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HomeProductsProduct categoriesStationary metersEX environment > Isolated amplifier WG 21 A7

Isolated amplifier WG 21 A7

EX environment isolated amplifier WG 21 A7

The isolated amplifier WG 21 supplies the intrinsically safe monitor with auxiliary energy and transfers the measured value. Can be integrated into the IQ Sensor Net

  • Highest safety, even at high ambient temperatures
  • Safe separation and isolation of input, output and auxiliary power
  • Can be connected to the IQ Sensor Net

The isolated amplifier is installed outside the zone and supplies the monitor within the zone with its own intrinsic power circuit. In addition, it transfers the meaured value via an mA output or via HART (optional). The WG 21 is also available with a 24 V AC/DC auxiliary voltage and can therefore be integrated into the IQ Sensor Net.


Model Description Order no.
WG21A7 Isolated amplifier 109 446 EX
WG21A7 Opt. 336 Isolated amplifier, with auxiliary voltage 24 V AC/DC 109 447 EX
WG21A7 Opt. 470 Isolated amplifier, with HART® communication 109 448 EX
WG21A7 Opt. 336,470 Isolated amplifier, with auxiliary voltage 24 V AC/DC and HART® communciation 109 449 EX

Technical Data

Feed measuring circuit Intrinsic feed voltage ≥ 18V
Output 4 … 20mA
Model Modular housing A7, with snap-on closure for hat rail 35 mm according to DIN EN 50022
Protection class IP40, clamps IP20
Explosion proof II (1)G [Ex ia Ga] IIC
EMV EN 61326-1



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