Modus Instruments, Inc. DA-1-04E-0-RRRF display/alarm

The Modus Instruments Inc. DA‑1‑04E‑0‑RRRF is a compact low‑pressure transducer/display/​alarm controller that measures differential pressures in the 0–0.5 in H₂O range and provides up to two alarm outputs. Common failure points for this class of units include burned or cracked power supply ICs, degraded display LEDs, failed relay contacts on the alarm circuits, and corrosion or disconnection at the 3/16″ barb fittings. First‑check diagnostics should verify that the unit receives clean 120 Vac (or appropriate DC) with a multimeter, inspect the display for backlight failure or burnt segments, test the alarm relays for continuity, and confirm proper wiring to the pressure transducer and external load.[oss-gpt-20b] Post Comment

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