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Model 10A61-2
 Dual 4-20 mA Input Conditioner

Input Type Description SPS6000 SPS8000 System 10
Voltage, Current Dual 4-20 mA Input X*X
 X-X
 X*X


This card can condition two independent current signals within the ISA standard range of 4-20 mA. Both unipolar and bipolar ("zero-center") inputs are allowed. Since the 10A61-2 does not provide excitation, the current source must furnish its own power supply, if required.

Chopper-stabilized amplification with active low-pass filtering yields excellent voltage compliance and makes this conditioner suitable for virtually any standard Process Industry current input.

In System 10, "absolute" calibration may be used for a 10A61-2 channel if the parameter being measured is milliamperage itself. "Two-point" ("dead-weight") calibration should be used if the mA input signal is an analog of some other parameter that has at least two independently and accurately known calibration values. In the SPS6000 System, both "calculated" and "two-point" calibration are available.

Specifications:
  • Input Current: 4 to 20 mA (unipolar) or 4 to 12 to 20 mA (bipolar or "zero-center"); automatically selected- on an individual channel basis- when the channel is configured
  • Amplifier (per channel):
      Common-Mode Range: ±50 V operating; ±90 V without instrument damage
      Common-Mode Rejection Ratio: DC: -60 dB; at 60 Hz: -75 dB
      Input Impedance: Differential: 100 ohm; Common-Mode: 125 k-ohm
      Burden: 2 V-DC at full scale
      Offset: Initial: ±0.05% of full scale; vs. Temperature: ±50 ppm/°C; vs. Time: ±20 ppm/month
      Gain Accuracy: ±0.02% of full scale typical, following calibration*
      Gain Stability: vs. Temperature: ±50 ppm/°C; vs. Time: ±50 ppm/month
  • Filter (per channel): 3-pole modified Butterworth; 3 dB down at 10 Hz; 60 dB down at 100 Hz
      Step-Response Settling Time (Full-Scale Output):
      To 1% of final value: 150 msec
      To 0.1% of final value: 200 msec
      To 0.02% of final value: 250 msec
  • Auxiliary Outputs: Filtered outputs available on wire-wrap pins
    *Initial (uncalibrated) inaccuracy may be as great as ±0.05% of full scale (see "Accuracy Specifications"). Maximum error that could occur upon replacement of a Model 10A61-2 not followed by calibration is ±0.1% of full scale.


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