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    Temperature Monitors SIM922A & SIM923A — Diode and Pt RTD temperature monitors








  • Single-channel LED display
  • 1.4 K to 475 K with Si, GaAs or GaAlAs diodes
  • 1.4 K to 873 K with RTDs
  • Two analog outputs:
    • Linearized V proportional to T
    • Sensor voltage (buffered)
  • Remote interface

    click to enlarge
    SIM922A & SIM923A
    Rear Panels


    The SIM922A Diode Monitor and the SIM923A RTD Monitor continuously read a single sensor and provide both digital and analog outputs. Based on the modular SIM platform, they provide high performance capability in a small footprint.


    The SIM922A has a programmable, precision 10 µA current source to provide sensor excitation. Results can be displayed in either kelvins or volts.


    The SIM923A has selectable 10 µA and 1 mA current sources to provide sensor excitation. Sensor resistance is determined ratiometrically with a half-bridge circuit consisting of the sensor and an internal reference resistor. The current to the sensor can be reversed by the user to test for any offset. Measurement results can be displayed in either kelvins or ohms.

    SIM900 Mainframe

    Common Features

    Both the SIM922A and SIM923A employ four-wire measurement circuits (±I excitation leads, ±V sense leads), making readings insensitive to series lead resistance. Sensor excitations can be disabled to reduce power dissipation at sensitive cryogenic stages. Measurements are performed at five readings per second.

    The scaled analog output (±10 V) produces a voltage proportional to measured temperature, with a full-scale range from 10 K to 1000 K. A relative-mode button subtracts the last absolute reading prior to scaling, to provide expanded resolution for temperature deviations. The second (monitor) output is the buffered, low-noise raw sensor voltage without any additional processing.

    Either analog output may be coupled to the SIM960 Analog PID Controller for high-performance, closed-loop temperature control.

    A factory-standard calibration curve is pre-programmed for each model. Non-volatile memory also permits storage of a 256-point custom calibration curve to convert sensor units (V or Ω) to temperature units (K).

    Results are displayed on an easy-to-read, 4-digit LED display. Full remote operation is available over the serial interface.



      SIM922A SIM923A

    Number of inputs

    1 1

    Sensor type

    Si, GaAs, or GaAlAs diodes Platinum and other RTDs

    Measurement type

    4-wire 4-wire

    Excitation (constant current)

    10 µA ± 0.01 %, ±5 ppm/°C 1.0 mA ± 0.1 %, ±5 ppm/°C
    10 µA ± 0.1 %, ±5 ppm/°C

    Sensor units

    Volts Ohms

    Input range

    0 V to 7.5 V 0 Ω to 1400 Ω (1 mA excitation)
    0 Ω to 140 kΩ (10 µA excitation)
    (includes excitation lead resistance)

    Calibration curves

    1 standard plus 1 user curve, 256 points DIN 43760 plus 1 user curve, 256 points

    Temperature range
    (sensor dependent)

    1.4 K to 475 K (typical) 1.4 K to 873 K (typical)

    Display resolution

    4 digits 4 digits

    Interface resolution

    1 µV 1 mΩ / 100 mΩ (1 mA / 10 µA)

    Measurement resolution (rms)

    4 µV 1.2 mΩ / 120 mΩ (1 mA / 10 µA)

    Accuracy, (23 ± 1) °C

    20 µV + 0.01 % 5 mΩ / 0.5 Ω + 0.01 % (1 mA / 10 µA)

    Temperature coefficient

    ±5 ppm/°C ±5 ppm/°C
      Common Specifications
    Measurement rate 5 readings per second
    Scaled analog output ±10 VDC full-scale range
         Full scale 10 K, 100 K or 1000 K
         Resolution 300 µV
         Accuracy 1 mV
    Monitor analog output  
         Offset <20 µV (typical)
         Bandwidth 4 kHz

    Operating temperature

    0 °C to 40 °C, non-condensing


    Serial via SIM interface


         Sensor Two DB9 (female)
         SIM DB15 (male) SIM interface
         Analog outputs Two BNC (front panel)

    Power (max.)

    Power supplied by the SIM900 Mainframe, or optionally by a user-supplied DC power supply (±15 V and +5 V)


    1.5" × 3.6" × 7.0" (WHL)


    1.4 lbs.


    One year parts and labor on defects in materials and workmanship








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