產品介紹∣氧氣感測器

ProboStat的一大特點是在高溫下進行測量時使用受控氣氛。建立可控的氣氛並非完全無關緊要。這主要是在氣體進入ProboStat之前完成的，並且可能需要預製氣體混合物，氣體混合，總壓控制，電化學泵送，潤濕和乾燥以及其他過濾/吸氣中的一種或多種流程。

在某些情況下，在目標區域測量pO2至關重要。有時輸送一定量的氧氣與目標區域存在一定量的氧氣（高溫反應，洩漏等）並不一樣。 NorEcs提供兩種類型的氧氣感測器：

MOSE氧氣感測器是一種微型YSZ感測器，不需要參考氣體，可以制造成適合ProboStat內部或外部氣體腔室的類型。內部/外部腔室也可以是膜的內部/外部。該感測器的構造是3線電極元件，並且還可充當S型熱電偶。
YSZ或其他固體電解質管替換樣品支撐管。
其他YSZ或其他固體電解質管代替樣品支撐管。

為了控制pO2，通常在相對氧化條件下使用O2和惰性氣體（例如Ar，N2）的混合物，在還原條件下使用CO + CO2混合物，在甚至更具還原性條件下使用H2 + H2O混合物。在後兩種混合物中，可以添加惰性氣體（例如Ar）以降低碳和氫的活性，而在原則上不影響氧的活性。監測pO2可用於檢查實際活動（反應？），向混合或泵送系統提供反饋或在暫態實驗中提供暫態pO2的資訊。但是，應該意識到，監測方法可能像控制（混合和泵送）方法一樣存在缺陷。系統可能具有不同的複雜程度。例如，可以將包含水蒸氣或CO2的氣體引導通過三個單元：第一個單元具有氧氣感測器和氧氣泵，通過它們將適量的氧氣泵入或泵出以達到所需的pO2; 第二個單元有實際樣品，是進行測量的地方; 第三個單元有一個感測器，用於監測離開測量單元的氣體的pO2，以為檢查之用。如果可能，可以將一個或多個感測器與測量單元集成在一起。但是，大多數使用者可能更樂於用混合或泵送台和一個感測器來安裝一個更簡單的系統。

MOSE（Micropoas™ 氧感測器元件）

現在，我們可以提供MicroPoas氧氣感測器（法國，Setnag），可以隨時安裝在任何版本的ProboStat裝置中使用。 MicroPoas具有內置的金屬參考物，因此不需要參考氣體。它具有很高的抗熱衝擊能力。

這種小型感測器（直徑 3mm，長度10mm）適用於連續測量從10-35到10 atm的分壓變化。標準版本ProboStat的工作溫度範圍為500至800°C，但也可提供600°C至1050°C的高溫版本。

讀取信號和測量溫度的儀器是也是可選的。需要輸入阻抗> 1000 Mohm。

ZOSHBI

雖然需要參考氣體，但此感測器型號的最高溫度遠高於更方便的 MOSE 感測器。

MOSE（Micropoas™ 氧感測器元件）

可以在ProboStat測量單元的樣品旁邊直接安裝一個微型氧氣感測器：

無需參考氣體。
標準版工作溫度為500ºC至800ºC。
高溫版本，範圍為600ºC至1050ºC，也適用於降低大氣壓的情況。
10-30至10 atm pO2。
即用型感測器，S型熱電偶和電位電極的元件。
可安裝在ProboStat的室內和室外。
對於任何ProboStat配置（在訂購時指定用途：內腔或外腔，感測器的總長度或告知我們樣品支撐管的長度）

下圖顯示了ProboStat樣品支撐管旁邊的MOSE感測器的尖端。

ZOSHBI

溫度範圍從 500 到 1400ºC。
安裝於氣體入口內螺紋上，(下圖) 。

傳感器長度受 ProboStat 系統長度及測量目的 (棒狀樣品、圓盤樣品或其他) 影響，因此訂購時請指定所需的傳感器長度。

The use of controlled atmospheres during measurements at high temperatures is a specialty of the ProboStat. Nevertheless, the establishment of controlled atmospheres is not entirely trivial. This is mainly done before the gas enters the ProboStat, and may require one or more of prefabricated gas mixtures, gas mixing, total pressure control, electrochemical pumping, wetting, and drying and other filtering/gettering.

In some cases measuring pO2 at the region of interest is paramount; sometimes sending certain amount of oxygen is not same as having certain amount of oxygen at the target area (high temperature reactions, leakage, etc.) NORECS provides following types of oxygen sensors:

The MOSE oxygen sensor is a tiny YSZ sensor that requires no reference gas and can be built to fit either in the inner or the outer gas chamber of ProboStat. The inside/outside chamber can also be the inside/outside of a membrane. The sensor is built to be as 3 wire electrode assembly and also acts as S-type thermocouple.
ZOSHBI oxygen sensor for ProboStat inner chamber.
Other YSZ or other solid electrolyte tube replacing the sample support tube. Setup guide.

In order to control pO2 one usually uses mixtures of O2 and an inert gas (e.g. Ar, N2) for relatively oxidizing conditions, CO+CO2 mixtures for more reducing conditions and H2+H2O mixtures for even more reducing conditions. In both the latter types of mixtures, additions of inert gas (e.g. Ar) can be done to lower the activity of carbon and hydrogen without, in principle, affecting the oxygen activity. Monitoring of pO2 can be useful to check the actual activity, to provide feedback to a mixing or pumping system, or to provide information of instantaneous pO2 in transient experiments. However, one should be aware that monitoring methods may have flaws just like control (mixing and pumping) methods. Systems may be built with different levels of sophistication. For instance a gas containing water vapour or CO2 may be led through three cells: The first has an oxygen sensor and an oxygen pump by which an appropriate amount of oxygen is pumped in or out to reach the desired pO2. The second cell has the actual sam

MOSE (Miniature oxygen sensor assembly)

In-situ miniature oxygen sensor assembly ready for use in any standard ProboStat. MOSE has built-in metal reference so no reference gas is required. It has high resistance to thermal shocks. This miniaturized sensor (diameter = 3 mm, length 10 mm) is suitable for measuring continuously partial pressure variation from 10-35 to 10 atm. Working temperature range for the normal version is 500 to 800°C, but high temperature version with range 600°C to 1050°C is also available. Instrumentation for reading the signal and measuring the temperature is optional. The input impedance > 1000 Mohm is required.

ZOSHBI

While requiring a reference gas, this sensor model has way higher maximum temperature than the more convenient MOSE sensors.

MOSE (Miniature oxygen sensor assembly)

A tiny oxygen sensor can be mounted directly next to your sample in the ProboStat measurement cell:

No reference gas required
Low temperature version operating temperature 500ºC to 800ºC
High temperature version, range 600ºC to 1050ºC also suitable for reducing atmospheres
10-30 to 10 atm pO2
Ready to use assembly of sensor, S-thermocouple and potential electrode
Mountable at both inside- and outside- chamber of ProboStat
For any ProboStat configuration (specify purpose on order: Inner or outer chamber, total length of the sensor or inform us on the length of your sample support tube)

Picture below shows the tip of the MOSE sensor next to a ProboStat sample support tube.

ZOSHBI

Temperature range from 500 to 1400ºC
Mounted on the threads of the inner in gas entry(the figure below)

Sensor length is affected by ProboStat system length and measurement purpose (bar sample, disc sample, or other) So when ordering, specify the desired sensor length.