Endress+Hauser CLM253 Modules CLM253-CD0005

Technical Dossier

Product Details And Specifications

Endress+Hauser CLM253 Series Technical Notes

The Endress+Hauser CLM253 is a two-wire conductivity transmitter engineered for continuous inline measurement in demanding process environments. Deployed across global heavy industry — including chemical plants, nuclear facilities, cooling water circuits, pharmaceutical production, and oil refinery utility systems — the CLM253 series occupies a critical position in process analytical instrumentation. Its compact DIN rail or panel-mount form factor, combined with HART communication capability and dual-limit relay outputs, made it a standard-specification instrument for distributed control system (DCS) integration throughout the 2000s and 2010s. Installed base counts in the tens of thousands across EMEA, Asia-Pacific, and North American process plants confirm its role as a backbone conductivity measurement device for conductivity ranges from 0.01 µS/cm to 500 mS/cm.

CLM253 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced variants within the CLM253 product family. Each order code encodes sensor input type, output configuration, approval class, and housing variant.

CLM253-CD0005: Two-wire HART transmitter, inductive sensor input, 4–20 mA output, standard housing, no Ex approval — the baseline catalog reference for non-hazardous area installations.
CLM253-CD0015: Two-wire HART, inductive input, 4–20 mA, ATEX Zone 1 Ex ia IIC T4 approval for gas-group hazardous areas.
CLM253-CD0025: Two-wire HART, inductive input, 4–20 mA, FM/CSA Class I Div 1 approval for North American hazardous locations.
CLM253-CD0035: Two-wire HART, inductive input, dual relay output variant, standard housing, non-Ex — used where local limit switching is required without a separate relay module.
CLM253-CE0005: Two-wire HART, conductive sensor input (0–2000 µS/cm range), 4–20 mA output, standard housing — specified for low-conductivity ultrapure water and boiler feedwater applications.
CLM253-CE0015: Conductive sensor input, ATEX Zone 1 Ex ia approval, 4–20 mA HART output — for hazardous area pure water monitoring.
CLM253-CE0025: Conductive sensor input, FM/CSA Class I Div 1, 4–20 mA HART — North American Ex-rated pure water variant.
CLM253-CF0005: Two-wire HART, inductive input, extended temperature range (-20 to +60 °C ambient), standard housing — specified for outdoor or unheated enclosure installations.
CLM253-CF0015: Extended temperature, inductive input, ATEX Zone 1 Ex ia, 4–20 mA HART.
CLM253-CG0005: Two-wire HART, inductive input, field housing (IP67 polycarbonate enclosure) — for direct pipe or wall mounting without a separate junction box.
CLM253-CG0015: Field housing, inductive input, ATEX Zone 1 Ex ia, 4–20 mA HART.
CLM253-CH0005: Two-wire HART, conductive input, field housing IP67, standard temperature, non-Ex — for outdoor conductive conductivity measurement.
CLM253-CH0015: Conductive input, field housing, ATEX Zone 1 Ex ia.
CLM253-CJ0005: Panel-mount version, inductive input, 4–20 mA HART, 96×96 mm DIN cutout — for control room or local panel integration.
CLM253-CJ0015: Panel-mount, inductive input, ATEX Zone 1 Ex ia, 4–20 mA HART — for Ex-rated panel installations in Zone 1 classified control rooms.