The Tecnocontrol TS236 / TS237 zirconia oxygen sensor is an in-situ flue-gas oxygen probe mounted directly on the stacks of boilers, burners and dryers, made in Italy by Tecnocontrol. Its zirconium oxide (ZrO₂) cell operates up to 700 °C, measures 0.0–25.0 % O₂ with 4–20 mA output and 0.1 % resolution, powered from 230 VAC. TS236 is for flue gas up to 300 °C, TS237 up to 600 °C.
Unlike electrochemical cells (which cannot contact combustion gas directly and need extractive sampling), the TS236 zirconia probe sits directly in the gas stream, self-calibrates and needs no sampling system – faster, more accurate, less maintenance and easier installation. Equipment Industrial Solution Co., Ltd (ISE) supplies, installs and integrates TS236/TS237 sensors into boiler combustion control.
Advantages of a zirconia oxygen sensor vs electrochemical
- In-situ measurement in the flue gas – no pump, sample lines, filters or sample cooler.
- Self-calibrating – less maintenance, no frequent calibration gas.
- Fast response for O₂ trim (air-fuel ratio) control.
- Long life: no consumable electrochemical element.
- Die-cast aluminium housing, stainless probe with threaded stack fitting.
Tecnocontrol TS236 / TS237 specifications
| Parameter | Value |
|---|---|
| Measuring principle | Zirconium oxide (ZrO₂) probe, cell temperature up to 700 °C |
| Flue-gas temperature | TS236: up to 300 °C; TS237: up to 600 °C |
| Range / output | 0.0–25.0 % O₂ = 4–20 mA |
| O₂ resolution | 0.1 % |
| Power supply | 230 VAC, 50–60 Hz (+10 % / −15 %) |
| Power consumption | Max. 50 VA at 230 VAC |
| Operating temperature / humidity (electronics) | +5…+45 °C / 15–95 % RH |
| Housing dimensions (H × L × W) | 106 × 156 × 81 mm |
| Materials | Die-cast aluminium housing, stainless probe, threaded stack fitting |
| Standards | EN ISO/IEC 17025; Italian Legislative Decree 152/2006; QAL1 (TÜV) certification in progress |
Accessory: TS345 flue-gas temperature probe
Tecnocontrol also supplies the TS345 Pt100 flue-gas temperature probe with 4–20 mA output, so combustion efficiency can be calculated from flue-gas temperature and oxygen.
| Parameter | Value |
|---|---|
| Sensor | Pt100 RTD |
| Range | 0…+400 °C or 0…+800 °C |
| Resolution | 1 °C |
| Output | 4–20 mA |
| Construction | Stainless probe, DIN/B cast head, threaded stack fitting |
| Dimensions (L × W) | 490 × 65 mm |
See also: CST-RTD320 Pt100 sensor and CST-TCS320 thermocouple.
Boiler oxygen monitoring and control with zirconia sensors
The 4–20 mA oxygen signal goes to the PLC or burner controller to adjust the combustion-air fan VFD or damper and hold excess oxygen at the optimum: too little air causes incomplete combustion, CO and soot; too much air carries heat up the stack and wastes fuel. Combining oxygen and flue-gas temperature measurement saves fuel, reduces emissions and tracks boiler efficiency continuously.
Applications of zirconia oxygen sensors
- Oil, gas, coal, wood and biomass boilers – O₂-based combustion control.
- Thermal oil heaters, industrial burners, kilns and drying systems.
- Emission monitoring to support environmental compliance.
FAQ
TS236 or TS237?
Choose by flue-gas temperature: below 300 °C (after economiser or air preheater) use TS236; up to 600 °C (no heat recovery, close to the furnace) use TS237.
Is a 24 VDC version available?
According to the manufacturer, TS236/TS237 operate on 230 VAC. For 24 VDC, see the SST OXY-IE oxygen sensor.
Related products and solutions
- SST OXY-IE boiler oxygen sensor – 4–20 mA, 0–10 V, RS485, 24 VDC
- Flue gas analyzer CO, NO, NO₂, SO₂, O₂
- Boiler oxygen trim control
- Cement kiln oxygen measurement
Where to buy Tecnocontrol zirconia oxygen sensors?
EQUIPMENT INDUSTRIAL SOLUTION CO., LTD (ISE) – Ho Chi Minh City, Vietnam – supplies genuine Tecnocontrol zirconia oxygen sensors with technical consulting, fast quotation and on-site commissioning support across Vietnam and Southeast Asia.
Contact us: Sales +84 909 617 185 – Technical +84 979 117 185 – Email: [email protected]
