Home Thermocouple/RTD/Diode Small Instrumentation Modules SRS SIM923A Platinum RTD Temperature Monitors

SRS SIM923A Platinum RTD Temperature Monitors

Product Code:
15025
Manufacturer: Stanford Research Systems

 

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

 

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The Stanford Research Systems SIM923A RTD Monitor continuously reads a single sensor and provides both digital and analog outputs. Based on the modular SIM platform, they provide high performance capability in a small footprint.

The SRS 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.

The SIM923A employs 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
     Bandwidth 4 kHz
Operating temperature 0 °C to 40 °C, non-condensing
Interface Serial via SIM interface
Connectors
     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)
Dimensions 1.5" × 3.6" × 7.0" (WHL)
Weight 1.4 lbs.
Warranty One year parts and labor on defects in materials and workmanship
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