AquaGas Pty Ltd – Enews – New Products – PID Analyzers

AquaGas Pty Ltd recently took over the technical and sales representation of PID Analyzers LLC (MA, USA) in Oceania. With more than 40,000 systems sold worldwide, PID Analyzers LLC offers performant and reliable solutions for a large panel of industrial and environmental applications. PID Analyzers LLC microprocessor based electronics is designed to control large range of gas proprietary sensors such as photoionization, flame ionization, thermal conductivity, flame photometry, infrared & amp; UV absorption, electrochemistry, capacitance…

Thus AquaGas complete its offer for Air Quality, Laboratory, Continuous Emissions Monitoring Systems and process control with a versatile and powerful technology perfectly suited to today’s industries, environmental agencies and laboratories requirements. PID Analyzers LLC Gas Chromatography based technology enables ultra low (ppt) to process level (%) online measurement of a broad range of chemicals in ambient air and industrial emissions especially for the key components Sulphur compounds and Mercury.


Zoom on the MC301

Sulphur Compounds Online Analysis

Ultra-Low level in Ambient air

The M301C® Gas Chromatograph analyser belongs to the fourth generation of GC developed by PID Analyzer LLC (USA) for online monitoring of wire range of gases including but not limited to Sulphur compounds (Mercaptans, COS, CS2, SO2, H2S, DMS, THT, EM, MM, DES…) in ambient (AQMS) and indoor air (OH&S).



AquaGas is supporting the global industrial community with high performance environmental and process monitoring systems (Continuous Emissions Monitoring Systems, Air Quality Monitoring Systems, Online process analysers, Water Quality Monitoring Systems) specifically designed and built to meet your application requirements.


Tank Headspace Monitoring Systems – THMS


in the Oil and Gas industry.

Water treatment plant in refineries and other oil and gas processes requires the use of tank for storage purposes and as part of the wastewater management plan. The composition of the air confined in the tank headspace provides a good indication of the level of contamination in the wastewater influents. Monitoring gas in tank headspaces also becomes mandatory when it comes to managing oils contaminated water. Explosion risks but also the corrosion and degradation factor are controlled with the blanketing whose automation can largely be optimised by the online measurement of gas concentrations in the headspace. Moreover there is a large number of compounds that will  adduce plant operators detailed information with regards to filtration and decantation processes.

Tank Blanketing Automation

Tank blanketing is the process of filling the headspace in storage vessels and reactors with an inert gas, usually to protect its contents from exploding, degrade but also to protect equipment from corrosion. As oxygen and moisture in the air can be undesired in numerous processes and applications, blanketing is done in a wide range of industries, varying from petrochemicals to food and beverage, pharmaceutical to pure water. Inerting is done for similar reasons but is not limited to storage tanks and reactors only. Any confined space can be sparged with an inert gas to create the desired atmosphere. This ranges from packing food under protective atmosphere to increase shelf life to lowering the oxygen concentration in rooms where welding takes place to reduce risk of fire.

Risks Management

Wrongly engineered or poorly maintained blanketing systems may lead to serious incidents, degraded plant operations and pollution events. A malfunctioning may cause the tank to implode or causes the leaking of air into the tank, which, as mentioned, can have consequences with regard to product quality and, depending on the stored product, can seriously increase risk of explosion.

One way to increase safety and reduce the use of blanketing gas (nitrogen, air…) simultaneously is to control inertisation as a function of gas concentration in the headspace. Depending on the product and the reason for blanketing and inerting, there are tolerances when it comes down to the maximum allowable oxygen, VOCs or other combustibles concentration. Certain monomers require zero percent oxygen to prevent polymerization. Others require a small amount of oxygen for the same reason. In the case of explosion protection, the oxygen concentration does not necessarily need to be zero. In fact for all solvents a so called limiting oxygen concentration exists. Below this concentration there is no risk of explosion. It is obvious that controlling the tank headspace purge based on the concentration will seriously cut nitrogen or other blanketing gas costs. Furthermore the measurement of gas concentrations in the tank headspace provides an important safety parameter.   Thresholds such as Limiting Oxygen Concentration (LOC), Maximum Oxygen Concentration (MOC), Lower Explosive Limit (LEL) indicate application and gas specific limits in terms of concentration.

