Questions about the alarm
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Does the alarm detect something and then give an alert? So it can both measure and give an alarm? Is it still just equivalent to a source of sound and light? The system checks whether the information transmitted by the transmitter to the system meets the alarm conditions, and then sends a signal to the alarm so that it activates?
After detection by the alarm installed on-site, a 4-20ma signal is sent back to the DCS, and the detector outputs an alarm signal to the local alarm. The 4-20ma signal received by the DCS generates a DO output for alarm purposes, depending on the value of the alarm threshold, in order to activate the area alarm located on-site; this area alarm is installed separately.
Different alarms have different ways of generating alerts; for example, a pressure switch directly outputs a contact signal to the DCS or alarm device to trigger an alert； The pressure transmitter outputs a 4–20mA current signal to the DCS or alarm device, where it is compared to trigger an alarm.
For example, suppose I have a level alarm set to trigger at 13M. If there are no level measurement instruments available, only this one level alarm, then will this alarm go off in that case?
What you mean is that the switch-type version works by having a wire inside the alarm; as long as that wire is touched, the alarm goes off immediately； For analog signals, the analog signal needs to be sent to the system, which will then analyze it. If the analysis of this data leads to the conclusion that an alarm is necessary, the system will send a signal to the alarm device so that it can respond
There are many types of alarms available on the market today. Some of them come with a display, allowing them to measure certain values and trigger alarms; others lack a display and serve solely as alarms.