---
title: "Endress+Hauser Liquiline™ CM442 Multiparameter Field Transmitter"
description: "Extensible 1- to 2-channel liquid analysis field transmitter using Memosens digital protocol to auto-detect and monitor up to 12 parameters."
canonical_url: "https://nodewave.net/store/transmitters/liquiline-cm442"
last_updated: "2026-10-04T04:05:07.158Z"
---

<note>

The Liquiline CM442 features non-contact digital **Memosens technology**. Sensor calibration data is stored inside the
sensor head itself, allowing pre-calibration in the lab before rapid plug-and-play installation in field operations
without re-calibrating at the transmitter.

</note>

## Executive Summary & Core Capabilities

The **Endress+Hauser Liquiline™ CM442** is an extensible 1- to 2-channel field transmitter designed for continuous
liquid analysis across all process industries. Powered by non-contact inductively coupled **Memosens digital
technology**, the CM442 automatically identifies connected sensors, loads calibration parameters, and initiates
measurement immediately.

<callout color="green" icon="i-lucide-layers">

**Modular Architecture:** The CM442 basic platform includes 2 Memosens inputs and 2 current outputs. Additional plug-in
extension modules allow field engineers to scale current outputs up to 8, add relay channels, or integrate industrial
fieldbus protocols without replacing the transmitter base.

</callout>

<accordion>
<accordion-item icon="i-lucide-sparkles" label="Non-Technical Overview">

- **Plug & Play Sensors:** Connect any Memosens liquid analysis sensor and the controller auto-configures instantly
without manual programming.
- **Pre-Calibrated Lab Swaps:** Sensors can be calibrated in a laboratory, then carried into the field and swapped in
seconds without stopping transmitter power.
- **Weatherproof Enclosure:** Outdoor-ready IP66/IP67 enclosure built to handle rain, dust, and temperature swings in
harsh plant environments.

</accordion-item>

<accordion-item icon="i-lucide-cpu" label="Technical Deep-Dive">

The Liquiline CM442 4-wire controller manages 1 or 2 Memosens channels concurrently. It converts sensor signals
inductively at the sensor head, eliminating interference from moisture, corrosion, or ground loops.

It supports up to 12 parameters: pH, redox/ORP, ISFET, conductive/inductive conductivity, dissolved oxygen, nitrate,
turbidity, free chlorine, and sludge level. Data logging and backup configuration files are handled via an integrated SD
card reader. Communication options include PROFIBUS DP, Modbus RS485, Modbus TCP, and Ethernet.

</accordion-item>
</accordion>

---

## Technical Specifications & Performance Matrix

<tabs>
<tabs-item label="Measurement & Channels">
<table>
<thead>
  <tr>
    <th align="left">
      Parameter
    </th>
    
    <th align="left">
      Engineering Specification
    </th>
  </tr>
</thead>

<tbody>
  <tr>
    <td align="left">
      <strong>
        Memosens Inputs
      </strong>
    </td>
    
    <td align="left">
      1 or 2 digital channels (auto-detecting)
    </td>
  </tr>
  
  <tr>
    <td align="left">
      <strong>
        Supported Parameters
      </strong>
    </td>
    
    <td align="left">
      pH, ORP, ISFET, Conductivity, Dissolved Oxygen, Turbidity, Nitrate, Chlorine, Sludge Level
    </td>
  </tr>
  
  <tr>
    <td align="left">
      <strong>
        Optional Inputs
      </strong>
    </td>
    
    <td align="left">
      Up to 2x 0/4...20 mA analog inputs, 2x digital inputs
    </td>
  </tr>
  
  <tr>
    <td align="left">
      <strong>
        Calibration Storage
      </strong>
    </td>
    
    <td align="left">
      Stored inside individual Memosens sensor heads
    </td>
  </tr>
  
  <tr>
    <td align="left">
      <strong>
        Data Logging
      </strong>
    </td>
    
    <td align="left">
      SD Card slot for software updates, log storage, and setup transfer
    </td>
  </tr>
</tbody>
</table>
</tabs-item>

