Electronic Design

Universal Loop-Powered Signal Isolator Targets Multiple-Input Control Systems

The ITXPlus configurable loop-powered signal isolator from Weidmuller provides complete electrical isolation for control systems featuring a mix of inputs (see the figure). It can measure, filter, and isolate different input parameters and then convert them into an industry-standard 4- to 20-mA output. With this unique capability and slim, 12-mm profile, the ITXPlus offers savings in both I/O wiring and panel space, according to the company.

The flexible isolator can be programmed to suit a full range of common analog signals and sensor types, such as PT100, thermocouple, mV, mA, voltage, resistance, and potentiometer inputs. The standard 4- to 20-mA output can be set as direct or reverse action. Furthermore, the device’s output configurability lets users define specific characteristics like square root, linear, and x3/2, x5/2 transfer functions based on application needs.

The ITXPlus offers built-in functionality for applications requiring temperature measurements. Its output can be configured to represent virtually any temperature range within the characteristic of all industry-standard thermocouples and RTDs. Additionally, the isolator provides selectable upscale or downscale sensor-break response. The transmitter can process signals from other non-linear resistance devices, such as a negative temperature coefficient (NTC), positive temperature coefficient (PTC), or log potentiometer, providing added value across numerous applications.

In addition, the ITXPlus features a user-definable, user-programmable characteristic table that contains up to 101 measurement values. This is especially helpful when measuring levels with nonlinear tank shapes. Measurements are delivered with excellent accuracy, Weidmuller claims, making the ITXPlus ideal for virtually all process instrumentation applications.

If a sensor is replaced, the ITXPlus can be easily reconfigured with the user-friendly configuration software (TSET), which runs on any PC/laptop. Users can even connect and reconfigure the ITXPlus while it is in active operation, preventing costly system downtime. The configuration file can then be saved and printed for each serial or tag number as a backup or for future reference. The software also permits easy ITXPlus data logging onto the PC. The ITXPlus is DIN-rail mountable and cULus approved as well.



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