High temperature, chlorine-bearing flue gas and high-speed fly-ash erosion attack at the same time. Here is how we stop it — five protection-tube designs, each matched to a specific failure mechanism, each with a service life we will quote up front.
A standard sheathed thermocouple is designed for a clean process. In a waste-to-energy furnace chamber it faces all three of these simultaneously — which is why life is measured in weeks, not years.
Every model below is a real production design with its own protection-tube technology. If you are unsure which fits your furnace, send us the furnace type, fuel and installation point — we will recommend, not guess.
For the common case: a probe that is being physically ground away by fly ash and slag.
For furnaces burning high-chlorine waste, where the tube is chemically eaten rather than worn.
For the hottest measurement points — and a direct replacement for brittle ceramic tubes in Type S service.
For the worst combination — where the tube must resist chemical attack and physical abrasion at the same time.
For extreme temperature zones and aggressive chemistry, including where ordinary ceramics would shatter.
A starting point based on the failure mode you are seeing. Final selection is confirmed against your furnace type, fuel and installation point — at no cost.
| What you observe | Recommended model | Why |
|---|---|---|
| Tube wall thinned or worn through; probe physically ground down | WRNB-331HJ | Wear-resistant alloy tube with impact and creep-bending resistance |
| Tube corroded, pitted or scaling; high-chlorine waste feed | WRNB-332HJ | Anti-chlorine alloy, 6× the corrosion resistance of ordinary alloys |
| Ceramic tube cracking or shattering; Type S measurement points | WRNB-333HJ | Ductile high-temperature alloy to 1400 °C replacing brittle alumina |
| Both corrosion and erosion present; previously tried wear alloys without success | WRNB-335HJ | Overlay-welded (hardfaced) surface — fine grain, uniform thickness |
| Extreme temperature zone; thermal cycling breaks conventional ceramics | WRNB-336HC | Composite ceramic to 1600 °C, dense and low-porosity, resists bursting |
We quote expected life by tube diameter and installation position, so replacement intervals can be planned instead of discovered.
| Series | Typical service life | Why it matters on site |
|---|---|---|
| Power plant / CFB boiler WRNK-JYHD |
6–24 months (by tube diameter) | Reducing replacements from ten a year to two removes eight access and outage events — plus eight high-altitude or confined-space jobs. |
| Steel hot blast stove WRNK-JYGT |
3–12 months (by tube diameter) | Vibration-resistant construction keeps the signal stable where mechanical shock is constant. |
| Cement kiln inlet/outlet WRNK-JYSN |
1 month and above | Vacuum induction melting + remelting gives uniform hot strength in a highly abrasive, high-temperature zone. |
| Carbon baking furnace WRNK-JYTS |
≥ 3 months; 6–12 months when conditions are well controlled | Accurate, uniform temperature is what decides anode quality — drift is a production problem, not just a maintenance one. |
Each 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.
The more you tell us about the installation, the more specific our answer. A drawing, photo or reference model number is welcome. We reply with a matched design and a stated service-life expectation.