E+H portfolio illustration from our resource library; not a configuration-specific CM42 product photograph.

The family name is only the first line of the RFQ

Liquiline M CM42 is a modular two-wire transmitter for liquid analysis. The family covers pH/ORP, conductivity and oxygen applications through suitable versions. Purchasing a unit simply described as “CM42” can leave crucial questions unanswered: which sensor input, which output, which housing and which approval?

CM42 family capabilities to confirm

These are family options. They are not all installed on every CM42. Where hazardous-area service is required, match the precise certificate and installation requirements to the ordered device.

A replacement has three interfaces to match

Sensor side: identify the actual probe and whether it uses Memosens or an analog connection. A shared brand does not establish compatibility across parameters and generations.

Control-system side: check whether the existing point uses an analog loop, HART or a fieldbus. Two current outputs do not create two independent sensor channels. The required interface and available loop power should be reviewed with the selected version's wiring documentation.

Installation side: record housing material, mounting arrangement, cable entries and any area approval. Include the enclosure location and cleaning exposure. These details help avoid an apparently suitable unit arriving with an unsuitable mechanical or approval configuration.

CM42 and CM42B need an explicit comparison

CM42 and CM42B are separately identified product families in manufacturer documentation. If an alternative is proposed, request a written comparison covering sensor compatibility, communication, mounting, approvals and commissioning. A similar product name alone is not proof of a drop-in replacement.

Send a complete CM42 quotation request

1. Complete CM42 order code and extended code, if shown, with quantity and destination.

2. Sensor model, measuring parameter and required operating range.

3. Existing output or fieldbus, loop supply details and relevant wiring information.

4. Housing, mounting, cable-entry and approval requirements.

5. Supply scope: transmitter only, sensor/cable or a complete measuring point.

6. Required delivery date and documentation needed for acceptance.

For a replacement, attach the existing nameplate and available installation records. For a new point, provide the application requirements. Ask for confirmation of available quantity, exact configuration and dispatch timing before scheduling installation.

CM42 buying questions

Can any CM42 measure every listed parameter?

No. The selected input module, sensor and ordered version determine the supported measuring task. Confirm the complete configuration.

Is CM42 a two-channel transmitter?

The manufacturer identifies it as a one-channel platform. An optional second current output is different from a second measuring channel.

Is the probe included in a CM42 quotation?

Only when explicitly listed. Define the transmitter, sensor, cable and accessories separately in the supply scope.

How can I request CM42 stock and price?

Send the complete order code, quantity, sensor reference, destination and required interface to the contact below.

Also sourcing E+H level instruments?

We welcome enquiries for these configured references as well. Include the complete model in every request so the correct item can be checked.

Technical reference: Endress+Hauser Liquiline M CM42. Confirm the ordered configuration against current manufacturer documentation.