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MAQ20 Analog Input Modules RTD and Potentiometer

Interface to 3-Wire and 4-Wire Sensors

Two MAQ20 resistance input modules are offered. One interfaces to 3-wire sensors and has 6 input channels; the other interfaces to 4-wire sensors and has 5 input channels. The 3-wire module interfaces to 3 types of sensors: 100Ω Pt and 120Ω Ni RTDs, and potentiometers; the 4-wire module interfaces to 100Ω Pt and 120Ω Ni RTDs. Precision, low magnitude current sources are used to minimize sensor self-heating and cancel lead resistance errors when using 3-wire sensors. All channels are individually configurable for sensor, range, alarms, and averaging to match the most demanding applications. High, Low, High-High and Low-Low alarms provide essential monitoring and warning functions to ensure optimum process flow and fail-safe applications. Hardware low-pass filtering in each channel provides rejection of 50 Hz and 60 Hz line frequencies. Field I/O connections are made through a pluggable terminal block with positions designated for the termination of wiring shields.

Input-to-bus isolation is a robust 1500 Vrms and each individual channel is protected up to 240 Vrms continuous overload in case of inadvertent wiring errors. Overloaded channels do not adversely affect other channels in the module, which preserves data integrity.

Channels in a module can be selectively enabled for scanning. All channels are enabled by default; however, non-used channels can be disabled to increase the sampling rate of enabled channels.

Input sensors and input ranges are selectable on a per-channel basis. One to three ranges are available depending on the input sensor. Over-range and under-range up to 2% beyond the specified input values is allowed. Sensor linearization is performed in the module, and accuracy is guaranteed to ±f.s.

Circuit diagram Dataforth MAQ20 Analog Input Modules RTD and Potentiometer

Block Diagram MAQ20 Analog Input Modules RTD and Potentiometer

PDF Downloads:

  • Data Sheet MAQ20 Analog Input Modules: RTD and Thermocouple
  • Full catalogue MAQ20
  • Product Overview MAQ20
  • Brochure MAQ20
  • Accessories MAQ20

  • 2 Modules for Type MAQ20 Analog Input Modules RTD and Potentiometer:

    MAQ20-RTD31 6-channel, 3-wire Pt100, Ni120, Potentiometer Input
    100Ω Pt a = 0.00385; –100°C to +850°C (Default)
    100Ω Pt100 a = 0.00385; –200°C to +200°C
    Pt100 a = 0.00385; –100°C to +100°C
    Ni120 a = 0.00672; –80°C to +300°C
    Potentiometer 0Ω to 5kΩ
    Analog Input Module, RTD / Potentiometer, 3-Wire, Type Pt and Ni, 6-channel
    MAQ20-RTD41 5-channel, 4-wire Pt100, Ni120
    100Ω Pt a = 0.00385; –100°C to +850°C (Default)
    100Ω Pt100 a = 0.00385; –200°C to +200°C
    Pt100 a = 0.00385; –100°C to +100°C
    Ni120 a = 0.00672; –80°C to +300°C
    Analog Input Module, RTD, 4-Wire, Type Pt and Ni, 5-channel


  • 6 Input Channels for 3-Wire Sensors
  • 5 Input Channels for 4-Wire Sensors
  • Interface to Pt100, Ni120 RTDs and Potentiometers
  • All Channels Individually Configurable for Sensor, Range, Alarms, Averaging
  • 1500 Vrms Input-to-Bus Isolation
  • Each Channel Protected up to 240 Vrms Continuous Overload1500 Vrms Input-to-Bus Isolation
  • Selective Enabling of Module Channels for Scanning
  • Operating Temperature -40 °C to +85 °C
  • Dimensions 114.6 x 15.3 x 82.2 mm
  • UL Class I, Division 2, Groups A, B, C, D Pending