Last time Xiaobian introduced to you a part of the commonly used detection instruments in the biogas desulfurization and purification project, and then Xiaobian continued to introduce to you, small partners in need can be collected and read slowly.~~

1.液位检测仪表

1. Level measuring instrument

液位检测仪表是沼气工程 控制系统常用仅表，早期液位检测大多采用纯机械式仪表，如今已普遍采用浸透了电子技术的机电一体液位检测仪表。

Liquid level detection instrument is a common meter in the control system of biogas engineering. In the early stage, pure mechanical instrument was mostly used for liquid level detection. Now, electromechanical level detection instrument immersed in electronic technology has been widely used.

液位检测仪表按丈量方式可分为连续丈量和限位丈量两类。限位丈量仪表可称液位开关，当液位处于设定位置时发出相应的开关信号，它在沼气工程自动控制中有诸多应用。

The liquid level measuring instruments can be divided into two categories: continuous measurement and limit measurement. Limit measuring instrument can be called liquid level switch. When the liquid level is in a set position, it sends out the corresponding switch signal. It has many applications in the automatic control of biogas engineering.

2.浊度检测仪表

2. Turbidity Detector

浊度是沼气工程出水水质指标之一。浊度检测仪根据光学办法，以一定强度和波长的光映照被测液体，用光敏元件在恰当位置以恰当的角度来检测透射光或散射光的强度，不同的光强惹起光敏元件产生不同的电信号，经变送器转换为与浊度值对应的规范电信号输出。

Turbidity is one of the effluent quality indexes of biogas project. According to the optical method, the turbidity detector reflects the measured liquid with a certain intensity and wavelength of light, detects the intensity of transmitted light or scattered light with the photosensitive element at an appropriate position and at an appropriate angle. Different light intensity causes the photosensitive element to produce different electrical signals, which are converted to the standard electrical signal output corresponding to the turbidity value by the transmitter.

3.固体悬浮物/污泥浓度检测仪表

3. Solid Suspension/Sludge Concentration Detector

固体悬浮物/污泥浓度检测仪表的检测原理与浊度检测仪表类似，可用于沼气工程进、出水的固体悬浮物的检测。此仪表需设置清洗光学丈量部件的安装。正式运用前，应在实验室用蒸馏法获取丈量点水样的固体悬浮物(或污泥）的真实浓度，以此对仪表停止标定。

The detection principle of solid suspended solids/sludge concentration detector is similar to turbidity detector. It can be used to detect solid suspended solids in inlet and outlet water of biogas project. The instrument needs to be installed with cleaning optical measuring parts. Before formal application, the real concentration of solid suspended solids (or sludge) in measured water samples should be obtained by distillation method in the laboratory so as to stop the calibration of the instrument.

4.PH检测仪表

4. PH Testing Instrument

PH检测仪表的传感器，可由丈量电极和参比电板组成复合电极，丈量电极通常采用PH玻璃电极，由于扩散作用，被测液体中的氢离子进入玻璃电极的球泡薄膜内部，在里面的电极上构成一定电位，参比电极提供一个与被测液体PH无关的恒定电位，经过检测丈量电极和参比电极之间的电位差，便可肯定被测液体的PH。

The sensor of PH measuring instrument can be composed of measuring electrode and reference plate. The measuring electrode usually adopts PH glass electrode. Because of diffusion, the hydrogen ions in the measured liquid enter into the bulb film of the glass electrode and form a certain potential on the inner electrode. The reference electrode provides a constant potential independent of the measured liquid PH. After testing the measuring electrode and the reference plate, the hydrogen ions in the measured liquid enter into the bulb film of the glass electrode. By referring to the potential difference between the electrodes, the PH of the measured liquid can be determined.

5.沼气成分检测仪表

5. Biogas Composition Detection Instrument

目前，国内外对沼气、生物自然气制取过程中的气体成分检测多采用红外(NDIR)、色谱(GC)、质谱(MS)气体剖析技术。这些技术在实践应用中存在不同的局限：GC运用需求载气和耗材，响应时间长，专业性请求高；MS价钱昂贵，维护本钱高，操作复杂。NDIR剖析仪操作简单，无耗材，但不能剖析对称构造无极性双原子分子(O2、N2、H2)气体，因而通常与电化学传感器配合工作。

At present, infrared (NDIR), gas chromatography (GC) and mass spectrometry (MS) are widely used to detect gas components in the process of biogas and biogas production at home and abroad. These technologies have different limitations in practical application: GC needs carrier gas and consumables, long response time, high professional requirements; MS is expensive, high maintenance cost and complex operation. NDIR analyzer is simple to operate and has no consumables, but it can not analyse symmetrically structured non-polar diatomic molecules (O2, N2, H2) gas, so it usually works with electrochemical sensors.

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