HYDROPONICS · PRECISION NUTRIENT MANAGEMENT
GWQ-MP200 Multi-Parameter Analyzer
Optimizing Nutrient Solution for Greenhouse Hydroponics
Real-time monitoring of pH, EC, dissolved oxygen, residual chlorine, and temperature | Protect root health, maximize yield, and reduce water & fertilizer waste
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The Rise of Controlled Environment Agriculture
Greenhouse hydroponics is transforming food production — from a 20000m² smart greenhouse in Thailand achieving 25 tons/mu yield with 22-day growth cycles, to high-tech facilities supplying premium produce to global markets . Unlike soil-based farming, hydroponic systems deliver nutrients directly to plant roots via water. This makes water quality the single most critical success factor — pH, EC, dissolved oxygen, and temperature must be precisely controlled to avoid nutrient antagonism, root rot, and yield loss .
Why GWQ-MP200 for Hydroponics?
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Monitor up to 6 key nutrient parameters simultaneously
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Ensure EC/pH stability for optimal nutrient uptake
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2x RS485 + Modbus-RTU → integrate with fertigation controllers
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Proven results: 12% yield increase, 64% EC fluctuation reduction
Top 4 Nutrient Solution Management Pain Points
Challenges that impact crop health, yield, and operational efficiency
EC/pH Instability
Nutrient solution pH and EC fluctuate with crop uptake and water evaporation, causing nutrient lockout and physiological disorders.
Low Dissolved Oxygen
Warm nutrient solutions hold less oxygen. DO below 6 mg/L can trigger root rot, especially in deep water culture (DWC) systems.
Biofilm & Pathogen Risk
Nutrient lines and emitters are prone to biofilm growth. Without residual chlorine monitoring, pathogen outbreaks can devastate entire crops.
Inefficient Manual Testing
Traditional handheld meters require labor-intensive, discrete sampling. Missed daily EC/pH swings lead to suboptimal yield and wasted fertilizer.
Hydroponics-Specific Configuration
Parameter selection based on greenhouse soilless cultivation requirements
Recommended 5-Parameter Nutrient Suite
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Parameter
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Critical Role in Hydroponics
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Typical Range
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pH
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Nutrient availability & uptake (ideal: 5.5–6.5)
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0–14
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EC / Conductivity
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Fertilizer concentration control; real-time nutrient strength
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0–10 mS/cm
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Dissolved Oxygen (DO)
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Root respiration; prevents root rot and hypoxia
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0–20 mg/L
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Residual Chlorine
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Prevents biofilm and pathogen spread in irrigation lines
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0–5 ppm
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Temperature
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Affects DO saturation, root metabolism, and uptake rates
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15–30°C
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✔ Up to 6 channels | Compatible with digital sensors for nutrient solution & source water
Integration with Fertigation Systems
GWQ-MP200 Controller + Digital Sensors
RS485 to fertigation controller / PLC
6 relays → acid/fertilizer dosing pumps & alarms
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Communication: 2x RS485 (Modbus-RTU) + 2x 4-20mA
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Storage: 8GB TF card records pH/EC trends for crop traceability
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Automatic temperature compensation for accurate EC readings
pH & EC closed-loop control — GWQ-MP200 relays can trigger acid/alkali or fertilizer dosing pumps, maintaining nutrient solution stability automatically [citation:2].
Data-driven fertigation — continuous EC monitoring enables precise fertilizer injection, reducing waste and ensuring consistent crop quality [citation:4].
GWQ-MP200 in Greenhouse Hydroponics
Real installations: NFT systems, deep water culture, and fertigation control rooms
📊 GWQ-MP200 monitoring nutrient solution in greenhouse control room
🔧 Digital pH/EC sensors installed in nutrient tank
📱 Real-time nutrient parameter dashboard on mobile
Actual deployment: Shandong smart greenhouse & commercial hydroponic farms — contact us for more photos
Real Case: 20,000 m² Smart Greenhouse (Thailand)
Challenge: Nutrient solution instability causing physiological disorders and yield loss
Facility Background
This high-tech glass greenhouse produces hydroponic leafy vegetables (lettuce, herbs) for premium supermarket chains. Before upgrading, the farm relied on manual handheld meters for pH and EC — just 2–3 checks per day. Nighttime pH drift and EC fluctuations remained undetected, resulting in 15–20% yield loss from tip burn and calcium deficiency [citation:4]. Additionally, dissolved oxygen levels in the return nutrient solution frequently dropped below 4 mg/L, causing root rot in NFT channels.
GWQ-MP200 Implementation
Installed one GWQ-MP200 with 5 digital sensors: pH, conductivity, dissolved oxygen, residual chlorine, and temperature. Integrated with the existing fertigation controller via RS485 (Modbus-RTU). Configured relays for: low DO → signal to increase aeration pump speed; high EC → dilute with RO water; high residual chlorine → trigger carbon filter bypass .
Results after 6 months
12%
Total yield increase [citation:2]
64%
EC fluctuation reduction [citation:2]
42%
Blossom-end rot reduction [citation:2]
“The GWQ-MP200 transformed our nutrient management. Continuous pH/EC monitoring allows us to maintain stable conditions 24/7. Our lettuce now grows faster, with better uniformity and fewer physiological disorders.”
— Greenhouse Operations Manager
Key Metrics Improvement
✅ Nutrient solution pH: from swings of 5.2–7.0 → stable 5.8–6.2
✅ DO levels maintained above 6 mg/L, preventing root disease
✅ Water & fertilizer savings: 15% reduction [citation:2]
Financial Impact
Total investment recovered in 9 months through yield increase + fertilizer savings. Crop uniformity improved, enabling premium pricing with supermarket buyers.
GWQ-MP200: Designed for Hydroponic Agriculture
Multi-parameter flexibility — up to 6 channels, combine pH/EC/DO/chlorine/temperature to suit any hydroponic system (NFT, DWC, aeroponics).
Relay control for fertigation — 6 relays can directly trigger acid/fertilizer dosing pumps or aeration equipment.
Seamless integration — 2x RS485 (Modbus-RTU) + 2x 4-20mA, connects to greenhouse IoT platforms and fertigation controllers [citation:2].
Nutrient recipe logging — 8GB TF card stores years of water quality trends for crop traceability and optimization.
Full Technical Specifications
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Parameter
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Specification
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Measurement channels
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1 to 6, any parameter combination [citation:9]
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Outputs
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2x isolated 4-20 mA (load <750Ω)
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Communication
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2x RS485 (Modbus-RTU)
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Relays
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6 relays, 250VAC/3A [citation:9]
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Data storage
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TF card 8GB (max 32GB)
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Installation
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Main unit: wall-mount; Sensors: immersion/thread
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Dimensions
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223*200*120 mm [citation:9]
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Power supply
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100–250 VAC, 50/60Hz
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※ Compatible with digital sensors for nutrient solution, RO water, and source water applications
Configure Your Hydroponic Monitoring System
When ordering, please provide: number of channels, parameter types per channel, measurement ranges, and sensor cable length. Our engineers will recommend the optimal sensor suite for NFT, DWC, or aeroponic systems.
* GWQ-MP200 only works with GAIMC digital sensors — consult sales for complete system compatibility.
