理研計器 List of Products and Services

The "GX-9000 Series" is a portable gas detector capable of simultaneously detecting up to six types of gases (HC/CH4/H2, O2, CO, H2S, CO2, NH3, VOC, etc.). 【Features】 ■ Detects up to six types: HC/CH4/H2, O2, CO, H2S, CO2, NH3, VOC, etc. ■ Equipped with many convenient features such as multilingual display and combustible gas conversion function ■ Bluetooth enabled! Easy data management via smartphone (optional) ■ Sensor warranty of up to three years ■ Passes a 1.5m drop test ■ Protection rating equivalent to IP66/68 *For more details, please refer to the PDF document or feel free to contact us.

• Tunnel construction
• Sewerage facilities
• Gas leak device

The "GX-Force" is a portable gas detector that can simultaneously detect up to four types of gases (flammable gases/oxygen/carbon monoxide/hydrogen sulfide). 【Features】 ■ Lightweight design of approximately 300g with an easy-to-grip design ■ 3-year sensor warranty ■ Intrinsically safe explosion-proof structure and pressure-resistant explosion-proof structure ■ Continuous usage time of approximately 30 hours ■ Passed a 3m drop test ■ Protection rating equivalent to IP67 *For more details, please refer to the PDF document or feel free to contact us.

• Tunnel construction
• Sewerage facilities
• Disaster prevention supplies

The "GP-148" is a combustible gas detection alarm for the detection unit that uses a combustible gas sensor. With features that are "easy to see," "easy to use," and "reliable even during power outages," this single unit can accommodate various applications and the required number of units, meeting diverse combustible gas field needs. 【Features】 ■ Easy to see: Detection status is immediately clear ■ Easy to use: Simple operation! ■ Reliable even during power outages: Built-in backup power allows for over three days of gas leak monitoring during outages. Peace of mind in case of emergencies. *For more details, please refer to the PDF document or feel free to contact us.

• Gas leak device
• Hydrogen storage and supply

The "GP-310" is a gas detection alarm that is ideal for detecting leaks of commercial LP gas. It enables leak detection of LP gas at up to three locations, such as vaporizers and restaurant kitchens, with a single unit. It is maintenance-free for five years, making management easy. 【Features】 - The gas detector can be selected according to application from the dustproof and drip-proof "GP-310-D" and the explosion-proof "GD-A80." - It notifies gas concentration levels with a highly visible LED lamp. - The GP-310-D has a dustproof and drip-proof structure equivalent to IP55. - It is equipped with a highly durable and long-lasting sensor. *For more details, please refer to the PDF document or feel free to contact us.

• Gas leak device

The "GX-3R" is a portable gas monitor with a compact design that does not interfere with work. It features a rugged design that can withstand a 7m drop test, making it safe for use in high-altitude work. The newly developed CO sensor reduces the interference effects of hydrogen. Equipped with a variety of functions for safety, it is effective in various fields, including construction, gas plants, and steel manufacturing. 【Features】 ■ Compact design that does not interfere with work ■ Equipped with a high-performance new R sensor ■ Rugged design that can withstand a 7m drop test ■ Safety checks before entering pits are possible using a suction unit ■ The newly developed CO sensor reduces the interference effects of hydrogen *For more details, please refer to the PDF document or feel free to contact us.

• Tunnel construction
• Sewerage facilities
• Waste treatment facilities

The "GX-3R Pro" is a Bluetooth-enabled portable gas monitor. It features sensors for combustible gases, oxygen, carbon monoxide, hydrogen sulfide, as well as carbon dioxide, nitrogen dioxide, and sulfur dioxide, which can be selected according to your needs. Additionally, it is equipped with a high-performance new R sensor that significantly improves the performance of conventional sensors, and the sensors come with a three-year warranty for your peace of mind. 【Features】 ■ Bluetooth compatible ■ Can detect 5 components (4 components + 1 additional component) ■ Can use both rechargeable and dry batteries ■ Supports display in 11 languages ■ Easy-to-read full dot display ■ Equipped with a new R sensor with excellent long-term stability *For more details, please refer to the PDF document or feel free to contact us.

