How should the instrument be maintained and maintained in winter?

In winter, when the measured medium is transmitted to the transmitter through the measuring pipeline, freezing, solidification, and crystallization often occur when the ambient temperature is too low. The normal working temperature range directly affects the accuracy of the instrument measurement display. For this reason, antifreeze treatment must be carried out on the instrument and the instrument measuring pipeline. The objects that require heat tracing and heat preservation mainly include the transmitter installed in the instrument incubator, the external float type liquid level transmitter or other forms of liquid level installed in the open air. Transmitting unit, detection pipeline and measurement pipeline of instruments such as pressure, differential pressure and flow. Avoid such accidents by selection or other means. The measures taken usually include: type selection, thermal insulation and heat tracing, maintenance (point inspection, sewage discharge), etc. 1. Type selection measures Choose instruments with heat preservation devices. The differential pressure transmitter puts forward the thermal insulation and antifreeze requirements of the instrument according to the category and use of the instrument and the geographical location to be installed, and then submits it to the manufacturer for processing. In some places in the north, the temperature difference between day and night is too large, and it can reach more than -20 degrees at night. If you solve it from the selection of models, the cost performance is quite uneconomical. And the choice of heat preservation and heat tracing, maintenance (point inspection, sewage discharge) and other methods is the solution to antifreeze. 2. Heat preservation measures Use heat preservation materials to keep heat, that is, wrap the parts of the instrument that are prone to freezing or are afraid of freezing with heat preservation materials. When winter comes, it is necessary to check and discharge sewage frequently to prevent damage to the thermal insulation material of the packaging. 3. Heat tracing measures 1. Steam heat tracing measures use pipe steam heating to keep warm. Before heating and delivering steam in winter, check whether the steam insulation pipeline is unblocked or blocked. The steam is open for 24 hours, not too hot, and sometimes the amount of heat preservation steam should be adjusted according to the weather temperature change, so as to prevent the temperature from being too high, causing the condensate in the pressure pipe of the transmitter to vaporize and affect the work of the transmitter or due to the temperature being too low The freezing of the condensate in the pressure pipe of the transmitter will affect the smooth operation of the transmitter. 2. Measures for heat preservation and protection box a. The electric heating tube heating and heat preservation box is composed of three parts: the box body, the heater, and the instrument bracket. Its structure is the same as that of the protection box. The structural form is as shown in the figure. The electric 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 and the inside of the box is heated to the required temperature, the temperature controller is turned on to continue to heat up. . The temperature in the box can be kept within a certain range through repeated work. b. Steam pipe heating insulation box, the heat tracing pipe is made of metal pipes with S-shaped structure. The upper and lower parts of the box are welded with welded plate-through joints and heat tracing pipes. The circulation in the lumen achieves the purpose of heating. Heat tracing pipe materials are generally divided into two types, namely purple pipe and seamless steel pipe (carbon steel). c. Add a layer of insulation cotton to the key instrument box, and add glue to the door of the insulation box and the inlet and outlet pipelines to seal, so as to achieve the effect of heat preservation and antifreeze of the instrument system. 3. Measures of electric heating belt Electric heating heat preservation technology is a new type of heating technology that directly converts electric energy into heat energy. Install insulation cables, wrap the heating cables around the instrument, or stick them inside the instrument cabinet (but pay attention to the length of the heating cables used, which should be economical and moderate). It is suitable for heat tracing, antifreeze and heat preservation of pipelines, valves, shock-resistant pressure gauges, pump bodies of differential pressure transmitters, or single-phase constant power electric heating cables for maintaining the process temperature of instrument pipelines. The heat generation per unit length is constant, and the output power is not affected by the ambient temperature. The length of use is proportional to the power, and it can be cut and cut at will during installation, but there must be a heating section (that is, at least 2.5m). grounded. It is mainly used for antifreeze and heat preservation of various pipelines and instruments, and the maximum maintenance temperature is 150°C. Note: For the heat tracing and insulation of liquid pipelines that require strict temperature control (with a temperature controller).

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