In the field of high-temperature gas composition detection,The Nernst 1231HGP high-voltage zirconia probe has become a key equipment for flue gas monitoring in industries such as power and metallurgy due to its excellent pressure resistance and temperature adaptability.The working temperature characteristics of the probe directly affect the measurement accuracy and service life, and a deep understanding of its temperature parameters is of great guiding significance for equipment selection and working condition adaptation.

　　1、 Core operating temperature range

The design working temperature range of the Nernst 1231HGP high-pressure zirconia probe is 600 ℃ to 850 ℃, which is determined based on the optimization of the ion conductivity characteristics of zirconia solid electrolyte (ZrO ₂+Y ₂ O ∝). When the temperature is below 600 ℃, the migration rate of oxygen ions in the electrolyte lattice significantly decreases, resulting in unstable potential signal output; When the temperature exceeds 850 ℃, although the ion conduction efficiency is improved, it may pose a risk of thermal deformation of the internal sealing material of the probe. Under special working conditions, the effective measurement range can be extended to 500-900 ℃ through the use of a matching constant temperature controller, but it is necessary to strictly follow the gradient heating curve provided by the manufacturer.

　　2、 The relationship between temperature and measurement accuracy

Within the standard operating range, the probe output voltage exhibits a strict Nernst equation linear relationship with the oxygen partial pressure (E=RT/nf · ln (P ₁/P ₂)). Experimental data shows that when the temperature is controlled at 700 ± 20 ℃, the measurement error can be reduced to within ± 0.5% FS. The built-in heating element and temperature compensation module of this model can automatically maintain the thermal balance of sensitive components, and even if the external flue gas temperature fluctuates by 150 ℃/min, the response time can still be guaranteed to be less than 15 seconds.

　　3、 Temperature control strategy in high-pressure environment

As a high-pressure zirconia probe (designed to withstand pressure up to 3MPa), its temperature management needs to balance mechanical strength and thermal stress. During installation, it is necessary to ensure that:

1. Apply thermal grease evenly to the flange connection area to avoid local overheating;

2. The temperature difference between the cooling airflow and the high-temperature flue gas should not exceed 400 ℃ to prevent thermal shock cracking of the casing;

3. In corrosive atmospheres such as garbage incineration, it is recommended to increase the working temperature to above 800 ℃ to suppress the corrosion of SO ₂/SO Ⅲ on zirconium heads.

　　4、 Temperature precautions during maintenance

Daily maintenance should focus on:

1. Check the resistance of the heating cable every month (normal range 50-70 Ω), any abnormal increase may indicate aging of the heating element;

2. When shutting down for cooling, a step-by-step cooling program should be followed (with a temperature drop of ≤ 100 ℃ per hour), as sudden cooling can cause microcracks in the zirconia ceramic substrate;

3. Before long-term shutdown, the probe should be stored in a dry nitrogen environment to avoid condensation of water vapor on the surface of the sensitive electrode.

Accurately controlling the working temperature characteristics of Nernst 1231HGP and dynamically adjusting the temperature control strategy based on operating parameters can enable the zirconia probe to continuously output reliable data under abnormal conditions. It is recommended that users cooperate with the original factory's dedicated temperature calibrator for quarterly calibration, and ensure the stability of the measurement system throughout its entire lifecycle through three-dimensional coupling verification of temperature pressure concentration.