• Tunnel construction
• Sewerage facilities
• Waste treatment facilities

The "GW-3" is a portable gas monitor with a compact and lightweight design that can be worn directly. It features an intrinsically safe explosion-proof structure (domestic explosion-proof/ATEX/IECEx), making it suitable for use in hazardous locations. The protection rating is equivalent to IP66/68 (2m, 1h), providing a dustproof and waterproof structure that is safe for outdoor work. Additionally, the gases that can be detected include oxygen (using a potentiostatic electrochemical method) with the "GW-3(OX)", as well as a rich lineup including "GW-3(O2)" and "GW-3(HS)". 【Features】 ■ Compact and lightweight design weighing only 45g ■ Alerts for gas detection through a buzzer, lamp, and vibration ■ Equipped with a high-performance, durable new R sensor ■ Safe design for use anywhere *For more details, please refer to the PDF document or feel free to contact us.

• Tunnel construction
• Sewerage facilities
• Waste treatment facilities

The "04 Series" is a portable gas monitor equipped with a new high-performance, high-durability R sensor. In the event of accidental drops during high-altitude work, the risk of malfunction is minimal, allowing for safe use. Additionally, models such as "OX-04G," "CO-04," and "HS-04" achieve a long continuous usage time of 9000 hours, and we offer a lineup of sensors with some of the longest continuous usage times in the world, including "OX-04" and "CO-04(C-)." 【Features】 ■ Passes 7m drop durability tests ■ Equipped with a high-performance, high-durability new R sensor ■ Safe design for use anywhere ■ Power supply options available with rechargeable batteries or dry batteries *For more details, please refer to the PDF document or feel free to contact us.

• Tunnel construction
• Sewerage facilities
• Waste treatment facilities

The "CO-04BT(C-)/CX-04BT" is a portable gas monitor that can communicate with smartphones and tablets using Bluetooth. It has a protection rating equivalent to IP66/67, ensuring a dustproof and waterproof structure suitable for outdoor work. It can be used in a wide temperature range (-40 to +60°C). Additionally, it boasts excellent durability and performance, with a 3-year sensor warranty, and is compatible with a heat-resistant case, making it safe for use in the steel and iron market. 【Features】 ■ Equipped with Bluetooth ■ Performance improvement with newly developed R sensor ■ Safe design for use anywhere ■ Power supply options available with rechargeable batteries or dry batteries *For more details, please refer to the PDF materials or feel free to contact us.

• Tunnel construction
• Sewerage facilities
• Waste treatment facilities

The "OX-08" is a portable oxygen monitor that can be submerged. With sensor replacement every two years, it significantly reduces running costs. It can be continuously used for approximately 20,000 hours (about 2 years) with two AA alkaline batteries. Additionally, it features a dustproof and waterproof structure equivalent to protection class IP67, including the sensor, and is suitable for pre-work measurements due to its submersible design. 【Features】 ■ 2-year sensor warranty ■ Significantly reduced running costs ■ Continuous usage time of approximately 20,000 hours (about 2 years) ■ Submersible sensor suitable for pre-work measurements ■ Real-time measurements possible by securing the cable sensor to the winding section ■ Dustproof and waterproof structure (equivalent to protection class IP67), including the sensor *For more details, please refer to the PDF document or feel free to contact us.

• Electrical Equipment Testing

The "GX-2100" is a hazardous gas detector designed for manhole and pit work, capable of directly detecting gas with its sensing unit. It is equipped with an external alarm function in the sensing unit, eliminating the need for a separate external alarm device, thus reducing the effort for installation and retrieval by half. Additionally, the carbon monoxide sensor and hydrogen sulfide sensor are structured in a 2-in-1 design, allowing three sensors to detect four components: methane, oxygen, carbon monoxide, and hydrogen sulfide. 【Features】 ■ Significant increase in work efficiency ■ Equipped with a new R sensor (3-year sensor warranty) ■ Enhanced safety features for on-site workers ■ Bluetooth functionality (optional) ■ Adopts a diffusion-type sensing unit integrated with the external alarm *For more details, please refer to the PDF document or feel free to contact us.

