Pressure gauges installed on site, generally use a surface diameter of 100mm, such as high installation position, poor lighting conditions; 150mm or 200-250mm can be used.
The pressure gauge should be calibrated before installation and can only be installed and used after passing the test. The pressure gauge should be fixed to the specially machined joint during installation and should be shimmed; instead of being wrapped or directly attached to the valve. The pressure gauge should be installed in a location that is easy to operate and maintain.
In order to ensure accurate measurement, the pressure point must be representative. If you choose to be on a straight pipe section with a smooth flow rate, do not bend or bend the pipe; the pressure pipe should not protrude into the equipment and piping. There are certain requirements for the installation position of the pressure point. Take the horizontal or inclined pipeline as an example: First, when the medium is gas. In the upper half of the pipe. 2. When the medium is steam, it is within the range of 0-45 degrees between the upper part of the pipe and the horizontal center line, preferably on the horizontal center line of the pipe. 3. When the medium is liquid, the lower half of the pipe is within an angle of 0-45 degrees from the horizontal centerline. If the conditions are limited, you can choose a reasonable position according to the actual situation.
Install a water vapor or a pressure gauge with a medium temperature of more than 60 degrees on site to prevent damage to the instrument components by overheating. A ring or U-bend should be added between the pressure tap and the pressure gauge valve (see Figure 1). The installation position of the valve in this figure is different from that of some self-controlled installation drawings. The installation drawing book is to install the valve at the root (red dot), and the valve is exposed to high temperature and is easy to leak and damage. When the valve is installed according to Figure 1, the valve is at normal temperature, which greatly prolongs the service life of the valve. This is proved by many years of practice.
When measuring the pulsating pressure of the compressor or pump outlet, in order to protect the pressure gauge and make the measurement accurate, a buffer or a throttle can be installed in front of the pressure gauge; if necessary, a damping valve can be added to increase the pressure to the pressure when the pressure changes. Table resistance.
When measuring the medium containing dust, particles or impurities, the pressure tube should be thickened, and if necessary, the dust collector or the drain valve should be installed to facilitate the blowing of the pressure guiding tube. A water separator should be installed for humid gas.
For spacers that can only be used in special occasions, the installation method of the isolator is shown in Figure 2.
The distance between the pressure gauge and the pressure tapping point should be as short as possible. In order to avoid measurement lag, the maximum length of the pressure guiding tube should not exceed 50 meters. If it is too long, consider using a remote pressure gauge. For the crystal that is easy to crystallize, the blocked medium should be equipped with a live joint for future disassembly.
When installing a low pressure gauge, the influence of the static pressure caused by the liquid column on the meter measurement should be avoided. For pressure measurement of critical equipment, two pressure gauges can be installed separately to prevent accidents.
In order to ensure the reliability of pressure measurement and production safety, in addition to regular maintenance inspection, the pressure gauge must be verified according to the specified period.
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