Description
QEED Current Signal Isolator
QA-I Current Isolator
The QEED QA-I is a 3-way current signal isolator for 0 20mA and 4 20mA analogue signals. It introduces galvanic isolation between input, output and power supply, helping to reduce ground loop issues, signal interference and reference potential problems in industrial control systems.
QA-I does not require programming. The input current signal is isolated and retransmitted at the output. Both input and output can be configured as active or passive, making the module suitable for different PLC, controller, transmitter and monitoring system wiring arrangements.
Signal Type
0 20mA / 4 20mA current signal
Isolation
3-way galvanic isolation, 1.5kV
Input / Output
Active or passive current loop
Mounting
17.5mm DIN rail module
Overview
QA-I is used when an analogue current signal must be passed from one system to another while maintaining electrical separation. It is suitable for isolating signals between field transmitters, PLC analogue inputs, controllers, recorders, BMS panels, EMS panels and industrial monitoring systems.
The module is especially useful where signal instability is caused by electrical noise, ground loops, different power supply references or long cable runs. By adding galvanic isolation, the signal can be made more stable and safer for the receiving system.
Positioning: Compact 3-way isolated 0 20mA / 4 20mA current signal isolator for PLC, SCADA, BMS, EMS and industrial automation panels.
Key Features
No Programming Required
The input current signal is isolated and made available at the output without software configuration.
Active / Passive Input
Input can be wired as active or passive depending on field transmitter and loop design.
Active / Passive Output
Output can be wired as active or passive to match the receiving analogue input system.
3-Way Isolation
Analogue input, analogue output and power supply are galvanically isolated at 1.5kV.
High Accuracy
0.1% F.S. accuracy and 16-bit resolution for precise analogue signal retransmission.
DIN Rail Mounting
Compact DIN rail module with removable terminals for clean panel installation.
Input and Output
| Function |
Specification |
Typical Use |
| Current Input |
Active or passive current input, up to 20mA, 20Ω input impedance, max resolution 2 礎 |
Connection from transmitter, analogue output module or field signal |
| Current Output |
Active or passive current output, up to 20mA, maximum load resistance 600Ω |
Isolated signal to PLC, BMS, EMS, controller, recorder or monitoring system |
| Isolation Function |
Input current value is reproduced at the output with galvanic separation |
Ground loop removal, signal protection and electrical separation |
3-Way Isolation
The QA-I provides galvanic isolation between the analogue input, analogue output and power supply. This 3-way isolation is important in control panels where the field instrument, PLC and auxiliary power supply may not share the same electrical reference.
Isolation paths: Analogue input, analogue output and power supply are 3-way galvanically isolated at 1.5kV.
LED Indication
| LED |
Indication |
| Power |
Indicates the presence of power supply on the module. |
| Fail |
Indicates a malfunction, hardware problem, over-range / under-range condition or incorrect electrical connection. |
Technical Specifications
| Parameter |
Specification |
| Power Supply |
10 to 40Vdc or 20 to 28Vac, 50/60Hz |
| Input |
Active or passive current input, up to 20mA |
| Output |
Active or passive current output, up to 20mA |
| Maximum Load Resistance |
600Ω on current output |
| Input Impedance |
20Ω |
| Maximum Resolution |
2 礎 |
| Absorption |
Maximum 2VA |
| Protection Index |
IP20 |
| Accuracy |
0.1% F.S. |
| Resolution |
16-bit |
| Rejection |
50 60Hz |
| Thermal Stability at 25°C |
<100ppm / °C |
| Working Temperature |
-15°C to +65°C |
| Storage Temperature |
-40°C to +85°C |
| Isolation |
Analogue input, analogue output and power supply are 3-way galvanically isolated at 1.5kV |
| Humidity |
10% to 90%, non-condensing |
| Altitude |
Up to 2000m a.s.l. |
| Mounting |
DIN rail mounting with removable terminals |
| Connections |
Removable 5.08mm terminals |
| CE Standards |
EN61000-6-4:2006 + A1:2011; EN61000-6-2:2005; EN61010-1:2010 |
| Dimensions |
17.5 x 100 x 112mm, terminals excluded |
Correction note: The old page contained “retransmission output” text copied from converter models. For QA-I, the core function is current signal isolation and retransmission, not programmable voltage/current conversion.
Typical Applications
PLC Signal Isolation
Isolate 4 20mA signals before connection to PLC analogue input cards.
Ground Loop Reduction
Reduce analogue signal instability caused by ground loops or different electrical references.
Field Transmitters
Isolate signals from pressure, flow, temperature, level or other current-loop transmitters.
BMS and EMS Panels
Use for clean current-loop signal transfer into building and energy management systems.
SCADA Integration
Protect and isolate analogue measurement signals before connecting to SCADA systems.
IoTWatt 4.0
Useful where isolated 4 20mA signals are connected into compatible IoTWatt 4.0 input modules.
Mounting Instructions
QA-I is designed for DIN rail mounting. To install the module, place the upper part of the module onto the edge of the omega rail and push the lower part until it clicks into place. The fastening slider should be pushed forward to secure the module firmly on the rail.
Installation note: Confirm active/passive wiring, loop supply, polarity and load resistance before energising the loop. Incorrect wiring may trigger the fail indication or produce an unstable signal.
System Integration
QA-I is suitable for isolating analogue current-loop signals in PLC, SCADA, EMS, BMS, process control, utility monitoring and industrial IoT systems. It is normally installed between the signal source and the receiving analogue input.
- Use between field transmitter and PLC analogue input
- Use between PLC analogue output and receiving controller
- Use to isolate signals entering BMS or EMS panels
- Use to reduce ground loop and common-mode signal issues
- Use with compatible input modules for IoTWatt 4.0 integration
QA-I Supply and Integration
Saturn Pyro supports QEED QA-I current isolators for 0 20mA and 4 20mA signal isolation, PLC analogue input protection, SCADA, BMS, EMS, process monitoring and IoTWatt 4.0 projects in Malaysia.
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More detail about Saturn Pyro Sdn Bhd
Malaysia