• Tunnel construction
• Sewerage facilities
• Waste treatment facilities

The "FP-31" is a formaldehyde detector designated by the Ministry of Health, Labour and Welfare. Simply set the detection TAB on the main unit to easily start measuring. With a large, easy-to-read digital display, you can directly read the concentration, and it features a reliable self-diagnosis function that alerts you to battery replacement or pump connection issues with a buzzer and screen display. 【Features】 ■ Simple measurement of formaldehyde ■ Easy operation for reliable safety confirmation ■ Extremely easy-to-read large screen display ■ Reliable self-diagnosis function with minimal interference ■ Designated product by the Ministry of Health, Labour and Welfare [Designation Number 2701] *For more details, please refer to the PDF document or feel free to contact us.

• others

The "CUB" is a personal PID monitor equipped with a photoionization detector (PID) suitable for VOC detection. It features the ability to read over 740 types of VOCs and toxic gases. The detection range can accommodate a wide spectrum from 0.001 ppm (1 ppb) to 5,000 ppm. It can be used continuously for 16 hours on battery power, and management via dedicated software is possible through PC connection. 【Features】 ■ Sensor structure with minimal humidity influence and resistance to dirt ■ Simple one-button operation ■ Large display with easy-to-understand digital readout ■ Dust and waterproof structure equivalent to protection class IP65 ■ Measurement results can be viewed in graph form *For more details, please refer to the PDF document or feel free to contact us.

• others

The "TIGER" is a VOC concentration meter equipped with a reading function for over 800 types of VOCs and toxic gases. It has a sensor structure that is minimally affected by humidity and is resistant to dirt. It can detect a wide range from 1 ppb to 20,000 ppm. With large, easy-to-use operation buttons and a slim design, it can be operated with one hand, making it suitable for various sites where toxic gases and VOC gases are used. Additionally, we have sample devices available, so please feel free to consult us. 【Features】 ■ Utilizes a PID that has demonstrated high performance ■ Fast response and recovery times ■ Equipped with a reading function for over 800 types of VOCs and toxic gases ■ User-friendly simple menu ■ Convenient backlit operation buttons for dark places *For more details, please refer to the PDF document or feel free to contact us.

• others

The "GX-6000" is a portable multi-gas monitor capable of simultaneously detecting up to six types of gases. Equipped with a PID sensor, it can also detect VOCs. It features two new functions for protecting worker safety: a panic alarm and a man-down alarm. With the ability to measure several types of gases with one device, it is effective for improving work efficiency and is suitable for the safety management of chemical substances that are subject to mandatory risk assessment. 【Features】 ■ Capable of simultaneously detecting up to six types of gases with one device ■ Equipped with a PID sensor for VOC detection ■ For self-management of hazardous chemicals ■ Japanese display available ■ Includes two new functions for protecting worker safety (panic alarm & man-down alarm) *For more details, please refer to the PDF document or feel free to contact us.

• others

The "SP-220 TYPE M" is a handy gas leak detector for city gas. With the built-in filter for removing impurities and improved sensors, durability has been enhanced. It can detect low concentrations of gas (10 ppm and above) and can accurately identify measurement points even in dark places. Additionally, we also offer the "SP-220 TYPE L" for LP gas and the "SP-220 TYPE ML," which is compatible with both city gas and LP gas. 【Features】 ■ Compact and lightweight yet tough body ■ Capable of quickly and reliably detecting minute gas leaks ■ Improved sensor durability ■ Equipped with data logging function ■ Includes LED light *For more details, please refer to the PDF document or feel free to contact us.

• others

The "SP-220 TYPE SC" is a handheld gas leak detector for semiconductor material gases. With a newly developed sensor, it can detect low concentration gases (from 0.1 ppm). It allows for accurate measurements even in dark places. Additionally, we also offer the "SP-220 TYPE FUM" for fumigation gases, which can switch between 7 types of fumigation gases or 40 types of semiconductor material gases. 【Features】 ■ Compact and lightweight yet tough body ■ Capable of quickly and reliably detecting low concentration gases ■ Direct detection of various gas concentrations with button operation ■ Equipped with data logging function ■ Includes LED light *For more details, please refer to the PDF document or feel free to contact us.

