Product Description
The ABB 4641/800 is a highly reliable, industry-standard dissolved oxygen transmitter designed for precise measurement in diverse liquid processing applications. Renowned for its robust build and exceptional sensing accuracy, this device provides continuous monitoring capabilities, ensuring process efficiency and compliance in critical industrial environments. Its intelligent design simplifies calibration and maintenance while delivering stable, long-term performance even in challenging chemical or water treatment settings.
Product Specifications
| Feature | Specification |
| Model | ABB 4641/800 |
| Measurement Range | 0 to 20 mg/l or 0 to 200% saturation |
| Accuracy | ±0.1 mg/l or ±1% of span |
| Output Signal | 4 to 20 mA, isolated |
| Power Supply | 110/120V or 220/240V AC, 50/60 Hz |
| Dimensions | Approx. 160 mm x 160 mm x 160 mm |
| Weight | Approx. 2.5 kg |
| Country of Origin | United Kingdom / Italy (Varies by batch) |
Key Application Areas
The ABB 4641/800 is widely utilized across multiple industrial sectors including:
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Municipal and industrial wastewater treatment plants.
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Drinking water processing and monitoring.
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Power generation plants for boiler feedwater monitoring.
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Food and beverage production processes requiring sterile water control.
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Environmental water quality surveillance.
Operating Instructions
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Installation: Ensure the transmitter is mounted on a flat, vibration-free surface away from direct sunlight and extreme temperatures.
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Wiring: Connect the sensor cable and power supply according to the terminal diagram located inside the front cover. Ensure proper grounding to prevent electrical interference.
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Initialization: After powering on, allow the unit to perform its internal self-diagnostic check.
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Calibration: Perform a two-point calibration (Zero and Slope) using the front panel keypad. It is recommended to use air-saturated water or the specific calibration method detailed in the manual to ensure accurate slope settings.
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Configuration: Adjust the output range (mA signal) and alarm setpoints via the digital display menu to match your process requirements.
Important Usage Precautions
Regularly inspect the sensor membrane for signs of fouling, damage, or buildup, as this significantly impacts accuracy. Replace the electrolyte solution periodically as per the maintenance schedule. Avoid exposing the transmitter unit directly to wash-down water jets or harsh chemical vapors. Always ensure the local voltage matches the specified power rating before switching the device on to prevent internal damage.
Frequently Asked Questions (Q&A)
Q: What should I do if the reading drifts significantly?
A: Drift is often caused by a fouled membrane or depleted electrolyte. Clean the membrane with a soft cloth or replace the sensor tip and re-calibrate the unit.
Q: Can the 4641/800 be used in saltwater applications?
A: Yes, but the unit must be calibrated specifically for the salinity levels of your process to ensure the temperature and pressure compensation remains accurate.
Q: How often does the unit require calibration?
A: Depending on the process load, a monthly calibration is typically recommended, though high-accuracy requirements may necessitate more frequent checks.
Q: Is the 4641/800 compatible with external PLC systems?
A: Yes, it provides a standard 4-20 mA output that can be directly integrated into most PLC or DCS control systems for remote monitoring.
