Measuring Converter

Redundancy Evaluator

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For important analogue values it must be considered that a measuring value can also be incorrect if it is inside the admissible measuring range. Such an error can be determined through redundancy measuring, here three analogue values are measured and a mean value is obtained. If the difference between the channels exceed a user-defined limit, the deviating input is reported via a potential-free relay and is at the same time excluded from the averaging. Consequently a secure analogue signal continues to be present at the output. If more than one channel deviates, the output is set to the measuring range start and all relays report an error. The redundancy evaluator AD-RA 300 can also be operated with only 2 inputs. In this case, the percental difference of the two measuring signals is monitored. If the difference is too great, the two relays would in this case also report an error and the output signal is set to the measuring range start. All necessary parameters can be configured directly at the device or via a PC software.


  Specific characteristics

  • 3 current inputs (bipolar)
  • the deviating input is reported via a respective potential-free relay
  • current and voltage input are freely scalable and simultaneously operational
  • multicoloured (RGB) illuminated LCD display
  • simulation mode (auto/manual)
  •   Business data

    catalog number AD-RA 300 GVF



      Technical specifications

    Current inputs
    Measuring range -20 ... + 20 mA
    Number 3
    Input resistance 60 Ohm
    Output current
    Max. output range 0 ... 20,4 mA
    Max. burden 500 Ohm
    Residual ripple 20 ľAss
    Output voltage
    Max. output range 0 ... 10,2 V
    Min. burden 5 kOhm
    Residual ripple 10 mVss
    Input 13 bit
    Output 10 bit
    Relay outputs A...C
    Contact type 3 changeover contact
    Max. AC-breaking capacity 250 V AC, 2 A AC, 50Hz
    Max. DC-breaking capacity 50 V DC, 2 A DC
    Switching operations
    Mechanical 107
    AC: 230V / 2A, cos(phi)=1 6 * 105
    AC: 230V / 2A, cos(phi)=0,4 2 * 105
    DC: 24V / 1A 2 * 105
    Graphic-LCD 42x64 Pixel, background RGB lights
    Digital display 4-digit, can be configured
    Display function scaled input signal, input signal, output, limits, scaling unit
    Transmission behaviour
    Basic accuracy 0,2 % of full scale
    Temperature influence +/- 100 ppm/K of full scale
    Rise time 100 ms (output auf 90 %)
    Voltage range AC 50 ... 253 V AC, 50/60 Hz
    Nominal voltage AC 230 V AC
    Voltage range DC 20 ... 253 V DC
    Nominal voltage DC 24 V DC
    Power consumption AC / DC 2,2 VA / 1W
    Manner of fastening DIN rail 35mm (EN 50022)
    Type of protection IP 20
    Connector cross section max. 2,5 mm˛
    Weight ~ 200 g
    Environmental conditions
    Ambient temperature -10 ... 60 °C
    Storage and transport -10 ... 70 °C (no bedewing)
    Product family standard 1) EN 61326
    Emitted interference EN 55011, CISPR11 Cl. B
    1)During electromagnetic disturbance minor changes in output signal are possible.
    Electrical safety requirements
    Product family standard EN 61010-1
    Overvoltage category II
    Pollution degree 2
    Galvanic isolation, test voltages
    Input/output 2,5 kV (1 min)
    Signal/auxiliary voltage 4 kV (1 min)
    Protective systems
    Input/output over voltage and over current
    Power supply over voltage, over current and over temperature

      Block and wiring diagram