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Pressure transmitter measures absolute or gauge pressures

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article image Measures up to 700 bar and operates in temperatures up to 350ºC.

ENDRESS + Hauser has released the Cerabar-S pressure transmitter for measuring absolute or gauge pressure of gases, steams or liquids in all process industries and applications. It measures up to 700 bar, operates in direct contact with the process at temperatures up to 350°C and comes with a range of process connections for applications from mining to offshore applications.

It is fitted with a Ceraphire ceramic cell for low pressure applications from full vacuum to 40 bar. The 99.9% Al2O3 purity of Ceraphire makes it resistant to mechanical abrasion and damage and chemically inert. The material is up to 30 times thicker than metal membranes, oil-free and can be used in applications up to 150°C.

For high-pressure applications up to 700 bar, the Cerabar-S incorporates a mono-silicone cell with stainless steel diaphragm which can withstand temperatures up to 180°C. This version tolerates temperatures of up to 280°C without the need for chemical seals. In the absence of fill fluid, the measured value cannot be affected by temperature changes. Chemical seals are available for applications up to 350°C. Accuracy is now 0.05% of the measured variable, and stability is 0.05% of the upper range limit/year. All internationally accepted Ex approvals are available ATEX, FM, CSA and IEC.

Cerabar-S incorporates a HistoROM/M-DAT, a chip that stores a wide range of data including the last 25 hours of process variables including temperature, pressure and the configuration settings of the transmitter, and event recording (with electronic signatures). This enables fast trouble-shooting and retrospective analysis in the event of a problem. It also allows the device to be readily transferred from one process to another together with relevant calibration data.

The housing has been designed to satisfy safety demands for process measuring devices including SIL2 and PED requirements and all initially accepted Ex ratings, including IEC Ex. A die-cast, powder-coated aluminium housing is available for chemically aggressive environments such as mining and power generation. A stainless steel housing is also available for food applications and highly aggressive environments such as those involving sea air or chlorine atmospheres. Both versions feature secondary containment design, in which the sensor compartment is mechanically separated from the electronics compartment in order to eliminate the possibility of harm to the operators in the event of a process accident.

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