Design

The channels of the analog annunciator unit measure voltage, current and resistance via

sensors or transducers in the process. Further, contact signals can be wired to the input

channels. The signal type can be separately set for each channel.

The channel inputs are galvanically separated from earth and from the digital part of the

annunciator electronics, but the channels are galvanically interconnected. This arrange

ment facilitates the supervision and the indication of earth faults in the transducers or the

transducer wiring.

The alarm channel inputs accept the following signal levels: 0 5 mA, 1 5 mA, 0 20 mA and

4 20 mA, 0 1 V, 0 5 V, 1 5 V, 0 10 V and 2 10 V. The following standard sensors types can

be used for temperature measurement: Pt 100. Pt 250.Pt 1000. Ni 100. Ni 120. Ni 250.

Ni 1000.

Further, any Pt or Ni signal within the range 65 1000 Ω, potentiometric signal within the

range 0 200 Ω, 0 500 Ω, 0 1 kΩ, 0 2 kΩ, 0 2.5 kΩ, 0 10 kΩ can be used and scaled.

For the resistance sensors two- or three-wire connection can be used.

In addition, the input channels can be activated by a making or a breaking contact.

The values measured can be shown as numerical values, bar graphs or curves on the dot

matrix display on the front panel. The same information can also be read by a superior

system via the serial interface.

The content of the event sequence register can be read on the display. The total system

can be configured by means of the push-buttons and the display on the front panel, or via

the serial interface.

When a measured signal exceeds or fallsbelow the set start value of the channel avisual

indication is obtained on the alarmpanel. At the same time the acoustic alarmoutput contact

picks up and, if configured, agroup alarm relay operates. The event thusgenerated is stored

in the event register.

Any information generated in the annunciatorunit can be read by a hierarchically superiorsystem

via the serial interface.