FM-approved SPA2 programmable current/voltage and RTD/thermocouple limit alarm trips can be used on equipment and processes in hazardous locations. The alarm trips provide on/off control, warn of trouble and provide for emergency shutdown by sending as many as four relay outputs when a monitored process signal or sensor reading falls outside a user-selectable high or low limit. They trips accept input signals from transmitters, temperature sensors, resistance and potentiometer devices and direct millivolt sources and provide two or four independent and individually configurable alarm relay outputs. Each alarm trip relay can be programmed as a high or low limit alarm, rate-of-change alarm, input fault alarm or self-diagnostic alarm.
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