Monday 9 July 2012

Multichannel transmitter!

The Liquiline CM444 & CM448 from Endress + Hauser are multichannel transmitters for monitoring and controlling processes in water & wastewater, chemical, power and other industries.

Liquiline CM444 and CM448 accept inputs from up to eight Endress+Hauser Memosens digital sensors including nitrate, spectral absorption coefficient (SAC), pH, ORP, conductivity, dissolved oxygen, turbidity, free-chlorine and ion selective electrode sensors.  Mix and match as needed – the device recognizes any combination of Memosens sensors and starts operating immediately.  Memosens technology means all sensors can be precalibrated in the laboratory.  When connected to the Liquiline series of transmitters - sensors are recognized automatically.  This makes the exchange of sensors fast and maximizes the uptime of the measuring point.

They can be field-upgraded at any time to accept additional inputs simply by plugging in additional modules. Optional current inputs are available for processing signals from other process devices such as flow, level or pressure sensors.

Outputs include up to eight 4-20mA current outputs with HART; as well as Ethernet, Profibus, and Modbus TCP or 485 networks. An integrated web server provides remote access via any web browser.

Additional outputs include up to four relay outputs capable of switching 24, 115 or 230Vac. The relay outputs can be used to sound alarms, start or stop cleaning functions, activate a controller, or perform other related functions.

The web server connects to the Internet via the CM444 or CM448 transmitter’s Ethernet TCP port. Using any web browser, users can perform remote configuration or access to device parameters.

Virtual Process Values
In addition to actual process values provided by the sensors or analog inputs, mathematical functions can be used to calculate a maximum of six "virtual" process values. The following mathematical functions are possible:

• pH calculation based on two conductivity values, often used in boiler feed water and similar applications
• Difference between two measured values from different sources, such as for membrane monitoring
• Differential conductivity to monitor the efficiency of ion exchangers
• Degassed conductivity for process control in power plants
• Redundancy for monitoring two or three measuring sensors.
• rH calculation based on the measured values of pH and ORP sensors.

The virtual process values can be:
• Output via a current output or one of the digital network
• Used as a regulating control variable
• Assigned as a measured variable to a limit contactor activated by one of the unit’s relay outputs
• Used as a measured variable to trigger cleaning
• Displayed in user-defined menus.

The CM444 & CM448 have a back-lit graphic display that alerts users to errors and displays load curves. It also has drop-down menus for monitoring values, and displays outputs from the built-in data logger. The data logger can maintain up to eight separate data logbooks, with 150,000 entries per logbook. The data logger has an adjustable scan time of one second to six hours, and a logbook that keeps track of up to 75 calibrations.

Device configuration, diagnostics and maintenance asset functions can be accomplished with Endress+Hauser’s FieldCare software. FieldCare, based on FDT/DTM technology, can connect to either via a service interface or HART.

They both have rugged plastic IP66/67 housing that is leak proof and corrosion-resistant, making it ideal for use in non-hazardous applications in water & wastewater, oil & gas, chemical and power industrie

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