For example, two threshold values are established for the oxygen concentration in the tank headspace, well below the Limiting Oxygen Concentration; the Lower Intervention Level and the Upper Intervention Level. These two threshold values are the set-points that control the purging sequences. The moment the oxygen concentration reaches the Lower Intervention Limit, the nitrogen flow is intermittent. Purging of the vessel is resumed when the upper intervention limit is exceeded. This means that the inerting system keeps the consumption of nitrogen minimal while safe operation is ensured.

Analyser solutions

Depending on individual process conditions and solvent; O2, H2O and LEL are usually the main parameters of interest. However when odour control is implemented NH3, H2S and VOCs can be added to the monitored parameters.

To meet the needs of the waste recycling facilities, AquaGas offers a unique fully automatic solution for realtime measurement of gas concentrations in Tank Headspaces. AquaGas THMS features the association of a MAMOS multigas analyser fitted with a combination of 9 gas proprietary measuring cells with a field proven, robust and dedicated Exproof sampling train. The system can be multiplexed for controlling up to 4 tank headspaces. Both the gas sampling probe located at the top of the tank and the sample line are temperature controlled above the gas dew point. Depending on the application, the gas can also be fitted with the optional backflush, temperature sensor, insitu filter… The onboard PLC offers a large panel of IOs as required to handle blanketing regulator, breathing valve, safety relief valve…

The THMS is integrated in Australia by AquaGas for continuous and simultaneous measurement of VOC, NH3, CO, CO2, LEL, CxHy, H2S and O2 inside tank headspaces.

Advantages of AquaGas THMS

The AquaGas THMS is a cost efficient and safe solution available in a compact wall mount IP56 enclosure that totally eliminates the need for multiple sensors and probes. The sampling probe can be mounted directly into the vessel or blanketing gas discharge piping and is rated for high dust, moisture or solvents loads. A retractable filter assembly allows cleaning of the sampling probe without the need for dismounting the probe from its matching flange. Zero calibration is performed automatically on a daily basis while span gas calibration is only required quarterly. In very critical applications, the system can be equipped with redundant probes and or sensors for additional safety and self check purposes. Compared to traditional analyser technology, the AquaGas THMS is available at only a fraction of the costs. The most valued perceived benefit however is the significant increase of safety, enormous savings on tank maintenance as well as the optimised process operations.


Integrated Systems and Customised Services

For better environmental performances.


    Ammonium, Free or Total Chlorine, Hydrazine, Morphine, Phenol, Sulfates, Colour, Silica, Phosphates (Orthophosphates), Hardness, Aluminium, Chromium VI, Iron, Nickel, Lead, Zinc, TH, Alkalinity, Chlorides, Cyanides, Fluorides, Peracetic acid VFA, CaM…

    SERES® online water quality analyser offers multiple sensor and method configurations. Here are the typical  measuring parameter calibrated on the TOPAZ unit. For other parameters or different measuring ranges (MR), please consult us.


    NO, NO2, NOx, SO2, CO, HCl, CO2, H2O, H2S, NH3, N2O, COS, SO3, CH4, HF, HCN, H2…
    Our strong partnerships implemented with world leading CEMS and Process gas analyser manufacturers as well as local distributors,  provide AquaGas with an extensive range of technologies, diverse measuring principle and sampling methods to design and build cost effective, versatile and high performance systems composed of instruments specifically selected  in consideration of the applications.


    Data Aquisition Software (CDAS) is a fully MCERTS accredited (parts A, B, C1 & C2) real time data acquisition software – now available for touch screens and windows 10. CDAS is customisable and flexible, allowing it to collect raw data from a range of instruments for CEMS


    Isokinetic sampler developed for short to medium term emissions monitoring, fulfilling all the requirements of the dioxins and persistent organic compounds (POPs), PCBs, metals, HCB and fine dust measurement standard within the same sampling train


    O2, CO, CO2, NO, NO2, SO2, H2S, H2, CL2, N2O and VOCs

    Professional flue gas analyser combining high quality of sample conditioning with great measurement accuracy for continuous emissions monitoring or online process measurement of up to 9 gases simultaneously.


