Deltabar FMD71 level transmitter

The FMD71 level transmitter uses a two pressure sensor modules measuring the hydrostatic pressure and the head pressure eliminating impulse lines or capillaries.

06/03/2014


Endress+Hauser introduces the Deltabar FMD71 level transmitter, which uses two pressure sensor modules, each connected electronically to a single transmitter. Using a Ceraphire ceramic sensor in the pressure sensor modules, the transmitter calculates the differential pressure from both sensors and transmits the level, volume or mass via 4-20 mA with HART as a standard two-wire loop-powered device.

One sensor module measures the hydrostatic pressure (HP) and the other one the head pressure (LP). Each sensor sends a digital signal corresponding to temperature compensated measured pressure to the transmitter. This electronic system eliminates issues of traditional differential pressure measurements by doing away with impulse lines or capillaries and their related issues of icing, clogging, leaks, condensation and changing ambient temperatures.  

The sensors connect to the transmitter module via industry standard, color-coded twisted pair cable and have NEMA 4X/6P (IP66/IP68) watertight housings and connections. The transmitter can be located away from the sensors in areas safe and convenient for personnel. The system meets ATEX, IEC Ex, CSA and FM specifications for use in hazardous areas including Zones 0, 1 and 2; and Division 1 and 2.

The Ceraphire ceramic cell is vacuum, corrosion and abrasion resistant, eliminating traditional mechanical issues with corrosive and abrasive media.The Ceraphire ceramic cell can be used in absolute vacuum and has excellent chemical resistance properties, similar to Alloy C. 

For applications where heavy environmental wash-down is a concern, the FMD71 automatically incorporates Endress+Hauser’s dehydration module when a hygienic process connection is utilized. The dehydration module draws moisture from the ambient air inside the cell before it affects the sensor.

The FMD71 offers a standard 4-20mA HART capable output. The dP level measurement is the default 4-20mA signal while dP level, head pressure and sensor temperature can all be assigned as HART variables. Each sensor in the FMD71 system has 0.075% reference accuracy, maximum nominal pressure measurement of -15 to 600 psig, and a -40°F to 302°F process temperature capability. 

The system has built-in diagnostics for continuous health indication via HART. Operators can access HART data via Endress+Hauser’s FieldCare software or Field Xpert PDA.

Endress+Hauser

www.us.endress.com/en

-Edited by CFE Media



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