ACITEK G300 Online DO Transmitter + DO6800 High-temperature Dissolved Oxygen Electrode

ACITEK G300 Online DO Transmitter + DO6800 High-temperature Dissolved Oxygen Electrode

1. Project Background

A fine chemical enterprise produces 50,000 tons of acrylate annually. Its reaction kettles operate at 80–120℃ and 0.6–1.0 MPa. Dissolved Oxygen (DO) must be strictly controlled within 0.5–1.5 mg/L. Excess DO causes side reactions and reduces product purity, while insufficient DO leads to incomplete chemical reaction and lower output.

The traditional polarographic electrodes suffered severe signal drift above 60℃, with membranes aging every 2–3 weeks. Frequent shutdown for calibration and replacement brought high maintenance costs and disrupted continuous production. The site adopted ACITEK G300 DO Transmitter + DO6800 High-temperature DO Electrode to solve the problems.

2. Product Specifications

ACITEK G300 Online DO Transmitter

• Measuring range: 0.00–40.00 ppm, Accuracy: ±0.01 ppm
• Working temperature: -10.0–130.0℃, automatic temperature compensation
• Output: 4-20mA & Modbus RTU, compatible with DCS system
• Protection class: IP65, explosion-proof design

ACITEK DO6800 High-temperature DO Electrode

• Temperature resistance: 0–130℃, supports 130℃ SIP sterilization
• Housing: 316L stainless steel, acid & alkali resistant
• High-temperature resistant membrane, anti-aging and anti-fouling
• Response time: t90 ≤ 60 s

                                                   

3. Installation & Commissioning

• Mounted on DN50 side port of reaction kettle, immersed 20–30 cm below liquid level, away from agitator and inlet to avoid bubble interference.
• Shielded cabling to prevent electromagnetic interference.
• Two-point calibration with oxygen-free water and air-saturated water. Stable performance lasts over 6 months after one calibration.
• Linked with DCS: Automatic nitrogen purge when DO below set value; cut off nitrogen supply when DO exceeds limit.

4. Application Results (6-month operation)

• Stable measurement: No signal drift at 120℃, DO fluctuation controlled within ±0.1 mg/L.
• Low maintenance: Membrane service life extended from 2–3 weeks to 8–10 months. Calibration cycle reaches 6 months, maintenance workload reduced by over 70%.
• Quality improvement: Acrylate purity rose from 99.2% to 99.7%, high-grade product rate increased by 12%.
• Higher efficiency: Gas consumption cut by 18%. Shutdowns caused by DO faults were eliminated, with annual output increased by 2000 tons.
• Durable performance: Continuous trouble-free operation for 180 days, no corrosion orscaling on electrode.

5. Customer Feedback

"This high-temperature DO monitoring solution perfectly solves our pain points of unstable reading and frequent maintenance. The G300 transmitter delivers reliable data and smooth communication. The DO6800 electrode works well under high temperature. It greatly guarantees our continuous production and product quality." — Manager Wang, Equipment Department

6. Applicable Scenarios

• Chemical industry: High-temperature reaction kettles, polymerization & oxidation processes, high-temperature wastewater
• Pharmaceutical industry: Fermenters with 121℃ SIP sterilization
• Power industry: Boiler feed water and condensed water trace oxygen monitoring
• Environmental protection: High-temperature industrial wastewater & leachate treatment