Knick SE610 Online Conductivity Sensor
| Brand | Knick |
|---|---|
| Origin | Germany |
| Manufacturer Type | Original Equipment Manufacturer (OEM) |
| Product Origin | Imported |
| Model | SE610 |
| Pricing | Available Upon Request |
Overview
The Knick SE610 Online Conductivity Sensor is a robust, two-electrode conductivity probe engineered for continuous, high-stability measurement of low-conductivity aqueous solutions in industrial process control environments. Based on the principle of conductance measurement via alternating current (AC) excitation across a defined electrode geometry, the SE610 operates under the two-electrode (amperometric) method—optimized for applications where conductivity ranges from 0.01 µS/cm to 2000 µS/cm. Its coaxial stainless-steel electrode configuration ensures mechanical durability and long-term electrochemical stability, while integrated Pt1000 temperature sensing enables real-time, automatic temperature compensation (ATC) in accordance with DIN EN 27888 and ISO 7888 standards. Designed specifically for inline installation in clean water loops, ultrapure water (UPW) distribution systems, boiler feedwater monitoring, and pharmaceutical process water lines, the SE610 delivers reproducible performance without requiring frequent recalibration or electrode polishing.
Key Features
- Two-electrode coaxial design with passivated 316L stainless steel electrodes for corrosion resistance and minimal polarization effects
- Integrated Pt1000 RTD temperature sensor compliant with IEC 60751 Class B tolerance (±0.3 °C at 0 °C)
- Fixed 5-meter shielded PVC cable with IP68-rated molded connector for reliable signal integrity in humid or washdown environments
- Compact cylindrical housing (Ø22 mm × 120 mm) enabling installation in confined piping spools or sanitary tri-clamp adapters
- No moving parts or consumable components—designed for >5 years of continuous operation under stable flow conditions
- Compatible with Knick’s Stratos series transmitters (e.g., Stratos Pro, Stratos Easy) as well as third-party 4–20 mA loop-powered analyzers supporting 2-wire conductivity input
Sample Compatibility & Compliance
The SE610 is validated for use in deionized water, reverse osmosis permeate, condensate return streams, and purified water (PW/UPW) per USP <645>, EP 2.2.38, and JP 17 specifications. It is not recommended for highly viscous, suspended-solid-laden, or strongly oxidizing media (e.g., concentrated chlorine solutions), which may accelerate surface passivation or cause drift. The sensor meets electromagnetic compatibility requirements per EN 61326-1 (industrial environment) and carries CE marking under the EU Machinery Directive 2006/42/EC and Low Voltage Directive 2014/35/EU. Its wetted materials—316L stainless steel, PTFE-insulated leads, and food-grade silicone O-rings—are compliant with FDA 21 CFR §177.2600 and EU Regulation (EC) No. 1935/2004 for indirect food contact.
Software & Data Management
While the SE610 itself is an analog sensor without embedded firmware, its seamless integration into digital process automation infrastructures is enabled through compatible transmitter platforms. When paired with Knick Stratos transmitters, users access full diagnostics—including electrode resistance monitoring, temperature deviation alerts, and sensor aging indicators—via HART 7 or Modbus RTU protocols. Data logging, audit trail generation, and electronic signature support are available when connected to DCS or SCADA systems configured for 21 CFR Part 11 compliance. Calibration history, verification timestamps, and sensor-specific coefficients (cell constant K = 0.1 cm⁻¹) are stored in the transmitter’s non-volatile memory and exportable in CSV or PDF format for GLP/GMP documentation.
Applications
- Real-time monitoring of conductivity in pharmaceutical water-for-injection (WFI) and purified water (PW) loops
- Feedwater quality assurance in steam generation systems for power plants and industrial boilers
- In-line verification of rinsing efficiency in semiconductor wet benches and cleanroom tool exhaust scrubbers
- Continuous supervision of EDI (electrodeionization) module output in ultrapure water production skids
- Process validation support during commissioning and routine PQ (Performance Qualification) testing per ISO 14644 and ISPE Baseline Guide
FAQ
What is the cell constant of the SE610 sensor?
The SE610 is factory-calibrated with a nominal cell constant of 0.1 cm⁻¹, optimized for low-conductivity measurements.
Can the SE610 be used in pressurized pipelines?
Yes—it is rated for continuous operation up to 10 bar at 20 °C; pressure rating decreases linearly to 6 bar at 80 °C.
Is the fixed 5 m cable field-replaceable?
No—the cable is permanently molded and sealed; replacement requires full sensor exchange to maintain IP68 integrity and calibration traceability.
Does the SE610 require periodic cleaning or maintenance?
Under typical UPW service conditions, no routine cleaning is required; however, visual inspection and verification against a certified reference standard every 3–6 months is recommended per ASTM D1125 guidance.
How is temperature compensation implemented?
Using the integrated Pt1000 sensor, compensation follows the nonlinear NaCl-based algorithm per ISO 7888, with user-selectable reference temperatures (20 °C or 25 °C).
