Endress+Hauser CPS71D-7TB21 – High-Accuracy Capacitive Pressure Measurement | Cerabar S Platform
Engineering Background: The Cerabar S series represents Endress+Hauser’s flagship absolute and gauge pressure transmitter platform, engineered for demanding process environments where measurement accuracy, long-term stability, and hygienic compliance are non-negotiable. The CPS71D-7TB21 is a fully configured variant within this series, combining a ceramic capacitive sensing cell with advanced signal conditioning electronics.
Product Positioning: Designed for procurement engineers and system integrators sourcing a proven, SIL-capable pressure transmitter for chemical, food & beverage, pharmaceutical, and water treatment applications. The CPS71D-7TB21 delivers ±0.075% accuracy with a robust all-ceramic wetted surface — eliminating oil-fill concerns in hygienic and high-purity processes.
Complete Technical Specifications
- Manufacturer: Endress+Hauser
- Model / SKU: CPS71D-7TB21
- Series / Platform: Cerabar S
- Measurement Type: Absolute & Gauge Pressure (capacitive ceramic cell)
- Measuring Range: –1 to 400 bar (configurable per order code)
- Accuracy: ±0.075% of span (reference conditions)
- Long-Term Stability: ≤0.1% per year
- Process Temperature: –40 to +150 °C (–40 to +302 °F)
- Ambient Temperature: –40 to +85 °C
- Wetted Materials: Al₂O₃ 99.9% ceramic diaphragm; PTFE seal
- Process Connection: G½ / ½ NPT (per variant suffix)
- Output Signal: 4–20 mA HART (2-wire)
- Supply Voltage: 10.5–45 V DC
- Ingress Protection: IP66/IP67 / NEMA 4X
- Explosion Protection: ATEX, IECEx, FM, CSA (Ex ia / Ex d)
- SIL Rating: SIL 2 (IEC 61508) — suitable for safety-instrumented systems
- Display: Optional local LCD with 4-line display
- Housing Material: Aluminium / Stainless Steel 316L
- Weight: Approx. 1.6 kg
- Certifications: CE, ATEX, IECEx, 3-A Sanitary, EHEDG
Proven Application Environments
- Chemical & Petrochemical: Reactor vessel pressure monitoring, column differential pressure, pump protection — ceramic cell withstands aggressive media without oil-fill contamination risk.
- Food & Beverage / Dairy: CIP/SIP-compatible hygienic pressure measurement in tanks, pipelines, and pasteurizers. 3-A and EHEDG certified for direct product contact.
- Pharmaceutical & Biotech: Sterile process pressure control in bioreactors and clean-in-place systems. Smooth ceramic surface prevents bacterial adhesion.
- Water & Wastewater Treatment: Filter differential pressure, pump station monitoring, and dosing system control — IP67 housing handles outdoor and wet environments.
- Oil & Gas Upstream: Wellhead and separator pressure measurement in SIL 2 safety loops. ATEX/IECEx certified for Zone 1/Zone 2 hazardous areas.
- Power Generation: Boiler feed water pressure, steam header monitoring, and cooling water system control.
Engineering Advantages
- Oil-Free Ceramic Cell: Eliminates process contamination risk — critical for hygienic and high-purity applications where oil-filled diaphragm sensors are prohibited.
- ±0.075% Reference Accuracy: Exceeds typical ±0.1% class transmitters; reduces calibration frequency and improves process yield.
- HART 7 Protocol: Full digital communication for remote configuration, diagnostics, and integration with asset management systems (AMS, PACTware, FieldCare).
- SIL 2 Certified: Pre-validated for use in IEC 61511 safety-instrumented functions — reduces SIL verification engineering effort.
- Heartbeat Technology: Continuous self-monitoring with on-demand verification without process interruption — supports predictive maintenance strategies.
- Modular Housing: Field-rotatable display and conduit entry; simplifies installation in confined spaces and reduces commissioning time.
System Architecture & Signal Flow
The CPS71D-7TB21 operates as a 2-wire 4–20 mA loop-powered transmitter. The ceramic capacitive cell converts process pressure into a differential capacitance signal, which is processed by the integrated ASIC and linearized to a 4–20 mA output proportional to the configured measuring range. HART communication is superimposed on the 4–20 mA loop, enabling simultaneous analog control and digital diagnostics.
Typical wiring topology: Field transmitter → cable gland (M20×1.5 or ½ NPT conduit) → marshalling cabinet terminal → DCS/PLC analog input card (e.g., Siemens S7-1500 AI module, Rockwell 1756-IF16). HART handheld (e.g., Emerson 475) or HART modem connects in parallel for configuration and diagnostics.
Power supply requirement: 24 V DC loop supply with minimum 250 Ω HART load resistance in series for HART communication.
Sourcing & Quality Verification
- All units sourced from authorized Endress+Hauser distribution channels or verified surplus with full traceability documentation.
- Each unit inspected for physical integrity, nameplate legibility, and serial number verification against E+H production records where applicable.
- Calibration certificates and factory acceptance test (FAT) reports available upon request.
- Packaging inspected for moisture ingress, seal integrity, and original factory labeling.
- Konmask.com maintains ISO-aligned incoming inspection procedures for all instrumentation inventory.
Procurement Process
- Step 1 — Inquiry: Submit your RFQ via the product page or email support@konmask.com with quantity, required delivery date, and any documentation requirements (CoC, calibration cert, datasheet).
- Step 2 — Quotation: Receive a formal quotation within 1 business day including unit price, lead time, and shipping options (DHL Express, FedEx, sea freight).
- Step 3 — Order Confirmation: Purchase order accepted via email or Shopify checkout. Payment terms: T/T, PayPal, or credit card.
- Step 4 — Dispatch: Units shipped with commercial invoice, packing list, and available technical documentation. Export-compliant packaging for international shipments.
- Step 5 — After-Sales: Technical support available for installation, configuration, and HART commissioning queries.
Technical FAQ
Q: What is the difference between CPS71D and CPM223 in the Cerabar S family?
A: The CPS71D uses a ceramic capacitive cell (oil-free, hygienic), while the CPM223 uses a metallic measuring cell with oil fill — suited for higher-pressure ranges and non-hygienic industrial processes.
Q: Is the CPS71D-7TB21 compatible with PROFIBUS PA or Foundation Fieldbus?
A: The 7TB21 order code specifies HART output. Separate order codes exist for PROFIBUS PA (suffix 7PB) and Foundation Fieldbus (suffix 7FF). Confirm your bus topology before ordering.
Q: Can this transmitter be used in SIL 2 safety loops without additional hardware?
A: Yes. The CPS71D is SIL 2 capable per IEC 61508 in single-device use (HFT=0). A Safety Manual (available from E+H) must be followed during installation and proof-test planning.
Q: What is the maximum process temperature for CIP/SIP cycles?
A: The ceramic cell withstands up to +150 °C process temperature. Standard SIP cycles at 121–134 °C are fully supported. Consult the datasheet for thermal shock limits.
Q: How do I configure the measuring range on-site?
A: Via HART handheld communicator, FieldCare/DeviceCare software, or the optional local display with push-button interface. No tools required for basic range adjustment.
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