Endress+Hauser CPS72D-7PT21 | Memosens pH/ORP Electrode, Low Ionic Strength, Pg 13.5
Endress+Hauser CPS72D-7PT21 Memosens pH/ORP electrode. Gel reference, double-junction, low ionic strength capable, Pg 13.5, for boiler feedwater & condensate.
Product Overview
The Endress+Hauser CPS72D-7PT21 is a Memosens 2.0 digital pH and redox (ORP) electrode from the CPS72D series, specially designed for measurement in low-conductivity media such as boiler feedwater, condensate, and demineralized water. It features a double-junction (dual-chamber) gel reference system with KNO₃ salt bridge, PTFE annular diaphragm, and a Pg 13.5 process connection. The sensor provides both pH (0–14) and mV (ORP) measurement with an integrated NTC 30 kΩ temperature sensor, making it the preferred choice over the standard CPS11D when measuring in high-purity or low-ionic-strength waters.
Technical Specifications (Measurement & Electrical)
| Parameter | Specification |
| Model / Order Code | CPS72D-7PT21 |
| Measuring Principle | Potentiometric (pH Glass + Redox-capable) |
| Measured Variables | pH (0…14), ORP / Redox Potential (mV) |
| Technology | Memosens 2.0 (Digital, Inductive, Galvanically Isolated) |
| Reference System | Ag/AgCl, Gel-filled, Double-Junction (KNO₃ Salt Bridge) |
| Diaphragm / Junction | PTFE Annular Gap (Ring Diaphragm) |
| Temp. Sensor | NTC 30 kΩ (Integrated) |
| Connection | Memosens Inductive Plug (C8Y) |
Technical Specifications (Mechanical & Process)
| Parameter | Specification |
| Housing Material | PPS (Ryton® / Polyethersulfone-type high-temp plastic) |
| Process Connection | Pg 13.5 (~Ø27 mm, metric fine thread) |
| Immersion Length | 120 mm (standard, without protection guard) |
| Process Temperature | 0 … +110 °C (max. +135 °C short term) |
| Process Pressure | 0.8 … 11 bar (abs) (decreases with temperature) |
| Protection Rating | IP68 (Submersible) |
| Application Class | Low Ionic Strength / Pure Water / Condensate (in addition to standard water) |
Key Features
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Optimized for Low Ionic Strength: The double-junction KNO₃ reference minimizes junction potential drift and asymmetry in demineralized water, condensate, or boiler feedwater — a key advantage over the single-junction CPS11D in pure-water applications.
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Memosens 2.0 Digital: Contactless inductive coupling prevents moisture ingress at the connector; stores calibration data, serial number, and operating hours in the sensor head for lab pre-calibration and plug-and-play replacement.
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Dual-Purpose (pH + ORP): Can be used for pH measurement or as a high-impedance ORP electrode in the same installation — useful for redundancy or process validation.
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Robust Reference Design: PTFE ring diaphragm + gel double-chamber provides resistance to poisoning (sulfide, cyanide) and extends service life in moderately contaminated media.
Applications
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Power & Utility: pH monitoring in boiler feedwater, condensate return, and demineralized (DI/RO) water loops.
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Semiconductor / High-Purity Water: UPW (Ultra-Pure Water) pH verification in rinse or make-up systems (within sensor's low-conductivity capability).
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Pharmaceutical Water Systems: WFI loop and purified water pH trend monitoring.
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General Water/Wastewater: Where low-ionic-strength samples are encountered, or as an upgrade to CPS11D for improved reference stability.
Note: For standard municipal wastewater/neutralization duties (higher ionic strength), the CPS11D-7BA21 / CPS11D-7BA2G is typically sufficient and more economical. Choose CPS72D when measuring in low-conductivity (< 50 µS/cm) or high-purity waters to avoid drifting reference potentials.
About ACH
Founded in 2012, ACH is a top-tier distributor of industrial automation products, supplying genuine devices from leading brands like ABB, P+F, E&H, AB, MTL to emerging markets worldwide. Our mission is to provide 100% Genuine products at the most competitive prices, helping customers reduce costs and strengthen their market position.
Frequently Ask & Questions
Are preferential prices available?
Long-term brand partners can get competitive product prices. At the same time, ACH controls the profit per order to 5%, providing the most competitive prices.
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Yes, all products from ACH are certified genuine OEM units. We acquire our inventory through official OEM channels and trusted third-party suppliers, ensuring every item is authentic and reliable.
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We'll handle the shipping for you. Through our partnerships, we can secure competitive rates with major carriers like FedEx, DHL, TNT, and UPS, ensuring a smooth and cost-effective delivery.
What is the warranty of goods?
One-year Warranty.
How long is the logistics cycle of the product?
Products are divided into spot and futures, and the delivery period of different brands of products is also different. For details, please contact the ACH business manager.
