The MS3705HB is an advanced, slim plug-in digital alarm setter optimized for extreme signal precision and reliable process interlocking within industrial automation loops. Designed for compact control panel arrangements, this space-saving instrument features a 29mm wide housing engineered for flexible wall or DIN rail mounting. The module continually evaluates incoming DC current or voltage signals against dual set-points (upper and lower limits) and executes protective trips via two independent isolated Form C relay contact closure signals. It stands out with a front-panel 3-digit 7-segment LED display and local UP/DOWN switches, enabling operators to calibrate trip points from 0 to 105% of span with high-resolution 0.1% programmatic steps. Complete with an extensive 4-way galvanic isolation barrier rated at a 2000V AC dielectric strength, the MS3705HB flawlessly segregates field inputs, operating power, and the discrete relay channels to eliminate disruptive ground loops and cross-channel electrical noise.
Key Product Features
- High-Accuracy Digital Processing: Integrates an advanced digital operation circuit delivering a trip point setting accuracy better than ±0.1% of span.
- Programmable Multi-Mode Relays: Features 4 selectable relay activation modes (Modes 0, 1, 2, and 3) allowing field customization of energize/de-energize logic based on high or low threshold events.
- Local Parameter Visualization: Equipped with a bright, front-accessible 8.0mm high 3-digit LED display for direct monitoring of trip points, programmable hysteresis values, and onboard CPU diagnostics.
- Industrial-Grade Output Contacts: Provides dual independent Form C relay outputs handling a maximum allowable voltage of 250V AC / 30V DC and a 5A rated load capacity.
- Rugged Environmental Fortification: Protected by a flame-retardant UL 94V-0 rated ABS resin enclosure and equipped with a factory-standard HumiSeal® polyurethane conformal coating for superior humidity and particulate resistance.
