Liquiline CM442-CM444-CM448

Summary

Product Identification

• Product Line: Liquiline
• Models: CM442, CM444, CM448
• Type: Multiparameter transmitter with up to eight measuring channels based on digital Memosens technology.
• Document: TI00444C/07/EN/27.24-00, Version 2024-08-01

Application

The Liquiline CM442/CM444/CM448 is designed for monitoring and controlling processes in various industrial and environmental sectors, including:

• Water and wastewater
• Power stations
• Chemical industry
• Other industrial applications

Key Features and Benefits

• Flexibility:
  • Connects up to 8 Memosens sensors.
  • Supports mathematics functions for calculating new measured values.
  • Offers digital fieldbuses (HART, PROFIBUS, Modbus, Ethernet/IP, PROFINET) and an integrated web server.
  • Provides choice of cleaning function, controller, and alarm relay.
  • Optional digital or analog inputs/outputs.
• Process Safety: Standardized operating concept across the Liquiline, sampler, and analyzer platform.
• Commissioning: Fast commissioning due to Memosens technology (lab-calibrated sensors, hot plug-and-play) and preconfigured transmitters.
• Adaptability: Easy extension and adaptation capabilities.
• Inventory Management: Cross-platform, modular concept with identical modules regardless of parameters.
• Asset Management: Integration into FieldCare and W@M.

Measuring System

A complete measuring system typically includes:

• Liquiline transmitter
• Sensors with Memosens technology
• Assemblies suited to the sensors
• Optional post retainer or railing
• Optional weather protection cover

Examples of measuring systems are provided for pH, ORP, conductivity, oxygen, nitrate, SAC, turbidity, interface measurement, and disinfection.

Equipment Architecture & Modules

The transmitter architecture is modular, allowing for flexibility in configuration. Modules are assigned to slots in ascending order.

• Basic Module: Always present, occupies slots 0 and 1.
• Optional Modules: Fieldbus (e.g., 485DP, 485MB), Memosens input (2DS), Digital Input/Output (DIO), Analog Input (2AI), Analog Output (4AO, 2AO), Relay (AOR, 4R, 2R).
• Hardware Upgrades: Specific rules apply for upgrading, with limitations on the number and type of modules.
• Module Assignment: Modules are assigned sequentially. Modules with 4 ports are connected before those with 2 ports of the same type.

Communication Protocols

• HART
• PROFIBUS DP (Profile 3.02)
• Modbus TCP or RS485
• PROFINET
• EtherNet/IP

Only one fieldbus communication type can be active at a time.

Dependability & Reliability

• Memosens Technology: Enhances safety and reliability through non-contact digital signal transmission, watertight design, and lab calibration capability.
• Heartbeat Diagnostics: Provides graphical indicators for device and sensor health, along with maintenance or calibration timers.
• Heartbeat Monitoring: Transmits sensor data (hours of operation, temperature exposure, sterilizations, etc.) for predictive maintenance.
• Heartbeat Verification: Allows for process verification without interruption.
• Sensor Check System (SCS): Monitors pH glass impedance for glass breakage or sensor issues.
• Process Check System (PCS): Checks for stagnation in the measuring signal.
• Self-monitoring: Includes overcurrent detection for current inputs, board voltage monitoring, and board temperature measurement.
• USP and EP Compliance: Implemented limit functions for conductivity measurements in pharmaceutical water (WFI, HPW, PW).
• ChemocleanPlus: Freely programmable sequence control for automatic sensor cleaning.

Ease of Maintenance

• Modular Design: Facilitates easy adaptation, retrofitting of extension modules, and upgrades.
• Data Logger Function: Stores various logbooks (measured values, calibration, hardware, version, operation, diagnostics) with adjustable scan times and large entry capacities.
• SD Card: Enables software updates, data storage, configuration transfer, and screenshot saving.
• External Signals: Digital inputs and outputs can be used for device control, measuring range switching, triggering cleaning, and more.
• FieldCare & Field Data Manager: Software for configuration, asset management, and data visualization.
• Virtual Process Values: Up to 8 calculated "virtual" process values can be created using mathematical functions.
• Concentration Tables: Factory-set and user-defined tables are available for converting inductive conductivity measurements to substance concentrations.

Safety Features

• Real-time Clock: Buffered by a battery for accurate time-stamping.
• Data Security: Settings and logbooks are stored in non-volatile memory.
• Measuring Range Switching: Can be used for CIP processes and phase separation monitoring.
• Measured Value Compensation: For oxygen and conductivity, with options for pressure, temperature, or external sensor inputs.
• Password Protection: For local and remote operation.
• Process Safety: Two independent PID controllers for one- or two-sided control.
• IT Security: Built-in mechanisms to protect against inadvertent setting changes.

Input Specifications

• Measured Variables: Refer to connected sensor documentation.
• Measuring Ranges: Refer to connected sensor documentation.
• Types of Input:
  • Digital sensor inputs (Memosens protocol)
  • Analog current inputs (optional, 0/4 to 20 mA, passive)
  • Digital inputs (optional, 0 to 30 V)
  • Intrinsically safe digital sensor inputs (Memosens protocol, Ex approval)
• Input Signal: Max. 8 binary sensor signals (or 6 with 2DS Ex-i module), optional 2 x 0/4 to 20 mA, 0 to 30 V.
• Cable Specification: Memosens data cable CYK10 or sensor fixed cable. Max. 100 m length.
• Digital Inputs (Passive): Span High (11 to 30 V DC), Low (0 to 5 V DC).
• Current Inputs (Passive): Span > 0 to 20 mA, linear characteristic.

Output Specifications

• Output Signal: 2, 4, 6, or 8 x 0/4 to 20 mA (active, galvanically isolated).
• HART Communication: Optional, via current output 1:1.
• PROFIBUS DP/RS485: EIA/TIA-485, multiple data transmission rates.
• Modbus RS485: EIA/TIA-485, multiple baud rates.
• Ethernet and Modbus TCP: IEEE 802.3, 10/100 MBd.
• Ethernet/IP: IEEE 802.3, 10/100 MBd.
• PROFINET: IEEE 802.3, 100 MBd.
• Signal on Alarm: Adjustable as per NAMUR Recommendation NE 43.
• Load (Current Outputs): Max. 500 Ω.
• Digital Outputs (Passive): Open collector, max. 30 V, 15 mA.
• Auxiliary Voltage: Unregulated, 24 V DC, max. 50 mA.

Environmental Conditions

• Ambient Temperature: See official PDF for exact tabulated values.
• Storage Temperature: See official PDF for exact tabulated values.
• Relative Humidity: See official PDF for exact tabulated values.
• Degree of Protection: See official PDF for exact tabulated values.
• Vibration Resistance: See official PDF for exact tabulated values.
• Electromagnetic Compatibility: See official PDF for exact tabulated values.

Mechanical Construction

• Dimensions: See official PDF for exact tabulated values.
• Weight: See official PDF for exact tabulated values.
• Materials: See official PDF for exact tabulated values.

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Disclaimer: This summary is based on extracted text and may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror