Introduction to the type of WIKA pressure gauge

The type of instrument must be selected to meet the requirements of process production. For example, do you need remote transmission, automatic recording or alarm; whether the nature of the side medium (such as the temperature of the measured medium, viscosity, corrosiveness, degree of contamination, whether it is flammable or explosive, etc.) imposes special requirements on the instrument. Environmental conditions (such as humidity, temperature, magnetic field strength, vibration, etc.) requirements for the type of instrument. Therefore, the correct selection of the instrument type according to the process requirements is an important prerequisite for ensuring the normal operation and safe production of the instrument.
       For example, the spring tubes of WIKA ordinary pressure gauges are mostly made of copper alloy (high-pressure alloy steel), while the materials for ammonia pressure gauge spring tubes are made of carbon steel (or stainless steel), and copper alloy is not allowed. Because ammonia reacts with copper and can explode, ordinary pressure gauges cannot be used for ammonia pressure measurement.

      Oxygen pressure gauges and ordinary pressure gauges can be identical in structure and material, except that oxygen pressure gauges must be banned. Because the oil enters the human oxygen system, it is easy to cause an explosion. When using the oxygen pressure gauge, it is not possible to use oil as the working medium like the ordinary pressure gauge, and the oxygen pressure gauge should strictly avoid contact with oil during storage. If it is necessary to measure the oxygen pressure with an existing oil pressure gauge, it must be repeatedly cleaned with carbon tetrachloride before use, and carefully checked until there is no oil.