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QEED AC/DC Current Transducer
QI-50-V-485 AC/DC TRMS Current Transformer
The QEED QI-50-V-485 is an isolated AC/DC current transducer designed to measure DC current and AC TRMS current. It provides both RS485 Modbus RTU communication and a 0–10V analogue output, making it suitable for automation, monitoring, energy systems and industrial measurement applications.
The device functions like an active current transformer but can also measure the DC component. It supports configurable span, zero and Modbus address settings through RS485 or the free FACILE QI-50-V-485 software.
Measurement AC TRMS and DC current
Range 25A / 50A selectable
Outputs RS485 Modbus + 0–10V
Isolation 3kV on bare wire
Overview
QI-50-V-485 is suitable for applications where both AC and DC current values need to be monitored from one compact device. It is galvanically isolated from the measuring circuit and can be used in electrical panels, DC systems, UPS, battery systems, machinery, motor control and automation systems.
The device provides a 0–10V analogue output for direct connection to analogue input systems and RS485 Modbus RTU for digital integration with PLC, SCADA, EMS, BMS, data logger, Modbus gateway, IoT gateway or IoTWatt 4.0.
Positioning: Compact isolated AC/DC current transducer with analogue output and RS485 Modbus RTU for industrial current monitoring and automation integration.
Key Features
AC/DC Current Measurement
Measures both DC component and AC TRMS current, unlike standard AC-only current transformers.
Dual Output
Provides 0–10V analogue output and RS485 Modbus RTU serial output from the same device.
Selectable Range
Current scale can be set to 25A or 50A using DIP switch configuration.
Configurable Span and Zero
Span, zero and Modbus address can be configured through RS485 or FACILE software.
Monopolar / Bipolar Mode
Can be configured for monopolar TRMS or bipolar mean-value measurement applications.
DIN Rail or Screw Mounting
Supports horizontal or vertical mounting using screw holes or included DIN rail clips.
Measurement and Output Functions
| Function |
Specification |
Purpose |
| Current Measurement |
AC TRMS or DC current measurement |
Monitor AC/DC current in industrial and energy systems |
| Selectable Range |
50 Arms or 25 Arms; bipolar ±50A DC or ±25A DC |
Match device range to application current level |
| Analogue Output |
0–10V |
Connection to analogue input modules, PLCs or monitoring systems |
| Serial Output |
RS485 Modbus RTU |
Digital communication with SCADA, EMS, BMS, PLC and IoT systems |
| Configuration |
Span, zero and Modbus address configurable |
Commissioning and system calibration |
Technical Specifications
| Parameter |
Specification |
| Power Supply |
12 to 30Vdc, with protection against polarity reversal and over-temperature |
| Absorption |
Max 20mA |
| Protection Index |
IP20 |
| Accuracy |
0.5% F.S. |
| Resolution |
12-bit |
| Temperature Coefficient |
< 200 ppm / °C |
| Working Temperature |
-15°C to +65°C |
| Storage Temperature |
-40°C to +85°C |
| Response Time |
1000ms on analogue output; 30ms on serial output |
| Type of Measure |
TRMS, monopolar |
| Range |
50 Arms or 25 Arms by DIP switch setting; bipolar ±50A DC or ±25A DC; RS485 custom setting |
| Output |
0–10V and RS485 |
| Bandwidth at -3dB |
DC or 20 to 2000Hz |
| Isolation |
3kV on bare wire |
| Overload |
2000A pulse, 300A continuous |
| Crest Factor |
2 |
| Hysteresis |
0.15% F.S. |
| Humidity |
10% to 90%, non-condensing |
| Altitude |
Up to 2000m a.s.l. |
| Weight |
72g |
| Filling |
Epoxy resin |
| Box Material |
PBT, grey |
| Mounting |
Screw mounting or DIN rail clips, horizontal or vertical |
| Terminal |
Removable 3.5mm terminal, 5 poles |
| DIP Switch |
8-pole DIP switch |
| LED |
1 yellow LED: fixed for power on, blinking for data communication |
| Standards |
EN55022:2010-12; EN55024:2010-11 |
| Dimensions |
46.1 x 63 x 26.4mm, terminal excluded |
Configuration
QI-50-V-485 can be configured through RS485 using a USB / RS232 / RS485 converter and the free FACILE QI-50-V-485 software. The same configuration can also be done from a supervisory system using Modbus registers.
- Set Modbus address
- Configure zero and span
- Select 25A or 50A range
- Select monopolar TRMS or bipolar mean-value mode
- Set scale and output relationship
- Use DIP switches for quick local configuration
- Use RS485 for customised settings and system integration
Configuration note: DIP-switch changes require the power supply to be switched off before changing the setting. This is a safety condition to avoid unwanted changes during operation.
Typical Applications
Battery Systems
Monitor AC/DC current in battery charging, discharge and low-voltage DC power circuits.
UPS and DC Power
Useful for UPS, telecom power, DC distribution and backup power monitoring.
DC Motor Control
Measure current in DC motor circuits and control panels.
Industrial Automation
Use 0–10V or RS485 output for PLC, SCADA and machine monitoring systems.
Energy Monitoring
Integrate current measurements into EMS, BMS, datalogger and IoT systems.
IoTWatt 4.0
Can be connected through compatible RS485 gateways for dashboarding and analytics.
Installation Note
High-intensity magnetic fields can change the values measured by the transducer. Avoid installation near permanent magnets, electromagnets or iron masses that may induce strong changes in the magnetic field. If irregular measurement is observed, reorient or relocate the transducer to a more suitable position.
Mounting: The current transducer can be mounted horizontally or vertically using screw fixing or the included DIN rail clips.
System Integration
QI-50-V-485 is suitable for applications where both analogue and digital current signals are required. The 0–10V output can connect to analogue input cards, while RS485 Modbus RTU can be used by PLC, SCADA, EMS, BMS, Modbus gateway, IoT gateway or IoTWatt 4.0 systems.
- Use 0–10V for simple analogue monitoring
- Use RS485 Modbus RTU for digital data integration
- Use unique Modbus addresses for multiple transducers on the same bus
- Verify output scaling and polarity during commissioning
- Confirm monopolar / bipolar mode based on AC or DC application
QI-50-V-485 Supply and Integration
Saturn Pyro supports QEED QI-50-V-485 AC/DC current transducers for battery monitoring, UPS, DC systems, motor control, automation panels, RS485 Modbus integration, analogue signal monitoring and IoTWatt 4.0 projects in Malaysia.
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