Endress+Hauser CM442-3PQ7/0 – Universal Signal Converter | Liquiline Platform
Engineering Background
The Endress+Hauser Liquiline platform represents over two decades of field-proven innovation in process analytics. Designed for demanding industrial environments, the CM442 series delivers unmatched flexibility for multi-parameter liquid analysis across water treatment, chemical processing, food & beverage, and pharmaceutical applications.
Product Positioning
The CM442-3PQ7/0 is a 2-channel universal signal converter engineered for procurement engineers who require a single, scalable platform capable of handling pH, ORP, conductivity, dissolved oxygen, turbidity, and more — without replacing hardware when process requirements evolve. It is the preferred choice for facilities standardizing on a unified transmitter architecture.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Model / SKU | CM442-3PQ7/0 |
| Platform | Liquiline CM442 |
| Manufacturer | Endress+Hauser |
| Channels | 2 (expandable via plug-in modules) |
| Sensor Inputs | pH/ORP, Conductivity (inductive/conductive), Dissolved O₂, Turbidity, Chlorine, ISE, Nitrate |
| Analog Outputs | 2 × 4–20 mA (HART optional) |
| Digital Communication | PROFIBUS DP, Modbus RS485, EtherNet/IP (module-dependent) |
| Relay Outputs | 2 × SPDT (expandable) |
| Display | Graphic LCD, backlit, 4-line |
| Enclosure Rating | IP66 / IP67 / NEMA 4X |
| Ambient Temperature | -20 °C to +60 °C (-4 °F to +140 °F) |
| Power Supply | 100–230 V AC ±15%, 50/60 Hz |
| Power Consumption | Max. 35 W |
| Housing Material | Polycarbonate / Stainless Steel front |
| Mounting | Panel, wall, or pipe mounting (DIN rail adapter available) |
| Weight | Approx. 2.5 kg |
| Approvals | CE, UL, cUL, ATEX (zone-dependent modules) |
| Country of Origin | Germany |
Proven Application Environments
- Municipal Water & Wastewater Treatment — continuous monitoring of pH, conductivity, and dissolved oxygen in aeration basins and effluent streams
- Chemical & Petrochemical Plants — corrosion-resistant design handles aggressive media; supports ATEX-rated sensor modules
- Food & Beverage / CIP Processes — hygienic sensor compatibility; conductivity monitoring for clean-in-place validation
- Pharmaceutical & Biotech — USP/EP purified water monitoring; 21 CFR Part 11 audit trail support via Memosens protocol
- Power Generation — boiler feedwater and cooling tower chemistry control
- Semiconductor Fabrication — ultra-pure water resistivity and TOC monitoring
Engineering Advantages
- Modular Architecture — plug-in I/O and sensor modules allow field upgrades without rewiring or replacing the base unit
- Memosens Digital Sensor Protocol — inductive, non-contact data transfer; sensor calibration data stored on-chip; eliminates moisture-related signal errors
- Dual-Channel Simultaneous Measurement — reduces hardware footprint and installation cost by 40–60% vs. single-channel alternatives
- Integrated Diagnostics (NAMUR NE 107) — real-time sensor health status with standardized failure, maintenance, out-of-spec, and function-check signals
- Fieldbus Integration — native PROFIBUS DP and Modbus RTU support; optional EtherNet/IP for Industry 4.0 DCS/SCADA integration
- Guided Calibration Wizard — on-screen step-by-step calibration reduces technician training time and calibration errors
System Architecture & Signal Flow
The CM442-3PQ7/0 accepts Memosens digital sensors or conventional analog sensors via the appropriate input module. Sensor signals are processed by the dual-channel CPU, linearized, and output simultaneously via:
- 4–20 mA analog loops to PLC/DCS analog input cards
- HART overlay for asset management systems (AMS, PACTware)
- RS485 Modbus RTU or PROFIBUS DP to fieldbus networks
- Relay contacts for limit alarms and dosing control
The modular backplane supports up to 4 additional I/O modules, enabling expansion to 4 sensor channels, additional analog outputs, or digital fieldbus cards — all without changing the field wiring.
Sourcing & Quality Verification
- All units sourced directly from Endress+Hauser authorized distribution channels or verified surplus inventory with full traceability
- Each unit inspected for: intact factory seals, valid serial number traceable to E+H production records, firmware version verification, and functional power-on test
- Certificate of conformity and original factory documentation available upon request
- Konmask.com maintains ISO-aligned incoming inspection procedures for all automation hardware
Procurement Process
- Step 1 — Inquiry: Submit your BOM or part number to [email protected] or via the product page inquiry form
- Step 2 — Quote: Receive a formal quotation with lead time, unit price, and shipping options within 24 business hours
- Step 3 — Order Confirmation: Purchase order accepted via email; proforma invoice issued for prepayment or net terms (qualified accounts)
- Step 4 — Inspection & Dispatch: Unit inspected, photographed, and securely packaged; tracking number provided within 1 business day of payment clearance
- Step 5 — After-Sales Support: Technical support available for installation, commissioning, and parameter configuration queries
Technical FAQ
Q: Is the CM442-3PQ7/0 compatible with non-Memosens (analog) sensors?
A: Yes. With the appropriate analog input module installed, the CM442 accepts conventional 4-wire pH/ORP and conductivity sensors. Memosens modules are required for digital sensor connectivity.
Q: Can the firmware be updated in the field?
A: Yes. Firmware updates are performed via SD card or USB interface without removing the unit from service. Contact Endress+Hauser or Konmask support for the latest firmware package.
Q: What is the difference between CM442 and CM444?
A: The CM444 supports up to 4 sensor channels natively; the CM442 supports 2 channels with expansion to 4 via plug-in modules. For applications requiring more than 4 channels, the CM448 (8-channel) is recommended.
Q: Is ATEX certification available for this model?
A: The base CM442 unit is not ATEX-rated. ATEX-compliant sensor modules and Zener barriers can be used with the CM442 for Zone 1/2 installations. Consult the E+H product configurator for the correct ATEX module ordering code.
Q: What warranty applies to units purchased through Konmask?
A: All units carry a 90-day Konmask functional warranty covering power-on operation and signal output integrity. Extended warranty options are available upon request.
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