Solution for
decarbonization technologies

Real Time
Gas Monitoring

Semi-custom made
possible with Riken Keiki


RTGMS is a semi-custom made system that combines
Riken Keiki's proprietary gas detection and alarm units with calorimeters.

By combining our existing gas detection and alarm units with calorimeters,
we have managed to produce gas monitors that meet the requirements of customers.

Examples of fields where a
RTGMS makes a difference


Advantages of an RTGMS

As the system is based on gas detectors and calorimeters,

  • Continuous analysis is possible* Analysis is the measurement of the constituent ratios of the measured gases.
  • Protective grade optimized for the site (Explosion proof, etc.)
  • As the system is order-made, only the minimum necessary features are included
  • Easy for maintenance
  • Lower cost than common analyzers for the same gas
  • Few replacement and consumables parts , low cost just like gas detectors

Customization Examples


Component analysis of iron and steel gases: monitoring of composition of CO, CO2, H2, CH4 and N2 mixed gas

Compositional Analysis of Iron and Steel Gases
<Background of the Inquiry>
The user's existing calorimeter required a lot of maintenance (cleaning and adjustment), while its operation was labor-intensive.  In addition, as the flow rate required for measurement is large, the preprocessing unit is large and costs a lot to update.
<Customers' trouble>
In this market, there are cases where the measured gas contains large amounts of naphthalene, which degrades combustion-type sensors and other equipment. The performance of the sensors can be restored over a certain period of time through cleaning and re-adjustment, but person-hours and costs were being incurred for this maintenance and upkeep. Cleaning in particular was problematic, as the process takes some getting used to, and the frequency increases depending on the season.
<Riken Keiki's Monitoring System>
No catalytic combustion or separate column is needed, the opt--sonic method using a physical sensor requires no cleaning or adjustment. Even for preprocessing the unit is comparatively smaller and involves simple maintenance and upkeep.
In addition, and optional infrared sensor can be added to enable compositional analysis.
Not only reducing running costs and operating person-hours, but also an increase in new monitoring items similar to what an analyzer produces for compositional analysis, this is expected to facilitate stepped-up process management in the next generation.
Efficiently Suppressing Black Smoke Emissions from a Flare Stack (Flare Gas)
<Background of the Inquiry>
As part of the trend toward decarbonization, progress is being made in the recapturing of flare gas. However, while plant operators strive to waste as little gas as possible, when trouble occurs or periodic repairs are being performed, it is often necessary to treat flare gas, a component that is the cause of considerable black smoke emissions.
Environmental emissions have been repeatedly considered and many efforts have been made to prevent the release of black smoke even in these cases, but to take further action, it is necessary to implement appropriate additional measures based on the concentration of the flare gas itself and the quantity of heat it produces.
<Customers' trouble>
At the user's chemical plant, surplus gas is detoxified and released into the atmosphere after combustion, but black smoke is generated due to the calorific value of the discharged gases. For this reason, the user needed to make efforts to blow in and mix a quantity of steam or water that is appropriate for the calorific value of the discharged gases to prevent the release of black smoke, but since the composition of the gas fluctuates, it is necessary to control the mixture amount using a machine capable of taking real-time measurements. As there is a time lag in measurements from analysis equipment, real-time measurements cannot be obtained. As the composition of the gases to be measured was complex, the user found if difficult to take measurements using other calorimeters.
<Riken Keiki's Monitoring System>
The OHC-800 is equipped with a optical sensor and a sonic sensor. Even the composition is complicated, complex calculation is performed based on the measurement results from each sensor, and give the thermal value with little error. Additionally, real-time measurement is available to control (mixing of steam and water) that responds quickly to changes in the calorific value of the target gas is possible, contributing to effective suppression of black smoke emissions.


Fuel composition ratio analysis for Power to Gas - natural gas + hydrogen mixed gas, etc.

Hydrogen Mixed Combustion Turbine, Single Fuel Turbine (H2, Natural Gas, N2, etc.)
<Background of the Inquiry>
Trends in decarbonization to prevent climate change are accelerating, and green energy (energy that produces zero CO2 emissions) is attracting attention. One form of green energy is hydrogen, and with demonstrations involving the use of hydrogen proceeding around the world, the user has been working on the development of a hydrogen-fueled turbine. To control the turbine, the user needed a calorimeter able to handle fluctuations in natural gas + hydrogen from 0 - 100%.
<Customers' trouble>
The user has equipment capable of measuring the calorific value of only natural gas in real-time, but found it difficult to find a device capable of measuring natural gas +  hydrogen to a high level of precision in real-time.
<Riken Keiki's Monitoring System>
If a site has two lines for hydrogen and natural gas, as it is possible to measure the calorific value of natural gas + hydrogen (fluctuating between 0 and 100%) at high-precision and in real-time, everything from turbine start-up to control can be handled. (Turbine start-up is performed with natural gas alone, and then the concentration of hydrogen is gradually raised)


Methanation - monitoring the composition of H2, CH4 and CO2 mixed gas
Ammonia synthesis and decomposition - monitoring the composition of N2, H2 and NH3 mixed gas

