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Sensor Interfacing

The Anville Series 800 is based on the same parallell input technology that is used in the Series 825. Using 19″ rack based construction, In this format it can be used to build much larger systems. Units having mixed input types can be created to suit any application in continuous monitoring or product evaluation and testing. Combined with Prodigy software systems requiring upwards of 24 channels can be realised.

For thermocouple measurements the Anville Series 800 differs from the majority of interfaces by the design of the thermocouple input connection, associated thermocouple cold junction compensation and in the use of analogue input parallel processing enabling the unit to have a acquisition rate of better than once per second for all inputs. The Series 800 uses individual high speed amplification and analogue to digital conversion on each input channel with conversion to engineering units (°C/°F) carried out by the internal microcontroller. In the Anville Series 800 all cold junction compensation errors are minimised by using correctly compensated miniature type T thermocouple connectors with matching thermocouple wiring to the internal cold junction sensor. A 1/3 DIN Pt100 sensor measures the cold junction temperature to an accuracy of ±0.1°C at 0°C. Design of the physical layout of the cold junction reduces any thermal scatter to a typical deviation of ±0.05°C.

Inputs for all of the standard thermocouple types can be provided as can Pt100 inputs, 4-20mA transducer inputs, digital inputs including frequency or counting, solid state or relay contact outputs and analogue outputs for setpoint generation.

Data communications can be either RS485 or Ethernet enabling distributed systems to be contstructed easily.

The Anville Series 800 measurement range for type T thermocouples is -200°C to 300°C with a resolution of 0.01°C. Over a measurement range from -50°C to 300°C the overall system accuracy is ±0.25°C. This accuracy is maintained over an ambient operating temperature range from 0°C to 50°C and includes all errors due to thermocouple cold junction compensation, DC amplification, A/D conversion and thermocouple linearisation.

The Series 800 accuracy of ±0.25°C is a worst case “out of the box” value including all system errors but excluding thermocouple sensor error.

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