Month: July 2026

The annunciator unit provides immediate fault recognition, fault

identification and visual and audible alarm in an abnormal process

situation. The annunciator unit also provides a means for subsequent

fault analyses, which means that corrective measures can be carried

out without delay and you maintain full control of the process.

The annunciator units can be used as independent stand-alone units,

or several units can be interconnected and connected to printers,

terminals, etc., to form complete supervision, event sequence reporting

and data acquisition systems. The maximum annunciator system capacity

is 560 channels in one system and the resolution of the time marking is

10 milliseconds.

Scope

• Self-contained microprocessor-based annunciator unit with 64 alarm

channels

Product benefits

• Centralized alarm panel

Product features

• Sixteen output relays: 14 for group realarms, one for an audible device

and one for the self-supervision system

• Small and large stand-alone annunciator applications

• Large centralized or distributed annunciator systems with event reporting

• High immunity to electrical and electromagnetic interference

SACO 64D4 is a self-contained microprocessor-based annunciator

unit with 64 alarm channels. It is used in a variety of applications

requiring supervision of alarm and signalling contacts in power

plants, substations and industrial process installations.

The SACO 64D4 is a self-contained microprocessor-based annunciator

unit with 64 alarm channels. It is used in a variety of applications to

supervise alarm and signalling contacts in power plants, substations

and industrial process installations. The alarm unit is also approved

for use in offshore installations and marine applications.

Further, the annunciator unit can be used in any application where

on/off signals are to be supervised.

Product features

• Sixteen output relays: 14 for group realarms, one for an audible device

and one for the self-supervision system

• Small and large stand-alone annunciator applications

• Large centralized or distributed annunciator systems with event reporting

• High immunity to electrical and electromagnetic interference

General Description

Model 264DD, 264HD and 264ND detailed in this data sheet apply for those

transmitters which include on high pressure measuring side, a direct mount

seal which is integral to the transducer by a short capillary connection inside

a protective rigid tube. This construction forms a standalone single assembly

suitable to be mounted to the process by the seal mounting facilities.

By properly selecting the high and low pressure side variant in the ordering

codes model 264DD can be in the following versions :

a) one direct mount seal and one flange for process connection, direct

1/4 – 18 NPT or 1/2 – 14 NPT through adapter; this allows also to connect

the other leg (wet or dry) for differential measurement.

A proper filter is supplied as standard  when 1/4 – 18 NPT connection is

selected, in order to plug the unused entry, leaving it vented for gauge

measurement with reference to atmosphere.

b) one direct mount seal and one remote seal with capillary; the two seals

allow again a differential measurement and must be selected of same

type/size.

Model 264HD and 264ND have the direct mount seal on the positive side,

respectively with the reference at atmospheric or vacuum pressure, for

gauge or absolute measurements.

Allowed types of direct mount seal are mainly used for chemical application:

– flush diaphragm flange mounted seal

-extended diaphragm flange mounted seal-off

-line threaded connection sea

-off-line flanged connection seal

Base accuracy : ±0.075%

Span limits

– 0.54 to 16000kPa; 2.14inH2O to 2320psi

– 1.1 to 16000kPa abs; 8mmHg to 2320psia

Reliable sensing system coupled with very latest

digital technologies

Comprehensive sensor choice

– optimize in-use total performance and stability

5–year stability

Flexible configuration facilities

– provided locally via local keys combined with LCD

indicator or via hand held terminal or PC configuration platform

Multiple protocol availability

– provides integration with HART®, PROFIBUS PA

and FOUNDATION Fieldbus platforms offering

interchangeability and transmitter upgrade capabilities

Broad selection of variants, options, fill fluids

and wetted materials

– allows total flexibility maximizing cost-effective aspect,

also providing applications with critical process media

at extended temperature range

PED compliance to sound engineering practice (SEP)

With the SACO annunciator units you can check the alarms from one collective point.

These units are used in a variety of applications requiring supervision of alarm and

signaling contacts in power plants, substations and industrial process installations.

Scope

• The annunciator units can be used as independent stand-alone units, or they can be

integrated via a fiber-optic bus to form complete supervision, event sequence reporting

and data acquisition systems

Product benefits

• Used in a variety of applications requiring monitoring of analog quantities such as

temperature, current, voltage, power, etc. in power plants, substations and industry

• Also used in off-shore installations

Product features

• Self-supervision

• Doubled auxiliary supply

• First-out alarm indication

• Event register capacity

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.