Visual alarms

After setting up the test system, the inspeetor can fully concentrate on scanning the test zones. In the case of coupling failure, an acoustic alarm horn will sound and a visual alarm message will appear on the PC display. 

To warn of an unfavourable operating condition by the use of an audio-visual alarm or trip or both, schemes can be introduced in the control circuit by means of a temperature detector or other devices to monitor any or all of the following internal conditions of a motor ... 

Motors are also recommended to have one bearing temperature detector in each bearing. This can be fitted within the threaded walls of the bearing that reach up to the bottom of the bearing shell, i.e. close to where the heat is produced. Each detector may have two sets of contacts, each having 2-NO contacts, rated for 5 A at 240 V a.c. and 0.5 A at 220 V d.c. One set can be set at a lower value to provide an audio-visual alarm and the other at a higher value to trip the motor. 

Water-Cooled motors, type CACW (cooling type ICW 37 A 81 or ICW 37A 91) (Section 1.16, Table 1.12) should be fitted with moisture detectors to provide an audio-visual alarm in the event of a leakage in the water circuit or a higher coolant temperature. 

These may be used to detect the hunting of the machine and to provide an audio-visual alarm for unusual running or for vibrations. 

Visual alarms may be required in loeations with a high level of baekground noise. Different alarms may be provided to warn of different emergeneies, e.g. a minor fire, a toxie release or an ineident requiring eomplete evaeuation. 

Audible and visual alarms should be piwided so that operators will know what type of emergency is occurring... 

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. 

Laboratory hoods will be equipped with audible and visual alarms which will be designed to initiate when the average inward face velocity falls below 90 linear feet per minute. 

An exterior intrusion sensor is a detection device that is used in an outdoor environment to detect intrusions into a protected area. These devices are designed to detect an intruder and then communicate an alarm signal to an alarm system. The alarm system can respond to the intrusion in many different ways, such as by triggering an audible or visual alarm signal, or by sending an electronic signal to a central monitoring location that notifies security personnel of the intrusion. 

Although the temperatures that are monitored vary slightly depending on the details of facility design, temperature detectors are used to provide three basic functions indication, alarm, and control. The temperatures monitored may normally be displayed in a central location, such as a control room, and may have audible and visual alarms associated with them when specified preset limits are exceeded. These temperatures may have control functions associated with them so that equipment is started or stopped to support a given temperature condition or so that a protective action occurs. 

Pounds including batteries Low maintenance Minimal training Audible and visual alarm. 

Audible or visual alarms Message on the system console Printed lists or logs Pager message to system operators E-mail to system operator E-mail to external services Periodic review... 

Instrumentation and control. Operation of a fluid cracking unit is simplified by the use of automatic controls. As a further aid, graphic panel-boards are sometimes employed which utilize small indicating instruments located at the appropriate positions in a simplified flow diagram of the process (68,309). Audible and visual alarms, as well as automatic controls for emergency shutdown of the unit, are often provided (202). 

Figure 132 gives a scheme of the functioning of the apparatus worked out by North American Rockwell Corp. (Los Angeles) A conveyer belt transports the luggage first past a neutron generator and then past a detector. The radiation detected is amplified, analysed and compared with a preset threshold. If the detected radiation surpasses the threshold, a visual alarm is activated. ... 

ICAM-APD - Improved Chemical Monitor - Advanced Point Detector. The ICAM-APD weighs 12 pounds and has both audible and visual alarms. 

The ICAD is a miniature lightweight chemical warfare agent detector that can be worn by the individual. It detects and alarms to nerve, blood, choking, and blister agents and is intended for a variety of applications. The ICAD may be used as a point detector. It may be connected with a radio for remote operations and can be mounted on vehicles. It has an audio and/or visual alarm capability. The ICAD weighs 8 oz, does not require maintenance, requires only minimal training, and does not contain a radioactive source. The Marines are presently fielding the ICAD. 

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