Multivariable transmitter gets redesign
An
Invensys Foxboro product story
Edited by the Engineeringtalk editorial team
Dec 7, 2005
Invensys redesigns Foxboro IMV25 multivariable transmitter for natural gas flow rate measurement applications that need pressure, differential pressure and process temperature measurements.
Invensys Process Systems has redesigned the Foxboro IMV25 multivariable transmitter for optimum natural gas flow rate measurement and other natural gas applications that rely on accurate measurement of pressure, differential pressure and process temperature.
The IMV25 is available with Modbus digital communications for remote monitoring, configuration and calibration.
The process interface structure allows flexible installation.
The redesign has extended measurement ranges.
It lets users replace separate static pressure, differential pressure and temperature transmitters with one transmitter that digitally communicates all three measurements to the user's system.
It allows remote monitoring, configuration, and calibration.
The Modbus version communicates with host processors using the Modbus RTU mode through a two-wire RS485 multidrop serial connection, which provides high data throughput at common baud rates.
It is also available with Hart and Foxcom communications, as well as an assignable 4 to 20mA output signal.
A configurator software package, Model PCMM, has also been introduced to provide transmitter setup.
Communications are through a serial or USB-to-RS485 converter.
A common process connection technique for natural gas flow measurement is to mount transmitters directly to a three- or five-valve manifold assembly that is supported by the process piping.
To make this direct mounting easier, a Low ProfileT structure has been added to the IMV25.
The structure uses a compact sensor body to reduce the overall height of the transmitter and to allow use of process covers with process connections facing downward.
This lets customers use a common installation design for CoplanarT and Foxboro Low Profile transmitters.
Low Profile transmitters are available with three or five-valve manifolds and an optional adapter plate to allow installation directly onto existing Coplanar manifolds.
The IMV25 is configurable for DP spans as high as 210kPa and AP spans as high as 36.5MPa.
To better handle small span applications, a 2.5kPa maximum DP span sensor has been added to the line.
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