HR4000 is an integrated multi-parameter water quality measurement instrument for measuring water quality in water. It can be installed with up to 7 sensors (optional built-in pressure sensor in the main body), to measure the following water quality parameters: temperature, conductivity, pH, ORP, turbidity, dissolved oxygen, COD, depth, chlorophyll, blue-green algae, ammonium ions, potassium ions, suspended solids, and salinity.
It has a special self-cleaning design, equipped with self-cleaning components to eliminate air bubbles and prevent microbial growth. It is applied in a wide range of water environments such as rivers, lakes, oceans, reservoirs, industrial water and groundwater.
High reliability, can operate in an unattended environment for months without maintenance；
Self-cleaning function, self-cleaning coating and wiper structure design ensures clean measurement window,
prevents microbial growth and reduces maintenance frequency;
Low maintenance frequency, only need to maintain once every three months, greatly reducing the maintenance workload.
Automatic recognition, each sensor probe is digital and can be mounted on any of the optional existing interfaces;
High integration, can freely select the different parameters of the sensor;
Structure drawing:
1 – Protection shell | 2 – Sensor cleaning brush |
3 – Sensor electrodes | 4 – Sensor base |
5 – Sensor housing | 6 – Signal output interfaces |
7 – Retaining ring |
3.1 Conductivity / temperature sensor
The conductivity and temperature are integrated into the same sensor, which not only provides accurate conductivity values and temperature values, but also the conductivity values provided by this sensor can be used to calculate salinity, specific conductivity and total dissolved solids, and the temperature data provided can be used for temperature compensation of other sensors on the HR4000.
Specifications(Conductivity):
Four-electrode method (physics) | |
Measurement range | 0～200mS/cm |
Accuracy | 0～100: readings ±0.5%; 100～200: readings±1% |
Resolution | 1μS/cm～100μS/cm（depend on range） |
Temp. compensation | Yes |
Working Temp. | 0～50℃ |
Storing Temp. | -20℃～+60℃ |
Calibration method | Single or two-point calibration |
Specifications(Temp.)
Measurement principle | Thermistor |
Measurement range | 0～50℃ |
Accuracy | ±0.2℃ |
Resolution | 0.1℃ |
Working Temp. | -5～+50℃ |
Storing Temp. | -20～+80℃ |
Calibration method | Single point calibration |
3.2 pH
The pH reflects the acidity and basic characteristics of a body of water. pH 7.0 is neutral, values below 7.0 are acidic, and values above 7.0 are alkaline. The pH sensor utilizes a new dual salt bridge structural design, which increases stability for long-term monitoring, extends the life of the sensor. It has the features of easy to clean, rugged, corrosion resistant, and many other features.
Specifications:
Measurement principle | |
Measurement range | 0～14 |
Accuracy | ±0.1 |
Resolution | 0.01 |
Temp. compensation | Yes |
Working Temp. | 0～50℃ |
Storing Temp. | 0～60℃ |
Calibration method | Two or three points calibration |
Measurement principle | Electrode method |
Measurement range | -1999～+1999mV |
Accuracy | ±20mV（Standard liquid） |
Resolution | ±0.1mV |
Temp. compensation | Yes |
Working Temp. | 0～50℃ |
Storing Temp. | 0～60℃ |
Calibration method | Single point calibration |
Measurement principle | Scattered light measurement |
Measurement range | 0.01～4000NTU |
Accuracy | 0～10NTU: ±0.1NTU； 10～100NTU：Readings ±2% or ±0.1NTUtake the biggest one 100～4000NTU: Readings ±5% |
Resolution | 0～10NTU：0.01NTU； 10～100NTU：0.1NTU； 100～4000NTU：1NTU |
Temp. compensation | Yes |
Working Temp. | 0～50℃ |
Storing Temp. | -20℃～+60℃ |
Calibration method | Single or two-point calibration |
Fluorescence | |
Measurement range | 0～200% Saturability 0～20mg/L |
Accuracy | 0～100%：<±1%； 100～200%：<±1.5% |
Resolution | 0.001mg/L～0.01mg/L（Depend on ranges） |
Temp. compensation | Yes |
Working Temp. | 0～50℃ |
Storing Temp. | -20℃～+60℃ |
Calibration method | Single or two-point calibration |
Measurement principle | Pressure sensitive method |
Measurement range | 200m(Other electrodes effective measuring depth is 60m) |
Accuracy | ＜±0.05 %F.S |
Resolution | 0.001m |
Calibration method | Single point calibration |
Chlorophyll sensor adopts the principle of fluorescence detection, and measures chlorophyll concentration by detecting the intensity of excited fluorescence. Chlorophyll sensors are widely used in environmental monitoring of algal growth, phytoplankton and eutrophication in water bodies such as river sections, lakes, reservoirs and near coasts.
