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Okazaki Explosion/Flame Proof Nipple Type Temperature Sensors
Updated: Sep 15
Nichiboku's industrial Insights
Introduction
Okazaki Explosion/Flame Proof Nipple Type Temperature Sensors are designed for industrial temperature measurement assemblies that require an appropriate hazardous-area configuration.
The product family includes sheathed thermocouples and sheathed resistance thermometer sensors with nipple, union, support-pipe and spring-type constructions. Selection requires the complete model code, sensing-element specification, dimensions, connection and applicable approval requirements.
Confirmed Product Range
The following information is confirmed by Okazaki Manufacturing Company for this product family.
Product Type | Basic Type | Confirmed Construction |
Sheathed Thermocouple | T39N | With nipple |
Sheathed Thermocouple | T39U | With nipple and union |
Sheathed Thermocouple | T39S | With support pipe |
Spring-Type Sheathed Thermocouple | T49N | With nipple |
Spring-Type Sheathed Thermocouple | T49U | With nipple and union |
Spring-Type Sheathed Thermocouple | T49S | With support pipe |
Sheathed Resistance Thermometer Sensor | R39N | With nipple |
Sheathed Resistance Thermometer Sensor | R39U | With nipple and union |
Sheathed Resistance Thermometer Sensor | R39S | With support pipe |
Spring-Type Resistance Thermometer Sensor | R49N | With nipple |
Spring-Type Resistance Thermometer Sensor | R49U | With nipple and union |
Spring-Type Resistance Thermometer Sensor | R49S | With support pipe |
Confirmed Technical Options: Okazaki Explosion/Flame Proof Nipple Type Temperature Sensors
Parameter | Manufacturer Information |
Thermocouple Elements | N, K, E, J and T |
Thermocouple Configuration | Single or double element |
Measuring Junction | Grounded, ungrounded or non-ground/separation type, depending on configuration |
Thermocouple Sheath Materials | 316SS, 310S SS or NCF600 equivalent |
Resistance Elements | Pt100 or JPt100 |
RTD Configuration | Single or double element |
RTD Temperature Range Code L | −196 to 100°C |
RTD Temperature Range Code N | −30 to 200°C |
RTD Temperature Range Code M | 0 to 350°C |
RTD Temperature Range Code H | 0 to 500°C |
Certification Categories Listed | IECEx, ATEX, NEPSI, TR CU, PESO and FM |
Official Product Catalog | OMC-7013 |
These values represent available manufacturer options. They do not describe one universal sensor configuration.
Whole length, insertion length, sheath diameter, nipple length, thread, element class and certification suffix must be selected or confirmed for each requirement.
Explosion/Flame Proof Configuration Boundary
Hazardous-area suitability cannot be determined only from the T39, T49, R39 or R49 basic type.
The complete assembly must be reviewed together with the temperature transmitter or terminal box. Okazaki specifies that the certification authority applicable to the sensor must correspond with that of the combined transmitter or terminal box.
The connection thread of the combined equipment must also be specified. Regional restrictions can apply to particular thread and approval combinations.
The manufacturer additionally notes that the configurations described on the reviewed page cannot be used in hazardous locations requiring Japanese explosion-proof certification. Suitability for a specific country, hazardous area and installation standard requires current manufacturer confirmation.
Model Code Identification and Virtual Catalogues
Nichiboku’s technical application provides structured access to the official Okazaki catalogues:
Book 01: Thermocouples
Book 02: RTD Sensors
Book 03: Heaters
Book 04: Compensating Cables
Book 05: Thermowells
For the sensors covered in this insight, use Book 01 for thermocouples or Book 02 for resistance thermometer sensors.
The application supports model-code identification and RFQ preparation. Generated results are indicative and require final technical confirmation before ordering.
Technical Information Required for Quotation
Required Information | Preferred Technical Evidence |
Manufacturer | Complete and readable nameplate |
Complete Model Code | Exact code with all characters and suffixes |
Sensor Type | Thermocouple or resistance thermometer sensor |
Element Specification | Thermocouple type and junction, or RTD resistance value, wiring and accuracy class |
Construction | Nipple, nipple with union, support pipe or spring type |
Number of Elements | Single or double |
Dimensions | Whole length, insertion length, sheath diameter and nipple length |
Materials | Sheath and other process-contact materials |
Connections | Process connection and transmitter or terminal-box mating thread |
Operating Conditions | Fluid, normal and maximum temperature, pressure and ambient temperature |
Hazardous-Area Requirement | Country, approval system, zone or division, gas/dust group and temperature class |
Combined Equipment | Transmitter or terminal-box manufacturer, model and approval |
Existing Documentation | Original drawing, datasheet, previous purchase record and nameplate photographs |
Commercial Information | Quantity, destination, quotation deadline and direct requirement or tender |
Drawings, technical specifications and nameplate photographs should be submitted through the Nichiboku RFQ form:
Service Life
A fixed service life for every sensor configuration is not stated in the reviewed manufacturer information.
Actual condition should be evaluated according to process exposure, temperature cycles, vibration, calibration history, measurement drift, insulation condition and visible sheath deterioration.
International Sourcing from Japan
Nichiboku supports technical-document coordination, model identification, manufacturer quotation management, export documentation and international supply from Japan.
Quotation and supply feasibility remain subject to confirmation of the complete model, operating conditions, hazardous-area requirements and current manufacturer availability.
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