custom manufactured

alarm annunciators

Customized industrial alarm panels with displays designed to alert operators to critical alarms for an industrial process. We supply both blind (without display) and integrated (with built in display) types, For use with the blind units we offer several different stand alone LED displays .


This modular system comprises of 4 way panel mount alarm modules which wire directly to the field. The system comprises of a control unit which houses the push buttons, inputs and power supply inputs as well as potential free contacts for the horn and trip functions.


LED backlit indicator system for use with PLC’s and alarm annunciators. Removable terminals, User laser printable indicator window insert, Fully solid state with common negative & common positive versions


A micro controller based alarm annunciator system that was designed for use in industrial rail mount alarm system. The master unit which consists of the user push button inputs and supply inputs as well as potential free contacts for the horn and trip functions. The slave units consist of 4way alarm modules with field inputs and display outputs.

Common functions

Manual or auto reset

Although there are many different defined alarm sequences the two most common are the manual reset and the auto-reset sequence.

The manual reset has two main controls an accept or acknowledge button and a reset button. On receiving an alarm the alarm is latched (stored). It is normally announced by an audible sound and a flashing display plus the operation of a TRIP output. The Trip output can be used to halt the process or plant. When the alarm is acknowledged the display changes to a steady indication to show the difference between an acknowledged and an unacknowledged alarm. If an alarm has cleared operation of the reset control will clear all non-present alarms and trip signals.
Where the trip has been used to lockout a plant or process often the reset button is replaced with a key switch so that only a key holder can operate the reset and restart the plant or process. This can be interfaced to a safety lockout system so nobody can restart the plant while maintenance personnel are still working in a dangerous area.

The auto reset works on the acknowledge control and once an alarm is acknowledged as soon as it clears it auto-resets.

Input polarity selection

Selectable normally open or normally closed alarm: Normally Open : Alarm is activated when a positive input is present. Normally Closed : Alarm is activated when the positive input is not present.

First up fast flash

This is where the first alarm in a group will flash fast when other alarms occur in the group. This is to show which alarm started first in a group of alarms and it is often used to reduce the fault finding time where alarms are inter-related. An example could be a conveyor belt that has interrelated tripping of the motor from multiple sources. On a trip event all of these interrelated alarms would be activated and the FU/FF system would show which alarm was the originating fault.


This is mostly used for informing the operator that there has been a change in alarm status. The ring-back signal is a double-blip of 1 second duration operating the horn relay. In both the manual and auto-reset sequences there are segments of the sequences where the operator will not know if the alarm is present or has cleared. The ring-back signal tells the operator that there has been a change. In auto reset mode the alarm would just clear automatically and this is indicated to the operator by the ring-back blip. In manual reset mode the control switches should be used to see what has changed

Imput response time

This allows for a fast nominal response time of 4 m sec or a slower debounce time on noisy input lines. As part of the system for the alarm annunciator to distinguish between transient signals, contact bounce and true alarm signals. different types of signal need different response times. typically pressure operated sensors such as bucholz relays need a very fast response as the desired signal would be ignored as a transient with a slow response setting

Reverse lamp logic

Typically used when a window is required to display a “POWER OK” as the normal condition. The standard annunciator functionality is the opposite of what is expected when monitoring a power supply. Inverting the lamp display Logic solves this problem such that the “Normal State” is indicated by the Display being On. However when the monitored Power Supply fails (in Alarm) The Display will “Flash Slow”. On Acknowledge the Display will go out indicating Failure of the Power Supply by being off. Thus a “POWER OK” alarm window makes sense. While the failure still causes an alarm.


This function operates in the “Manual Reset Mode” only. When enabled and after a RESET any alarm still present and in the ACKNOWLEDGED/ACCEPTED STATE will be returned to the unacknowledged state and treated as a newly arrived alarm. i.e.: flashing LED’s, GA and trip relays active. This is used to remind operators of any outstanding alarms

Status retention

This feature is activated on a loss of power. It stores the last known status of the annunciator at the time of the power loss. If activated, upon the restoration of the power supply the system will power-up displaying the same status that existed at the time of the power failure.

Auto silence

For use in un-attended locations, where it is not necessary to have the horn running continuously until the next operator attends the site. It is therefore possible to set the annunciator to automatically silence the horn. The G.A. relay will deactivate after 10 Min

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5 Ramsay Street
South Africa


+27 (011) 689 5700

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