Selection of pressure gauge for hydraulic press

Select the appropriate measurement range in order to ensure that the elastic element can work reliably in the safety range of the elastic deformation, in the table range selection pressure, must according to the size and pressure changes in the measured pressure speed, there is enough room, therefore, the upper limit value should be the maximum pressure may be higher than the value in the production process. According to the "Regulations" the automatic design of Chemical Technology Press, in the case of measuring the steady pressure, the maximum working pressure shall not exceed the upper limit value of 2/3 measurement; measurement of fluctuating pressure, the maximum working pressure shall not exceed the upper limit value of 1/2; the measurement of high pressure, the maximum working pressure shall not exceed the upper limit value of 3/5. The minimum measured pressure shall be no less than 1/3 of the upper limit of the instrument measurement. Thus, the linear relation between the output of the instrument and the quantity of the input can be ensured, and the accuracy and sensitivity of the instrument measurement result can be improved. The hydraulic press calculates the upper and lower limits of the instrument according to the maximum and minimum values of the parameters to be measured, and can not be used as the measuring range of the instrument directly. When we select the upper limit of the scale of the instrument, we should select it in the standard series stipulated by the state.

Selection of hydraulic press gauge should be based on the production process, production requirements, specific analysis of the specific circumstances. In order to meet the requirements of the process, should be in accordance with the principle of saving, comprehensive and comprehensive consideration, select the appropriate hydraulic pressure gauge type. The selection of instrument type must meet the requirement of process production. For example, whether remote automatic recording or alarm; by nature side medium (such as the temperature of the measured medium height, viscosity, corrosive, flammable and explosive, dirt etc.) whether to put forward special requirements on the instrumentation, on-site environmental conditions (such as temperature, humidity, magnetic field strength and the vibration of the instrument) type etc.. The oxygen pressure gauge of the hydraulic press and the ordinary pressure gauge can be exactly the same in structure and material, but oxygen must be banned from the pressure gauge. Because the oil into the oxygen system, easy to cause explosion. When the oxygen pressure gauge is used, the oil can not be used as the working medium as the ordinary pressure gauge, and the oxygen pressure meter shall avoid the oil pollution in the storage. If you have to use the existing oil pressure gauge to measure the oxygen pressure, you must wash it with carbon tetrachloride before use, and check it carefully until the oil free. Therefore, according to the requirements of the process, the correct selection of instrument type is an important prerequisite to ensure the normal operation of the instrument and safety in production. For example: the ordinary pressure gauge spring tube mostly uses the copper alloy (high pressure uses alloy steel), but the ammonia uses the pressure gauge, the spring tube material all uses the carbon steel (or stainless steel), does not allow to use the copper alloy. Since ammonia produces chemical reactions with copper, it will explode, so ordinary pressure gauges cannot be used for ammonia pressure measurements. Good after-sales service will make you feel at ease to use our products.