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River Guard


Product Introduction

GHD-3000 River Guard is a set of green and clean reagent-free water quality sensor and wireless data transmission system as the core; an online monitoring system composed of modern automatic control technology, special analysis software and communication network.



The monitoring parameters of the river guard can be flexibly configured, with low cost and small size, and can be installed on the bank of the river arbitrarily. With a small amount of on-site construction, a high-density water quality sensor monitoring network can be built to meet the needs of gridding, intensive, and refined point placement. A remote monitoring system is established based on wireless local area network technology. The River Guard has the function of Internet of Things management, which can remotely view the status of the equipment, remotely control the restart, upgrade, and change of the monitoring frequency of the equipment; the system platform has data analysis, dynamic real-time evaluation, alarm locking, and graphic display; It can be matched with our water quality early warning forecasting system to realize water quality forecasting and safety early warning; it is a reliable guardian for safe management of water quality environment.



● High integration and small size;

● Convenient deployment, movable and easy to install;

● Short construction period and small on-site construction workload

● Support power supply methods such as city power and solar energy to meet different environmental conditions

● The product has a wide range of applications, which can be applied to urban black and odorous water monitoring, water quality grid monitoring, etc.;

● The instrument and system can run stably for a long time, with little maintenance, no reagent pollution, energy saving and environmental protection;

● The overall cost of the equipment is low, and large-scale distribution can be realized;

● Continuous and accurate monitoring data, sentinel-style early warning forecast.


Technical index

Cabinet material

Glass steel





Installation method

Floor installation

Ambient temperature


environment humidity




power supply


Power includes 420W self-priming pump

About 450W

Communication interface and protocol

GPRS<MQTT>, RS485<MODBUS-RTU> (optional)

Operating mode

Hourly point mode, periodic mode

Human-machine interaction

7 inch touch screen  

Manager permissions

Three-level operation management authority


Monitoring parameters


Note: The river guard is equipped with a water quality monitoring pool, and the monitoring probe is selected according to the needs (the length of a single probe does not exceed 700mm).

Our company's conventional optional monitoring probes are as follows:


Measuring range: 0-14 pH

Resolution: 0.01 pH

Accuracy: ±0.1 pH

Repeatability: ±0.1 pH



Measuring range: 0-2000us/cm; optional

Resolution: 1uS/cm,

Accuracy: ±2%FS

Repeatability: ±1%


Dissolved oxygen

Measuring range: 0-20 mg/L or 0~200% saturation

Measurement accuracy: ±3% of measured value or ±0.3mg/l,

Repeatability: ±0.3mg/l

Resolution: 0.01mg/l



Measuring range: 0.01-100 NTU, 0.01-4000 NTU

Measurement accuracy: ≤±2% of the measured value, or ±0.1NTU,

Repeatability: ±2%

Resolution: 0.01~0.1NTU, depending on different ranges



Measuring range: -2000mV ~ +2000mV

Response time: ≤10 seconds (reaching 95% of the end value) (after stirring)



Measuring range: 0.1~ 1000 mg/L

Resolution: 0.01 mg/l

Measurement accuracy: ±5% of the measured value or ± 0.2 mg/L, whichever is greater

Repeatability: ±5% or 0.2mg/l, whichever is greater

Ion selective electrode method


Measuring range: 0~1000mg/l COD (optional)

Measurement accuracy: ±5%

Repeatability: ±2%

Resolution: 0.01 mg/l

UV method

Chlorophyll a

Measuring range: 0-500 ug/L

Measurement accuracy: ±5%

Repeatability: ±3%

Resolution: 0.01 ug/L

UV method

Blue-green algae

Measuring range: 200—300,000cells/mL (optional)

Measurement accuracy: ±10%

Repeatability: ±3%

Resolution: 25 cells/mL



typical application

● Black and smelly water monitoring: dissolved oxygen, orp, ammonia nitrogen, transparency/turbidity.

● Urban river monitoring: pH, dissolved oxygen, conductivity, turbidity, etc.

● Park landscape lake/wetland monitoring: pH, dissolved oxygen, conductivity, turbidity, chlorophyll a, blue-green algae.

● Monitoring of sewage inlets in the river: pH, dissolved oxygen, conductivity, turbidity, UVCOD, ammonia nitrogen.

● Aquaculture water quality monitoring: pH, dissolved oxygen, ammonia nitrogen, etc.

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Customer message

Mainly engaged in the distribution of environmental monitoring instruments and meters, as well as the integration and operation and maintenance of environmental monitoring systems; Research and development, production, and sales of environmental monitoring instruments;

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