岡崎製作所 List of Products and Services

The "Ultra-Fine Sheath Thermocouple" has a sheath outer diameter of φ0.08mm and a response time of less than 1ms. It accurately captures temperature in situations where high-speed temperature measurement is desired, such as with small measurement objects or in narrow measurement locations. 【Features】 　■ Sheath outer diameter of φ0.08mm 　■ Response time of less than 1ms 　■ Accurately captures temperature in narrow measurement locations 　■ Heat shrink tubing has a sheath outer diameter of less than φ0.25 *For more details, please refer to the PDF document or feel free to contact us.

Lithium-ion batteries used in electric vehicles and hybrid vehicles have a high energy density and may pose a risk of abnormal heating during short circuits, potentially leading to explosions or fires. Therefore, manufacturers conduct evaluations through forced internal short circuit tests to ensure safety. The "Nail-type Sheath Thermocouple" plays a crucial role in this evaluation by inserting a sheath inside the nail to measure the temperature at the short circuit point, serving as an important safety test. 【Delivery Example】 ■ Type of Thermocouple: K ■ Outer Diameter of Sheath: φ0.65 ■ Number of Wires: Single Element ■ Temperature Measurement Contact: Non-grounded Type ■ Sheath Material: NCF600 equivalent ■ Class: JIS Class 2 ■ Compensation Wire: Teflon Coated *For more details, please refer to the PDF document or feel free to contact us.

The "MI Cable" is a reliable and economical product produced in-house from materials using our unique technology. It can be bent or coiled, and it is also possible to solder or weld it. The sheath material is made from stainless steel or nickel alloy steel, which offers high heat and corrosion resistance, and can be manufactured to very thin outer diameters according to application needs. 【Features】 ■ Wide temperature range ■ High mechanical strength and pressure resistance ■ Inorganic insulation tailored to applications ■ Long lifespan ■ A variety of sizes and shapes *For more details, please refer to the PDF document or feel free to contact us.

The "Waterproof Connector Equipped Thermocouple GS One-Touch Sensor" is a product developed to meet customer needs for waste incinerators. With the one-touch cable, cable attachment and detachment is easy, significantly reducing work time. By adopting a connector sized to be below the outer diameter of the protective tube, if the protective tube cannot be pulled out of the furnace due to bending or attachments during operation, the sensor can be pulled into the furnace along with the protective tube. 【Features】 ■ Easy wiring work with a waterproof connector system with cable ■ Waterproof grade equivalent to IP67 ■ Adoption of a compact connector allows the protective tube to be pulled into the furnace ■ Easy sensor replacement since there is no need to take it outside the furnace *For more details, please refer to the PDF document or feel free to contact us.

This product has been made narrower than conventional sheath thermocouples, allowing it to be used in tight spaces. It is suitable for use in locations with limited installation space, such as in research and development tests. It does not take up installation space and is not intrusive. Additionally, φ0.5 and φ1.0 can be manufactured. 【Specifications】 ■ Resin Sleeve - Maximum temperature: 80℃ ■ Compensation Wire - Conductor: φ0.2×2 - Insulator: PFA - Sheath: PFA - Outer diameter: approximately 0.9×1.4 ■ M4 Thick Terminal *For more details, please refer to the PDF document or feel free to contact us.

This is a hydrogen-compatible, pressure-resistant explosion-proof temperature sensor that complies with explosion-proof standards in Japan and various countries/regions around the world, as well as IECEx. It has obtained type certification from various testing organizations. With an IP66 and NEMA 4 & 4X rating, it can be safely used in harsh environments. As a result, safety testing by the receiving country is exempted, allowing for smooth sales and distribution. 【Features】 ■ Complies with explosion-proof standards in Japan and various countries/regions, as well as IECEx ■ Numerous delivery records in the hydrogen field with design pressures of 100 to 150 MPa ■ Many delivery records with liquid hydrogen *For more details, please refer to the PDF document or feel free to contact us.

Fluororesin-coated fine-diameter thermocouples are thermocouples insulated with fluororesin on fine-diameter thermocouple wires. There are types with exposed temperature measurement contact points and types insulated with fluororesin or silicone rubber. The minimum outer diameter after fluororesin coating is about 0.1 mm, making it suitable for temperature measurement in extremely narrow spaces. The resin-molded type is airtight and has excellent corrosion resistance. The exposed tip type is suitable for measuring gas temperatures or solid surface temperatures, while the resin-molded type is appropriate for measurements in water or in locations requiring electrical insulation. 【Features】 ■ Technology for welding φ0.025 fine wire (EXS Nano Type) ■ Mold processing using Teflon material ■ Capable of measurements in water or in locations requiring electrical insulation ■ Mold with the same outer diameter as the sheath allows for smooth installation even in narrow spaces *For more details, please refer to the PDF document or feel free to contact us.