Stack Testing

Ankersmid Sampling

APS Portable Gas Sampling System

The emission of pollutants resulting from a multitude of activities (industry, transport, …) alters the atmospheric composition and degrade air quality. Control of gaseous pollutant emissions in the atmosphere has become a major challenge for the protection of human health and the environment. To avoid these risks, the regulation has established discharge limits thresholds for certain pollutants and requires periodic inspections whose frequency depends on the type of activity (from 3 months to 3 years). Accredited stack testing companies are responsible for conducting short to medium term environmental compliance monitoring tasks in a wide range of industries and processes such as power plants and large manufacturing facilities including paper mill, foundry, waste recycling facilities,  refineries…

Prior to be analysed, the gas extracted from the discharge stack or process duct requires delicate conditioning which mainly consist of particulate filtration and moisture removal. Failure to achieve an efficient sample preparation can results in inaccurate measurements, loss of data or damaged equipment.

While stack testers and local authorities are continuously devoting time and knowledge to optimise the methods and protocols related to short to medium terms mandatory analysis campaign, ANKERSMID® has invested its long time expertise in developing the APS Portable Gas Conditioning Systems in direct collaboration with  leading stack testing companies.

As a result, ANKERSMID® Portable Sampling System APS provides stack testers with  features tailored to short term source testing in a robust and light weight design. The complete systems responds to today’s demand in terms of operation and compliance.


Portable Sampling System APS

ANKERSMID® Portable Sampling System APS is a complete gas sampling train composed of:

  • APP Heated Gas Sampling probe

    High temperature filtration

  • AHL Heated Gas Sample line

    Fast and reliable sample gas transfer

  • APS Gas Sampling System

    Accurate and performant gas conditioning

APP Portable Heated Gas Sampling Probe

The APP Heated Gas Sampling Probe is a light weight sampling gun enabling high temperature filtration directly at the sampling point.

Portable probe APP trans 2

The probe is heated up to 180°C in order to maintain the sample temperature above acid gases dew point. A filter element of 150 mm is integrated, suitable for most applications up to 1g of dust per cubic meter of emissions. Thanks to its design, the filter can be replaced or checked without the need of dismounting the probe. For applications where the dust load reaches 10 g/m³, a blow-back option can be fitted. Calibration gas can be injected directly into the probe through the calibration gas port according to emission monitoring standards enforcing test gas feeding via the probe’s filter element.


180°C operating temperature

Integrated over temperature safety switch

Low temperature alarm contact

Test gas port according to EN14181 available as standard

Light weight

Ready to operate in 15 minutes

Low and Easy maintenance

Universal mounting clamp for heated line

Compact design and universal applicability, easy handling with mounting eye on housing (2m chain incl.)

APP150 Portable heavy duty ABS case for safe transport

AHL Heated Sample Line

AHL Heatedline-v2

The AHL Heated sample line is perfectly suited to mobile applications. It features a highly flexible smooth silicon outer jacket and can be fitted with options enabling efficient installation and operation:

  • Quick connect fittings at both ends: stainless steel pressure release connector directly inserted into the heated lines hard cap terminations (no cold spot)
  • Built-in cable with plugs to feed the APP sampling probe with power – No additional cable or power source required at the sampling location.
  • Additional inner tubes for test gas (calibration via probe filter) or compressed air (back-flush)

APS Portable Gas Conditioning System


portable conditioning 3xx 2

The APS portable sampling system is designed so that detailed gas analysis can be carried out at any time in any place. The entire sampling system is housed in a compact and robust carrying case which ensures safe transport and easy set-up. All the components can be easily accessed for inspection or routine maintenance. The APS concept allows you to perform gas analysis in an efficient manner, safely and with a minimum of maintenance. This system ensures reliable sample preparation without loss and prevents damage on the downstream analysis system. It is suitable for a large range of applications and has already been adopted by many stack testers around the world.


Fully automated

Moisture alarm (detection of sample condensates)

Extremely stable dew point +/-1 degree C

Optimal reliability

Compact and robust design

Light weight

Ready to operate in 15 minutes

Low and Easy maintenance

PFA coated heat exchanger

PTFE coated sampling pump

Preliminary sample filter

Built-in temperature controller for the heated line

AquaGas Pty Ltd

Integrated high performance monitoring solutions


AquaGas Pty Ltd has the tools and technologies needed to accurately measure atmospheric emissions of gaseous pollutants helping you in improving air quality and environmental performances.

  • Portable Gas Analysers

    Multigas analysers fitted with a combination of proprietary gas cells for short term monitoring of biogas, syngas and combustion processes.

