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A compact dual-channel AC current/voltage transmitter with true RMS measurement and three-way isolation for reliable PLC/DCS integration.
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QD89UI AC Current and Voltage Transmitter
QD89UI is a combined current and voltage transmitter designed around “Current & Voltage Measurement in One Module.” Independent current and voltage measurement channels allow two electrical variables to be acquired within one compact device. This integrated structure helps reduce the number of separate measurement modules required in power monitoring and industrial control applications.
QD89UI provides independent output channels for current and voltage measurements. Standard 4–20mA outputs allow both measured variables to be transmitted separately to downstream monitoring and control equipment, while 0–5V and 0–10V voltage outputs are available as options. This makes the transmitter easier to integrate with PLC, DCS and industrial data acquisition systems.
QD89UI uses three-way galvanic isolation between the AC input circuit, DC output circuit and auxiliary power supply. A 2500V AC withstand level provides additional electrical separation between field measurement and downstream control circuits, helping reduce the influence of common-mode interference and ground potential differences.
Working Principle Diagram
