Smart Water Conservancy

Precision Drip Irrigation Intelligent Control System for Cotton & Wheat

Q: LGF-PA66 electromagnetic flow meter vs turbine flow meter: which one should I use for clean water?

Both meters handle clean conductive water, but their construction leads to very different field behavior. Turbine meters use an impeller in the flow path to generate pulses. They are accurate (±0.5%–±1.0%), but the rotor is a wearing part: particles, scale and rust can jam it, low flow may never overcome bearing friction (a dead start-up band), and the constriction creates permanent pressure loss. On raw water carrying algae or floc, turbine bearings typically last only 1–2 years. The LGF-PA66 electromagnetic flow meter has an unobstructed measurement tube with no moving parts — only the liner and electrodes touch the medium. It is immune to particles and fibers, pressure loss is near zero, turndown reaches 100:1, and accuracy holds at velocities down to 0.3 m/s, which matches the strong day/night flow swings of supply networks. The aviation-grade PA66 composite body is roughly 60% lighter than a stainless body of the same size, cannot corrode, and the IP68 design allows submerged pit installation. Turbine meter: small-bore (DN4–DN40) batching of oil products or ultra-pure water. LGF-PA66: DN15 and above for potable water, reclaimed water and industrial water — especially custody-transfer points and DMA district meters. For more details, please visit our product page or contact our technical team.

Q: How should I choose between the 0.2% and 0.5% accuracy versions of the LGF-PA66 electromagnetic flow meter?

The LGF-PA66 is produced in both ±0.2% and ±0.5% accuracy versions. The choice depends on what the flow data is used for — not on picking the highest number. ±0.5% version : for process monitoring, internal water balance in wastewater plants, industrial cooling-water assessment and most DMA district meters, where readings guide operations rather than invoices. Paired with an EC32 RTU uploading instantaneous flow and pressure for night-flow leakage analysis, it is fully sufficient — and saves a price tier. ±0.2% version : for custody transfer and billing (water sales between companies, heat-supply metering), quota-based assessment, and any point verified under JJG 1033, the Chinese verification regulation for electromagnetic flow meters. On large lines a 0.3% error translates into a substantial annual billing difference. Two engineering details matter in practice. Rated accuracy holds within the 0.3–5 m/s velocity window — if the line runs persistently below 0.5 m/s, downsize the meter to raise velocity, otherwise neither version performs. The ±0.2% version is also less tolerant of installation disturbances: keep at least 10D straight pipe upstream and 5D downstream, away from pump-outlet turbulence. The integral PA66 body with built-in grounding electrode closes the signal loop inside the meter, which is what keeps the zero stable at high turndown. Specify the accuracy grade at order time — the two versions differ in converter calibration and are not interchangeable in the field. For more details, please visit our product page or contact our technical team.

Q: How to configure the LGF-PA66 with an EC32 RTU for a DMA district metering point? Which communication protocols are supported?

The standard DMA district metering point is an LGF-PA66 magnetic flow meter plus an EC32 RTU plus minimum-night-flow analysis on the platform side. There are two wiring options: connect the LGF-PA66 RS485 port to the EC32 serial port over shielded twisted pair running Modbus RTU (default 9600bps, 8N1), or feed a 4-20mA analogue signal into an EC32 AI channel. For long cable runs prefer the digital link — better noise immunity, and it also exposes totaliser, empty-pipe alarms and other diagnostics. Configuration points: Addresses and registers : when several LGF-PA66 meters share one RS485 bus, assign each a distinct slave address, poll instantaneous and totalised flow registers, and verify the unit scaling factors. Acquisition strategy : set the EC32 to sample every minute and report every 15 minutes. The 2:00–4:00 minimum-night-flow window must never be skipped — it is the core input for leakage analysis. Connectivity : the EC32 supports 4G Cat.1 and NB-IoT. In underground valve chambers with weak signal, order the external-antenna version and route the antenna to the chamber mouth. On the platform, alarm thresholds are set against the baseline of minimum night flow, combined with district pressure data to locate leaking pipe sections. Meter sizes follow the district main — commonly DN80 to DN300 — with flange standards matched to the existing network. For more information, please visit our product pages or contact our technical team.

