How to properly maintain the electromagnetic flowmeter in winter

As a precision instrument, the intelligent electromagnetic flowmeter should be maintained in daily use to ensure that it can work stably. Now winter has come quietly, and the temperature has dropped, which is a test for the intelligent electromagnetic flowmeter. The winter in the south is not a big problem. In the winter in the north, with the sudden drop in temperature, when the measured medium is transmitted to the transmitter through the measuring pipeline, the ambient temperature is often too low to freeze, solidify, precipitate crystals, etc. The low ambient temperature exceeds the normal working temperature range of the instrument used, which directly affects the accuracy of the instrument measurement display. The measuring media of various instrument points such as pressure, flow, liquid level, and temperature are mostly liquids. Under the influence of low temperature, it is more likely to cause measurement errors. In severe cases, it may cause poisoning, fire, explosion and other safety accidents, which have to be paid attention to. Therefore, when

winter comes every year, the anti-cold and anti-freeze work of instruments and meters should be treated as the top priority of maintenance work. Some large instrumentation users have made preparations in advance. For example, power plants, petroleum, chemical, water plants, etc. have formulated systems suitable for their own companies to prevent cold and frost on instruments, and have carried out antifreeze, sewage treatment and other aspects of the instruments. Below, we will explain the key points that instrument users need to pay attention to in winter instrumentation antifreeze.

To do a good job of antifreeze on instruments, product selection is a key. When installing instruments in the early stage, instrument users should consider the working conditions of the instruments and select instruments with insulation devices. According to the type and purpose of the instrument and the geographical location to be installed, the insulation and antifreeze requirements of the instrument are proposed, and then submitted to the manufacturer for processing.

Flow meter insulation measures Use insulation materials for insulation, that is, use insulation materials to wrap the parts of the intelligent electromagnetic flowmeter that are easy to freeze or afraid of freezing. When winter comes, check and discharge sewage frequently to prevent the insulation materials of the packaging from being damaged.
1. Steam heating measures: that is, use pipe steam heating for insulation. Before winter insulation steam delivery, check whether the steam insulation pipeline is unobstructed or blocked. It is best to have steam flowing 24 hours a day, not too hot. Sometimes the amount of steam supply for insulation should be adjusted according to the weather temperature changes to prevent the condensate in the pressure pipe of the transmitter from vaporizing due to high temperature and affecting the operation of the transmitter, or freezing due to low temperature and affecting the smooth operation of the transmitter.

2. Insulation protection box measures: a. The electric heating tube heating insulation box is composed of three parts: the box body, the heater, and the instrument bracket. Its structure is the same as the protection box. The difference is that the box is equipped with an electrical heating device. The heating device is composed of an electric heating tube and a temperature controller. There is a socket on the side of the box. When the power is turned on, the box is heated to the required temperature, and then the temperature controller is connected to the power to continue heating. Through repeated work, the temperature in the box can be kept within a certain range. The main parameters of the constant temperature heater are:
⑴, rated voltage 200V.50Hz; ⑵, rated power 300~500W; ⑶, control temperature can be set by the user; ⑷, constant temperature heater can also be made into explosion-proof type; ⑸, there are three kinds of electric heating pipe materials: copper pipe, carbon steel pipe, stainless steel pipe.
a. Steam pipe heating insulation box, the heating pipe is made of metal pipe into S-shaped structure. The upper and lower parts of the box body are welded with welding type through-plate joints and heating pipes. The heating pipe is installed in the box for upper inlet and lower outlet, and the purpose of heating is achieved by circulating steam in the tube cavity. The heating pipe material is generally divided into two types, namely copper pipe and seamless steel pipe (carbon steel).
b. Add another layer of insulation cotton to the key instrument box, and add glue to seal the door of the insulation box and the inlet and outlet of the pipeline to achieve better insulation and antifreeze effect of the instrument system.

III. Maintenance measures

1. Installation measures
Reasonably select the installation location: dry and rain-free place.

2. Inspection measures
If conditions permit, a dedicated person shall conduct technical confirmation and technical treatment on a daily basis to check whether the insulation material is damaged and whether the steam pipeline is blocked.

3. Alarm measures
If conditions permit, a small sound and light alarm device for steam leakage or power failure can be installed to facilitate the discovery and timely rectification of hidden dangers of insulation and antifreeze measures.

4. Inspection measures
The person responsible for regional instrument maintenance shall conduct regular inspections according to the scheduled inspection route. During the inspection, it is necessary to check whether the insulation pipeline valves, insulation boxes, drain devices, insulation material packaging are intact, and electric heating power supply components are normal. The instruments of the easy-to-freeze device shall be inspected and inspection records shall be kept. The instruments and their insulation and antifreeze measures shall be maintained in a dry, complete and clean manner to promptly solve the insulation and heating problems on site.
Before the insulation steam is delivered, it is necessary to check whether the insulation pipeline is unobstructed. In addition, it is necessary to check and drain the sewage frequently in winter to prevent the insulation pipe from being blocked. Once there is a blockage, it is easy to be frozen, and then it will be a big trouble, haha. Sometimes, the steam supply must be adjusted according to temperature changes to prevent the temperature from being too high, causing the condensate in the transmitter pressure pipe to vaporize and affect the operation of the transmitter.