RD-108 is a compact online dissolved oxygen controller designed specifically for the biological fermentation industry.It is divided into a basic version(RD-108) and a display version(RD-108B),and is core compatible with high-temperature conditions such as fermentation tanks.The instrument adopts a triple isolation design for input and output power supply, with strong anti-interference ability. It is equipped with TS-100-5M high-temperature fermentation dissolved oxygen electrode and CSS-100 side wall stainless steel installation kit, which can accurately measure dissolved oxygen concentration of 0.1 μ g/L~20mg/L and saturation of 0~100%, providing a stable and economical continuous monitoring solution for biological fermentation, seawater aquaculture and other fields.
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Features
Specifications
| Category | Specifications |
|---|---|
| Measurement Range | Dissolved Oxygen (DO): 0.1μg/L (ppb)~20mg/L (ppm), 0~100% Saturation |
| Measurement Accuracy | ±0.2% F.S ±1 Digit |
| Resolution | 0.1% (Saturation), 0.1μg/L (ppb), 0.01mg/L (ppm) |
| Drift | ≤0.5% of measurement range |
| Power Supply | 24VDC, 2-wire system |
| Signal Output | 1 channel of 0/4~20mA isolated current output; 1~5VDC output (with protection); maximum load resistance: ≤600Ω |
| Input Impedance | >0.5×10¹³Ω |
| Power Consumption | ≤2W; maximum output current: ≤22mA |
| Calibration Method | Two-point calibration, slope calibration |
| Mounting Type | Local installation, Wall-mounted |
| Physical Parameters | Dimensions: 125×65×100mm (L×W×D)Weight: 313g (basic model), 330g (with display)Protection Class: IP65 (NEMA 4X)Housing Material: ABS engineering plastic (waterproof and corrosion-resistant) |
| Operating Environment | Suitable for marine and high-temperature fermentation environments; temperature resistance: adapted to electrode operating range (0~60℃) |
Standard Configuration
- Host: RD-108
- Dissolved oxygen electrode: TS-100-5M
- Apt-get install CSS-100
Core Highlights
- Dissolved oxygen sensors make the breathable membrane resistant to changes in temperature. Electronic boards that are used in salt water last a long time.
- Isolation of the inputs, outputs, and power supplies at the industrial level keeps data transfer stable and stops electromagnetic interference.
- Easy zero and slope calibration, knob-style calibration, straightforward data presentation, simple menus, and fast start.
- Installation is easy with CSS-100 side wall kit for fermentation tanks and other equipment.
- Affordable and practical: Under 2W power consumption, energy-saving, eco-friendly, low maintenance, ideal for SME routine monitoring.、
- Waterproof, anti-corrosion, IP65 ABS engineering plastic shell for harsh industrial applications.
Featured Applications
- Biological fermentation: Keeping an eye on the amount of dissolved oxygen in real time while antibiotics, vaccines, biologics, and other things are being fermented to make the process as efficient as possible.
- Marine aquaculture: keeping an eye on the amounts of dissolved oxygen in saline waters where fish and shrimp are raised, with the goal of long-term stable operation through marine environment optimization.
- Small-scale sewage treatment: It’s both cost-effective and useful to keep an eye on the amount of dissolved oxygen in the aeration tanks at small and medium-sized sewage stations.
- Other instances include those that are sensitive to cost and those that don’t want disturbance, including keeping an eye on high-temperature water and industrial circulating water.
Daily maintenance and precautions
Maintenance points
- Electrode maintenance: Calibrate regularly (1-3 months), clean with neutral detergent when pollution is severe, and avoid using strong acids and alkalis; When not in use for a long time, it needs to be soaked in a specialized protective solution.
- Instrument maintenance: Keep the casing clean and avoid direct sunlight and corrosive environments; Check the relay contacts and wiring terminals once a year to prevent oxidation.
- Cable maintenance: Avoid pulling or bending cables. Special shielded wires should be used to extend cables, and the length should not exceed 30 meters.
Safety precautions
- Before installation and wiring, the power must be disconnected and operated by professionals to avoid the risk of electric shock.
- When connecting a relay to high-power equipment, an additional intermediate relay needs to be installed to prevent contact overload damage.
- If there is surge interference in the power supply, an independent power supply should be provided for the controller, separate from the power supply of equipment such as the dosing machine and mixer.
- The electrode installation must be well sealed with waterproofing, and it is strictly prohibited for water to enter the inside of the electrode or the wiring terminals, otherwise it may cause short circuit faults.
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The RD-108 online dissolved oxygen controller is based on “high temperature adaptation, strong anti-interference, and economic practicality.” These are the main needs for biological fermentation, marine aquaculture, and other situations. From minimalist calibration to flexible installation, from industrial grade protection to low-power design, it fully meets the monitoring requirements of low cost and high stability. Paired with high-temperature dedicated electrodes and stainless steel installation kits, a complete practical monitoring solution is formed to assist users in achieving process control with high cost-effectiveness.
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