OSK Turns 40 and Refreshes Its Website
OSK marks its 40th anniversary with a refreshed website and a look back at its early workshop.
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Product literature and website updates from Changzhou OSK.
What Dimensions Should You Specify When Fitting a Slender MI Thermocouple into a Sleeve?
A probe can meet its specified diameter and overall length and still fail to reach the intended sensing point inside a sleeve. The drawing should show the path the probe must pass through.
Fit. Specify the sheath outside diameter and tolerance, the sleeve’s minimum inside diameter and the entry dimensions. Mark any steps or reductions along the bore.
Insertion length. Identify the datum for measuring to the probe tip, such as the face of a threaded mount or the sealing face of a flange. Show where the tip should sit after assembly.
Straightness. Mark the length to be checked and specify the allowable deviation and inspection method. An existing sleeve, mating part or assembly drawing can help confirm the fit before sampling.
Include these dimensions with the thermocouple type, operating temperature and wiring requirements.
MI thermocouple quote guide · OSK thermocouple straightening fixture
OSK Thermocouple Used in a Renal Denervation (RDN) Procedure
A thermocouple supplied by OSK was used in a clinical renal denervation (RDN) procedure as a component of a device supplied by a project partner. This marks a milestone for OSK in supplying temperature-sensing components for medical devices.
Read more →OSK Joins Jiangsu Research Project on Thermocouple Performance and Processing Equipment
The Jiangsu Provincial Department of Science and Technology listed the thermocouple performance and processing equipment project under its 2024 industry–academia research programme in notice No. 114 (2025). Jiangsu University of Technology leads project BY20240376, with OSK as the industry partner.
The project plans to examine how thermoelectric materials and component geometry affect thermocouple performance, and to use numerical simulation to evaluate design changes. The planned work includes defining simulation software modules and designing processing equipment, with the aim of improving manufacturing efficiency and product quality.
The project brings performance analysis and equipment design into the same research programme. Its planned outputs include simulation software, a processing equipment design and patent applications. Project outcomes are subject to formal acceptance.
View the provincial project notice and list (Chinese) · Explore OSK MI thermocouples
How Is an MI Thermocouple Straightened? A Look at OSK’s Straightening Fixture
OSK’s Chinese utility model for a thermocouple straightening fixture was announced as granted on September 16, 2022, under publication number CN217432880U.
When a straight MI probe must pass through a guide hole or fit into a sleeve, probe diameter, straightness and installation clearance all affect the fit. Straightening corrects bends in the workpiece. The finished probe should be checked against the length, measurement method and tolerance specified on the drawing.
For a long, slender probe, mark the sheath diameter, insertion length and mating bore dimensions on the drawing. Identify the section that needs straightness control and agree on how it will be measured and accepted.
View the public patent citation record (CN217432880U) · Explore OSK MI thermocouples
What Should You Specify When Requesting a Quote for MI Thermocouples?
Provide the following details so the supplier can review the configuration and prepare a quote. If a drawing is available, include its number, revision and critical dimensions.
- Thermocouple type, tolerance class and number of circuits. Specify the type (for example K, N, J, T or E), required tolerance class and applicable temperature range, and whether the probe is simplex, duplex or triplex. IEC 60584-1:2013 specifies reference functions and tolerances. Overall measurement accuracy also depends on the instrument, wiring and installation.
- Operating temperatures and process conditions. State the normal operating temperature, short-term peak and its duration. Identify the medium, atmosphere and any relevant pressure, flow or vibration. Confirm sheath material and dimensions for the application. Check the reference-table range and the operating limit of the finished assembly separately.
- Probe dimensions and mounting. Specify sheath outside diameter, insertion length and its measurement datum, critical dimensional tolerances and the mounting connection, such as a thread, flange or compression fitting. Include an installation drawing and acceptance criteria where bending, sealing or pressure retention is required.
- Measuring junction and termination. Specify a grounded, ungrounded or exposed junction, together with any response-time and electrical isolation requirements. Identify the termination, such as a connection head, plug or leads. If extension or compensating cable is required, specify the compatible cable designation, length and operating environment.
- Acceptance and delivery. State the quantity, applicable standard and edition, and required documentation. For insulation resistance testing, calibration at specified temperatures or other special inspections, specify the applicable test conditions, acceptance criteria and reporting requirements.
IEC 61515:2016 covers newly supplied mineral-insulated, metal-sheathed thermocouples and cables of types T, J, E, K and N for general industrial applications. It addresses different requirements from the standard for thermocouple reference functions and tolerances.
References IEC 61515:2016 · IEC 60584-1:2013