glass rotor Meter is a simple, easy reading, use a very wide range of instantaneous flow measurement instruments. Environmental protection equipment in this area, more than the amount of up to 30,000 / year. Therefore, selecting, making good use of this instrument, is extremely important.

1 glass to the flow meter on the variety and choice

glass rotor flowmeter according to its purpose and scope of adaptation can be divided into: ordinary type, with tendons vascular type, micro-flow and shape of small, the decay resistance type, laboratory-type, insulation type, Alarm-and eight-resistant high-pressure series. Instruments developed countries in accordance with the series of spectrum, irrespective of any series, up from 1 mm to 100 mm calibre of a total of 12, is the scope of measurable flow: liquid (water) 0.1 ml / min to 40 cubic meters /, Gas (air) 1 ml / min to 1,000 cubic meters / time. For environmental equipment supporting the glass rotor flowmeter general not more than 10 mm calibre, measuring the flow of traffic is small.

glass rotor flowmeter can choose from the following aspects to consider.

1. measurement of the object. That is, measuring media type, size of pressure, and chemical properties. If liquids, gases medium, the medium of a corrosive decay resistance flow meter should be chosen.

2. Flowmeter own performance. The above conditions established general speaking, if there are no major price changes, the priority choice of the needle placed in the upper flow meter; a greater flow of the hole, is a direct flow of the scale, structure simple; external dimensions of the smaller, etc. . If small flow of the float-ball can be selected because of its measurement stability, not Jichen, high precision, good interchangeability.

3. chosen by price. Generally speaking, the high price of high precision. Selected according to the purpose of measuring instrument accuracy class, if only through the medium of control measure, the adjustment of trial operation, after the need has always been stable through this volume, accuracy is of secondary importance.

Second, glass rotor meteor of scale that

glass rotor flowmeter calibration, the plant is under the conditions used in the factory near ideal fluid in the water and dry air for calibration by the media. However, the use of flowmeters in the scene, there are two cases can not directly use it to the scale values: First, media measurement is not water and air, and the other is measurable and medium Although the water and air, but its status (temperature. Pressure) and calibration State are different. In this way, using the flow meter, in order to obtain the correct measurements, on a scale of the need to amend the problem. Therefore, solving the glass rotor flowmeter calibration amendment, making good use of this instrument is the key.

taking into account the use of environmentally friendly equipment rotor flowmeter with a large number of medium-measuring gas flow, below only when measuring the gas density medium amendment for discussion. As gas medium viscosity is very small, there was omitted from the discussion, the viscosity effects. Practice has proved that this amendment does not affect the accuracy.