AC221/111311 ABB Bailey Analog Input Module
Brand：ABB Model number：AC221/111311
Country of origin: Sweden Product weight：0.55KG
HS code：8517623990
Product Details：
Product Dimensions：
The AC221 is an insertion-type conductivity sensor featuring high-grade stainless steel electrodes. Unlike carbon-based sensors, the stainless steel construction allows for measurement in ultra-pure water applications and offers superior resistance to polarization. The module is designed to be installed directly into pipelines, vessels, or process sample lines. It includes an integral temperature element to provide rapid thermal compensation, which is vital for accurate conductivity readings as liquid conductivity is highly temperature-dependent.
The technical specifications for the AC221/111311 configuration typically include the following:
Cell Constant: Choice of $0.01$ or $0.10$ (111311 typically denotes a specific cell constant and connection type).
Measurement Range: Capable of measuring down to $0.055 \text{ µS/cm}$ (ultra-pure water).
Wetted Materials: 316L Stainless Steel electrodes with a PEEK insulator.
Temperature Sensor: Integral Pt100 (3-wire) for rapid response.
Temperature Response: $T90 < 30$ seconds.
Maximum Operating Temperature: Standard up to $110°C$ ($230°F$); high-temperature versions with special cabling support up to $200°C$ ($392°F$).
Maximum Pressure: $20 \text{ bar}$ ($290 \text{ psi}$).
Process Connection: $3/4 \text{ inch}$ NPT or BSP thread (depending on the specific sub-code).
Ingress Protection: IP68 (fully submersible and dust-tight).
Ultra-Pure Water Accuracy: The 2-electrode design is the industry standard for trace conductivity measurements, making it ideal for monitoring demineralized water and steam condensate.
Maintenance-Free Design: The stainless steel electrodes are highly resistant to fouling and polarization, requiring virtually no routine maintenance or recalibration in clean water applications.
Rapid Thermal Compensation: With a $T90$ response time of less than 30 seconds, the integral Pt100 sensor ensures that the conductivity transmitter can adjust for temperature fluctuations almost in real-time.
Robust Construction: The use of 316L stainless steel and PEEK allows the sensor to operate in high-pressure and high-temperature environments that would destroy standard plastic sensors.
Easy Installation: The screw-in design simplifies mounting in standard pipe fittings or flow chambers.
Installation Clearance: Ensure there is sufficient physical clearance around the installation point to allow for the removal of the cell for periodic inspection or cleaning.
Orientation: The sensor should be installed in a position where the electrodes are always fully immersed in the liquid. Avoid mounting points where air pockets might form (top of a pipe) or where sediment might collect (bottom of a stagnant tank).
Avoid Over-tightening: When installing the sensor into a NPT or BSP thread, avoid excessive torque which may damage the cell body or the PEEK insulator.
Dry-out Prevention: After the sensor has been commissioned, it should ideally remain wetted. If allowed to dry out with process residue on the electrodes, accuracy may be affected until the electrodes are cleaned.
Cable Routing: Keep the sensor cable away from high-voltage power lines or heavy machinery to prevent electrical noise from interfering with the low-level conductivity signal.
The ABB AC221 is widely used across industries that require high-purity water monitoring:
Power Generation: Monitoring boiler feed water, steam condensate, and demineralizer performance to prevent turbine corrosion.
Water Treatment: Oversight of Reverse Osmosis (RO) systems and Ion Exchange units.
Semiconductor Industry: Measuring ultra-pure water (UPW) used for chip cleaning and wafer fabrication.
Pharmaceuticals: Monitoring Water for Injection (WFI) and purified water loops to ensure compliance with pharmacopeia standards.
Chemical Processing: Monitoring industrial rinse waters and dilute chemical concentrations.
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