Yuyao Jiyuan Instrument Co., Ltd. is a manufacturing enterprise founded in 2012, specialising in the research, custom design, production and sales of special-purpose thermocouples for demanding industrial applications.
Our engineering team operates an in-house high-temperature laboratory and maintains long-term cooperation with several universities. Targeting severe service conditions in waste-to-energy plants, coal-fired power plants (CFB boilers), biomass power plants, steel mills, cement plants and carbon plants, we continuously test and develop protection-tube materials in close cooperation with site engineers.
Through years of development we have engineered a range of high-performance wear-resistant, corrosion-resistant and ultra-high-temperature thermocouples that overcome the short service life typical of conventional thermocouples in these positions. In particular we have achieved significant technical breakthroughs in the waste-to-energy furnace chamber and hold several patents covering furnace thermocouples, ultra-high-temperature thermocouples and wear/corrosion-resistant thermocouples.
Beyond thermocouples we also manufacture RTDs (Pt100), bimetallic thermometers, pressure gauges and a range of temperature transmitters — offering complete measurement solutions rather than a single product line.
| Certificate / report | Scope | Validity / basis |
|---|---|---|
| ISO 9001:2015 Quality Management System |
Design & manufacture of thermocouples, RTDs and stainless steel pressure gauges; sales of instruments | Valid until 2029-07-08 |
| ISO 14001:2015 Environmental Management System |
Same scope as above | Valid until 2029-07-08 |
| ISO 45001:2018 Occupational Health & Safety |
Same scope as above | Valid until 2029-07-08 |
| Product type-test reports Sheathed thermocouples |
Type WRNK series sheathed thermocouples | Tested to GB/T 18404-2022 (equivalent to IEC 61515); tolerance basis GB/T 16839 (equivalent to IEC 60584-1). English version available on request. |
| Measurement standards certificate Sheathed thermocouple calibration facility |
Calibration of sheathed thermocouples, 300–1100 °C | Issued under China Metrology Law; valid until 2028-03-28 |
| Measurement standards certificate Secondary standard Pt resistance thermometer |
Calibration of industrial Pt100 / Cu resistance thermometers, −80 to +300 °C | Valid until 2028-03-28 |
| Patents (utility model, multiple) | Furnace-dedicated thermocouple; ultra-high-temperature thermocouple; wear- and corrosion-resistant thermocouple | Granted |
| After-sales service certification | After-sales service capability, instruments & meters | Valid |
Each of these is a real, in-production protection-tube or sealing technology — tested on site until its service life was proven. We name them so you can specify them.
Protection-tube material and probe design are matched to your furnace type, fuel, flue-gas chemistry and installation point — then tested until the service life is proven on site.
For furnace sensors we quote expected service life by tube diameter and position, so you can budget replacement intervals instead of reacting to failures.
In-house metrology laboratory covering thermocouple and Pt100 calibration, product type-test reports, and a full quality / environment / occupational health & safety management system.
Insertion length, diameter, thread or flange, cable length, termination and accuracy class are all made to order. Nothing is held as a shelf item.