ATAGO CM-Isα Intrinsically Safe In-Line Refractometer for DMSO Monitoring
| Brand | ATAGO |
|---|---|
| Origin | Japan |
| Model | CM-Isα |
| Product Type | In-line Refractometer |
| Temperature Control | Yes |
| Digital Display | Yes |
| Measurement Range | Brix 0.0–80.0% |
| Accuracy | Brix ±0.1%, Refractive Index ±0.0002 |
| Resolution | Refractive Index 0.00001, Brix 0.01% or 0.1%, Temperature 0.1°C |
| ATC Range | 5–100°C |
| Output | DC 4–20 mA or RS-232C |
| Power Supply | DC 24 V |
| Explosion Protection Rating | Ex ia IIB T3 Ga TA |
| Operating Temperature | −15 to +160°C |
| Certifications | ATEX, IECEx compliant for Zone 0/1/2 |
Overview
The ATAGO CM-Isα is an intrinsically safe, in-line refractometer engineered for continuous, real-time concentration monitoring of dimethyl sulfoxide (DMSO) solutions in hazardous industrial environments. Based on the fundamental optical principle of critical-angle refractometry, the instrument measures the refractive index of process fluids flowing through a sapphire prism interface, then converts this value—via factory-calibrated algorithms—into precise Brix (% w/w sucrose-equivalent), DMSO mass concentration (%), and temperature. Unlike offline titration or laboratory-based HPLC analysis, the CM-Isα delivers millisecond-response measurements without sample extraction, enabling closed-loop process control in continuous manufacturing. Its design complies with rigorous intrinsic safety requirements for Zone 0 (gas group IIB, temperature class T3, equipment protection level Ga), making it suitable for installation directly in explosive atmospheres where ignition sources must be eliminated at the component level.
Key Features
- Intrinsically safe certification per IEC 60079-0, -11 and ATEX 2014/34/EU: Ex ia IIB T3 Ga TA — validated for continuous operation in Zone 0, Zone 1, and Zone 2 classified areas.
- High-stability sapphire measuring prism with chemical resistance to DMSO, DMAC, NMP, and other aggressive polar aprotic solvents used in fiber spinning, pharmaceutical synthesis, and battery electrolyte production.
- Integrated Peltier-based temperature control and high-resolution PT100 sensor ensure measurement stability across −15°C to +160°C process temperatures; automatic temperature compensation (ATC) active from 5°C to 100°C.
- Optical resolution of 0.00001 RIU and Brix resolution down to 0.01%, supporting tight process tolerances required in GMP-compliant API crystallization and lyophilization support systems.
- Dual-output interface: isolated 4–20 mA analog output (HART-compatible) for PLC/DCS integration and RS-232C serial port for configuration, diagnostics, and raw data logging via PC or SCADA.
- Robust stainless-steel (SS316L) wetted parts and IP67-rated housing rated for washdown and corrosive ambient conditions.
Sample Compatibility & Compliance
The CM-Isα is specifically validated for homogeneous, non-particulate DMSO aqueous and anhydrous solutions, including those containing up to 20% dissolved polymers (e.g., polyacrylonitrile in acrylic fiber coagulation baths). It is not intended for slurries, emulsions, or highly turbid media. The device meets ISO 21501-4 for optical particle-free liquid measurement traceability and supports audit-ready documentation under FDA 21 CFR Part 11 when paired with ATAGO’s optional data acquisition software (RefractoSoft™). Calibration verification follows ASTM D1218 and ISO 2859-1 sampling plans, with optional NIST-traceable calibration certificates available upon request.
Software & Data Management
RefractoSoft™ (sold separately) provides secure, time-stamped data acquisition, trend visualization, alarm thresholding (e.g., deviation >±0.3% Brix), and export to CSV or OPC UA servers. All configuration changes—including calibration offset adjustments—are logged with user ID, timestamp, and reason code, satisfying GLP/GMP electronic record requirements. The embedded firmware supports password-protected access levels (Operator, Technician, Administrator) and encrypted firmware updates. Audit trails are retained onboard for ≥30 days and exportable for regulatory review.
Applications
- Real-time DMSO concentration control in acrylic fiber wet-spinning coagulation baths to maintain fiber morphology and tensile strength consistency.
- Concentration monitoring during DMSO recovery and purification loops in pharmaceutical intermediate manufacturing (e.g., paclitaxel synthesis).
- Process validation and PAT (Process Analytical Technology) deployment for solvent exchange steps in biologics formulation.
- Quality assurance in lithium-ion battery electrolyte blending lines where DMSO serves as a high-dielectric co-solvent.
- Automated feedback control of evaporation rate in multi-effect DMSO concentrators operating under vacuum.
FAQ
What explosion protection standard does the CM-Isα meet?
It complies with IEC 60079-11 (intrinsic safety “ia”) and carries ATEX and IECEx certification Ex ia IIB T3 Ga TA — certified for uninterrupted use in Zone 0 gas atmospheres.
Can the CM-Isα measure DMSO concentration directly—not just Brix?
Yes. Using ATAGO’s proprietary DMSO-specific calibration curve (pre-loaded in firmware), it outputs % w/w DMSO concentration with traceability to gravimetric reference standards.
Is temperature control mandatory for accurate readings?
While ATC is active from 5–100°C, the integrated Peltier module enables active thermal stabilization of the prism—critical for minimizing drift during rapid ambient temperature fluctuations in outdoor or unconditioned plant areas.
How often does the instrument require recalibration?
Under stable process conditions, annual verification against certified DMSO reference standards is recommended; however, daily zero-check using deionized water (RI = 1.33300 at 20°C) is advised as part of routine SOPs.
Does the CM-Isα support Modbus RTU or Profibus DP communication?
No—only 4–20 mA (HART-enabled) and RS-232C are natively supported. Protocol conversion to Modbus TCP or Profibus requires an external gateway compatible with IEC 61158 standards.