The "Sheath Thermocouple for Vacuum Equipment" is designed to be sealed with commercially available vacuum flanges and O-rings, allowing for easy installation and use with vacuum equipment. It can also accommodate He leak tests according to the vacuum level used. With a diverse lineup, options are available that prioritize response speed or can handle temperatures up to 1000°C, allowing for selection based on application needs. 【Features】 ■ Sealed type using commercially available vacuum flanges and O-rings ■ Easy to install and use with vacuum equipment ■ Compatible with He leak tests according to the vacuum level used ■ Diverse lineup ■ Selection available based on application needs *For more details, please refer to the PDF document or feel free to contact us.

The "HOSKINS2300/SC1000H&N" is a sheath thermocouple that can be used in high-temperature environments exceeding 1000°C, which was previously only achievable with expensive platinum-based thermocouples. The use of a special alloy sheath reduces degradation even in environments of 1260°C. It does not oxidize even after 2000 hours of testing at 1000°C, allowing for long-term use. Additionally, it prevents the penetration of external attack substances, preserving the integrity of the element itself and ensuring stable output. 【Features】 ■ Significant cost reduction ■ Excellent durability and stability ■ Long lifespan ■ Reduced degradation in environments of 1250°C due to the special alloy sheath ■ No oxidation even after 2000 hours of testing at 1000°C *For more details, please refer to the PDF document or feel free to contact us.

"OKAZAKI-ARi" is a thermocouple designed for temperature measurement exceeding 2000°C. You can choose the sheath material, element, and insulation material according to your desired application. There are two types available: one is the AEROPAK type with an inorganic insulator filled sheath, and the other is a type that encapsulates an insulating insulator. We offer elements based on platinum-rhodium and tungsten-rhenium, so please select according to the usage temperature and atmosphere. 【Features】 ■ Usable for temperature measurement exceeding 2000°C ■ Customizable sheath material, element, and insulation material according to your desired application ■ Elements selected based on usage temperature and atmosphere *For more details, please refer to the PDF document or feel free to contact us.

Thermocouples may experience a decrease in insulation resistance during use on-site due to factors such as the influence of the installation location, the aging of insulation materials, and moisture intrusion during manufacturing. While there are many cases where they can be used without issues, what is the actual extent of the impact in such cases? Additionally, to what degree of insulation resistance reduction can be tolerated? A: When simply evaluating the integrity of a thermocouple, it is common to use the presence of continuity and high insulation resistance as benchmarks. For product shipments, the specifications for thermal electromotive force characteristics and insulation resistance are outlined in JIS C1602/1605 as part of the handover inspection. The current JIS has been aligned with IEC standards, so the specified insulation resistance value at the time of shipment is set quite high at 100MΩ / 500VDC. Previously, when Japan had its own unique standards, it was 5MΩ / 500VDC. There is no performance-based rationale for this change; it was simply an alignment of values with the IEC standards, and there is no clear justification for requiring insulation resistance to be this high. However, in most cases, the performance is judged solely based on this figure. *For more details, please refer to the PDF document or feel free to contact us.

The color code for thermocouples and compensation wires varies significantly by country’s standards, which can lead to mistakes in polarity during wiring work. What is the temperature indication in such cases? A: The connection point between the thermocouple and the compensation wire is often at the terminal box or junction box that comes with the thermocouple, and this connection point is frequently at ambient temperature. Therefore, if the connection from the terminal box to the receiving instrument's terminal is made with the polarity reversed, the temperature difference between the terminal box and the receiving instrument's terminal will affect the error. If there is no temperature difference between the two, there will be no error; however, in summer or winter, the temperature difference can become very large, potentially resulting in an error of over 10°C. As an extreme example, if the terminal box reaches 40°C in summer and the receiving instrument is at 20°C, for a type E thermocouple, if the polarity is correct, it would generate a thermoelectric voltage of 2420μV at 40°C and 1192μV at 20°C, resulting in a difference of 1228μV. *For more details, please refer to the PDF document or feel free to contact us.*

Depending on the installation environment of the thermocouple, the connection part (sleeve or terminal box) may become high in temperature. What are the effects? A: The negative effects due to the temperature rise of the sleeve are expected to be the following two: (1) When the measurement temperature is close to the sleeve temperature, the performance of the compensation wire will be more prominently outputted rather than the performance of the sheath thermocouple. (2) Exceeding the heat resistance temperature of the epoxy resin inside the sleeve may lead to disconnection or a decrease in insulation. *For more details, please refer to the related links for explanations about these phenomena and the effects of epoxy resin. We encourage you to read them. *For more information, please refer to the PDF materials or feel free to contact us.

