YOKOGAWA SC450G-A-A – High-Purity Liquid Resistivity Converter | SC Series Analyzer Platform
Engineering Background
Accurate measurement of liquid resistivity is critical in semiconductor fabrication, pharmaceutical purification, and power generation water treatment. Contamination or ionic impurities in ultra-pure water directly impact yield, product quality, and equipment longevity. The YOKOGAWA SC450G-A-A Resistivity Converter is engineered to deliver precise, real-time resistivity data in demanding process environments where measurement drift or signal noise is unacceptable.
Product Positioning
The SC450G-A-A is a dedicated resistivity signal converter within YOKOGAWA’s SC Series liquid analyzer platform. It accepts input from compatible conductivity/resistivity sensors and outputs a calibrated 4–20 mA analog signal or digital process value for integration with DCS, PLC, or SCADA systems. Designed for procurement engineers specifying instrumentation for high-purity water loops, chemical dosing systems, and quality-critical process streams.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Model | SC450G-A-A |
| Manufacturer | YOKOGAWA Electric Corporation |
| Series / Platform | SC Series Liquid Analyzer |
| Function | Resistivity Converter / Transmitter |
| Measurement Range | 0 – 20 MΩ·cm (high-purity water grade) |
| Analog Output | 4–20 mA DC (isolated) |
| Temperature Compensation | Automatic (NTC/PT sensor compatible) |
| Power Supply | 24 V DC (loop-powered / external) |
| Enclosure Rating | IP65 (dust-tight, water jet resistant) |
| Mounting | Panel mount / DIN rail compatible |
| Operating Temperature | 0 °C to 55 °C |
| Storage Temperature | –20 °C to 70 °C |
| Weight | Approx. 2,130 g (with housing) |
| Compliance | CE, RoHS |
| Country of Origin | Japan |
Proven Application Environments
- Semiconductor & Electronics Manufacturing – Ultra-pure water (UPW) loop monitoring for wafer cleaning and rinse processes
- Pharmaceutical & Biotech – WFI (Water for Injection) and purified water quality verification per USP/EP standards
- Power Generation – Boiler feedwater and condensate resistivity monitoring in thermal and nuclear plants
- Chemical Processing – Inline resistivity control for reagent preparation and solvent purity verification
- Food & Beverage – CIP (Clean-in-Place) rinse water quality confirmation
Engineering Advantages
- High-Resolution Measurement – Resolves resistivity changes at the sub-MΩ·cm level, suitable for UPW applications requiring >15 MΩ·cm purity
- Automatic Temperature Compensation (ATC) – Eliminates manual correction errors; maintains accuracy across full process temperature range
- Isolated 4–20 mA Output – Galvanically isolated signal output prevents ground loops in multi-instrument DCS architectures
- Robust IP65 Enclosure – Withstands washdown, humidity, and chemical splash in wet process areas
- YOKOGAWA SC Series Ecosystem – Seamless integration with YOKOGAWA sensors, flow cells, and CENTUM VP / ProSafe-RS control systems
- Long Service Life – Industrial-grade components rated for continuous 24/7 operation; low maintenance design
System Architecture & Signal Flow
The SC450G-A-A operates as the signal processing core in a two-wire or four-wire resistivity measurement loop:
- Sensor Input – Resistivity/conductivity sensor (toroidal or contacting type) installed in process pipe or flow cell
- SC450G-A-A Converter – Receives raw sensor signal; applies temperature compensation algorithm; converts to calibrated resistivity value
- Analog Output (4–20 mA) – Transmits process value to DCS input card, PLC analog input module, or standalone recorder
- Display / Configuration – Local display (if equipped) shows real-time resistivity; configuration via front-panel keys or HART (model-dependent)
- Alarm Relay – Configurable high/low setpoint relays for process interlock or alarm annunciation
Sourcing & Quality Verification
- Authentic YOKOGAWA OEM Hardware – All units sourced through verified industrial supply channels; no grey-market or refurbished stock without explicit disclosure
- Pre-Shipment Inspection – Each unit inspected for physical integrity, label authenticity, and functional verification before dispatch
- Traceability – Serial number and manufacturing date recorded; full documentation package available on request (datasheet, calibration certificate, CE declaration)
- Warranty – 12-month warranty against manufacturing defects; DOA replacement policy within 7 days of receipt
Procurement Process
- Confirm Compatibility – Verify sensor model and signal type match SC450G-A-A input specifications; contact our engineers if uncertain
- Request Quote – Submit RFQ via Konmask.com or email support@konmask.com with quantity and delivery requirements
- Order Confirmation – Purchase order accepted; lead time confirmed (ex-stock or 5–15 business days for sourced units)
- Shipment & Documentation – Shipped with commercial invoice, packing list, and technical datasheet; DHL / FedEx / sea freight options available
- After-Sales Support – Technical support available via email or WhatsApp; installation guidance and parameter configuration assistance provided
Technical FAQ
Q: Is the SC450G-A-A compatible with toroidal (inductive) sensors?
A: Compatibility depends on the specific sensor model and SC450 variant suffix. Please confirm your sensor model with our technical team before ordering.
Q: Can the output be configured for 0–10 V instead of 4–20 mA?
A: The standard SC450G-A-A outputs 4–20 mA. Voltage output variants or signal converters can be specified separately if required.
Q: What is the maximum cable length between sensor and converter?
A: Typically up to 30 m for standard sensor cable; shielded cable recommended. Consult YOKOGAWA installation guidelines for longer runs.
Q: Is HART communication supported?
A: HART support is model-suffix dependent. The SC450G-A-A suffix indicates specific hardware configuration — confirm with datasheet or contact Konmask for clarification.
Q: Can this unit be used for conductivity measurement instead of resistivity?
A: Resistivity and conductivity are reciprocal values. The SC450G-A-A displays resistivity (MΩ·cm); many units allow display mode switching. Verify with the product datasheet.
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