• others

The "SD-3 Series" is a stationary explosion-proof gas detector designed for continuous monitoring of flammable gases, toxic gases, and oxygen in the atmosphere. Since the sintered metal in the sensor part is no longer needed, it can detect various highly adsorbent toxic gases. In addition to obtaining explosion-proof certifications from various countries, it is a global product that conforms to various international standards, including IEC/EN performance and SIL2 certification (including planned compliance). 【Features】 ■ Equipped with a high-performance sensor "F Sensor," significantly improving both functionality and performance ■ Various output options available ■ A lineup of types that can accommodate various installation environments and applications ■ Compliant with various global standards ■ Robust housing structure that can withstand harsh environments *For more details, please refer to the PDF materials or feel free to contact us.

• Other measuring instruments
• Other analytical equipment

The "OX-600" is a compact oxygen monitor suitable for managing oxygen concentration in the atmosphere. You can choose from three specifications: "AC power supply," "DC power supply," and "dry battery specification," with cable lengths available in 3m, 5m, 10m, and 20m. Equipped with a pressure compensation sensor inside the unit, it ensures that there are no fluctuations in the indicated values due to changes in atmospheric pressure. 【Features】 ■ Large and easy-to-read LCD display with three-color backlighting ■ Pressure compensation function included ■ Three types of power supply specifications available ■ Continuous operation for about one year with two AA alkaline batteries ■ Remote sensor (sold separately) allows for measurements up to 20m away *For more details, please refer to the PDF document or feel free to contact us.

• others

The "EC-600" is a compact carbon monoxide monitor suitable for preventing carbon monoxide poisoning. It allows remote measurement of up to 20 meters with a remote sensor. You can install the sensor in areas where there is a risk of leakage and check the concentration values from a separate safe area. We offer four cable lengths: 3m, 5m, 10m, and 20m. You can choose from three types of power specifications: "AC power specification," "DC power specification," and "battery specification," making it compatible with the power specifications of the installation location. In the case of the battery specification, two AA batteries can be housed inside the main unit, so no extra space is required. 【Features】 ■ Large and easy-to-read LCD screen that lights up in three colors ■ Remote measurement of up to 20 meters with a remote sensor (sold separately) ■ Cables can be drawn out from all four sides of the main unit ■ Three types of power specifications available ■ Continuous operation for about one year with two AA alkaline batteries *For more details, please refer to the PDF document or feel free to contact us.

• others

The CO2 monitor "RI-600" can be used for CO2 measurement based on the Building Management Act and Office Sanitation Standards Regulations, as well as for air management in places where people gather, such as offices, classrooms, and conference rooms. It can also be used as a guideline for ventilation measures to prevent the spread of the new coronavirus. The detection principle is non-dispersive infrared absorption, with a contact capacity of AC125V・1A or DC30V・1A. Options such as mounting plates and power cables are also available. 【Features】 ■ Non-dispersive infrared absorption type ■ Compact and lightweight ■ Easy operation ■ Structure: Wall-mounted ■ Accessories ・Two round wood screws with cross holes for mounting ・Two pan head screws with cross holes for mounting *For more details, please refer to the PDF document or feel free to contact us.

• others

The "SD-1 Series" is a compact and lightweight smart-type gas detection unit, primarily suitable for safety and disaster prevention in oil refining and petrochemical plants. With a robust housing structure and a variety of options, it is designed for outdoor installation and can withstand harsh environments. By connecting to alarm units installed in safety locations and upper systems in central monitoring rooms or instrument rooms, it contributes to the establishment of a comprehensive disaster prevention system. Additionally, we offer a rich lineup for combustible gases, toxic gases (hydrogen sulfide/carbon monoxide), and oxygen. 【Features】 ■ Compact and lightweight smart type suitable for safety and disaster prevention ■ Rich lineup ■ Robust housing structure and diverse options ■ Suitable for outdoor installation and harsh environments *For more details, please refer to the PDF materials or feel free to contact us.

