Multiparameter Water Quality Sensor With Self Cleaning Brush For Wastewater Monitoring

JW-iMP-301(K33) Multiparameter Water Quality Sensor With Self Cleaning Brush is an integrated digital probe designed for continuous online measurement where several water quality parameters need to be monitored at one submerged location.

It supports optional sensors for:

• Dissolved oxygen
• pH
• Conductivity
• ORP
• Turbidity
• Temperature

The probe can monitor up to five configurable water-quality parameters plus temperature, providing up to six measurement values in one integrated system.

With RS485 communication, Modbus RTU protocol, IP68 protection and an integrated automatic cleaning brush, the iMP-301 is suited to long-term submerged monitoring where probe fouling and regular maintenance are important considerations.

Its compact multiparameter architecture is particularly useful for wastewater and process-water monitoring points where several measurements need to be collected through a single digital communication interface.

1. Product Overview

Long-term water quality monitoring is different from occasional manual sampling.

When probes remain immersed continuously, the sensing surfaces may gradually be affected by biological attachment, suspended matter, deposits and other contamination. These conditions can increase the frequency of manual cleaning and may affect measurement stability if sensors are not maintained correctly.

JW-iMP-301(K33)  multiparameter water quality sensor combines several digital sensing modules into one integrated platform and incorporates an automatic cleaning mechanism.

Users can select different combinations of:

• Dissolved oxygen
• Conductivity
• Turbidity
• pH
• ORP

Temperature is also measured as part of the system.

Measured values are transmitted through an RS485 bus using Modbus RTU, allowing the probe to be connected to a compatible controller, RTU, data logger or monitoring system.

According to the product documentation, the sensor is intended for long-term online monitoring and uses individual quick-connect waterproof interfaces to facilitate sensor installation and maintenance.

2. Why a Self-Cleaning Brush Matters in Wastewater Monitoring

Wastewater environments can place more maintenance demands on submerged instruments than relatively clean water.

Depending on the monitoring point, sensor surfaces may be exposed to:

• Suspended particles
• Biological attachment
• Organic deposits
• Sediment
• Surface fouling

The iMP-301 includes an integrated cleaning brush that periodically cleans the sensor surfaces.

Its purpose is to help reduce surface contamination and biological attachment during continuous monitoring.

The cleaning strategy can be adjusted according to site conditions rather than operating at only one fixed interval.

Adjustable Cleaning Interval

The factory default cleaning interval is:

30 minutes

Adjustable range:

6–6000 minutes

Adjustable Cleaning Cycles

Factory default:

3 cycles

Adjustable range:

0–10 cycles

These settings are available through the sensor’s communication registers.

Automatic cleaning can help extend the period between manual maintenance operations, but it does not eliminate the need for inspection, calibration and periodic cleaning.

3. Available Measurement Parameters

Dissolved Oxygen

Dissolved oxygen measurement can be important where oxygen conditions need to be tracked continuously.

Measurement range:
0–20.00 mg/L

Resolution:
0.01 mg/L

Accuracy:
±2%

The corresponding temperature accuracy stated for the sensor module is ±0.3°C.

Turbidity

Turbidity provides information related to suspended material and changes in water clarity.

Measurement range:
0–1000.0 NTU

Resolution:
0.1 NTU

Accuracy:
±3% or ±3 NTU, whichever is greater

Temperature accuracy associated with the module is specified as ±0.3°C.

Conductivity

Conductivity measurement helps monitor changes in ionic content in water and can be useful in wastewater, process water and other online water monitoring systems.

Measurement range:
0–5000 μS/cm

Resolution:
1 μS/cm

Accuracy:
±1.5%

Temperature accuracy associated with the module is ±0.3°C.

pH

pH is one of the most commonly monitored parameters in wastewater and industrial water applications.

Measurement range:
0–14.00 pH

Resolution:
0.01 pH

Accuracy:
±0.1 pH

The associated temperature accuracy is specified as ±0.3°C.

ORP

ORP measures oxidation-reduction potential and can be used together with other water quality parameters where redox conditions need to be observed.

Measurement range:
-1500 to +1500 mV

Resolution:
1 mV

Accuracy:
±10 mV

Temperature

Measurement range:
0–50.0°C

Resolution:
0.1°C

Accuracy:
±0.3°C

These measurement specifications are based on the supplied iMP-301 technical documentation.

4. Technical Specifications

5. Designed for Long-Term Submerged Monitoring

JW-iMP-301(K33)  uses an integrated configuration rather than multiple completely independent instruments.

This offers several practical advantages where multiple parameters need to be monitored at the same sampling point:

• Fewer separate devices to install
• One RS485 communication interface
• Centralized data acquisition
• Integrated cleaning mechanism
• Easier system wiring
• Compact submerged installation
• Simplified maintenance planning

The sensor body uses POM and 316L materials and has an IP68 protection rating.

Its specified installation method is submersible installation.

For wastewater monitoring systems, this design allows several measurements to be collected continuously from the same monitoring location.

6. Protective Probe Design

Sensor elements used in continuous water monitoring can be exposed to suspended matter and physical interference.

The iMP-301 uses a protective front structure designed to help protect the internal sensing elements.

The protective section includes openings that allow water to contact the sensors while helping prevent larger suspended material or biological matter from directly damaging the sensing elements.

Each sensor also uses a quick-connect waterproof interface, making individual modules easier to remove during inspection or maintenance.

This is especially useful for multiparameter systems because different sensing elements may require different maintenance or calibration schedules.

7. RS485 Modbus RTU Communication

JW-iMP-301(K33)  uses RS485 with Modbus RTU protocol for digital communication.

The default communication format is:

• Baud rate: 9600 bps
• Data bits: 8
• Parity: None
• Stop bits: 1

The default Modbus device address is 6.

The address can be configured within the documented range of 1–127.

Measurement registers are provided for:

• Temperature
• Conductivity
• pH
• ORP
• Dissolved oxygen
• Turbidity

This makes it possible for compatible field devices to retrieve multiple measurements through one RS485 connection.

8. Typical Monitoring Architecture

JW-iMP-301(K33)  can be incorporated into a larger online water quality monitoring system.

A typical system architecture may be:

iMP-301 Multiparameter Sensor
↓
RS485 / Modbus RTU
↓
Data Logger / RTU / Controller
↓
Communication Device
↓
Monitoring Platform or SCADA System

The exact communication and data transmission equipment should be selected according to the project architecture.

For sites requiring remote monitoring, the RS485 output can be connected to a compatible telemetry or data acquisition device rather than treating the probe itself as a cloud communication device.

This distinction helps system integrators design the monitoring architecture according to the actual field requirements.

9. Wastewater Monitoring Applications

Wastewater Treatment Tanks

Wastewater treatment plants may require several parameters to be observed at the same process location.

Depending on the monitoring objective, combinations can include:

• pH
• ORP
• Dissolved oxygen
• Conductivity
• Turbidity
• Temperature

Using one multiparameter probe allows these measurements to be collected through one integrated platform.

Process Water Monitoring

Industrial water processes may need continuous monitoring where water conditions change during production, treatment or recirculation.

The RS485 Modbus interface makes the sensor suitable for integration with compatible industrial controllers and monitoring systems.

Discharge Monitoring Points

Where several supported parameters need to be observed at a fixed discharge monitoring location, a multiparameter probe can reduce the number of independent sensor assemblies.

The actual parameter combination should always be selected according to the monitoring requirement.

Water Treatment Systems

JW-iMP-301(K33)  can also be considered for treatment systems where pH, conductivity, turbidity, DO or ORP need to be monitored continuously.

The integrated cleaning brush is particularly relevant to locations where long-term submerged sensors are exposed to contamination.

Aquaculture Water Monitoring

Although this page is positioned primarily toward wastewater monitoring, the same sensing platform may also be used in aquaculture applications where supported parameters such as dissolved oxygen, pH and temperature need to be monitored.

For dedicated aquaculture projects, the final sensor combination should be selected according to the farming system and water conditions.

10. Electrical Connection

The standard electrical connection uses four wires:

• Red: 12VDC
• Black: GND
• Blue: RS485 A
• White: RS485 B

Wiring should always be checked before power is applied.

The supplied documentation specifies a cable outer diameter of approximately Ø6 mm and notes that interfaces are waterproofed.

Because cables may remain immersed in water, including seawater, or be exposed outdoors, corrosion resistance and waterproof connection practices should be considered during system installation.

11. Maintenance

The built-in cleaning brush helps extend the maintenance interval, but maintenance frequency still depends on actual water conditions.

The manual recommends regular:

• Inspection
• Cleaning
• Calibration when required

Inspection

Check:

• Sensor head for contamination
• Biological attachment
• Housing condition
• Sensor surfaces
• Cable condition
• Measurement data
• Consumable parts

Manual Cleaning

The outer sensor surface can be washed with clean tap water.

If deposits remain, use a damp soft cloth.

For persistent contamination, the manual allows a small quantity of household cleaning solution to be used with tap water.

Calibration

Depending on the installed sensing element, one-point or two-point calibration may be required.

Appropriate standard solutions should be used for each sensor.

The documentation includes individual calibration registers and procedures for conductivity, pH, ORP, dissolved oxygen and turbidity.

12. Calibration and System Integration

Because JW-iMP-301(K33)  is designed as a digital multiparameter platform, calibration and configuration can be managed through the corresponding Modbus registers.

The documentation provides individual registers for:

• Conductivity zero calibration
• Conductivity slope calibration
• pH zero calibration
• pH slope calibration
• ORP zero calibration
• ORP slope calibration
• Dissolved oxygen zero calibration
• Dissolved oxygen slope calibration
• Turbidity zero calibration
• Turbidity slope calibration

This provides system integrators with access to configuration functions without relying only on analog output signals.

13. JW-iMP-301(K33) vs Separate Water Quality Sensors

A multiparameter sensor is not automatically the right solution for every project.

Choose an Integrated Multiparameter Probe When:

• Several parameters are required at one location
• A compact submerged installation is preferred
• RS485 Modbus integration is required
• Centralized cleaning is useful
• Long-term online monitoring is planned

Consider Separate Sensors When:

• Different parameters must be installed at different depths
• Sensors require very different installation conditions
• Only one or two parameters are required
• Independent replacement is a priority
• Existing equipment already uses separate measuring points

For wastewater monitoring, the key question is therefore not only “Which sensor measures this parameter?”

It is also:

“How many parameters need to be measured at the same point, and how will they be maintained over time?”

14. How to Select the Right Configuration

Before selecting an iMP-301 configuration, provide the following project information:

1. Required parameters
2. Required measuring ranges
3. Type of water or wastewater
4. Installation location
5. Expected fouling conditions
6. Required immersion depth
7. Maintenance frequency
8. Existing RS485 / Modbus system
9. Required data logger or controller interface
10. Whether remote transmission is required

This information helps determine whether the iMP-301 is appropriate and which sensing modules should be selected.

15. Multiparameter Wastewater Monitoring with Lower Maintenance Requirements

The JW-iMP-301(K33) Multiparameter Water Quality Sensor With Self Cleaning Brush combines multiple digital sensing modules, automatic cleaning and RS485 Modbus communication in one compact submerged platform.

For wastewater and process-water projects requiring several measurements at one location, it provides a practical way to monitor:

• Dissolved oxygen
• pH
• Conductivity
• ORP
• Turbidity
• Temperature

The IP68 construction, adjustable cleaning brush and digital Modbus interface make it particularly suitable for long-term online monitoring systems where maintenance workload and system integration are important considerations.

Need Help Selecting a Configuration?

Send us:

• Required water quality parameters
• Measurement ranges
• Water or wastewater type
• Installation conditions
• Communication requirements
• Data logger / RTU / PLC information

Contact JW-IoT for sensor configuration and water quality monitoring system integration support.