In general instrumentation processes, thermocouple terminals are often gathered in a junction box and connected to compensation wires using a general-purpose terminal block. This results in dissimilar metal connections, but what is the error associated with this? A: In typical measurement methods, temperature is measured using thermocouples to reduce costs, and the measurement is extended to a distant instrument using compensation wires. Even with inexpensive base metal thermocouples (K, E, J, T), there is a price difference when comparing thermocouple wires and compensation wires, which is why compensation wires are used. At that time, the thermocouple and compensation wires are connected in a terminal box, often using commercially available standard terminal boards. Compensation wires have thermal electromotive force characteristics almost equivalent to those of thermocouples, but the metal plates used in terminal boards are mostly copper alloys, with both the positive and negative sides being of the same metal type. As a result, dissimilar metals may coexist in the thermocouple circuit, raising concerns about the occurrence of errors. *For more details, please refer to the PDF document or feel free to contact us.*

In power plants and large chemical plants, the distance from the temperature measurement point to the instrument room can be several kilometers. What are the issues in such cases? A: Due to the principle of thermocouples, the thermoelectric voltage generated is determined solely by the thermocouple materials used and the temperatures at both ends, and the characteristics do not change based on the diameter or length of the thermocouple wire. Therefore, it does not matter if the measuring part is thin and the middle part is thick, and there are no issues with measurement accuracy even with thin film thermocouples. However, there are constraints on the instrument side that measures the thermoelectric voltage, specifically a limitation on the input resistance to the instrument, which must be within a certain number of ohms. For this reason, in large-scale plants such as power stations, the diameter of the compensation wire is increased to facilitate long-distance transmission. For a certain manufacturer's temperature controller, the allowable signal source resistance for the thermocouple is set at 100 ohms or less, while the allowable wiring resistance for temperature measuring resistance elements is set at 10 ohms or less per wire. *For more details, please refer to the PDF document or feel free to contact us.*

When a K thermocouple is used for a certain period in the temperature range of 250°C to 550°C and then subjected to temperature inspection and calibration, there may be a significant error on the positive side. What is the cause and countermeasure for this? A: When a K thermocouple is exposed to a temperature range of approximately 250°C to 550°C, the thermoelectric power of the exposed part gradually increases, resulting in a phenomenon where it indicates a temperature several degrees higher than the actual temperature by changing the insertion length. This effect recovers to its original state when the temperature exceeds about 650°C. This temperature range may vary slightly according to the literature. It becomes particularly evident when the actual insertion depth differs from the insertion depth during calibration. If the insertion length is not changed to a shorter length, significant changes will not occur. *For more details, please refer to the PDF document or feel free to contact us.*

"SUPER COUPLE 1000M" is a high corrosion-resistant sheath thermocouple and protection tube that uses a high corrosion-resistant nickel-based alloy from Okazaki Seisakusho's extensive sheath materials. By adopting a special sheath, it reduces deterioration and achieves a long lifespan. Additionally, with a heat resistance temperature of 800°C, it can be used even in high-temperature corrosive environments. Please feel free to contact us when you need assistance. 【Features】 ■ Superior corrosion resistance compared to Hastelloy X ■ Heat resistance temperature: 800°C ■ Custom protective tubes for thermometers can also be manufactured *For more details, please refer to the PDF document or feel free to contact us.

Okazaki Manufacturing Co., Ltd. will be exhibiting at the "2024 NAGOYA Automotive Technology Exhibition" held at Aichi Sky Expo (Aichi Prefectural International Exhibition Center). We plan to showcase products including the world's smallest diameter class φ0.08mm ultra-fine sheath thermocouples, temperature measuring resistors capable of high-precision measurement even at -269℃, compact surface temperature sensors, sensors that can withstand ultra-high pressures of over 100MPa, and micro heaters. We would be delighted if you could visit our booth when you come to the exhibition. We sincerely look forward to your attendance. 【Exhibition Overview】 ■ Dates: July 17 (Wednesday) to July 19 (Friday), 2024 ■ Hours: 10:00 AM to 5:00 PM (ending time is 5:00 PM on all three days) ■ Admission Fee: Free *For more details, please refer to the PDF document or feel free to contact us.

Okazaki Manufacturing Co., Ltd. will exhibit at the "Measurement Expo 2024 OSAKA" held at the Grand Cube Osaka (Osaka Prefectural International Conference Hall). We plan to showcase products including the world's smallest diameter class φ0.08mm ultra-fine sheath thermocouples, temperature measuring resistors capable of high-precision measurement even at -269℃, compact surface temperature sensors, and sensors that can withstand ultra-high pressures of over 100MPa. We would be delighted if you could visit our booth when you attend the exhibition. We sincerely look forward to your visit. 【Exhibition Overview】 ■ Dates: October 30 (Wed) - November 1 (Fri), 2024 ■ Hours: 10:00 AM - 5:00 PM ■ Admission: Free *For more details, please refer to the PDF document or feel free to contact us.

- This is a sanitary specification temperature sensor designed to meet the strict hygiene management required in the manufacturing sites of food, pharmaceuticals, and cosmetics. - It can maintain a state of cleanliness free from foreign substances and microorganisms. - It is compatible with bead finish, buff polished finish, and electropolished finish.

It has become possible to manufacture thermometer protection tubes made of TZM alloy (titanium-zirconium-molybdenum alloy) used in the aerospace industry and in reactors. This increases the options available for high-temperature corrosive environments, where ceramic-based thermometer protection tubes were previously the main choice. It also accommodates machining processes such as threading that could not be achieved with ceramic-based protection tubes.