• others

The "OHC-800" is an explosion-proof calorimeter that is less susceptible to the effects of non-combustible gases and allows for high-precision measurements. Using an opto-sonic calculation method that combines optical sensors and sonic sensors, it enables highly accurate and reliable measurements. With a hydrogen explosion-proof structure (ExdIIB+H2 T4) and a dust and drip-proof structure (equivalent to IP66/IP67), it has a robust design that does not limit installation locations, and the power supply can be AC 100V to AC 240V / DC 24V. 【Features】 ■ Opto-sonic calculation method combining optical sensors and sonic sensors ■ Easy switching between calorific value (MJ/m3), specific gravity, and Wobbe index ■ Improved maintenance and serviceability ■ Housing structure that does not limit installation locations *For more details, please refer to the PDF document or feel free to contact us.

• others

The "FI-900" is an optical wave interference gas monitor that employs a sensor with 80 years of proven performance. It is capable of detecting corrosive gases such as NH3 and VCM. It features an enhanced self-diagnostic function and allows for the monitoring of not only gas concentration but also system status via MODBUS communication. With a pressure-resistant explosion-proof structure suitable for H2 environments, it is ideal for preventing VOC explosions, managing concentrations, and measuring hydrogen purity. 【Features】 ■ Utilizes a highly reliable optical wave interference sensor with 80 years of proven performance ■ Capable of detecting corrosive gases such as NH3 and VCM ■ Pressure-resistant explosion-proof structure suitable for H2 environments (domestic explosion-proof/ATEX/IECEx) ■ Enhanced self-diagnostic function, capable of monitoring both gas concentration and system status via MODBUS communication ■ Well-suited for preventing VOC explosions, managing concentrations, and measuring hydrogen purity *For more details, please refer to the PDF document or feel free to contact us.

• others

Our company has made "creating an environment where people can work with peace of mind" a permanent theme. We independently develop and produce industrial gas detectors and various gas sensors that continuously monitor the safety of operations and the maintenance of equipment in locations such as semiconductor and LCD factories, oil refineries, steelworks, various tankers, oil storage bases, underground gas facilities, volcanoes, and other sites where gas is consumed, produced, or stored, as well as where gas is generated. This booklet summarizes the principles of the gas sensors used in our gas detectors, an overview of other products we handle, and other sensors we have dealt with in the past. We invite you to read it. [Contents] ■ Application fields of gas sensors: For "creating an environment where people can work with peace of mind" ■ Introduction ■ Gas sensors ■ Other various measurement methods ■ Appendix *For more details, please refer to the PDF document or feel free to contact us.

• Other measuring instruments

Due to a malfunction of the electromagnetic valve in the cooling system of the meat processing plant, the compressor in the refrigeration unit was damaged, causing ammonia gas to flow and spread within the factory. After ventilating and evacuating the ammonia gas, work commenced, but due to insufficient removal of the ammonia gas, secondary damage occurred in the form of ammonia poisoning. Additionally, a maintenance worker who came into contact with a low-temperature object while closing the valve of the refrigeration unit suffered frostbite on their toes. 【Suggestions】 ■ By using gas detectors during regular patrol inspections, it is effective for confirming the safety of workers and for the early detection of ammonia gas leaks. *For more details, please refer to the PDF document or feel free to contact us.

• Measurement and Inspection

During the exchange of the gas cylinder, the spindle handle was left attached while moving, and when it hit the wall, the spindle opened, causing hydrogen sulfide gas to erupt. The victim collapsed on the spot and lost consciousness due to gas inhalation. They were discovered and rescued by colleagues who noticed the strange smell and were taken to the hospital. 【Suggestions】 ■ Workers should wear hydrogen sulfide monitors while working. ■ This allows for the early detection of any hydrogen sulfide leaks and can alert the worker and those nearby to the danger. *For more details, please refer to the PDF document or feel free to contact us.

• Measurement and Inspection

A sodium hypochlorite was taken out from the container in the sterilizing water generation device, and after removing mold from the walls and equipment in the cleaning room, the remaining sodium hypochlorite was accidentally placed into the neighboring hydrochloric acid container, resulting in the generation of chlorine gas. There were no individuals who felt unwell during the evacuation and handling due to the chlorine gas generation, but after returning home, a worker felt unwell and was transported to the emergency room. 【Suggestion】 ■ In addition to risk reduction measures, it is recommended to work while ensuring safety with a gas detection alarm. *For more details, please refer to the PDF document or feel free to contact us.

