Comparing Handheld vs. 24/7 Fixed Oxygen Meters for Aquaculture: Which Option Suits Your Pond Best?

To meet these demands, AQUA MINA offers two lines of oxygen meters for fish and shrimp farming: the AQUA-DO200C handheld meter and the AQUA-DO300C 24/7 fixed monitoring and warning system. Both integrate DO, pH, and water temperature testing capabilities but differ in design, operating modes, and monitoring functions. So how do handheld oxygen meters and 24/7 fixed units differ? Which device best suits your farm scale and management needs? Let's explore the details with AQUA MINA.

1. Similarities Between the Two AQUA MINA Oxygen Meter Lines

Though developed for different operational approaches, both lines share a common objective: helping farmers track critical water quality parameters.

Specifically, both the AQUA-DO200C and AQUA-DO300C utilize the S20B sensor, integrating three core measurements:

1. Dissolved Oxygen (DO): Reflects the amount of oxygen in the water—an essential factor for respiration and living activities of shrimp and fish.

2. pH Level: Indicates acidity or alkalinity, assisting in evaluating shifts that could affect pond environment conditions.

3. Water Temperature: Influences aquatic metabolism, livestock oxygen demand, and oxygen solubility in water.

These parameters are closely interconnected. For instance, as water temperature rises, oxygen solubility tends to decline. Meanwhile, aquatic respiration and algal photosynthesis cause DO levels to fluctuate significantly between day and night.

Therefore, combined monitoring of all three indicators provides farmers with comprehensive data to evaluate water conditions rather than relying on a single isolated parameter.

However, the core distinction lies not in what they measure, but in how farmers access data and manage their pond environment.

2. Comparison: AQUA-DO200C Handheld Meter vs. AQUA-DO300C Fixed System

 

As shown in the comparison, both devices serve distinct operational priorities:

1. AQUA-DO200C excels in flexible mobility, enabling farmers to test water parameters across multiple pond locations or different ponds.

2. AQUA-DO300C focuses on continuous 24/7 monitoring and automated alerts, helping managers track water quality even when away from the farm.

3. AQUA-DO200C Handheld Oxygen Meter – Flexible Environmental Testing

The AQUA-DO200C handheld meter is ideal for farmers and technicians performing direct field inspections. With its compact build and 3-in-1 measurement capabilities, it empowers users to test anytime and anywhere.

1. 3.1. Convenient Mobility Across Multiple Ponds: For multi-pond farms, technicians must inspect water quality across various zones. Using a handheld meter allows operators to carry a single tool to every sampling point without installing fixed systems everywhere. Users can easily compare readings across feeding zones, aeration sites, or pond centers to spot localized variations.

2. 3.2. 3-in-1 Integrated Parameters: Powered by the S20B sensor, the AQUA-DO200C measures DO, pH, and temperature simultaneously, simplifying gear setup and routine field checks.

3. 3.3. Bluetooth Data Tracking: Beyond direct screen readings, Bluetooth connectivity transfers data to mobile devices for convenient tracking during field inspections. (Note: Due to manual operation and Bluetooth range, it is not a substitute for continuous 24/7 remote monitoring).

 

4. AQUA-DO300C Oxygen Monitoring & Alarm System – 24/7 Pond Protection

Unlike handheld units, the AQUA-DO300C is designed for permanent installation. The system includes an AS300C display controller, S20B sensor, protective electrical enclosure, light/siren tower, and mounting accessories.

1. 4.1. Continuous Day-and-Night Monitoring: The S20B sensor continuously logs DO, pH, and temperature at the installation point. Continuous 24/7 tracking reveals environmental trends, particularly during critical late-night and pre-dawn hours when DO drops lowest.

2. 4.2. Remote Monitoring via Navis App: Featuring Wi-Fi connectivity, the system sends live data to the Navis mobile app, allowing managers to monitor pond conditions remotely anytime, anywhere.

3. 4.3. Multi-Threshold Automated Alarms: Users can configure custom alarm thresholds. If metrics exceed set limits, the system triggers the on-site light and siren tower while sending push notifications to the manager's phone via the Navis app.

4. 4.4. Auxiliary Device Control Capabilities: Supports two operation modes: MONITOR (measurement and alarms only) and CONTROL (enables 4 output control ports to interface with external equipment based on system wiring and setup).

5. Handheld vs. Fixed System: Which Should You Choose?

1. Scenario 1 (Testing multiple locations/ponds): Choose AQUA-DO200C for portable, point-in-time sampling across various ponds or zones.

2. Scenario 2 (24/7 continuous monitoring): Choose AQUA-DO300C for round-the-clock tracking at a fixed location, especially during night shifts.

3. Scenario 3 (Remote phone alerts): Choose AQUA-DO300C for automated push notifications and remote viewing via Internet/Navis app.

4. Scenario 4 (Hybrid approach): Combine both systems for comprehensive farm management—AQUA-DO300C provides continuous tracking at key points, while AQUA-DO200C handles spot checks across remaining areas.

 

6. Combining Handheld and Fixed Meters: Complementary Monitoring

Water quality varies over time and space. A fixed meter delivers continuous time-series data at one spot, whereas a handheld meter offers spatial coverage across multiple points at a single moment. Using both provides full temporal and spatial visibility into pond health.

7. Key Considerations Before Investing

1. Monitoring Goals: Periodic multi-point testing vs. 24/7 continuous point monitoring.

2. Infrastructure Requirements: Power supply, mounting locations, Wi-Fi connectivity, and sensor placement for fixed units.

3. Farm Scale & Layout: Match device count and placement to pond numbers and layout complexity.

4. Operational & Maintenance Costs: Factor in installation, calibration, sensor cleaning, and replacement parts.

5. Alert Needs: Prioritize remote alarm capabilities if off-hours threat detection is crucial.

 

8. AQUA MINA – Tailored Oxygen Monitoring Solutions

1. AQUA-DO200C: Compact, flexible, and portable—ideal for multi-point field surveys and routine inspections.

2. AQUA-DO300C: Fixed, continuous, and automated—ideal for 24/7 monitoring, Navis app remote tracking, and threshold alerts.

Explore AQUA MINA Oxygen Meter Series:

1. AQUA-DO200C Handheld Shrimp & Fish Oxygen Meter: View product details

2. AQUA-DO300C Fixed Shrimp & Fish Oxygen Monitoring & Alarm System: View product details

 

 

AQUA MINA CO., LTD