Input
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Resistance measurement with constant current supply for 2- or 4-wire connections
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Digital converter resolution
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16-bit
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Filter time
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Configurable between 2 and 20 ms
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Conversion time
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Same sensor types
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75 ms per channel with 50 Hz filter
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Conversion procedure
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Sigma-delta
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Output format
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INT or UINT for resistance measurement
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Sensor
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Pt100
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-200 to 270°C (at 0.01 K resolution) -200 to 645°C (at 0.02 K resolution) -200 to 850°C (at 0.04 K resolution)
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Pt100 temperature measurement range
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Configurable per channel
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Resistance measurement range
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0.010 to 420 Ω / 0.005 to 210 Ω
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Sensor standard
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EN 60751
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Common-mode range
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±1 VDC
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Insulation voltage between channel and bus
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500 Veff
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Linearization method
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Software
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Measurement current
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1.014 mA ±1.25%
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Reference
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422 Ω ±0.05%
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Permissible input signal
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Short-term max. ±30 V
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Max. error at 25°C
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Gain
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0.008%
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Offset
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0.012%
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Max. gain drift
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0.0008%/°C
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Max. offset drift
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0.0006%/°C
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Nonlinearity
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<0.002%
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Crosstalk between channels
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-70 dB
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Temperature sensor resolution
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Pt100
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1 LSB = 0.01 K (up to 270°C) 1 LSB = 0.02 K (up to 645°C) 1 LSB = 0.04 K (up to 850°C)
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Resistance measurement resolution
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Measurement range up to 420 Ω
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1 LSB = 10 mΩ
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Measurement range up to 210 Ω
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1 LSB = 5 mΩ
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Input filter
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Cutoff frequency
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115 Hz / First-order filter
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Slope
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-20 dB
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Common-mode rejection
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50 Hz
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>70 dB
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DC
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>70 dB
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Temperature measurement monitoring
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Range undershoot
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0x8001
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Range overshoot
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0x7FFF
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Open circuit
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0x7FFF
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General fault
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0x8000
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Open inputs
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0x7FFF
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Resistance measurement monitoring
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Range undershoot
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0x0000
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Range overshoot
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0xFFFF
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Open circuit
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0xFFFF
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General fault
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0xFFFF
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Open inputs
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0xFFFF
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