LEM has introduced the ATVR series of voltage transducers for ture RMS measurement of AC voltage at 120V,250V and 400V.

The new series provides +1 per cent measurement accuracy and galvanic isolation between the primary and secondary circuits of up to 2.5kV.  The bandwidth 40Hz to 5KHz and the response time is below 250ms.  Lineanity error is better than 0.5%.  The 4-20mA loop powered is suitable for many type of control board.  The case is DIN-rail mounting at 22.5mm with finger-safe terminals.

The ATVR series is particularly suitable for applications where the voltage measurement must be more accurate than a monitoring relay.  The true RMS function also provides an accurate measurement of pulsed or noisy signals, such as those close to a variable frequency drive.