  • Isokinetic Sampling Console

    Isokinetic sampler developed for short to medium term emissions monitoring, fulfilling all the requirements of the dioxins and persistent organic compounds (POPs), PCBs, metals, HCB and fine dust measurement standard within the same sampling train

  • Data Acquisition and reporting Software

    Data Aquisition Software (CDAS) is a fully MCERTS accredited (parts A, B, C1 & C2) real time data acquisition software – now available for touch screens and windows 10. CDAS is customisable and flexible, allowing it to collect raw data from a range of instruments for CEMS


Ankersmid Sampling

ANKERSMID® , well-known in the monitoring industry as Ankersmid M&C, has the benefits of 30 years of experience in developing state of the art gas sampling and gas conditioning equipment tailored to CEMS (Continuous Emissions Monitoring Systems) and stack testing (short to medium term measurements). Subsidiaries in several countries (Netherlands, France, China, Roumania, Germany, Korea…) and more than 100 employees world-wide place ANKERSMID® in a leading position within the field of environmental monitoring and process control instrumentation.

Indoor air quality


Air Quality in Submarines

The last generation of conventional submarines allows several weeks of submersion, creating a need for regenerative air purification methods and new air monitoring instruments. Submarine air is a complex mixture of compounds, where the most obvious contaminant is metabolically produced carbon dioxide. Normal eight-hour occupational exposure limits are not applicable on a submarine, instead special long-time exposure limits are set.

A number of air purification methods for submarines are either available or under development, e.g. cryogenic plants, biological plants and solid amine plants. For air monitoring, the OFCEAS method is an interesting option, already in use on-board nuclear submarines.

The main contaminant of submarine air is CO2. In ordinary buildings 1000 ppm is usually considered as a maximum concentration. This value is not based on health effects but on the rate of ventilation. In submarines, higher CO2 concentrations are permitted, usually 5000- 7000 ppm. A submarine atmosphere consists of a large number of contaminants such as ozone, which can be formed in electrical devices and hydrogen, which is formed when the batteries are charged.

To ensure the health of the crew on short and long term, it is important to specify the permitted composition of the submarine atmosphere.


Table 1 shows a submarine air specification for a conventional submarine.

Compounds Limit Compounds Limit
NO2 5 ppm NH3 25 ppm
CO2 8 000 ppm O3 0.1 ppm
CO 35 ppm H2 2 %
SO2 2 ppm CL2 1 ppm
Formaldehyde 2 ppm H2O2 1 ppm
Akrolein 0.1 ppm


Since the crew is continuously exposed to the submarine air for several weeks, normal eight hour occupational exposure levels are not applicable and special exposure limits must be determined. Maximum Permissible Concentrations (MPC) are set for an exposure time of 90 days for a number of compounds likely to be found in a submarine. They have also set emergency MPC’s for 24 h and 60 min.

The ProCeas® NAV

The ProCeas® NAV is designed for online monitoring of CO2, CO, Freon, H2S, H2, O2, Formaldehyde (…) in nuclear and conventional submarines. The ProCeas® NAV uses the OFCEAS method commercialized by Ap2e of France.

ap2e-CEMS and Process Analysers

The OFCEAS system uses a high-finesse optical cavity to provide path lengths of tens of kilometres. Moreover the OFCEAS technology can also, in certain configurations, take advantage of broadband light sources to provide multi-component analysis, while offering improved sensitivity when compared with shorter path-length methods, such as Tunable Diode Laser absorption spectroscopy (TDLAS).

ProCeasNAV-indoor air quality in submarines

The ProCeas® NAV analyser has been designed to endure large temperature variations, high vibrations and englobes all criteria required by the military environment to assure long-term crew member health in a confined environment.

Some of the gases and measuring ranges available on the ProCeas® NAV are:

Carbon Monoxide CO: 0-1000 ppm – Lower Detection Limit: 1 ppm

Carbon Dioxyde CO2: 0-5% – Lower Detection Limit: 0.01 %

Hydrogen Sulfide H2S: 0-10 ppm – Lower Detection Limit: 0.1 ppm

Freon; R134a and R404: 0-1000 ppm – Lower Detection Limit: 2 ppm

Ethanol C3H6O 0-2000 ppm – Lower Detection Limit: 4 ppm

General characteristics

Response time < 10 sec

No Zero drift and no Span drift – No daily calibration required – No nitrogen, zero air, purge or other carrier gas.

