Temperature Acquisition Expansion Module

Typical expansion modules from Kingmach pack 8 or 16 additional channels, though custom counts are possible if the project calls for it. Each channel auto-detects common sensor types—3-wire PT100, NTC thermistors, type K thermocouples—so you aren’t locked into one sensor from day one. A cold-junction compensation circuit is built in for thermocouple inputs, which sidesteps the drift you’d otherwise see with external compensation. Engineers often mention the 24-bit ADC per channel, which pushes measurement resolution fine enough to catch sub-0.1°C shifts in concrete curing or permafrost monitoring. The modules talk Modbus RTU over RS-485 by default, though other protocols can be accommodated. That means they drop into existing SCADA or logger networks without extra gateways. Physical installation is straightforward: DIN-rail mounting, removable terminal blocks, and a single daisy-chain cable for both power and data. Kingmach rates the units for -20°C to 70°C operation and 95% non-condensing humidity, which covers everything from cold-region dams to tropical tunnels. When sensor count outgrows the logger, adding a module takes minutes—power down, clip on, address it, and resume logging. No new enclosure, no long cable runs back to the logger. Support engineers can pre-configure modules before shipping, so they arrive ready to map channels into your existing database structure.