Compositional analysis of methanation equipment processes (CO2, CH4, H2, N2)
<Background of the Inquiry>
The user had been developing a methanation equipment as part of decarbonization technology. It was necessary to monitor the operation of the methanation equipment as demonstration testing, and the gas at the outlet of the unit was analyzed.
A large amount was recorded in the budget for an analyzer, and the user tolerated vacant times between  one analysis period to the next. 
These had been issues for the public implementation of the methanation equipment.
<Customers' trouble>
The high price put pressure on the cost of the equipment. Since it is not a continuous measurement, it was worried that the control would be very rough.
Helium gas was difficult to obtain, and maintenance and other consumables were expensive, reducing the cost advantage of methanation equipment.
<Riken Keiki's Monitoring System>
Concentration calculation of each of the four gas from the mixed gas is availalble. Continuous measurement with fast response speed. High precision.
No carrier gas or consumables parts are required, keeping running costs low.
Compositional Analysis of Ammonia Manufacturing Equipment Processes (N2, H2, NH3)
<Background of the Inquiry>
A manufacturer of equipment to synthesize N2 and H2 to produce NH3 was seeking a gas monitor for equipment control. The required process was to monitor the completed gas, and when gas that has not been completely synthesized is detected, to recirculate it into the unit inlet for synthesis again.
<Customers' trouble>
Although compositional analysis can be performed using an analyzer, for control purposes the analysis time becomes an issue. In addition, a panel and small booth to house the analyzer is required, making design for customers with many small sites difficult.
<Riken Keiki's Monitoring System>
3 gases can be measured from a mixed gas.Continuous measurement with a quick response. High precision.
No carrier gas or consumable parts are required, make a low running costs. Detectors are ex-proof, and equipped with a cover to provide protection from wind, rain and direct sunlight. Since the running costs are low as explained above, there is no need to house the unit indoors, making it a good match for small-scale sites.


Detection of lower explosive limit in mixed solvents and composition analysis

Detection of lower explosive limit and compositional analysis for mixed solvents with changing composition
<Background of the Inquiry>
A request was received from a customer wisehing to continuously monitor the respective concentrations and lower explosive limits of two solvents contained in the air produced from a product manufacturing process.
Presently, the customer periodically takes samples of the gas and monitors concentrations using an analyzer. In the interests of product manufacturing quality and safety monitoring, the customer wants to take measurements in real-time.
<Customers' trouble>
The two types of two solvents, each having differing lower explosive limit concentrations, and their mixture ratios fluctuate considerably depending on the operational state of the manufacturing process.
The customer faced the problem of not being able to measure the lower explosive limit concentration of the mixture with its fluctuating mixture ratios using a single sensor.
<Riken Keiki's Monitoring System>
It is found that the output ratio between an infrared sensor and refractive index sensor correlates to the lower explosive limit concentration of the solvent mixture. Using this knowledge, we built a system to accurately calculate lower explosive limit concentrations.


Safety management of loading arm for ships - LNG

Gas Detector for LNG Loading Arm
<Background of the Inquiry>
A user was employing an infrared flammable gas detector to check the timing of loading arm disengagement during unloading from an LNG tanker to an LNG terminal. Before the arm is disengaged, nitrogen gas is introduced to lower the concentration of flammable gas.
However, immediately before disengagement (the final stage of the task), the vaporized LNG gas present in the piping becomes heavier compared with immediately after unloading, resulting in increased sensitivity to infrared flammable gas sensors. In other words, the sensor system gives instructions that correspond to a higher concentration of LNG than is actually present, and this results in excessive nitrogen replacement continuing. These conditions cannot be visualized using an infrared flammable gas detector. By determining the true concentration and reducing the amount of nitrogen introduced for replacement, the disengagement standby period can be reduced.
The user desired measurement equipment that can determine the true lower explosive limit of vaporized LNG gas whose concentration within nitrogen fluctuates.
<Customers' trouble>
The user was unable to determine the true lower explosive limit of vaporized LNG gas that becomes heavier, resulting in the excessive use of time and nitrogen for replacement.
<Riken Keiki's Monitoring System>
Our system simultaneously measures gas mixtures of nitrogen and vaporized LNG gas using two types of physical sensors, Optical sensor and thermal conduct sensor, and derives the true lower explosive limit of the hydrocarbon gases in the nitrogen based on the differences in each sensor's output. The lightwave interference-type sensor experiences increased sensor output as the gas mixture becomes heavier, while the thermal conduction-type sensor experiences reduced sensor output when the same occurs. Utilizing the differing characteristics of these sensors, the true lower explosive limit of vaporized LNG gas that gradually becomes heavier can be continuously derived based on the output ratio between both sensors.

About us

Since our company was founded in 1939 under the umbrella conglomerate of RIKEN, our management philosophy has been to create safe working environments. Our science and technology research laboratories have developed industrial gas detection warning devices, specializing in monitoring harmful gases in the work environment, as well as for explosion prevention from combustible gases. Without compromise, we continue to challenge ourselves to be technological leaders, developing and manufacturing a wide range of industrial gas detection systems and monitors. From large-scale gas detecting alarm systems to small-sized personal gas monitors for safety protection; used in many industries including semiconductor and LCD plants, petroleum complexes, steelworks, various tankers, oil storage stations, underground gas facilities, and volcanoes.

image for over 80 years

Experts in gas detection for over 80 years

The “RIKEN Gas Detector” utilizing the principle of light wave interference, was exhibited at the 1937 Paris World Exposition. Its subsequent use greatly contributed to the prevention of accidents in coal mines where many fatalities were prevalent at the time. On the 15th March 2019 we celebrated our 80th anniversary. Supported by our history and tradition we shall further improve long established technology, and continue to innovative. Developing reliable quality products in response to the diverse needs of industry.

Extensive international network
for reliable and complete support

Utilizing our established overseas network, you could purchase
our product and services all over the world.

If you require a gas analyzer or gas detector, please contact us for a consultation.

If you provide us with this information, we will consider it and get back to you in two weeks with a response on feasibility and an estimated price.

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