<tabs-item label="Outputs & Fieldbus Communication">
<table>
<thead>
  <tr>
    <th align="left">
      Output Type
    </th>
    
    <th align="left">
      Configuration Range
    </th>
  </tr>
</thead>

<tbody>
  <tr>
    <td align="left">
      <strong>
        Current Outputs
      </strong>
    </td>
    
    <td align="left">
      2 to 8x 0/4...20 mA active outputs (galvanically isolated)
    </td>
  </tr>
  
  <tr>
    <td align="left">
      <strong>
        Relay Contacts
      </strong>
    </td>
    
    <td align="left">
      1x Alarm relay + up to 4x auxiliary switching relays
    </td>
  </tr>
  
  <tr>
    <td align="left">
      <strong>
        Digital Fieldbus
      </strong>
    </td>
    
    <td align="left">
      PROFIBUS DP, Modbus RS485, Modbus TCP, Ethernet
    </td>
  </tr>
  
  <tr>
    <td align="left">
      <strong>
        Integrated Web Server
      </strong>
    </td>
    
    <td align="left">
      Remote parameterization and display streaming over Ethernet
    </td>
  </tr>
</tbody>
</table>
</tabs-item>

<tabs-item label="Mechanical & Operating Limits">
<table>
<thead>
  <tr>
    <th align="left">
      Compliance Metric
    </th>
    
    <th align="left">
      Specification
    </th>
  </tr>
</thead>

<tbody>
  <tr>
    <td align="left">
      <strong>
        Ingress Protection
      </strong>
    </td>
    
    <td align="left">
      IP66 / IP67 / NEMA 4X outdoor rated
    </td>
  </tr>
  
  <tr>
    <td align="left">
      <strong>
        Enclosure Material
      </strong>
    </td>
    
    <td align="left">
      Flame-retardant Polycarbonate (PC-FR)
    </td>
  </tr>
  
  <tr>
    <td align="left">
      <strong>
        Dimensions
      </strong>
    </td>
    
    <td align="left">
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    </td>
  </tr>
  
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      <strong>
        Operating Temperature
      </strong>
    </td>
    
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                </mtext>
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      </strong>
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    </td>
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</tbody>
</table>
</tabs-item>
</tabs>

---

## Wiring & Safety Instructions

<warning>

When installing intrinsically safe Memosens sensors in Zone 0 or hazardous locations, always ensure the **2DS Ex-i
module** is placed in slot 2 behind the physical separator element. Non-intrinsically safe module wiring must maintain a
minimum <span className="katex">
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</mn>

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</mtext>
</mrow>

<annotation encoding="application/x-tex">

50\text{ mm}

</annotation>
</semantics>
</math>
</span>

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<span className="base">
<span className="strut" style="height:0.6444em;">



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50

</span>

<span className="mord,text">
<span className="mord">

mm

</span>
</span>
</span>
</span>
</span>

 clearance from Ex-i terminals.

</warning>

---

## Target Industry Applications

<card-group>
<card icon="i-lucide-droplets" title="Water & Wastewater Management">

Monitors pH, dissolved oxygen, and turbidity in aeration basins, influent monitoring, and final discharge water.

</card>

<card icon="i-lucide-beaker" title="Chemical & Process Industries">

Tracks inductive conductivity, pH, and redox in corrosive chemical processes and neutralisation systems.

</card>
</card-group>

---

## Official Provider Resources & Technical Documentation

Access official Endress+Hauser technical documentation and manual downloads:

<card-group>
<card icon="i-lucide-external-link" title="Official Endress+Hauser CM442 Portal" target="_blank" to="https://www.endress.com/en/field-instruments-overview/liquid-analysis-product-overview/digital-field-transmitter-cm442">

Access official technical datasheets, order code configurators, and global approvals.

</card>

<card icon="i-lucide-file-text" title="Technical Information Manual (PDF)" target="_blank" to="https://portal.endress.com/wa001/dla/5000299/4131/000/03/TI00444CEN_1512.pdf">

Download detailed module slot assignments, wiring diagrams, and technical specifications.

</card>
</card-group>