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March 1, 2006

Focus On: Pressure Measurement

Dorothy Lozowski

These miniature regulators are ideal for gas instruments

The compact DM3000 (photo, left) allows flow control systems for process or laboratory instrumentation to be constructed in small spaces. With a flow coefficient (Cv) of 0.1 and a maximum inlet pressure of 500 psig, this regulator offers a choice of outlet pressure ranges of 1–30, 1–60, 2–100 and 3–250 psig. Fabricated from 316L stainless steel with Hastelloy diaphragms and an Inconel poppet, the DM3000 features a PCTFE seat with a poppet design that is self-centering for repeatable positive closure. The regulator operates over a temperature range of –40–150°F. — Veriflo Division of Parker Hannifin Corp., Richmond, Calif.

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This pressure gauge is an economical choice

The Ashcroft Type 1259 process gauge (photo, center) offers an accuracy of ±0.5% of its span with a range from vacuum to 20,000 psi. With a 4.5-in. dial, the Type 1259 has 316 stainless-steel or Monel wetted parts. This gauge also features an in-field liquid-fill capability that eliminates the need for a dedicated fill kit. — Dresser Instruments, Stratford, Conn.

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Identify impurities while regulating pressure

These Smart Indicating Regulators (SIR) (photo, top right) incorporate Smart Indicating Purifiers (SIP) to identify and chemically lock in the three major contaminants that impact analytical systems — moisture, oxygen and hydrocarbons. If the contaminants enter the gas stream, the purifier media begin to turn color. Spent purifiers can be replaced without interrupting the gas flow. A two-medium cartridge system is available to remove moisture and hydrocarbons for applications that use air as the carrier gas. — Airgas, Inc., Radnor, Pa.

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Measure pressure underwater with submersible transmitters

The VersaLine VL3000 Series (photo, middle right) of submersible transmitters is designed for applications involving groundwater, wastewater and seawater. The stainless-steel housing satisfies many applications, and titanium is available for environments where stainless steel is not suitable. The standard, polyurethane cable is vented and molded to the transmitter to provide a waterproof assembly. Kevlar is used to avoid cable elongation for depths up to 5,000 ft, such as required for deep wells. Tefzel cable is available as an alternate for harsh environments. — Process Measurement & Controls, Inc., Danbury, Conn.

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Reduce transducer failure due to humidity with this enclosure

The Model 299 Dri-Sense (photo, bottom right) is designed for field termination of submersible or below-ground pressure transducers as well as transducers used in sanitary and chiller applications. Desiccant material in the cover captures moisture to provide a barrier against the ingress of water into the transducer’s sensor and electronics. The visible change in color from blue to pink indicates that the desiccant is saturated. Regeneration can be achieved by placing the desiccant-filled cover in a 200°F oven for about 3–4 hr. — Setra Systems, Inc., Boxborough, Mass.

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A pressure sensor that can rotate for optimal viewing

These sensors feature a 4-digit, LCD display with pressure indication in either psi, bar, kPa or MPa (megapascals). The PS400 and PS500 sensors are encased in a 34-mm. dia., stainless-steel housing and offer a variety of stainless-steel pressure connections. The sensor display is tilted at a 45-deg. angle and can be inverted electronically for easy reading. The PS500 Series has a connections that allows the housing to rotate 360-deg. prior to locking the sensor in place. — Turck Inc., Minneapolis, Minn.

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Monitor vacuum levels with this instrument

The VacuGuard (photo, left) is a battery-powered instrument that can be used to validate the vacuum levels in bulk gas vessels, vacuum-jacketed piping and delivery lines. The instrument’s small size and portability make it suitable for use in the field. — Televac/ETI, Huntington, Pa.

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A line of 3V pressure sensors is now available

This new line of pressure sensors accepts a supply voltage of 3 V and comes in a variety of models including differential-, gauge- and absolute-pressure versions. The X3 Series can measure pressure in a range of 50–1,000 kPa with an accuracy of ±5% of full scale from 0 to 50°C. — Servoflo Corp., Lexington, Mass.

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These pressure transmitters offer high accuracy

This company has achieved performance improvements to reach high-accuracy levels in its pressure transmitters. The Premium Performance line carries an accuracy specification of ± 0.025% for spans as low as 10% of the maximum span. Even when calibrated for spans as low as 1.25% of maximum span, the accuracy is better than ±0.05% of the span. The Multirange Line of transmitters has an improved accuracy to ±0.05% of span, and the Standard Performance Line has an accuracy of ±0.06% of span. All of these pressure transmitters use a 4–20-mA or digital-output signal that is compliant with HART and Foundation-Fieldbus communication protocols. — Invensys Process Systems, Foxboro, Mass.

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These pressure transmitters can handle corrosive media

These transmitters have a media-wetted housing made from chemically-resistant polyphenylensulfide (PPS) plastic. The KTU3000 sensors (photo, right) can be calibrated to individual requirements in the range of 7.5–1,500 psi. Several current or voltage output signals are available. All KTU3000 transmitters are EMC-compliant and CE-marked. — Sensortechnics. Inc., Walpole, Mass.

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