the moisture and water vapor gas analyzer's measurement system to be paired with a variety of process adaptions to meet a wide range of installation requirements and pipe sizes.
Designed for Challenging Installations
Predictive Diagnostics Ensure Long Life
This moisture analyzer uses Intelligent Sensor Management (ISM) technology to offer predictive diagnostics on analyzer condition, including informing you when cleaning of the optical path will be required.
Predictive Diagnostics Ensure Long Life



Gas Analytics Brochure
Safety, quality, productivity: that’s what’s most important to you. And that’s why our approach to designing analyzers and sensors is based around a s...


Gas Analysis
In this free booklet we discuss the theory of absorption spectroscopy and how TDL analyzers are being employed in an increasing number of process and...
Complimentary eBooklet: Gas Applications for GPro 500 Analyzers
This eBooklet is intended as a convenient reference to a selection of the most common GPro 500 applications.

White papers

White Paper: TDLs for All Your Processes – Folded-Path Gas Analyzers
Our portfolio of folded-path tunable diode laser (TDL) gas analyzers now has a unique range of process adaptions. Combined, they have opened the door...
No More Purge Gas-New TDLs for Combustion Processes
This white paper explains how the new generation of TDLs not only offers exceptional fuel costs savings, but eliminates the need for process side purg...
Measurement of Oxygen Concentration
Gaseous oxygen measurement with amperometric sensors is the most direct and easiest solution for protection against oxidation and explosion.
Inerting Made Efficient, Replacing Extractive Oxygen Analyzers
Manufacturing operations must keep output and quality their top priority. Switching from maintenance-intensive on-line extractive systems to a more re...
Measurement of Oxygen Concentration
Gaseous oxygen measurement with amperometric sensors is the most direct and easiest solution for protection against oxidation and explosion.
Polarographic Oxygen Measurement
For the measurement of oxygen in continuous process analysis, several technologies are available.
Minimizing Inerting System Maintenance
This white paper explains how TDL O₂ sensor can minimize inerting system maintenance & how to integrate them into a DCS system for fully automated oxy...
Gas Analysis Made Easy
Tunable Diode Laser (TDL) oxygen sensors from METTLER TOLEDO unite the best elements of two technologies to form a highly dependable monitoring system...


Data Sheet: H₂O Analyzer GPro 500
The GPro 500 TDL moisture sensor is designed for the measurement of H2O levels for corrosion prevention. In situ installation can avoid risks of toxic...

Technical Specifications


Safety Manual for TDLS GPro 500 - Tunable Diode Laser Spectrometer
This document contains information and safety instructions required to use the GPro 500 with direct analog output option in SIL environments.


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Moisture Gas Analyzer for Chlor-Alkali
USP Class VI
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