Machinery Masters is a marketplace for new and used gas analysers and detectors, the instruments that measure gas composition and detect the presence of specific gases across process, laboratory, and safety applications. A gas analyser quantifies how much of a gas, such as oxygen or carbon dioxide, is present in a sample or process stream, while a gas detector warns when a target gas, such as a combustible or toxic gas, exceeds a set level.

Together they support process control, product packaging, workplace safety, and emissions monitoring. Buyers include process and QC engineers, EHS and facilities teams, and procurement managers. Browse verified sellers to compare gas type, measurement principle, calibration, condition, and price before you buy.

Shop Gas Analysers & Detectors by Type

Gas analysers and detectors are available across measurement and safety functions, from precise composition analysis to area and personal gas detection. Selecting the correct type keeps the target gas, sensing technology, and format matched to your application. The main differences between configurations relate to the gas measured, the sensing principle, whether the instrument analyses concentration or detects a threshold, and whether it is a fixed, portable, or laboratory unit.

Oxygen Analysers

Oxygen analysers measure oxygen concentration in gases and process streams using electrochemical, paramagnetic, or zirconia sensing, from trace-level purity monitoring to percentage measurement. They are essential for inerting and blanketing control, gas purity verification, and any process where oxygen level must be tightly controlled.

Carbon Dioxide and Infrared Gas Analysers

Carbon dioxide and infrared analysers use non-dispersive infrared sensing to quantify CO2, carbon monoxide, and other infrared-active gases. Their selectivity and stability suit process monitoring, incubator and cell culture control, and any application where a specific gas concentration must be measured accurately.

Headspace Gas Analysers

Headspace gas analysers measure the oxygen and carbon dioxide in the space above a product inside sealed packaging or vials. They verify modified atmosphere packaging and pharmaceutical container integrity, confirming that each pack or vial holds the correct protective atmosphere for product stability.

Portable and Multi-Gas Detectors

Portable and multi-gas detectors provide personal and spot-check monitoring for several gases at once, protecting workers in confined spaces and around potential leaks. Compact and rugged, they alarm on hazardous concentrations of oxygen and combustible and toxic gases wherever people work near a gas risk.

Fixed Gas Detection Systems

Fixed gas detection systems continuously monitor areas and process points for hazardous gas build-up, triggering alarms and safety actions when a threshold is reached. Mounted where a leak or accumulation could occur, they provide the permanent, around-the-clock protection that plants and laboratories require.

Combustible, Toxic, and Flue Gas Analysers

Combustible and toxic gas detectors sense flammable gases at the lower explosive limit and toxic species such as hydrogen sulphide, while flue gas analysers measure combustion gases for efficiency and emissions. These instruments protect people and equipment and verify that processes and exhausts meet safety and environmental limits.

Gas Analysers & Detectors Brands on Machinery Masters

Machinery Masters lists gas analysers and detectors from established gas measurement and detection manufacturers so you can source a specific make and model or compare comparable instruments across sellers.

Servomex
Emerson
Siemens
ABB
Teledyne
Dräger
Honeywell
MSA Safety
Systech Illinois
Horiba

Gas Analysers & Detectors: Applications and Uses

Gas analysers and detectors are deployed across pharmaceutical, process, safety, and environmental settings wherever gas composition must be measured or a hazardous gas detected. Requirements depend on the target gas, the accuracy or alarm level needed, and the safety or accreditation framework the site works within.

Pharmaceutical Packaging and Headspace Analysis

Pharmaceutical and packaging operations use headspace analysers to confirm the protective atmosphere inside vials, blisters, and modified atmosphere packs. Verifying oxygen and carbon dioxide levels protects product stability and confirms container integrity as part of quality control.

Process and Inerting Gas Monitoring

Process operations use oxygen and infrared analysers to monitor inerting, blanketing, and gas purity, keeping oxygen and other gases within defined limits. Reliable in-line measurement protects product quality and process safety where atmosphere control is critical.

Workplace Safety and Gas Detection

Facilities use portable, multi-gas, and fixed detectors to protect workers from oxygen deficiency, combustible gas, and toxic exposure in confined spaces and around process equipment. Continuous detection and clear alarms are central to a safe working environment.

Emissions and Environmental Monitoring

Sites use flue and emissions gas analysers to measure combustion gases and verify compliance with environmental limits. Accurate emissions data supports both process efficiency and regulatory reporting.

Frequently Asked Questions

What is the difference between a gas analyser and a gas detector?

A gas analyser measures the concentration of a specific gas, reporting how much is present, which is used for process control, purity verification, and packaging. A gas detector monitors for a target gas and alarms when it exceeds a set threshold, which is used mainly for safety. In short, an analyser quantifies a gas precisely, while a detector warns when a hazardous gas reaches a dangerous level.

How does an oxygen analyser work?

Oxygen analysers use several sensing principles. Electrochemical sensors generate a current proportional to oxygen concentration; paramagnetic sensors respond to oxygen's magnetic properties for high accuracy; and zirconia sensors measure oxygen at high temperatures for combustion and trace applications. The right technology depends on the concentration range and the accuracy your process requires.

What is headspace gas analysis used for?

Headspace gas analysis measures the oxygen and carbon dioxide in the gas space above a product inside sealed packaging or a vial. It verifies that modified atmosphere packaging holds the correct protective gas mix and confirms container and seal integrity. In pharmaceutical and food production, this protects product stability and shelf life by confirming each pack is correctly sealed and filled.

What should I consider when buying a gas analyser or detector?

Start with the target gas and concentration range, then choose the sensing technology and whether you need continuous analysis or threshold detection. Consider whether the instrument is fixed, portable, or laboratory-based, and check calibration requirements, sensor life, and any hazardous-area certification. For a used unit, confirm sensor condition, calibration history, and service support. Confirm the specification with the seller before you buy.

What is the difference between new and used gas analysers and detectors?

New instruments arrive with a manufacturer warranty, current sensors, and full documentation. Used and refurbished analysers and detectors offer significant savings from reputable sellers with documented service history and clear provenance. Because sensors age and drift, verify the sensor condition and calibration, and plan to recalibrate against a traceable standard before the instrument enters service.

Where can I buy gas analysers and detectors on Machinery Masters?

Browse Machinery Masters for new and used oxygen and infrared gas analysers, headspace analysers, portable and multi-gas detectors, and fixed gas detection systems from verified sellers worldwide. Use the search and filter tools to narrow by gas, brand, and specification, then contact sellers directly to request calibration records, service history, and technical specifications before you buy.

Gas Analyzers & Detectors

Gas Analyzers & Detectors