Alfa Laval UV Sensor 9001357-01 QT201-50 IL-M SUV 20.2 Y2 C
Alfa Laval PureBallast UV Intensity Sensor 9001357-01 | OEM Replacement QT201-50 IL-M SUV 20.2 Y2 C
In an Alfa Laval PureBallast UV ballast water treatment system, the UV intensity sensor is not just a monitoring device—it’s the primary feedback element that directly governs treatment performance. The QT201-50 IL-M SUV 20.2 Y2 C (OEM part number 9001357 01) continuously measures the germicidal UV-C irradiance inside the reactor and sends a precise 4–20 mA signal to the system’s PLC. This single signal determines whether the control system ramps lamp power, throttles ballast flow, or triggers a critical alarm to protect your compliance status.
A drifted or failed sensor can fool the entire system into believing the UV dose is safe when it’s actually below the validated threshold. The result? Non-compliant ballast water entering your tanks, a potential USCG or IMO violation, and an unplanned port state control detention.
At Fiveruvc, we supply a precision-engineered OEM replacement for the 9001357-01 sensor that matches every critical optical, electrical, and mechanical specification. It’s a true drop-in solution—no modifications, no PLC reprogramming, no compromises.
Product Parameters for Fiver's Alfa Laval UV Sensor 9001357 01 Replacement
| Part Number | QT201-50/ 9001357 01 |
| Material | SUS316L |
| UV System Model | Pureballast BWTS |
| Model | SUV 20.2 Y2 C 40° 1000 W/m² |
Key Features for Fiver's Alfa Laval QT201-50 UV Sensor Replacement:
1. Full OEM Form, Fit & Function
Identical sensor core, M20×1.5 mounting thread, SUS316L body, 40° field-of-view calibration, and 4–20 mA active output. The sensor is mechanically interchangeable with all QT201-50/9001357-01 units installed on PureBallast 3.2 systems.
2. Pre-Calibrated, Inspection-Ready
Each sensor comes factory-calibrated at 0–1000 W/m² with a 40° detection angle, matching the standard configuration for all PureBallast 3.2 flow capacities. A high-range 0–3000 W/m² variant is available for vessels frequently operating in turbid, low-UV-transmittance coastal waters. Documentation to support annual calibration checks and PSC inspections is included.
3. Rugged Marine-Grade Construction
The entire probe body is machined from SUS316L stainless steel. It withstands continuous seawater immersion, the acidic wash of Alpacon Descalant Offshore CIP cycles, and the full −2 °C to 40 °C temperature swing of real-world ballasting—without corrosion or seal degradation.
4. Stable 4–20 mA Signal in Harsh E/R Environments
The active analog current loop resists electrical noise from VFDs, pumps, and switchgear, sending clean intensity data to the PureBallast control cabinet HMI and PLC over standard shipboard wiring.
5. Global Availability When You Need It Most
We maintain deep stock of the standard 1000 W/m² model and can dispatch to major ports worldwide. Whether you’re replenishing your planned maintenance stock or responding to an unexpected sensor failure, we keep your vessel’s off-hire time to an absolute minimum.
Working Principle of the UV Sensor
Installed inside the PureBallast UV reactor, the QT201-50 sensor captures real-time UV-C intensity penetrating ballast water and converts the irradiance value into standard 4–20mA signal sent to the PLC:
1> Clear water with high UV transmittance → High UV reading → System automatically lowers UV lamp power, runs full rated flow to save energy.
2> Turbid low-transmittance seawater → Low UV intensity feedback → PLC boosts UV lamp power to 100% and limits flow to 50% of certified capacity to satisfy disinfection dose requirements.
3> Once UV value drops below IMO/USCG regulatory thresholds, the sensor signal triggers system warning alarms, records event logs and reminds crew to perform CIP cleaning or inspect UV lamps/quartz sleeves.
Without reliable UV sensor data, the system cannot maintain compliant disinfection during ballasting/deballasting/stripping operations, bringing heavy risks during port inspection. Our replacement sensor restores full system monitoring capacity and ensures continuous compliance with international ballast water management conventions.
Frequently Asked Questions (FAQ)
1. Is this sensor fully compatible with the Alfa Laval PureBallast BWTS?
Yes. It is manufactured from the identical UV-TECHNIK SUV 20.2 Y2 C sensor core specified by Alfa Laval for part number 9001357-01. It fits directly into the UV reactor port (M20×1.5 thread) and connects to the same 4–20 mA analog input on the PLC.
2. Do I need to recalibrate the PLC after installation?
No. The sensor’s factory calibration (0–1000 W/m² = 4–20 mA) matches the default curve expected by the PureBallast control logic. Simply replace and restart the system. The annual sensor verification can be conducted using the same onboard procedure as the original.
3. What are the signs that my current sensor needs replacement?
Common failure symptoms include persistent “UV Intensity Low” alarms despite clean lamps and sleeves, a stuck reading at 4 mA or 20 mA, erratic intensity fluctuations, or the “Sensor Fail” trip message on the HMI.
4. Can this sensor be used in turbid coastal water?
The standard 0–1000 W/m² model works correctly across the full range of water clarities. For vessels that consistently operate in very low UVT water (e.g., muddy estuaries), a 0–3000 W/m² high-range variant is available to ensure the PLC receives meaningful data even at high lamp power.
5. How does this sensor help maintain USCG compliance?
The USCG type-approval validation of the PureBallast system relies on an accurate UV intensity measurement to calculate dose. This sensor provides that accuracy with ±3% full-scale precision, enabling the system to meet both the IMO D-2 and USCG living organisms discharge standard.
