TxIsoLoop-2 can be used to split a single 4-20mA signal into two separate output channels — simple wiring for fast installation, output powered from the input loop, high accuracy, galvanic isolation, and high reliability. It's popular for PLC applications such as hardware upgrades and asset replacement where two control systems need to read the same 4-20mA input, allowing simple and cost-effective signal splitting.
When duplicating one input signal into two outputs, an external 24VDC power supply is required at terminals 3 and 7.
It can also function as two independent loop isolators. With the wiring configuration below, no external power is required.
TxIsoLoop-1 and TxIsoLoop-2 simplify your application and avoid undesirable ground loops by providing single and dual loop galvanic isolation. The 0/4-20mA input is measured and an identical isolated signal is reproduced at the output.
Recommended for electrical grids where the electric potential difference is a major risk, the TxIsoLoop galvanic isolator works on up to 2 isolated channels and eliminates ground loops, which ensures accuracy and signal safety. This accessory, indispensable for industrial environments, operates with a response time of only 2ms.
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Novus TxIsoLoop Datasheet Download
Novus TxIsoLoop Manual Download
Technical Details
Maximum input voltage: 32 Vdc. Voltage drop: <3 Vdc
Output signal: 0(4) to 20mA. Max load: 1450Ω
Accuracy: 0.2% FS @ 0-60°C / RL=250Ω; 0.3% FS @ -20-75°C / RL=250Ω
Operating current: >0.1mA. Overload: <40mA; <32Vdc
Response time: 2ms @ RL=250Ω
Isolation: 3000Vac / 10s; 240Vac continuous. EMC: EN 61326-1
Ambient temperature range: -20 to +75°C. Humidity: 20-90% RH. Protection: IP40
Wire gauge for connections: 0.14 to 1.5mm². Recommended torque: 0.8Nm. Terminal blocks injected in Polyamide
Dimensions: 18mm wide, 72mm deep when DIN rail mounted
Frequently Asked Questions
Does the device require external power?
To split one 4-20mA signal into two outputs, 24VDC is required. In standard isolation mode, the device does not require external power.
Are there any DIP switches to set?
No — this device is very simple to set up.
Does the TxIsoLoop-2 failsafe or provide any error signal?
In the event of an error the outputs will be zero (not 4mA), so you can distinguish between a low-end signal and a genuine fault.
Industry Applications
- Signal Splitting for Upgrades — feeds one 4-20mA signal to two control systems during hardware transitions.
- Ground Loop Elimination — dual independent isolators protect signal accuracy on installations with electric potential differences.
- Asset Replacement Projects — lets old and new control systems read the same input during commissioning.