Q: Should an electromagnetic flow meter be installed on the pump suction or discharge side? LGF-PA66 siting in pump stations

Install it on the discharge side whenever possible. On the suction side the meter sits under vacuum, where cavitation and degassing cause erratic readings, the flow profile is disturbed by elbows and reducers, and sustained vacuum stresses the flange-to-body seal. The LGF-PA66 has an all-insulated composite body with no liner to debond, but the positive-pressure siting rule still applies. Siting checklist for pump stations: Straight run ≥5D upstream and ≥2D downstream; extend the upstream run if a reducer sits close; Avoid the highest point of the line (air pockets) and the lowest point (sediment); prefer a mid horizontal run or a vertical section with upward flow; Flooded valve pits require the IP68-rated version; the PA66 body weighs about half of a comparable stainless-steel meter, which matters when lowering it into a confined pit; With frequent pump cycling the PA66 body withstands water-hammer shocks well, and an EC32 RTU can alarm on flow transients to watch pump health. If suction-side mounting is unavoidable, confirm the pump runs flooded-suction and keep the meter as close to the pump inlet flange as possible to shorten the vacuum section. Check pipe supports before installation — vibration from the pump outlet travels into the meter body and affects long-term sealing. For more information, please visit our product pages or contact our technical team.

Q: What is the pressure loss of the LGF-PA66 electromagnetic flow meter and does it add pumping energy cost?

The LGF-PA66 has a full-bore straight-through measuring tube with no throttling elements and no moving parts. Pressure loss comes only from minor local resistance: a few kPa up to roughly a dozen kPa at rated flow across DN15–DN1200. Orifice plates typically cost 10–40 kPa and turbine meters are comparable or worse, so the electromagnetic design is the energy-saving choice. Two points for pumping-cost evaluations: The PA66 body is moulded in one piece with low surface roughness; at the same size and flow it loses slightly less head than a stainless-steel body with a separate liner; In pump-station retrofits this pressure-loss level barely shifts the system resistance curve, so the pump operating point and long-term electricity consumption stay effectively unchanged. Where energy KPIs matter, pair the LGF-PA66 with an EC60 RTU: it collects the meter's 4–20 mA or pulse output together with pump power data and computes specific energy (kWh per m³) for the platform, exposing high-consumption periods. On DN300+ lines, every kPa of head saved translates into thousands of kWh per year — the reason many municipal stations replace orifice metering with the LGF-PA66 during upgrades. For more information, please visit our product pages or contact our technical team.

A soil moisture-driven precision irrigation and fertigation solution for large-scale cotton drip irrigation in Xinjiang and wheat sprinkler irrigation in the North China Plain. The system integrates electromagnetic flowmeters for precise metering, soil moisture-weather linked decision making, variable-rate irrigation control, and fertigation management, achieving 30-50% water savings.

Overview

Summary

Key Advantages

Soil moisture + weather linked intelligent irrigation decisions

LGF electromagnetic flowmeters for precise per-unit water metering

Smart field water devices with electromagnetic valve variable-rate control

Integrated fertigation for precision fertilizer delivery

Hero V9 RTU with solar power and 4G/BeiDou communication

Supports both cotton sub-film drip and wheat center-pivot sprinkler modes

Challenges

Large field areas with significant soil moisture spatial variability
Cotton water demand varies dramatically across growth stages
Severe groundwater over-extraction in North China Plain
Inefficient fertilizer application causing soil and groundwater pollution
Remote areas lacking stable power and network coverage

Results

Water savings of 30-50%, per-mu usage reduced from 500 to 250 cubic meters
Fertilizer utilization rate increased to 90%+, saving 15-20% per mu
Cotton yield increased 15-20%, wheat yield increased 10-15%
Groundwater extraction reduced by 30%+, supporting sustainable use
10,000 mu manageable by 2-3 remote operators

Solution Details

Precision Drip Irrigation Intelligent Control System for Cotton & Wheat

Xinjiang is China's largest cotton-producing region with over 35 million mu under cultivation, predominantly using sub-film drip irrigation. The North China Plain grows over 150 million mu of wheat, increasingly adopting center-pivot sprinkler and subsurface drip irrigation. Traditional flood irrigation wastes 400-600 cubic meters per mu, while precision irrigation can reduce this to 200-300.

