What is a Limit Alarm? from AutomationDirect

What is a limit alarm? Limit alarms are hardware devices that accept analog inputs and provide low-limit, high-limit, or other alarm indications based on the input value. Common applications include: Over-temperature alarms for heaters or ovens. Low-level alarms in tanks to prevent pumps from running dry. Overcurrent alarms in electrical systems. And, process monitoring in HVAC, water treatment, manufacturing, and automation. A typical automation system incorporating a PLC as the brains of the system can be set up to read inputs and provide alarms and outputs based on program settings. However, not every application has the need for a PLC, which is where a limit alarm like-these offered at AutomationDirect-may be used. These analog-to-relay limit alarm modules can safeguard your system from abnormal conditions by alerting the proper personnel or taking the proper action when issues arise. The FC-3RLY2 is an analog-to-relay limit alarm module that is field configurable for a variety of alarm and control applications. It can be powered by 24 VAC or 24 VDC and accepts a variety of input signals like these. It offers two Form C SPDT relay outputs. The configuration and Trip/Release Point programming is accomplished with simple DIP Switches, and a single PGM-pushbutton. LEDs provide an indication of operating status and are used during the Trip/Release Point programming. The FC-3RLY4 is an analog-to-relay limit alarm module, much like the previous, but offers four Form A SPST relay outputs. Both models have removable terminal blocks to make wiring a breeze and can be mounted on DIN rail or side mounted. AutomationDirect also offers the ProSense SCU-3100, a universal signal conditioner that accepts a variety of input signals and it incorporates a limit alarm. It has two individually programmable relay outputs. This module is programmed with a separate SCU-PDM2 LED detachable display module. The SCU-3100 is FM approved for use in hazardous location applications and can be mounted to DIN rail. To learn more about these easy-to-use limit alarms and more, visit AutomationDirect.com