Weight 15 to 20 kg

Dimensions 480 x 240 x 150 cm

Formaldehyde in Indoor Air


For continuous ambient and indoor air quality monitoring (real time at ppb levels), the ProCeas® spectrometer is equipped with a laser at a single wavelength used to determine the concentration of a specific compound with an extremely low detection limit and fast response time. The OFCEAS extended optical path and continuous signal feedback provide a high definition spectral response using what is essentially a traditional absorption measurement.


ProCeas® Formaldehyde at HUTCHINSON

As per the international OH&S regulations on Formaldehyde, Hutchinson, subsidiary of TOTAL, evaluated several technologies to implement continuous real-time monitoring of Formaldehyde at their Plant facilities.

The ProCeas® has been selected by Hutchinson as the technology the most suited to their monitoring needs in terms of response time, accuracy and flexibility around the integration within the mainstream of their installation.

Hutchinson uses the ProCeas® to measure various level of Formaldehyde in the air at 3 separated sampling locations: laboratory, offices & entrance hall.


ProCeas Key features

  • Low detection level
  • Complete pre-calibrated laser infra-red spectrometer
  • Reduced response-time with Low pressure sampling system
  • Suitable for a wide range of components in ambient air: NH3, O2, H2, H2S, HCFC, VOCs, (…)

Example of performances for the Formaldehyde

Measuring range: 0-10 ppm (up to 1%)

Lower detection limit: 1 ppb – (10 ppm at 1%)

Response time 2s

No Zero drift and no Span drift – No daily calibration required – No nitrogen, zero air, purge or other carrier gas.

Area Monitors for Sterilant Gas

Hazards of sterilant gases

Since sterilant gases are selected to destroy a wide range of biological life forms, any gas which is suitable for sterilisation will present a hazard to personnel exposed to it. The NIOSH Immediately Dangerous to Life and Health values (IDLH) for the three sterilant gases are 800 ppm, 75 ppm and 5 ppm for ethylene oxide, hydrogen peroxide and ozone respectively.

For comparison, the IDLH of cyanide gas (hydrogen cyanide) is 50 ppm. Thus exposure to even low levels of sterilant gas should not be treated casually and most facilities go to great lengths to adequately protect their employees. In addition sterilizers (as with any mechanical device) can and sometimes do fail and leaks have been reported. Continuous gas monitors are used as part of an overall safety program to provide a prompt alert to nearby workers in the event that there is a leak of the sterilant gas.Steri-Trac Area Monitors - sterilant gas - AquaGas

Monitoring Sterilant

The monitor alarms are typically set to warn if the concentrations exceed the OSHA permissible exposure limits (PELs), 1.0 ppm for ethylene oxide and 1.0 and 0.1 ppm for OH&S and ozone respectively. The PELs are calculated as 8 hour time weighted average values.

In addition to providing continuous monitoring, the better gas monitors include a computer based data acquisition system provides automatic data logging to assist with compliance with OSHA’s regulations and impending alarms that allow users to rectify problems before they become a hazard.

There are several technologies that are commonly used for the detection of sterilant gases, the main three being electrochemical, gas chromatography and metal oxide semiconductor. All three technologies are suitable for ethylene oxide, but only electrochemical sensors are used for hydrogen peroxide and ozone detection.

For ethylene oxide, metal oxide electrochemical sensors provide a low cost, long life detector offer very good sensitivity, fast alarm response times and small size. ChemDAQ gas monitor manufacturers mainly use electrochemical sensors for toxic gases because of their many advantages.

Electrochemical sensors have traditionally suffered from a cross sensitivity problems with other vapours (alcohols are especially troublesome in health care). Cross sensitivity results in false alarms, unnecessary evacuations and eventually a loss of confidence in the gas monitoring system.

AquaGas - ChemDag - Steri-trac

ChemDAQ has developed a proprietary chemical filter that allows the ethylene oxide to pass through but removes most common interferent gases and vapours (including carbon monoxide, ethanol and IPA). The use of this filter allow the ethylene oxide to be detected with all the advantages that electrochemical sensors have to offer, but without the problems of cross sensitivity.



AquaGas is supporting the global industrial community with high performance environmental and process monitoring systems (Continuous Emissions Monitoring Systems, Air Quality Monitoring Systems, Online process analysers, Water Quality Monitoring Systems) specifically designed and built to meet your application requirements.