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Okazaki Manufacturing Company | Date: 2014-03-04

It is aimed to provide an inexpensive water level sensor capable of improving accuracy. The water level sensor includes a heat generating body 9 operable to generate heat by an electricity, a thermocouple 12 having a temperature measurement point 123 arranged adjacent to the heat generating body 9, a protection tube 13 for housing these heat generating body 9 and thermocouple 12 and an insulating material 14 filled in this protection tube. The heat generating body 9 includes a platinum resistive element 9 as a heat source.

Numajiri H.,Tokyo Institute of Technology | Sasaki M.,Tokyo Institute of Technology | Aikawa T.,Chino Corporation | Sato H.,Japan Electrical Meters Inspection Corporation | And 4 more authors.
Electronics and Communications in Japan | Year: 2014

SUMMARY Using a small-size crucible, interlaboratory comparison of the realization of the Co-C eutectic point was performed in the industrial field in Japan, with the aim of verifying the possibility of thermocouple calibration at the eutectic point with an existing furnace of less-than-ideal temperature distribution, namely, the palladium-point wire-bridge method furnace for thermocouple calibration. A small-size crucible for thermocouples was made by the National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology (NMIJ/AIST). The interlaboratory comparison was piloted by the Tokyo Metropolitan Industrial Technology Research Institute (TIRI), a public test and research organization in Tokyo, and was conducted among five calibration laboratories including the pilot. One of the five laboratories is a designated calibration laboratory in Japan, and the other three are private laboratories. Four laboratories including TIRI used an existing palladium-point furnace, and one laboratory made a new furnace for this interlaboratory comparison. © 2014 Wiley Periodicals, Inc.

Yasutomi T.,Electric Power Development Co. | Takahashi M.,Japan Metals and Chemicals Co. | Saijyo T.,Okazaki Manufacturing Company
Zairyo to Kankyo/ Corrosion Engineering | Year: 2015

The purpose of this study is to improve the life of sensors used to monitor the internal temperature of a coal gasification furnace, which has a strong reducing atmosphere. This paper reports the results of a comparison study of corrosion between protection tubes made from chromium, known for corrosion resistance, and iridium, commonly used in this application. It was confirmed during this study that the pure chromium tube had a life at least 2.5 times longer than that of a pure iridium tube.

Okazaki Manufacturing Company and Electric Power Development Co. | Date: 2012-03-02

The present invention relates to an in-furnace temperature measurement device 1 for a furnace in which gas is generated. The measurement device 1 includes: a support tube 3 which communicates with a measurement hole 2A which leads to an inside of the furnace; a sensor protection tube 4 inserted into the support tube 3 so as to be movable in an axial direction with a leading end, of the sensor protection tube 4, facing a furnace side; a plurality of seal rings 6A and 6B which hermetically seal a gap between the support tube 3 and the sensor protection tube 4 and which are arranged at an interval so as to divide the gap into a plurality of space portions in the axial direction; a temperature sensor 5 housed in the sensor protection tube 4 such that a temperature-sensing portion of the temperature sensor 5 corresponds to a leading-end portion of the sensor protection tube 4; and a drive mechanism 7 which drives the leading-end portion of the sensor protection tube 4 so as to be able to advance and retract in the axial direction with respect to the inside of the furnace through the measurement hole 2A, while maintaining a sealed state by the seal rings 6A and 6B.

Okazaki Manufacturing Company | Date: 2014-04-22

A terminal head, which is provided in a sheath type temperature sensor and is for connecting the sheath type temperature sensor and a cable, is structured such that, in order for replacement of the sheath type temperature sensor to be easily performed and in order to minimize the number of replacement parts, a terminal plate (2) of the terminal head (1) and the sheath type temperature sensor 3 are coupled using a pair of plug-in connectors (4, 5) and the coupling is held by a coupling nut (6). When replacing the sheath type temperature sensor (3), the leads (31) of the sheath type temperature sensor do not need to be detached from and attached to the terminal plate (2) at the replacement worksite, and the only replaced part other than the sheath type temperature sensor (3) is the one connector (5).

The materials used for a termination sleeve-equipped MI cable according to the present invention, including bonded portions formed with silver solder, are all non-magnetic substances, and therefore, there will be no disturbance of an external magnetic field due to the presence of a magnetic substance. Furthermore, a pair or a plurality of pairs of conducting wires of the MI cable that transmit a signal or electric power are each formed in a double helix configuration, and therefore the generation of a magnetic field due to the currents flowing through the conducting wires and the influence from an external magnetic field on a signal or electric power to be transmitted can be minimized by using the two conducting wires of each pair as a single round-trip signal line or as a single round-trip electric power line.

Okazaki Manufacturing Company | Date: 2012-10-19

Provided is a cryogenic temperature measuring resistor element including a metallic temperature measuring resistor wire, an electric insulator made of a polycrystalline ceramic material, and a filler filled between the electric insulator and the temperature measuring resistor wire. The filler includes polycrystalline inorganic electric insulating powder, particles of the insulating powder being connected by glass. The glass has a lower softening point than respective melting points of the inorganic electric insulating powder, the temperature measuring resistor wire, and the electric insulator.

Okazaki Manufacturing Company | Date: 2014-01-21

In order to solve a technical problem of a temperature sensor for high temperature, in which platinum lead wires may be broken when used at a high temperature, an inner frame (8) made of ceramic is provided inside an outer frame (7) made of metal, the inner frame (8) is fixed, only at the upper end portion thereof, to the outer frame (7), and an insulating filler (9) made of a ceramic adhesive or a ceramic powder tightly filled at a high density is filled inside the inner frame (8) and a portion inside the outer frame (7) where the inner frame (8) is not present. According to this configuration, the occurrence of a break in platinum lead wires (6) can be significantly lowered compared with that of conventional examples.

Okazaki Manufacturing Company | Date: 2013-11-28

Thermocouples and parts and fittings therefor; temperature sensors.

Okazaki Manufacturing Company | Date: 2011-03-29

Industrial machinery component part, namely, heaters for vacuum deposition equipment.

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