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. Level measuring instrument
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.
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. Turbidity Detector
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. Solid Suspension/Sludge Concentration Detector
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 Testing Instrument
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. Biogas Composition Detection Instrument
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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