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Vibrating Wire Strain Gauges for Bridge, Tunnel & Dam Monitoring: Complete Selection Guide
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Temperature Acquisition Module for Field Monitoring
Temperature Acquisition Module
Collecting temperature data from dozens of thermistor strings in a dam or tunnel isn't a job for a generic PLC. The wiring alone demands high-density, cold-junction-compensated inputs, and the logging schedule needs to match thermal response times—not factory-floor scan rates. Kingmach builds temperature acquisition modules specifically for these distributed, long-term monitoring jobs. They handle the low-level signals from thermocouples and RTDs without extra signal conditioning, auto-detect common sensor types, and store data onboard if the network drops. We configure each unit to your sensor layout and communication protocol, so it drops into an existing monitoring network without a complete rework of the data backbone.
Technical Detail
Configured around process stability, mold life, and long-term uptime.
These modules are designed to sit close to the sensors—often in a weatherproof enclosure on-site—and talk back to a central logger or SCADA via RS-485 or TCP/IP. A typical unit offers 16 to 32 universal analog inputs, with 24-bit ADC resolution to catch temperature drifts of 0.1 °C or less. Cold junction compensation is handled channel by channel, which matters when you're measuring with ungrounded thermocouples in a damp environment. Power management is built around low sleep currents (<1 mA) for solar-powered stations; a timed wake-up triggers a scan of all channels, stores the timestamped values in non-volatile memory, and goes back to sleep. Users often ask about calibration effort. Each input path has a stored calibration table, so swapping a sensor only requires a pointer change in the config file—no manual potentiometer tweaks. Kingmach also provides a Windows-based utility that scans the module, identifies connected sensor types, and suggests range and filter settings. Custom firmware options include onboard alarming (e.g., email alerts when a threshold is crossed for a configurable duration) and Modbus register maps tailored to integrate with dataloggers from Campbell Scientific, Geokon, or others. Because every project has a different jacketing and connector preference, we offer terminal block, M12, and military-style circular connectors, as well as mounting plates for DIN rail or enclosure backplane.
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Products
Production modules
Wireless Data Logger (low power consumption design) JMWX-5RTU
Wireless Data Logger (low power consumption design) JMWX-5RTU
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FAQ
Common technical questions
How does the module handle mixed thermocouple and RTD inputs on the same unit?
Each channel can be individually configured through software. The module auto-detects the connected type based on a quick resistance and voltage check during startup, then applies the correct linearization and cold junction compensation. You can mix J, K, T, and E-type thermocouples with PT100 or PT1000 RTDs across channels without any hardware jumpers.
What's the typical power consumption in a solar-powered monitoring station?
In sleep mode the module draws under 1 mA at 12 V DC. A full-channel scan with RS-485 transmission takes about 200 ms and peaks at 50 mA. For a station logging once per hour, a 20 W solar panel with a 12 Ah battery is usually sufficient, though exact sizing depends on sensor warm-up requirements and radio transmission.
Can the module store data locally if communication fails?
Yes, onboard flash can hold up to 256,000 timestamped records, configured as a circular buffer. When the connection is restored, the logger can pull the missed data blocks via standard Modbus file transfer commands without any manual intervention.
How do I connect this to a Geokon or Campbell Scientific datalogger?
The module supports Modbus RTU over RS-485 and Modbus TCP. We provide a tested register map that matches the sensor arrays these loggers typically scan. For Campbell dataloggers, a CRBasic include file is available that handles the polling and units conversion, so you can integrate it as a normal sensor node.
What protection does the module have against lightning or wet environments?
All signal inputs include TVS diodes and series protection resistors. The enclosure options are IP66 rated with cable glands. For areas with frequent electrical storms, we recommend adding an external surge protector on the power and communication lines, which we can supply pre-wired.
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