• Measurement and Inspection

In the membrane pre-cleaning process of the manufacturing process, a mixed solution M of sulfuric acid, hydrogen peroxide, and pure water was used, while a mixed solution N of phosphoric acid and hydrochloric acid was used for the marking process. Although solutions M and N were processed separately, hydrochloric acid gas was generated when solution N was accidentally poured into the poly tank designated for collecting solution M. The hydrochloric acid gas, which erupted as white smoke from the poly tank, spread into the clean room, causing three workers inside to complain of eye pain and seek treatment. [Recommendation] ■ It is recommended to install equipment that can quickly detect the leakage of toxic gases and issue alarms. *For more details, please refer to the PDF document or feel free to contact us.

• Measurement and Inspection

After a meeting regarding the baking and oxidation work conducted by the semiconductor manufacturer for maintenance, harmful substances were detected using a detection tube while measuring the residual harmful substances in the semiconductor manufacturing equipment. During this process, the harmful substances leaked, and the individual was affected while passing by the equipment. The affected person, after resting in the office for about an hour due to feeling unwell, received a consultation from the manufacturer's industrial physician. Following the industrial physician's instructions, they went to a university hospital for further examination, where they were diagnosed with acute drug poisoning and required a four-day hospitalization. 【Suggestion】 ■ It is recommended to use gas monitors to check environmental concentrations before work, confirm leakage during work, and verify restoration to original conditions after work. *For more details, please refer to the PDF document or feel free to contact us.

• Measurement and Inspection

Two workers used a mixture of epoxy resin and hardener as a topcoat for waterproofing the inner wall of the water distribution tank. During the work, they operated a ventilation system and wore organic solvent respirators. However, the generator used to operate the ventilation system stopped blowing air due to fuel consumption, and the absorption canisters of the respirators had exceeded their breakthrough time, leading to an incident. The next day, two workers were found collapsed inside the tank by their colleagues. After being rescued, both regained consciousness but were diagnosed with organic solvent poisoning and required hospitalization for treatment. [Recommendations] - Use gas detectors to confirm the effectiveness of ventilation. - Work while checking safety with portable gas monitors. *For more details, please refer to the PDF document or feel free to contact us.*

• Measurement and Inspection

During the research process of the spice, the victim placed waste liquid containing phosphoric chloride, which was used as a reagent, into a waste tank filled with water for fire prevention. This caused a reaction with the water in the tank, resulting in the release of chlorine gas, leading to exposure. The victim was transported to the hospital by ambulance and was diagnosed with "chlorine gas poisoning and symptoms of chemical conjunctivitis," resulting in hospitalization. [Recommendation] ■ In addition to risk reduction measures, it is recommended to work while ensuring safety with a gas detection alarm. *For more details, please refer to the PDF document or feel free to contact us.

• Measurement and Inspection

On the day before, gas concentration measurements were conducted in the cargo hold where fumigation had taken place, under the supervision of a quarantine officer. As a result, the effectiveness of the fumigation was confirmed, and the opening work for the hatches of each cargo hold began. Since the victim had not returned, a search was conducted, and it was discovered that there was an access hatch on the deck that was left open. Looking down from there, the victim was found lying on their back with a gas mask on. Although gas measurements were taken for the fumigation, oxygen concentration was not measured, leading to a state of asphyxiation, and the victim died due to oxygen deficiency. [Proposal] ■ For safety confirmation, it is recommended to use a portable gas monitor capable of detecting multiple gases with one device. *For more details, please refer to the PDF document or feel free to contact us.