Ecolor Technology's Precision Drip Irrigation Intelligent Control System for Cotton & Wheat uses soil moisture and weather data as decision inputs, electromagnetic flowmeters for precise per-unit water metering, smart field water devices controlling electromagnetic valves for variable-rate irrigation, and Hero V9 RTU for data acquisition and remote control, with an integrated fertigation platform managing both irrigation and fertilization schedules.

Core System Features

Soil moisture + weather linked intelligent irrigation decisions
LGF electromagnetic flowmeters for precise per-unit water metering
Smart field water devices with electromagnetic valve variable-rate control
Integrated fertigation for precision fertilizer delivery
Hero V9 RTU with solar power and 4G/BeiDou communication
Supports both cotton sub-film drip and wheat center-pivot sprinkler modes

Key Technical Specifications

Water Savings

200-300 m³/mu

Flowmeter Accuracy

±0.5%

Communication

4G / BeiDou

Power Supply

Solar + Battery

Control Valves

Electromagnetic

Supported Crops

Cotton, Wheat

Intelligent Decision-Making & Data Integration

The system integrates real-time soil moisture sensors and local weather station data to generate precise irrigation schedules. By linking environmental conditions with crop water requirements, it eliminates guesswork and ensures optimal water application. The LGF electromagnetic flowmeters provide per-unit water metering with exceptional accuracy, enabling farmers to track and control water usage at the individual field level.

Variable-Rate Control & Fertigation Platform

Smart field water devices equipped with electromagnetic valves allow variable-rate irrigation, adjusting water flow dynamically based on soil moisture levels and crop growth stages. The integrated fertigation platform manages both irrigation and fertilization schedules simultaneously, delivering precise amounts of nutrients directly to the root zone. This dual-function approach maximizes fertilizer efficiency while minimizing runoff and environmental impact.

Remote Monitoring & Communication

The Hero V9 RTU serves as the central data acquisition and control unit, powered by solar energy and communicating via 4G or BeiDou satellite networks. This enables real-time remote monitoring and control of irrigation systems from any location. Farmers can adjust schedules, view historical data, and receive alerts through a cloud-based platform, ensuring continuous operation even in remote field conditions.

Application Scenarios

Cotton sub-film drip irrigation in Xinjiang's arid regions
Wheat center-pivot sprinkler systems in the North China Plain
Subsurface drip irrigation for high-value row crops
Large-scale agricultural cooperatives requiring centralized control
Government-sponsored water-saving demonstration projects

Approach

How we implement intelligence into your infrastructure step by step.

Soil Moisture Sensor Network

Soil moisture and temperature sensors deployed every 50-100 mu, providing real-time spatial variability data as the foundation for variable-rate irrigation decisions.

Precise Irrigation Metering

LGF electromagnetic flowmeters installed at main and branch pipe junctions for precise per-unit water measurement. Aerospace-grade polymer resists fertilizer corrosion and extreme temperatures.

Variable-Rate Irrigation Control

Smart field water devices control electromagnetic valve openings, automatically adjusting irrigation volume based on soil moisture and crop growth stage.

Integrated Fertigation Management

Dissolved fertilizer delivered directly to root zones through the drip system, precisely proportioned based on growth stage and soil nutrient conditions to minimize waste and pollution.

Remote Monitoring & Scheduling Platform

Hero V9 RTU collects moisture, weather, flow, and valve data with solar power for field operation. 4G/BeiDou dual-link transmission to management platform with mobile app support.