Swagelok® CR-288® Concentration Monitor
The Swagelok CR-288 concentration monitor provides real-time, temperature-compensated concentration measurement in a compact, ultrahigh-purity package. The monitor uses an optical system to accurately measure liquid chemical concentration in real time. The digital display unit (DDU) and 288-connect® software package combine convenient scalable data interface and acquisition options via a graphical user interface and liquid crystal display.

Sensor Specifications Fluid Pressure Rating Fluid Temperature Rating Process Fluid Index of Refraction Range Body Material Optical Window DDU Specifications Power Requirements Power Supply Input

0 to 80 psig (0 to 5.5 bar) 60 to 149°F (16 to 65°C) 1.3138 to 1.4108 DuPont® Teflon® (modified PTFE) Semiconductor-grade sapphire 24 V(dc) ± 10 %; 0.5 A max 100/240 V (ac); 50/60 ± 3 Hz

Sensor

• Compact, ultrahigh-purity package
• Bowl design optimizes fluid flow over sensor
• Meets SEMI F57-0301
• Fine thread flare and Nippon Pillar® Super 300 end connections standard; other end connections available

288-Connect Software

• Windows® based
• Interface into real-time process
• Real-time concentration and temperature data logging
• Allows rapid field calibration to specific process fluid

Cable

• Connects the sensor to the digital display unit
• FEP jacketed, EMC-shielded 10 ft (3 m) instrumentation cable
• IP67-rated snap-on connector to HD 15 serial connector

Digital Display Unit

• LCD display
• 4 to 20 mA output for temperature and concentration
• Two 5 V digital output channels
• RS-232 communication with computer software package
• Connects up to four sensors per DDU
• RS-232 serial DB25/DB9 to USB 1.1 adapter included
• White powder-coated aluminum housing with mounting slots

Performance Data

• Refractive Index Accuracy (Refractive Index Units, RIU): ± 1 × 10^–4
• Refractive Index Repeatability: 1 × 10^–5
• Concentration Accuracy: ± 0.1 % ¹
• Concentration Repeatability: 0.01 %¹
• Temperature Accuracy: ± 0.1°C
• Temperature Resolution and Repeatability: 0.01°C
• Response Time: 1.2 s (undamped)
• Damping is user configurable.

¹ Based on measuring ethylene glycol and water at 20 psig (1.3 bar), 76.1 to 78.8°F (24.5 to 26.0°C), and a calibration range of 0 to 100 % concentration.

Cleaning and Packaging
Every Swagelok CR-288 sensor is cleaned and packaged in accordance with SEMI Standard F57-301 for ultrahigh-purity fluid system components.

Testing and Calibration
Every Swagelok CR-288 sensor is factory leak tested to meet SEMI Standard E49.3, Section 9.2 for allowable leak rate. Each sensor is factory calibrated to deionized water at 20°C. The sensor calibration table can be updated with the 288-connect software to optimize performance with other liquids.

Traceability
Sensor bonnets are laser marked for traceability.