• Measurement and Inspection

In the electrical room, the main power was turned on, the main circuit switch at the site was turned off, and when the "forward" button on the measuring device was pressed, the device retreated due to the gas pressure in the furnace. After pressing the "stop button," the measuring device temporarily stopped, but then when the purge button for the antenna into the furnace was pressed, the measuring device retreated further. Gas from the furnace leaked through the tire seal section of the ball valve that was stopping the gas leak, causing many people nearby and those watching the test from a distance to be exposed to the furnace gas and suffer from carbon monoxide poisoning. [Proposal] ■ Workers should wear portable gas monitors while working. ■ This will enable early detection of gas leaks from the furnace and alert workers and those nearby to the danger. *For more details, please refer to the PDF document or feel free to contact us.

• Measurement and Inspection

During the cleaning of the lower section of the desulfurization unit, the victim and two colleagues were using a vacuum hose to perform suction work outside the inner manhole, while four others were inside the inner manhole. The observer at the steel mill sensed an unpleasant odor and, concerned about the inflow of exhaust gas from the sintering machine, measured the levels of sulfur dioxide, oxygen concentration, and carbon monoxide concentration inside the manhole. The oxygen concentration was 18.8% and the carbon monoxide concentration was 130 ppm, prompting the observer to instruct the workers inside the manhole to "run away." After receiving medical attention, both the observer and the victim were advised to be hospitalized; however, the observer returned home the same day, while the victim was hospitalized for a week due to carbon monoxide poisoning. [Suggestions] - Workers should wear portable gas monitors while working. - This will enable early detection of gas leaks in the furnace and alert workers and those nearby to potential dangers. *For more details, please refer to the PDF document or feel free to contact us.*

• Measurement and Inspection

During regular maintenance, the internal painting of the draft was carried out, but due to areas left unpainted and poor painting quality, the workers entered the draft to perform finishing touches. One of the two workers inside the draft sat down, and the other became unable to move, so they were taken to the hospital. Following examinations, both were diagnosed with poisoning from organic solvents. [Suggestions] - Use gas detectors to confirm the effectiveness of ventilation. - Work while ensuring safety with a portable gas monitor. *For more details, please refer to the PDF document or feel free to contact us.*

• Measurement and Inspection

Three workers were engaged in the replacement of the backflow prevention valve for the water supply pipe installed in the pump well. While using a submersible pump powered by a gasoline engine to draw water, exhaust gases accumulated in the pump well, causing the three workers to report feeling unwell and lose consciousness. Two victims who remained in the pump well were rescued by staff from the water purification plant. One individual managed to escape on their own and all three were transported to the hospital, where they were hospitalized for 11 days. 【Suggestions】 - Use gas detectors to confirm the effectiveness of ventilation. - Work while ensuring safety with a portable gas monitor. *For more details, please refer to the PDF document or feel free to contact us.*

• Measurement and Inspection

The victim began work around 3:30 PM on the day of the incident, entering the washing tank to remove paint sludge. They went down to the bottom of the tank to gather the sediment and discharge it outside the tank, but around 4:10 PM, after discharging the sediment three times, they were affected. At the time of discovery, the victim was found collapsed in a crouched position at the bottom of the washing tank and was unconscious. They were transported to the hospital by ambulance, received treatment, and regained consciousness approximately 2 hours and 10 minutes after the incident. [Suggestions] - Workers should wear personal PID monitors while working. - This will allow for the confirmation of exposure conditions and assist in the risk assessment of chemicals. *For more details, please refer to the PDF document or feel free to contact us.*

• Measurement and Inspection

During the post-processing stage of producing the adsorbent, after removing bromine cyanide from the water, sodium hypochlorite was added for treatment, resulting in the generation of hydrogen cyanide due to a chemical reaction. Since no exposure prevention measures were taken, the worker was exposed to hydrogen cyanide. About 30 minutes after finishing the work, the worker felt nauseous and went to the hospital, where they were diagnosed with cyanide poisoning and admitted. 【Suggestion】 ■ In addition to risk reduction measures, it is recommended to work while ensuring safety with a gas detection alarm. *For more details, please refer to the PDF document or feel free to contact us.

