Transmitters Certified For Use In Hazardous Areas

Endress and Hauser's M-class Deltabar M PMD55 transmitter and its Cerabar line of pressure transmitters have Atex, FM, CSA, NEPSI and IEC Ex certifications for use in hazardous areas. The Deltapilot M has Atex, FM, CSA, drinking-water (NSF, KTW and ACS) and NACE approvals. The new M-class range of transmitters, manufactured in the US, makes it easier for legacy plants to upgrade to digital communications systems such as Hart and Wirelesshart, according to the company. It can be difficult for a plant to upgrade all of its transmitters at one time, but the M class allows users to install instruments on an as-needed basis.

M-class transmitters incorporate 4-20mA two-wire analogue outputs with superimposed Hart 6.0 digital communications. Remote operation is available via a Hart Field Communicator handheld terminal or the wireless Field Xpert personal digital assistant (PDA) with an integrated 3.5in (8.9cm) touch screen. The transmitters can also be configured with Endress and Hauser's Fieldcare asset management tool, based on FDT technology. An optional four-line liquid-crystal display (LCD) can be used for local display and operation on the transmitters. The local display shows measured values and dialogue texts as well as fault and notice messages in plain text, thereby supporting the user at every stage of the operation.

The LCD of the device can be turned in 90deg stages. The transmitters can be mounted on a tank, wall or pipe - in either a vertical or a horizontal orientation. The turnable display facilitates the operation of the transmitter and reads the measured values with either orientation. The Deltabar M PMD55 differential-pressure transmitter can be used for the flow measurement of gases, vapours and liquids. Typical applications also include the level, volume and mass measurement of liquids. The Deltabar M transmitter works over measuring ranges of 0.15psi to 600psi, with a maximum recommended turndown of 100:1.

Reference accuracy is up to 0.075 per cent of full scale. The Deltabar M is a direct replacement for the Rosemount 1151 analogue transmitter; as such, a Rosemount user can upgrade directly to the Deltabar M digital Hart-based flow transmitter without having to change piping or add a coplanar adapters. Flow measurements are available in five modes: volume flow, norm volume flow (Europe), standard volume flow (US standard conditions), mass flow and per cent. The transmitter has two totalisers. One totaliser can be reset to zero and the totalising units can be individually set for each totaliser.

This enables daily and annual quantity totalising. The Deltabar M transmitter features an aluminium housing with protective powder coating and 316L stainless-steel process connections. Customers are offered a choice of Viton, PTFE, NBR or EPDM seals. The operational temperature ranges from -40F to +185F. The transmitter is suitable for use in oxygen and ultra-pure-gas applications. The Cerabar M line of transmitters can be used for measuring the absolute and gauge pressure of gases, steam or liquids in all process areas.

Typical applications also include the level, volume and mass measurement of liquids. The Cerabar M is available in three models: the PMC51, the PMP51 and the PMP55. The PMC51 features a capacitive measuring cell and ceramic isolating diaphragm; the PMP51 has a piezo-resistive measuring cell and a metal-welded process isolating diaphragm; and the PMP55 incorporates a diaphragm seal. The measuring range is from -15psi to 6,000psi, depending on the model, with reference accuracy up to 0.075 per cent and turndown of 100:1.

With diaphragm seals, the Cerabar M can be used in temperatures up to 752F. The Cerabar M transmitter features either a stainless-steel or an aluminium or housing with a protective powder coating. A stainless housing is available for hygienic applications. With appropriate seals, the Cerabar M can be used in oxygen, hydrogen, silicon-free and ultra-pure-gas applications. The Deltapilot M line of transmitters is used for measuring hydrostatic liquid level in vented tanks.

Deltapilot M transmitters indicate liquid level by measuring the force exerted on the diaphragm induced by the weight of the fluid. The Deltapilot M range of transmitters utilises Endress and Hauser's patented Contite measurement cell, which is said to offer excellent recovery times in processes where thermal shock is prevalent. Contite cells provide high performance in a variety of liquid-level applications. The Deltapilot M transmitters are available in four models: the FMB50, the FMB51, the FMB52 and the FMB53.

The transmitters can be mounted offline or can be submerged in a tank via a cable or a steel rod. The measuring range of the Deltapilot transmitter can be as large as 330ft (100m) and as small as 3ft, while maintaining an accuracy of 0.1 per cent at process temperatures up to +212F. The Deltapilot transmitters have a programmable characteristic curve that permits volume and mass measurements in any tank shape. The transmitters can also measure level in tanks with superimposed pressure, foam, agitators or liquefied gases.

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