The MS3708 is a high-precision, slim plug-in frequency-to-analog converter designed to capture and convert pulse train signals from flow sensors, tachometers, and proximity switches into standard industrial DC process signals. Engineered for space-restricted control panels, this module features a highly compact 29mm wide profile optimized for secure wall or DIN rail mounting while providing options for an isolated single or dual output. The MS3708 accommodates a diverse array of field sensor inputs—including dry contacts, open collectors, AC voltage pulses, and 4-20mA DC current pulses—across an extensive operating frequency range spanning from 0-15Hz up to 0-100kHz. Built to withstand demanding industrial environments, the device boasts robust 4-way galvanic isolation rated for a 2000V AC dielectric strength between the input, output 1, output 2, and power lines, effectively eliminating disruptive ground loops and protecting sensitive downstream PLC or SCADA hardware.
Key Product Features
- Versatile Sensor Input Compatibility: Supports multiple pulse train types, including dry contacts, open collectors, DC voltage pulses, 4-20mA DC pulses, and highly sensitive AC voltage pulses down to a 50mVp-p minimum threshold.
- Onboard Sensor Power Supply Options: Can be factory-configured with an integrated sensor power supply delivering 5V DC, 12V DC, or 24V DC for both 2-wire and 3-wire field transmitters.
- High-Fidelity Signal Conversion: Delivers an accuracy rating better than ±0.3% of span combined with an exceptionally low output ripple of 0.2%p-p or less for highly stable analog data logging.
- Advanced Dual-Output Loading: Supports standard dual 4-20mA current channels with an allowable output load up to 550Ω max. on Output 1 and 350Ω max. on Output 2 (upgradeable to 750Ω/550Ω via Option /L).
- Rugged Component Substrates: Formulated within a flame-retardant UL 94V-0 rated ABS resin housing with nickel-plated steel M3.5 terminals and a premium HumiSeal® polyurethane conformal coating for high resistance against humidity and ambient contaminants.
