Weidmuller DPADRT - Universal glavanically isolated signal co Manual do Utilizador descarregar pdf (Página 16)

DPA/DRT

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Operation

General

The DPA/DRT allows you to monitor the difference between two

resistance values using two independent trip points. They are, typically,

used to monitor the difference in temperatures measured by two Pt100

RTDs, the only restriction being that the temperature measured by R

must be greater than the temperature measured by R

Setup

The alarm relay coils operate according to each setpoint/deadband

configured via front panel multiturn potentiometers. Internal push

fit jumpers determine the alarm type (high or low acting) and coil

energisation (normally energised/de-energised).

DPA/DRT block diagram.

Alarm 1

Power

Supply

Alarm 2

Differential

Resistance

Note: R1 must be

greater than R2

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