Easy Field Configurable Input Ranges for J, K, T, R, S, E, and B Type Thermocouples

Eliminates Ground Loops with 1800VDC Input-to-Output Isolation

ASIC Technology

Five Field Configurable Output Ranges: 0-5V, 0- 10V, 0-1mA, 0-20mA and 4-20mA

ASIC Technology for High Reliability

The G428 is a DIN rail mount, thermocouple input signal conditioner with 1800VDC isolation between input, output and power. The field configurable input and output offer flexible, wide ranging capability for J, K, T, R, S, E and B type thermocouples.

The input of the G428 can be configured for over 60 different thermocouple temperature ranges (see Table 6). The output is linear to temperature and can be set for either 0-5V, 0-10V, 0-1mA, 0- 20mA or 4-20mA.

For an RTD and thermocouple input temperature transmitter with improved accuracy and stability, see Action I/Q model Q488. PC or DIP switch programmable

Wide ranging, precision zero and span pots allow 50% adjustablity of offset and span turn-down within each of the ranges. For example, the 0-1000°C range could be offset and turned down to provide a 4- 20mA signal representing 500-1000°C. Similarly, adjustment can be referenced to the output range. The example from above could be used to provide a 12-20mA signal from a 750 to 1000°C temperature input.

Application
The G428 field configurable thermocouple input isolator is useful in eliminating ground loops and interfacing thermocouple sensors to data acquisition and control systems.

Three way isolation completely eliminates ground loops from any source. Isolation protects expensive SCADA systems from ground faults and allows the noise reduction benefits of grounded thermocouples to be realized.

The G428 employs the latest in advanced analog signal processing technology. In addition to its multiple microprocessors, a special ASIC* chip is used for high accuracy and reliability. The G428 is also equipped with cold junction compensation (CJC) circuitry to provide ice-point reference. Upscale or downscale thermocouple burnout detection is switch selectable.

High density DIN rail mounting offers an extremely compact solution to save valuable panel space.