Fluorescence detection | |
Measurement range | 0～400ug/L or 0～100RFU |
Accuracy | R²>0.999 |
Resolution | 0.01ug/L |
Temp. compensation | 0～50℃ |
Working Temp. | -20℃～+60℃ |
Calibration method | Single or two-point calibration |
The blue-green algae sensor adopts the fluorescence detection principle to measure the concentration of blue-green algae by detecting the intensity of the excited fluorescence. Blue-green algae sensors are widely used in environmental monitoring of algae growth, phytoplankton and eutrophication in water bodies such as river sections, lakes, reservoirs and near coasts.
Measurement principle | Fluorescence detection |
Measurement range | 0～100ug/L or 0～100RFU |
Linearity | R²>0.999 |
Resolution | 0.01ug/L |
Temp. compensation | 0～50℃ |
Working Temp. | -20℃～+60℃ |
Calibration method | Single or two-point calibration |
3.9 COD
The self-cleaning COD sensor utilizes the spectroscopic UV absorption detection principle to measure organic matter in water. The spectroscopic dual optical path structure design adopted by the sensor can automatically eliminate turbidity, ambient light and other interference. It has the advantages of long life, maintenance-free, no reagent, no pretreatment, and fast response speed. It can be applied to surface water, groundwater, municipal sewage, industrial wastewater and other applications that require long-term early warning monitoring of COD.
Measurement principle | Ultraviolet absorption |
Measurement range | 0.1～200mg/L （equiv. KHP） |
Accuracy | ±2% o0r 0.5 mg/L take the bigger one（equiv. KHP） |
Resolution | 0.1mg/L（equiv. KHP） |
Temp. compensation | 0～50℃ |
Working Temp. | -20℃～+60℃ |
Calibration method | Single or two-point calibration |
3.10 Ammonia Nitrogen
Ammonia nitrogen is measured by the composite ion electrode method, which consists of ammonium ion electrode, pH electrode (reference electrode) and temperature electrode. Intelligent measurement based on internal calibration algorithm and online calibration function make it possible to greatly improve the accuracy of measurement.
Specifications:
Measurement principle | Composite ion electrode method |
Measurement range | 0-10, 100, 1000mg/L optional |
Accuracy | 10% or±0.2mg/L take bigger one |
Resolution | 0. 01mg/L-0.1mg/L（Depend on range） |
Temp. compensation | Yes |
Working Temp. | 0～50℃ |
Storing Temp. | -20℃～+60℃ |
IV Transmitter Dimension and remarks:
4.1 Dimensions:
1Red -- Power supply（Vcc） | 2 Black（Blue）-- （GND） |
3Yellow（White）-- 485_B（485B） | 4 Green -- 485_A（485A） |
1——Turbidity （Turb） | 2——Conductivity（CT）Temperature（Temp） |
3——Blue-green algae（BGA） | 4——pH / ORP |
5——Dissolved Oxygen（DO） | 6——Chlorophyll（Chl） |
7——COD |
Note: the turbidity and COD sensors must be installed in position 1 and 7, ammonia and other sensors can choose their installation position freely.
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