• Measurement and Inspection

While a basket was rotating in the washing tank of the cleaning device, it came loose, causing the products being cleaned to scatter inside the tank. A worker entered the cleaning device to pick up the scattered products. However, since they entered while there was still about half of the cleaning solution remaining, they inhaled the vapor of dichloromethane contained in the cleaning solution and were exposed. The worker lost consciousness after inhaling the vapor and was found in a state caught on a hanger inside the cleaning device by the cleaning operator, who rescued them. They were diagnosed with dichloromethane poisoning by a doctor and took 15 days off work. 【Suggestions】 ■ Measuring gas concentration is effective for confirming adequate ventilation. ■ Using a personal PID monitor for chemical risk assessment is recommended. *For more details, please refer to the PDF document or feel free to contact us.

• Measurement and Inspection

While the operator was discharging sludge in the circulating water receiving tank, they inhaled hydrogen sulfide generated from the sludge, suddenly lost consciousness, and collapsed. A worker who entered the tank to rescue them also lost consciousness and collapsed. Workers equipped with oxygen tanks and respirators rushed in, entered the tank, and rescued the two individuals. When measuring the hydrogen sulfide concentration at the location measured before the work, it was found to be over 100 ppm. 【Suggestions】 ■ Use gas detectors to confirm the effectiveness of ventilation ■ Work while confirming safety with portable gas monitors *For more details, please refer to the PDF document or feel free to contact us.

• Measurement and Inspection

We will introduce a case of drying work involving a pharmaceutical intermediate containing a large amount of acetone as a solvent at a pharmaceutical manufacturing plant. In the production of drugs, after the filtration process, workers moved the intermediate to the drying room, transferred it to trays, and placed the trays on the shelves of a low-temperature dryer, during which they were exposed to high concentrations of acetone. After finishing work in the drying room, two workers reported feeling unwell and were taken to the hospital, where they were diagnosed with organic solvent poisoning and received inpatient treatment. 【Suggestions】 - Workers should wear personal PID monitors while working. - This will allow for monitoring exposure levels and assist in chemical risk assessments. *For more details, please refer to the PDF document or feel free to contact us.*

• Measurement and Inspection

During the extraction of coffee concentrate by pouring hot water into an extraction container filled with roasted coffee beans, carbon monoxide that had been adsorbed onto the roasted coffee beans was suddenly released and accumulated in the sealed extraction container. A stick used to level the coffee beans that had fallen into the container was attempted to be retrieved after extraction, resulting in an accident. The victim was affected while discharging the remaining coffee grounds and fell inside the container. By the time they were rescued from the extraction container, they were already unconscious, and a subsequent hospital diagnosis revealed carbon monoxide poisoning, leading to their death about a month later. **Suggestion** - To prevent carbon monoxide poisoning during work, such as leaks from the extraction container, the use of portable carbon monoxide monitors is recommended. *For more details, please refer to the PDF document or feel free to contact us.*

• Measurement and Inspection

This is a case from a workspace with a gas oven in a Japanese and Western confectionery manufacturing factory. A gas oven was used without a duct to discharge combustion gases (LP gas) after combustion, and the exhaust fan was not turned on. The windows and entrances were kept closed except during entry and exit, leading to exposure to carbon monoxide generated by the gas oven during work. The worker complained of symptoms such as headaches and nausea, and upon rushing to the hospital, it was determined to be carbon monoxide poisoning. The worker with severe symptoms took a day off. 【Suggestion】 ■ It is recommended to measure the gas concentration in the work environment to check for the presence or accumulation of gas. *For more details, please refer to the PDF document or feel free to contact us.

• Measurement and Inspection

After transferring the crystals generated in the reaction vessel to a centrifuge and filtering them, we washed them with acetonitrile. However, due to insufficient washing, we switched to a kneading wash method that involved inserting hands into the centrifuge. We removed the duct of the local exhaust system of the centrifuge, which was obstructing the work, and while performing the task, we inhaled acetonitrile vapors, leading to exposure. The next day, four workers engaged in the kneading wash of the crystals reported feeling weak and went to the hospital for examination, where they were diagnosed with acetonitrile poisoning. [Suggestions] - Workers should wear personal PID monitors while working. - This will allow for monitoring exposure conditions and assist in the risk assessment of chemicals. *For more details, please refer to the PDF document or feel free to contact us.*

• Measurement and Inspection