E+H Liquiline M CM42 Transmitter

Fits hazardous-area and two-wire liquid analysis loops that need a Liquiline M CM42 transmitter for Memosens/analog pH/ORP, oxygen, or inductive/conductive conductivity with HART, PROFIBUS PA, or FOUNDATION Fieldbus.

Key advantages

Two-wire analytical transmitter — Loop-powered Liquiline M for Memosens/analog pH/ORP, O₂, conductivity.
HART / PA / FF — Passive current with optional HART; PROFIBUS PA; FOUNDATION Fieldbus.
Ex-capable builds — Ex ib / nA / Div 1&2 versions by order code; plastic or SST hygienic housing.
IP66/67 / NEMA 4X — Graphic navigator display; ambient non-Ex −30…70 °C class.

Typical applications

Hazardous-area liquid analysis loops that must stay two-wire.
Single-parameter pH/ORP/O₂/conductivity points on Liquiline M architecture.
Hygienic SST housing installs versus plastic field housings.

Selection guide

Role — Two-wire transmitter for Memosens/analog pH/ORP, oxygen, inductive/conductive conductivity (ranges per connected sensor).
Accuracy — Depends on connected sensor; TI gives I/O and Ex parameter tables.
Output / communication — Passive current output(s) with optional HART; PROFIBUS PA; FOUNDATION Fieldbus.
Supply — Loop-powered two-wire; current/HART ~12.5…30 V class (see TI load graph); fieldbus 9…32 V DC non-Ex (FISCO Ex limits apply).
Housing — Plastic PC-FR or stainless steel 1.4301 (AISI 304) hygienic version.
IP — IP66/67 (IEC 60529); NEMA Type 4X (UL 50E).
Ambient — Non-Ex −30 to 70 °C (−20 to 160 °F); Ex versions typically −20…50/55 °C by T-class.
Display — Graphic display with navigator / plain-text guidance.
Hazardous area — Ex ib / nA / Div 1&2 versions per order code.
Weight — Plastic ~1.5 kg; stainless ~2.1 kg.
Approvals — ATEX; IECEx; CSA; FM; NEPSI; Japan-Ex; EAC Ex; CE.
Notes — Transmitter-only. Specs from TI00381C/07/EN/17.25-00.

Common mistakes

Confusing CM42 (two-wire Ex-capable) with multiparameter CM44x panel transmitters — different power and channel architecture.
Leaving housing blank — plastic PC-FR vs stainless hygienic changes weight (~1.5 vs ~2.1 kg) and washdown fit.
Ignoring Ex ambient derating (−20…50/55 °C by T-class) versus non-Ex −30…70 °C.
Ordering without sensor type (pH/ORP / O2 / conductivity) and Memosens vs analog.
Expecting process wetted parts on the transmitter SKU — transmitter-only .

When to RFQ / what to tell us

Measured parameter (pH/ORP / oxygen / conductivity), Memosens vs analog, and sensor model.
Protocol (HART / PA / FF), Ex code, housing (plastic vs stainless).
Quantity, ship-to, and any hygienic marks needed.

Request a Quote · Get selection help

Specs

Spec	Value
SKU	47567
Brand	Endress+Hauser
Model	Liquiline M CM42
Product type	analytical_transmitter
Measuring range	Two-wire transmitter for Memosens/analog pH/ORP, oxygen, inductive/conductive conductivity (ranges per connected sensor)
Accuracy	Depends on connected sensor; TI gives I/O and Ex parameter tables
Output / communication	Passive current output(s) with optional HART; PROFIBUS PA; FOUNDATION Fieldbus
Supply	Loop-powered two-wire; current/HART ~12.5…30 V class; fieldbus 9…32 V DC non-Ex (FISCO Ex limits apply)
Housing	Plastic PC-FR or stainless steel 1.4301 (AISI 304) hygienic version
IP rating	IP66/67 (IEC 60529); NEMA Type 4X (UL 50E)
Ambient temperature	Non-Ex −30 to 70 °C; Ex versions typically −20…50/55 °C by T-class
Display	Graphic display with navigator / plain-text guidance
Hazardous area	Ex ib / nA / Div 1&2 versions per order code
Weight	Plastic ~1.5 kg; stainless ~2.1 kg
Approvals	ATEX; IECEx; CSA; FM; NEPSI; Japan-Ex; EAC Ex; CE
Notes	Transmitter-only. Specs from TI00381C/07/EN/17.25-00 (2025-06-30).

Documents

Endress+Hauser Liquiline M CM42 datasheet (PDF)

FAQ

Q: Is CM42 loop-powered? A: Yes — two-wire loop-powered — confirm load graph and Ex limits for your barrier.

Q: CM42 vs CM444? A: CM42 is two-wire Ex-capable single-parameter class; CM444 is multiparameter (up to 4 Memosens) with AC/DC supply options.

Q: What should I send for a quote? A: Parameter, sensor, protocol, Ex/housing, quantity. Compatible with systems using Endress+Hauser Liquiline M CM42 — we do not claim authorized-dealer status.