Is there a requirement for the working environment temperature of the diaphragm pressure gauge?
The diaphragm pressure gauge actually has certain requirements on the temperature of the working environment during the operation. If the diaphragm pressure gauge is used in an environment with too high temperature, it will also have some bad effects. So everyone first figure out how much temperature the diaphragm pressure gauge can withstand. So what is the heat-resistant temperature of the diaphragm pressure gauge?
In the standards of various diaphragm pressure gauges in our country, generally only the normal working environment temperature of the diaphragm pressure gauge is specified. For example, the general diaphragm pressure gauge is -40-70 degrees, and the diaphragm pressure gauge is -25-55 degrees, but there is no regulation. The heat-resistant temperature.
Although there are diaphragm pressure gauge factories that produce heat-resistant diaphragm pressure gauges or high-temperature diaphragm pressure gauges, few manufacturers of diaphragm pressure gauges clearly indicate the heat-resistant temperature or high-temperature temperature of diaphragm pressure gauges. This also makes users of diaphragm pressure gauges feel embarrassed.
What is the operating temperature of the so-called heat-resistant diaphragm pressure gauge or stainless steel high-temperature resistant diaphragm pressure gauge? Is it the working environment or the measured medium temperature?
Here we must first understand the welding temperature of various stainless steel diaphragm pressure gauge spring tubes when welding, they are:
Brazing (tin soldering), the temperature is 120 degrees during welding, and is mostly used for welding copper joints and copper spring tubes.
Silver welding, with a temperature of 600 degrees during welding, is mostly used for welding copper joints and stainless steel spring tubes.
Argon arc welding, the welding temperature is 1500 degrees, it is mostly used for welding steel joints and stainless steel spring tubes.
So in general, as long as you know the welding method of the spring tube of the diaphragm pressure gauge, you can also know the ambient temperature that the diaphragm pressure gauge can withstand, that is: the brazed diaphragm pressure gauge can work normally below 120 degrees, silver welding The type diaphragm pressure gauge can work normally below 600 degrees, and the argon arc welding type diaphragm pressure gauge can work normally below 1500 degrees.
In addition, there are certain requirements for the materials of some components used in heat-resistant diaphragm pressure gauges or high-temperature resistant diaphragm pressure gauges. For example, the gasket for diaphragm pressure gauges must not be made of plastic, but aluminum or other high-temperature resistant materials should be used; The dial of the diaphragm pressure gauge shall not use a plastic plate, but an aluminum plate or an iron dial. Because at higher temperatures, the plastic liner and dial will be deformed and affect the operation of the pointer, making the diaphragm pressure gauge lose its function.
