The GEOXTR-18 card uses Modbus over an RS485 connection. We recommend using FTDI’s USB to RS485 Cable to make this connection between PC and Card. The included TC18 Viewer Software will display and log thermocouple data, as well as allow for the GEOXTR-18 card to be configured. Other Modbus software will easily connect to the GEOXTR-18 card as well, including many SCADA systems.

In concept, a thermocouple wire is sensed with a miniscule amount of current. This results in a completely negligible voltage drop over even long distances. However, many TC Input card manufacturers design their cards with extra features and follow standard input protection schemes. These extra electronics introduce a small amount of leakage current onto the thermocouple which over long distances of 24 awg thermocouple result in voltage drops in the mV range, enough to drastically alter the temperature readings. As a result, many claim that 100ft is the maximum effective length of a thermocouple. Our GEOXTR-18 card however is designed to have as little leakage current as possible, while still maintaining the same features and protections expected of a TC Input Card. This enables us to maintain data accuracy at long lengths where others can deviate by over 20°C.

No, due to the use of premium components the GEOXTR-18 can work within its operating temperature range with nearly indistinguishable temperature error. This means that from season-to-season, or from day-to-night in extreme climates, temperature readings remain reliable. This is contrasted with many cards which struggle to exceed -10°C, and can experience dramatic temperature reading fluctuations based on shifting ambient temperature.