Central Acquisition Expansion Module

Kingmach designs this expansion module as a straightforward way to increase the channel count of a central data acquisition system. It suits permanent monitoring setups as well as long-term construction-phase instrumentation where budgets can’t jump to a full new logger every time a sensor array grows. The module connects to the main unit through a rugged RS-485 bus, which most of their systems already support, and draws power from the same source. Each module adds a fixed number of channels—commonly 8 or 16 in industrial configurations—and multiple modules can be daisy-chained to reach hundreds of points while keeping wiring manageable. Inside, the signal conditioning covers the typical sensor outputs: millivolt, 4–20 mA, and vibrating wire frequency. Kingmach builds in surge protection on each channel and optical isolation on the communication side, which helps reduce ground-loop noise that often plagues distributed monitoring. Because the unit is fanless and rated for industrial temperature ranges, it works inside dam galleries or beside railway tracks without active cooling. Configuration is handled through the same software package used for the central logger, so the learning curve stays flat for technicians familiar with Kingmach’s interface. For projects that need customization, the company can adjust channel mix, add relay outputs for alarm triggering, or pre-wire terminal blocks to match specific connector types.