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

Order number
Customs tariff number / country of origin 8543 70 90 / Deutschland


Data sheet pdf en-ra300gvf.pdf (251 kB)
Safety instructions pdf ad-safety-instructions.pdf (43 kB)

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 µAss
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 mm²
Weight ~ 200 g
Environmental conditions
Ambient temperature -10 ... 60 °C
Storage and transport -10 ... 70 °C (no condensation)
Product family standard 1) EN 61326-1
Emitted interference EN 55011, CISPR11 Cl. B, Gr. 1
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 3 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




CAD / CAE Daten

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