Description
QEED Loop-Powered AC/DC Current Transducer
QI-50-I AC/DC TRMS Current Transformer
The QEED QI-50-I is an AC/DC current transformer and transducer designed to measure DC current and AC TRMS current. It is galvanically isolated from the measured circuit and provides a standard 4 20mA loop-powered output.
Unlike standard active current transformers, the QI-50-I can measure both AC TRMS and DC current. As a loop-powered device, it does not require a separate auxiliary power supply, making it suitable for PLC, SCADA, BMS, EMS, data logger and industrial monitoring applications.
Measurement
AC TRMS and DC current
Output
4 20mA loop-powered
Range
25A / 50A selectable
Accuracy
0.5% F.S.
Overview
QI-50-I is suitable for current measurement applications where a simple 4 20mA signal is preferred. It can be connected directly to analogue input cards, PLCs, remote I/O modules, process controllers, data loggers and monitoring systems.
The transducer is especially useful for AC/DC current monitoring in battery systems, UPS, DC power panels, motor control, machinery, industrial automation and energy management systems.
Positioning: Compact isolated AC/DC current transducer with passive 4 20mA loop-powered output for industrial current monitoring.
Key Features
AC/DC Current Measurement
Measures DC current and AC TRMS current, unlike standard AC-only current transformers.
Loop-Powered Output
Powered directly from the 4 20mA current loop, reducing wiring and eliminating separate power supply.
Selectable Current Range
25A or 50A scale can be selected by DIP switch according to application requirement.
Monopolar / Bipolar Mode
Select monopolar TRMS mode or bipolar mode for positive and negative DC current applications.
Isolated Measurement
Provides 3kV isolation on bare wire between primary current path and measurement output.
Flexible Mounting
Supports screw mounting or DIN rail clips for horizontal or vertical panel installation.
Measurement and Output Functions
| Function |
Specification |
Purpose |
| Current Measurement |
AC TRMS or DC current |
Monitor AC/DC current in industrial systems and DC applications |
| Selectable Range |
50 Arms or 25 Arms; bipolar ±50A DC or ±25A DC |
Match device scale to the current level being measured |
| Output |
4 20mA passive loop-powered output |
Connection to PLC analogue input, data logger, remote I/O or monitoring system |
| Mode Selection |
Monopolar TRMS or bipolar mean-value mode |
Select correct output behaviour for AC or DC application |
Bipolar note: When bipolar mode is used on AC current, the output may read around the midpoint because the device is reading the average value.
Technical Specifications
| Parameter |
Specification |
| Power Supply |
Passive loop-powered, 11 to 30V, with polarity reversal and over-temperature protection |
| Absorption |
Less than 3.5mA |
| 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 |
| Type of Measure |
TRMS, monopolar |
| Range |
50 Arms or 25 Arms by DIP switch; bipolar ±50A DC or ±25A DC |
| Output |
4 20mA |
| 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 5.08mm terminals |
| DIP Switch |
2-pole DIP switch |
| LED |
1 yellow LED for power-on indication |
| Standards |
EN55022:2010-12; EN55024:2010-11 |
| Dimensions |
46.1 x 63 x 26.4mm, terminal excluded |
DIP Switch Configuration
QI-50-I includes two DIP switches for local configuration. These switches allow selection of the current range and measurement mode.
- Select 25A or 50A measurement scale
- Select monopolar TRMS mode or bipolar mode
- Use the yellow LED to confirm loop power presence
- Switch off the power supply before changing DIP switch settings
Configuration note: Any DIP-switch change requires the power supply to be switched off first. This prevents unwanted changes during operation.
Typical Applications
Battery Systems
Measure charge and discharge current in DC battery applications using a 4 20mA signal.
UPS and DC Power
Suitable for UPS, telecom DC power and backup power monitoring systems.
DC Motor Control
Monitor DC motor current and provide analogue current feedback to control systems.
PLC / SCADA
Connect directly to analogue input cards for PLC, SCADA, BMS or EMS applications.
Industrial Automation
Use in machinery, control panels and process systems where AC/DC current feedback is required.
IoTWatt 4.0
Can be integrated into IoTWatt 4.0 through compatible analogue input modules or remote I/O systems.
Installation Note
The current transformer can be mounted in any position using screw fixing or the included DIN rail clips. It can be installed horizontally or vertically depending on panel layout and conductor routing.
High-intensity magnetic fields can change the measured values. Avoid installation near permanent magnets, electromagnets or iron masses that may induce strong magnetic changes. If irregular measurement is observed, reorient or move the transducer to a better position.
Wiring note: As the QI-50-I is loop-powered, confirm the available loop supply voltage, PLC input type and loop resistance before installation.
System Integration
QI-50-I is suitable for installations where a standard industrial 4 20mA signal is required. The output can be connected to analogue input modules, PLC cards, remote I/O, data loggers, controllers, BMS, EMS or industrial IoT systems.
- Use 4 20mA input for long-distance analogue signal transmission
- Connect to PLC, SCADA, EMS, BMS or data logger analogue inputs
- Use compatible analogue input modules for IoTWatt 4.0 integration
- Confirm monopolar or bipolar mode based on the AC/DC application
- Verify 4 20mA scaling during commissioning
QI-50-I Supply and Integration
Saturn Pyro supports QEED QI-50-I AC/DC loop-powered current transducers for battery monitoring, UPS, DC systems, motor control, automation panels, PLC analogue input, 4 20mA monitoring and IoTWatt 4.0 projects in Malaysia.
Enquire Now
More detail about Saturn Pyro Sdn Bhd
Malaysia
