Hydrogen Chloride Gas Analyzer: GPro 500

Hydrogen Chloride Gas Analyzer: GPro 500

Tunable Diode Laser for HCl Measurement

The GPro 500 hydrogen chloride (HCl) gas analyzer is a unique tunable diode laser spectrometer designed for high performance in challenging applications. It uses a folded-path laser beam design for simple installation and accurate HCl determination.

Top Performance in HCl Measurement
An HCl analyzer for challenging applications, the GPro 500 provides reliable measurement in scrubber towers, flue gas, and VCM applications.

Low Maintenance and Operating Costs
This HCl 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.

Hydrogen Chloride (HCl) GPro 500

HCl Gas Sensors Frequently Asked Questions

Why use a TDL sensor for measuring hydrogen chloride?

TDLs have many advantages over other HCl measurement technologies. Fir...

Why use a TDL sensor for measuring hydrogen chloride?

TDLs have many advantages over other HCl measurement technologies. Firstly, they are installed in situ in the process pipe or vessel so are exposed directly to the gas and therefore measure immediately. Some other analyzers measure a sample of gas that has been extracted and conditioned, which takes time and increases risk. Secondly, TDLs are immune to the presence of other gases in the process and will only measure HCl. Thirdly, they are extremely reliable and require practically zero maintenance.


How can a HCl TDL reduce costs?

Unlike other gas measurement technologies, TDLs have a very low maintenance requirement. Once installed, they will run reliably for many months without needing any maintenance.


Are TDL HCl analyzers easy to install?
Sometimes. Once the insertion point has been selected it’s a matter of fitting one or two flanges and a temperature and pressure sensor. Most TDLs are of a cross-stack design, meaning that they’re comprised of two parts (laser source and receiver) that sit opposite each other in the pipe or vessel. The two units have to be very carefully aligned which can be problematic. The GPro 500 has both parts installed in the same unit. The laser source is reflected by a three-sided mirror and is directed back to the receiver. Therefore, no alignment is required. Watch our video on easy installation.


In which applications can TDLs be used?

TDLs have a wide range of applications, including process control in direct chlorination and oxy-chlorination; safety monitoring in VCM waste gas recovery; and combustion optimization in package boilers, thermal oxidizers, fired heaters, FCC units, etc. For more information check our Application eBooklet


Specifikationer - Hydrogen Chloride Gas Analyzer: GPro 500
Uppmätt gas Hydrogen chloride
Undre detektionsgräns 0.6 ppm-v
Mätområde 0-1% under standard conditions
Noggrannhet 2% of reading or 0.6 ppm, whichever is greater
Linearity Better than 1%
Upplösning 0.6 ppm-v
Drift Negligible (<2% of measurement range between maintenance intervals)
Provtagningsfrekvens 1 second
Responstid vid (T90) HCL in N₂ 1% to 0% in <4 seconds
Repeterbarhet ±0.25% of reading or 3 ppm-v HCl (whichever is greater)
Processtryckområde 0.8 bar - 3 bar (abs)/11.6 psi - 43 psi (abs)
Processtemperaturområde 0-250 °C (23-482 °F); Optional (for probe installation) <br>0-600 °C (0-1112 °F) with additional thermal barrier
Effektiv banlängd 50 mm - 10 m, depending on adaption

Features and Benefits

Meets Critical Application Needs
This HCl gas analyzer is ideal for applications such as HCl monitoring in stacks and scrubbers. For meeting environmental and regulatory needs, these tunable diode laser gas analyzers offer a precise, reliable, and fast measurement.
Meets Critical Application Needs
Immediate, In Situ Measurement
The GPro 500 HCl gas 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 gases.
Immediate, In Situ Measurement
Designed for Challenging Installations
The GPro 500 is configurable, enabling the hydrogen chloride gas analyzer's measurement system to be paired with a variety of process adaptions to meet a wide range of installation requirements.
Designed for Challenging Installations
Predictive Diagnostics Reduce Downtime
This HCl gas analyzer uses Intelligent Sensor Management (ISM) technology to provide predictive diagnostics on analyzer condition, to inform you when cleaning of the analyzer's optical path will be required.
Predictive Diagnostics Reduce Downtime



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...
Kostnadsfri e-broschyr om TDL-mätning
Denna kostnadsfria e-broschyr ger en enkel överblick över ett urval av de vanligaste GPro 500-applikationerna.

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...
White paper om gasanalysatorer
Denna tekniska rapport förklarar hur den nya generationen TDL-sensorer inte bara erbjuder enastående kostnadsbesparingar för bränsle, utan även elimin...
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...

Teknisk specifikation


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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Hydrogen Chloride Gas Analyzer: GPro 500


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Hydrogen Chloride Gas Analyzer: GPro 500
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