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2 ABB Pressure Transmitters

Temperature and humidity considerations

High temperatures can have a detrimental effect, potentially causing premature component failure. When you exceed the deceives parameters it can have a significant effect on its performance.  Low temperatures can cause fill fluids to thicken, while high temperatures can cause them to vaporize. Variations in ambient temperature and pressure can also have an impact, particularly if the transmitter’s calibrated span is a small portion of its upper range limit. Atmospheric conditions such as direct sunlight or high winds can cause heating or cooling of transmitters, which can adversely affect their operation. Prolonged exposure to high humidity can also result in corrosion of the transmitter housing, and mountings. Transmitter housings are designed to protect electrical components against the ingress of moisture, caused by humidity.

ABB Pressure Transmitters: Wire, digital, or wireless

For the majority of applications where power is readily available, the two-wire ABB Pressure Transmitter is often the most practical choice. Because the current is protected against the effects of changing resistance along the line, signals can be relayed over long distances. Where the transmission of accurate data or large volumes of data is essential, the best choice is to opt for digital transmitters. With wiring and installation costs accounting for almost 50 percent of the total cost of a device, it makes both financial and technological sense to use wireless devices wherever possible. Wireless devices are used to be largely confined to specialist applications in remote installations such as water distribution or oil and gas. The WirelessHART protocol means industry now has an international standard that enables wireless instruments to communicate a wealth of standardized information throughout plant networks.

Hazardous areas

An electronic instrument is a potential source of electrical energy, which in certain conditions can discharge and ignite any accumulated mixtures of flammable gases, combustible dust, and ignitable fibers.  Various international standards, such as ATEX, FM, IEC, INMETRO, EAC, and NEPSI set out various measures for assessing the risk posed by hazardous environments, and the steps that need to be taken to minimize the risk of ignition.

Multivariable

For certain applications involving measurement of gases or fluids subject to rapid advantages are provided by multivariable pressure transmitter. This device offers a three-in-one solution for the measurement of flows of liquids, steam or gas with absolute pressure and temperature compensation, ideal for calculating changes in flow density. Incorporating three different forms of measurement into one unit can also significantly reduce installation costs using fewer devices.

Diaphragm Seals

Direct and remote seals are used to isolate pressure transmitters from conditions that will shorten their operational life and / or dramatically affect their performance. As such, they are ideal for a range of pressure measurement applications involving process fluids which operate at extreme temperature and are highly corrosive, dirty, viscous or laden with solids that can block, foul or solidify the impulse lines or the transmitter body. They also present a solution in applications where process wetted materials are required, such as Diaflex, PFA anti-stick, and anti-corrosion coatings, or materials for highly corrosive fluids. Remote seal transmitters can also provide an ideal solution for hygienic processes, such as in the pharmaceutical and food & beverage industries, where it may be undesirable to have a pressure measurement device in direct contact with the product.

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