Liquiline Compact CM72

Summary

Product identification

• Product Name: Liquiline Compact CM72
• Type: Single-parameter transmitter for Memosens sensors
• Document Revision: TI01409C/07/EN/03.22-00

Application

The CM72 transmitter is designed for monitoring and controlling industrial and environmental processes. It supports digital Memosens sensors for the following measurements:

• pH
• ORP (Oxidation-Reduction Potential)
• Contacting conductivity
• Oxygen

Key Features and Benefits

• Space-saving design: Two-wire device that fits into assemblies, requiring no separate power supply.
• Fast commissioning: Permanent configuration allows immediate measurement startup.
• Memosens technology: Supports lab-calibrated sensors with "hot plug & play" functionality.
• Status indication: Red/green LED indicates the status of the transmitter and sensor.
• Robust: Suitable for various environmental conditions including dust, steam, rain, snow, heat, and cold.

Measuring System Components

A complete measuring system consists of:

• Liquiline compact transmitter (CM72)
• Sensors with Memosens technology
• Assemblies suitable for the sensors
• Optional junction box
• PLC (Programmable Logic Controller)

Sensor Compatibility

The CM72 transmitter is compatible with digital Memosens sensors featuring an inductive plug-in head, including:

• pH sensors
• ORP sensors
• Oxygen sensors
• Conductivity sensors

Measured Variables and Ranges

• pH: 0 to 14 pH
• ORP: -1500 mV to +1500 mV
• Conductivity:
  • 0 to 20 µS/cm
  • 0 to 500 µS/cm
  • 0 to 20 mS/cm
  • 0 to 500 mS/cm
• Oxygen:
  • 0 to 200 µg/l
  • 0 to 20 mg/l

The specific measuring range is configured according to the connected sensor type and order version.

Output Signal

• Type: 4 to 20 mA, galvanically isolated from sensor circuits.
• Linearization: Linear
• Transmission Behavior: Linear
• Resolution: < 5 µA
• Repeatability: See the documentation of the connected sensor.
• Response Time: t90 = max. 500 ms (for 0 to 20 mA current output)
• Tolerance:
  • Typical measuring tolerances: < ±20 µA (at 4 mA), < ±50 µA (for 4 to 20 mA) at 25 °C (77 °F).
  • Additional tolerance: < 1.5 µA/K.

Power Supply

• Supply Voltage:
  • 12.6 to 30 VDC (when failure current setting > 20 mA)
  • 14 to 30 VDC (when failure current setting < 4 mA)

Electrical

• Cable Length: Maximums of 3 m (10 ft), 7 m (23 ft), or 15 m (49 ft).
• Overvoltage Protection: Meets IEC 61000-4-4 and IEC 61000-4-5 with ±1 kV.
• Electrical Safety: EN 61010-1

Environmental Limits

• Ambient Temperature Range: –20 to 85 °C (–4 to 185 °F). The maximum ambient temperature depends on process temperature and installation.
  • For open installation (e.g., without protective cover): max. 60 °C (140 °F) ambient.
  • For enclosed installation (e.g., with protective cover): max. 60 °C (140 °F) ambient.
  • Process temperature: max. 100 °C (212 °F) continuous, max. 140 °C (284 °F) for < 2h (sterilization).
• Storage Temperature: -40 to +85 °C (-40 to 185 °F).
• Relative Humidity: 5 to 95 %
• Degree of Protection: IP 67, IP 68, NEMA Type 6.
• Electromagnetic Compatibility (EMC): EN 61326-1, EN 61326-2-3, NAMUR NE 21.
• Operating Height: < 2000 m (< 6562 ft) above MSL.
• Pollution Degree: Complete device: level 4; Internal: level 2.

Mechanical Construction

• Dimensions: See Diagram 6.
  • Housing: PEEK 151
  • Strain relief: EPDM
  • Axial ring: PEEK 450 G
• Impact Loads: Designed for 1 J (IK06) according to EN 61010-1.
• Weight: Approximately 42 g (1.5 oz) without cable. Weight increases with cable length.

Accessories

The Liquiline Compact CM72 supports a variety of Memosens sensors for pH, ORP, Conductivity, and Oxygen measurements. Specific sensor models include CPS11E, CPS31E, CLS15E, COS22E, and others. Software such as Memobase Plus and DeviceCare is also available.

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Disclaimer: This extraction may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror