Grundfos DID – Dosing Instrumentation Digital Water Quality Measurement & Control
The Grundfos DID (Dosing Instrumentation Digital) systems represent the perfect combination of s::can’s state-of-the-art digital sensor technology and Grundfos’ expertise in PID controlling of dosing and disinfection processes. Capable of measuring and controlling up to 3 water quality parameters simultaneously, DID systems are designed to match perfectly with Grundfos dosing pumps, gas dosing systems, and systems for the generation and dosing of chlorine dioxide and hypochlorite. Monitoring typical water quality parameters and precise control of disinfectant addition or pH adjustment is essential for many water treatment processes.
As an authorized Grundfos Water Pump Dealer in Dubai, we supply the complete DID range with genuine warranty and technical support across the UAE.
CU 382 Control Unit Specifications
| Parameter | Specification |
|---|---|
| Electronics | High-speed 32 bit Cortex M4 processor |
| Display | 128 x 64 graphical display, 70 x 40 mm viewing area, transreflective, white background |
| Memory | 512 MB, industrial grade SLC |
| Data Logger | Internal memory, downloadable via USB stick |
| Interfaces | RS-485 Modbus |
| Ambient Temperature | -20 to +45°C |
| Permissible Relative Humidity | 5 to 90%, non-condensing |
| Voltage | 100-240 V, 50/60 Hz |
| Enclosure Class | IP65 |
CU 382 Outputs & Inputs
| Type | Quantity | Description |
|---|---|---|
| Analog Outputs | 3 x 4-20 mA | Freely assignable controller outputs |
| Analog Input | 1 x 4-20 mA | External signal input |
| Potential-Free Outputs | 2 | Digital control outputs |
| Alarm Relay | 1 | Fault notification |
| Potential-Free Inputs | 2 | External signal inputs |
Sensor Specifications
Disinfectant Sensors
| Parameter | Free Chlorine | Total Chlorine | ClO₂ | H₂O₂ | PAA |
|---|---|---|---|---|---|
| Operating Temperature | +5 to +45°C | +5 to +45°C | +5 to +50°C | +5 to +45°C | +5 to +45°C |
| Max. Operating Pressure | 3 bar | 3 bar | 1.0 bar | 1.0 bar | 1.0 bar |
| Min. Flow Rate | 30 l/h | 30 l/h | 30 l/h | 30 l/h | 30-100 l/h |
| Response Time (t90) | 2 min | 2 min | 1 min | 8 min | 5 min at 10°C / 1.5 min at 50°C |
| Measuring Range | 0-2 ppm / 0-20 ppm | 0-2 ppm / 0-20 ppm | 0-2 ppm / 0-20 ppm | 0-200 ppm / 0-2000 ppm | 0-200 ppm / 0-2000 ppm |
Water Quality Sensors
| Parameter | pH | ORP | Conductivity |
|---|---|---|---|
| Operating Temperature | 0 to +70°C | 0 to +70°C | 0 to +70°C |
| Max. Operating Pressure | 0-10 bar | 0-10 bar | 0-20 bar |
| Min. Flow Speed | 0.01-3 m/s | 0.01-3 m/s | 0.01-3 m/s |
| Response Time (t90) | 30 s | 30 s | 60 s |
| Measuring Range | pH 2-12 | -2000 to +2000 mV | 0-500000 µS/cm |
System Configuration Options
Bypass Flow Cell Systems
Intended for monitoring and control of:
| Parameter | Application |
|---|---|
| Free Chlorine | Drinking water disinfection |
| Total Chlorine | Swimming pool treatment |
| ClO₂ | Chlorine dioxide monitoring |
| pH | Acid/base dosing control |
| ORP | Oxidation-reduction potential |
| Conductivity | Water quality monitoring |
| Temperature | Process temperature tracking |
Bypass System Features:
- Water flow maintained at appropriate level by flow restrictor
- Flow switch detects lack of water and triggers alarm
- Shut-off ball valve included
- Sampling cock for manual testing
- Compatible with Grundfos standard hoses
Tank Immersion Systems
Available with up to 2 sensors for:
| Sensor Options | Application |
|---|---|
| pH Sensor | Direct tank pH measurement |
| ORP Sensor | Direct tank ORP measurement |
| Conductivity Sensor | Direct tank conductivity |
| Temperature | Always included |
Tank Immersion Features:
- Direct measurement in tank or basin
- No bypass line required
- No flow cell needed
- 7.5 m cable included (extensions up to 20 m available)
- Sensor carrier and guard included
- Wall mount or DIN rail mounting options
CU 382 Control Unit Features
Intuitive Plain-Text Operation
User-friendly interface with clear menu navigation for easy setup and operation.
Data Logger Functionality
Internal memory stores measurement data, downloadable via USB stick for analysis and documentation.
Up to 3 Controller Outputs
Three freely assignable 4-20 mA outputs for controlling multiple dosing pumps or systems simultaneously.
Modbus Communication
- RS-485 Modbus interface included
- Modbus sensor interface for digital sensors
- Integration with SCADA and BMS systems
Data Interchange
USB stick compatibility for easy data transfer and configuration backup.
Wide-Range Power Supply
100-240 V, 50/60 Hz universal power supply for global installation flexibility.
Sensor Features
Digital Modbus Interface
All sensors communicate with CU 382 control unit via Modbus protocol for reliable digital signal transmission.
Onboard Calibration Storage
Calibration data stored directly in each sensor, maintaining accuracy after sensor replacement.
Temperature Compensation
Automatic temperature compensation included for all sensors, ensuring accurate measurements across operating temperature range.
Pre-Calibrated Sensors
pH, ORP, and conductivity sensors arrive pre-calibrated, reducing commissioning time.
Long Service Intervals
Designed for extended operation between maintenance, minimizing operational costs.
Diaphragm-Covered Amperometric Principle
Disinfectant sensors use advanced amperometric measurement technology for accurate chlorine and oxidant detection.
Low pH Dependency
Free-chlorine sensors feature low pH dependency for accurate measurement across varying pH conditions.
Installation Configurations
DID with Bypass Flow Cell
| Component | Description |
|---|---|
| 1 | DID with bypass flow cell |
| 2 | SMART Digital dosing pump |
| 3 | Dosing tank |
| 4 | Sample water extraction |
| 5 | Sample water outlet to drain |
| 6 | Bypass flow cell (1 or 3 sensors) with sample water extraction |
| 7 | Flowmeter |
| 8 | Signal cable to CU 382 control unit |
| 9 | CU 382 control unit |
| 10 | Control cable to pump |
| 11 | Dosing line |
| 12 | Injection unit |
DID for Tank Immersion
| Component | Description |
|---|---|
| 2 | SMART Digital dosing pump |
| 3 | Dosing tank |
| 9 | CU 382 control unit |
| 10 | Control cable to pump |
| 11 | Dosing line |
| 13 | Tank |
| 14 | Sensor with carrier and guard |
| 15 | Signal cable: sensor to CU 382 control unit |
Measured Parameters Overview
| Parameter | Sensor Type | Primary Applications |
|---|---|---|
| Free Chlorine | Amperometric | Drinking water, pool disinfection |
| Total Chlorine | Amperometric | Combined chlorine monitoring |
| Chlorine Dioxide (ClO₂) | Amperometric | ClO₂ disinfection systems |
| Hydrogen Peroxide (H₂O₂) | Amperometric | Advanced oxidation processes |
| Peracetic Acid (PAA) | Amperometric | Food & beverage disinfection |
| pH | Electrochemical | Acid/base dosing control |
| ORP | Electrochemical | Oxidation potential monitoring |
| Conductivity | Electrochemical | TDS and salinity monitoring |
| Temperature | Integrated | Process temperature monitoring |
Applications
Drinking Water Treatment
- Chlorine disinfection control
- pH adjustment
- Chlorine dioxide dosing
- Water quality monitoring
Swimming Pool & Spa
- Free chlorine control
- pH regulation
- ORP monitoring
- Conductivity tracking
Industrial Water Treatment
- Process water conditioning
- Cooling tower treatment
- Boiler water monitoring
- Wastewater pH control
Food & Beverage
- CIP (Clean-in-Place) systems
- Peracetic acid dosing
- Sanitization processes
- Rinse water quality
Pharmaceutical & Healthcare
- Ultrapure water systems
- Disinfection control
- Water quality documentation
- Regulatory compliance
System Selection Guide
| Application | Recommended Configuration | Sensors |
|---|---|---|
| Pool chlorination | Bypass flow cell | Free chlorine + pH |
| Drinking water | Bypass flow cell | Free chlorine + pH + temperature |
| Industrial cooling | Tank immersion | Conductivity + pH |
| ClO₂ disinfection | Bypass flow cell | ClO₂ + ORP |
| Wastewater pH control | Tank immersion | pH + ORP |
| Food processing | Bypass flow cell | PAA + conductivity |
Compatible Grundfos Dosing Equipment
DID systems integrate seamlessly with:
| Equipment Type | Examples |
|---|---|
| Digital Dosing Pumps | DDA, DDC, DDE SMART Digital series |
| Gas Dosing Systems | Chlorine gas systems |
| Generation Systems | Chlorine dioxide generators |
| Hypochlorite Systems | On-site generation systems |
Why Choose Grundfos DID?
State-of-the-Art Digital Sensors
s::can sensor technology delivers accurate, reliable measurement with digital Modbus communication.
Powerful PID Control
Grundfos expertise in dosing control ensures precise chemical addition and optimal process performance.
Complete System Integration
Designed for seamless operation with Grundfos dosing pumps and chemical generation systems.
Flexible Installation
Choose bypass flow cell for inline measurement or tank immersion for direct tank monitoring.
Industrial Protection
IP65-rated control unit operates reliably in demanding water treatment environments.
Data Documentation
Built-in data logger with USB download capability supports quality documentation and regulatory compliance.
Grundfos Accessories & Parts
Maintain optimal DID system performance with original components including replacement sensors (pH, ORP, chlorine, conductivity), calibration solutions, flow cells, sensor cables, extension cables, sensor guards, carriers, and membrane caps. We stock parts for all DID system configurations.
Select Grundfos Pumps
Browse our complete inventory of Grundfos DID dosing instrumentation systems. As Grundfos Pump Suppliers in Dubai, we provide competitive pricing, technical consultation, system design support, and prompt delivery across Dubai, Sharjah, Abu Dhabi, Ajman, and all UAE locations.
Contact us for:
- System configuration based on your water quality parameters
- Bypass flow cell vs tank immersion recommendations
- Sensor selection guidance
- Integration with existing dosing systems
- Competitive quotations
- Delivery schedules
Measurement and Control of Up to 3 Water Quality Parameters
The Grundfos DID system combines advanced digital sensor technology with proven PID control expertise to deliver precise water quality measurement and chemical dosing control. With sensors for free chlorine, total chlorine, ClO₂, H₂O₂, PAA, pH, ORP, and conductivity—plus the powerful CU 382 control unit featuring Modbus communication, data logging, and IP65 protection—DID provides the complete measurement and control solution for drinking water, pools, industrial processes, and beyond.