Alarm annunciator panels

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Annunciator panels should be in a central location with alarm annunciators and shutdown annunciators grouped separately. The first alarm and the first shut-down normally sound a horn and are annunciated. This is called first-out indication. Subsequent shutdown or alarm signals received by the panel are either not annunciated or are annunciated in a different manner so that the operator can determine the initiating cause of the process upset. 

Alarms are used to alert operators of serious, and potentially hazardous, deviations in process conditions. Key instruments are fitted with switches and relays to operate audible and visual alarms on the control panels and annunciator panels. Where delay, or lack of response, by the operator is likely to lead to the rapid development of a hazardous situation, the instrument would be fitted with a trip system to take action automatically to avert the hazard such as shutting down pumps, closing valves, operating emergency systems. 

A main control and annunciator panel should be installed when the fire alarm system requires more than a single alarm zone. The panel should be installed in the control room or other continuously staffed location. Separate detection zones should be provided for each distinct fire area and identified by a permanent label. A detailed map of the area should also be provided at the annunciator that identifies which zone relates to which annunciator lamp. Systems with more than ten separate zones should be provided with an electric or electroniczone "mimic" panel showingthe location of all alarms on the graphic display of the platform. Basic arrangements of equipment and system design should be in accordance with NFPA 72. A locked main fire panel and control cabinet should be provided. 

Human interface The human interface should be suitable. Alarms may be presented either on annunciation panel, individual indicators, visual display unit screen, or programmable display device. 

Alarms should be displayed on a conventional dedicated annunciator panel or if control room based on a dedicated... 

The cabinet also has an annunciator panel providing audible and visual warning of abnormal conditions. The annunciator is driven by alarm noodules or by external switches or iday contacts. ... 

Some oi all of the fallowing alarms and annunciations may be provided on the AMF panel, depending upon the size of the DG set and the type of load it has to feed to forewarn the operator, and prevent a trip ... 

Figure 16.11 illustrates a general arrangement of such an AMF panel and the above alarm and annunciation provision.s. 

An alarm system consists of sensors that detect different types of events an arming station that is used to turn the system on and off a control panel that receives information, processes it, and transmits the alarm and an annunciator that generates a visual and/or audible response to the alarm. When a sensor is tripped it sends a signal to a control panel, which triggers a visual or audible alarm and/or notifies a central monitoring station. A more complete description of each of the components of an alarm system is provided below. 

Once a sensor in an alarm system detects an event, it must communicate an alarm signal. The two basic types of alarm communication systems are hardwired and wireless. Hardwired systems rely on wire that is run from the control panel to each of the detection devices and annunciators. Wireless systems transmit signals from a transmitter to a receiver through the air—primarily using radio or other waves. Hardwired... 

In addition to the abbreviated LCD display on the fire alarm panel, an annunciator should be provided to graphically display facility conditions in all areas. Often this annunciator is an additional panel provided with the fire alarm system, which contains a graphic display or representation of the plant or area being monitored as well as illumination capabilities which identify the status of all monitored plant areas. 

More and more commonly, fire alarm panel data is transferred to a safety instrumented system (SIS) for graphic annunciation though the SIS human-machine interface (HMI). 

MIMS recorder "A" and the associated RC-415 annunciator continues to monitor the Disassembly Basin temperatures (Technical Specification 3.9.4.1) (Ref 2<28). MTMS recorder B and the bulk moderator Strip Chart Recorder have been turned off The utdown alarm panel bulk moderator alarm has been de-ener ed. 

The three required channels (plus an additional channel installed in the console area) are connected to the AREA RADIATION HIGH (EVAC ALARM AFTER TIME DELAY) annunciator and to the external evacuation alarm system. The external evacuation alarm is actuated if a high alarm (red front panel light on) condition exists for more than 20 seconds unless the LOCAL/REMOTE switch is placed in the LOCAL position. This switch is left in REMOTE position except for testing of alarms or situations in which the reason for the high radiation level is known and which present no hazard to persons outside the Reactor Laboratory. 

What two reactor panel annunciators can cause alarms at Protection and Security Headquarters ... 

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