PA420

Liquid level preamplifier and transmitter

A two-wire, loop-powered 4–20 mA liquid level preamplifier and transmitter.

Product Description

Because "PA420" refers to different technical products depending on the manufacturer, it most commonly describes the Spirax Sarco PA420 Preamplifier, a loop-powered 4–20 mA level transmitter used with capacitance probes in industrial boilers and tanks. Alternative meanings include a digital mini clamp meter, a process indicator, or a state relay.

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