API-1090-DIN from Absolute Process Instruments is a DIN-rail mounted dual DC input alarm module that actively monitors a process signal and trips two independent relay outputs when setpoints are crossed. It accepts either current (set A to I) or voltage (set A to V) inputs, with range selection controlled by switches B and C and alarm configuration by switch D, enabling flexible use across 0–50 mV to ±10 VDC or 0–1 mA to 4–20 mA signals. Each alarm provides a Form C (SPDT) relay output with common, normally closed, and normally open contacts, rated for up to 8 A, suitable for standard control circuits. A bi-color LED indicates status: green for normal, red for alarm, with optional latching behavior available when the alarm is configured accordingly. Power is applied to terminals 12 (+) and 10 (–), and terminal 11 serves as earth ground if required; the unit mounts to a standard DIN rail, with API TK36 DIN rail recommended. In normal operation the relays are energized for a non‑alarm condition and de-energize when an alarm is active, and the device supports both HI and LO alarm configurations with dual setpoints. The API-1090-DIN is designed for compact, field-configurable process monitoring in control panels, enabling quick visual indication and reliable local alarm signaling for DC process signals in industrial automation environments.
