SIM922/923Diode & Pt RTD Temperature Monitors

Product catalog summary

Overview
The SIM922 Diode Temperature Monitor and the SIM923 Platinum RTD Monitor are designed to measure four sensors simultaneously, offering high-performance and multiple-channel capability in a compact form factor.

SIM922 Features
- Each of the four channels has an independent, precision 10 µA current source for sensor excitation.
- Measurement results can be displayed in kelvin or volts.

SIM923 Features
- Each channel has an independent, stable 1 mA current source for sensor excitation.
- Sensor resistance is determined using a half-bridge circuit with an internal reference resistor.
- The current to the sensor can be reversed to test for offset.
- Results are displayed in kelvin or ohms.

Common Features
- Both models use four-wire measurement circuits, making measurements insensitive to series lead resistance.
- Independent control of channel excitations, which do not switch off when readout advances between channels.
- Sensor excitations can be disabled to reduce power dissipation at sensitive cryogenic stages.
- Measurements can be performed at rates up to four readings per second.
- Built-in factory-standard calibration curve and non-volatile memory for custom calibration curves.

Specifications
- Number of Inputs: 4 for both models.
- Sensor Type: Silicon diode for SIM922; Platinum and other RTDs for SIM923.
- Measurement Type: 4-wire for both models.
- Excitation: 10 µA for SIM922; 1.0 mA for SIM923.
- Sensor Units: Volts for SIM922; Ohms for SIM923.
- Input Range: 0 to 2.5 V for SIM922; 0 Ω to 1400 Ω for SIM923.
- Calibration Curves: 1 standard, 4 user-defined curves for both models.
- Temperature Range: 1.4 K to 475 K for SIM922; 20 K to 873 K for SIM923.
- Display Resolution: 4 digits for both models.
- Interface Resolution: 1 µV for SIM922; 1 mΩ for SIM923.
- Measurement Resolution: 1.2 µVrms for SIM922; 1.2 mΩ rms for SIM923.
- Accuracy: 20 µV + 0.01% of reading for SIM922; 5 mΩ + 0.01% of reading for SIM923.
- Temperature Coefficient: ±5 ppm/°C for both models.

Common Specifications
- Operating Temperature: 0 °C to 40 °C, non-condensing.
- Interface: Serial via SIM interface.
- Connectors: Two DB9 (female) for 4-wire measurement + ground; DB15 (male) for SIM interface.
- Power: Powered by SIM900 Mainframe or user-provided DC power supply.
- Dimensions: 1.5" × 3.6" × 7.0" (WHD).
- Weight: 1.4 lbs.
- Warranty: One year parts and labor on defects in materials and workmanship.

Pricing
- SIM922 Diode temperature monitor: $895
- SIM923 Pt RTD temperature monitor: $895

Catalog excerpts

SIM922/923Diode & Pt RTD Temperature Monitors-1

Small Instrumentation Modules SIM922 and SIM923 — Diode and platinum RTD temperature monitors · Four channels · 1.4 K to 475 K with silicon diodes · 20 K to 873 K with platinum RTDs · Memory for 4 calibration curves plus standard curve SIM922 and SIM923 Temperature Monitors The SIM922 Diode Temperature Monitor and the SIM923 Platinum RTD Monitor are designed to measure four sensors simultaneously. Based on the modular SIM platform, they provide high-performance and multiple-channel capability in a small footprint. SIM922 Each of the four channels in the SIM922 has an independent, precision 10 µA current source to provide sensor excitation. Measurement results can be displayed in kelvin or volts. SIM923 The four channels in the SIM923 have independent, stable 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 Stanford Research Systems resistor. The current to the sensor can be reversed by the user to test for any offset. Results are displayed in kelvin or ohms. Common Features Both the SIM922 and SIM923 employ four-wire measurement circuits (±I excitation leads, ±V sense leads) making the measurements insensitive to series lead resistance. The four channel excitations are independently controlled and do not switch on or off when the readout is advancing between channels. Sensor excitations can be disabled to reduce power dissipation at sensitive cryogenic stages. This also accelerates readings in the remaining enabled channels. Measurements are performed at rates up to four readings per second. A factory-standard calibration curve is built in for each model. In addition, each channel has non-volatile memory to store a 256-point custom calibration curve to convert sensor units (V or Ω) to temperature units (K).

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SIM922/923Diode & Pt RTD Temperature Monitors-2

Number of inputs 4 4 Sensor type Silicon diode Platinum and other RTDs Measurement type 4-wire 4-wire Excitation 4 constant current sources 4 constant current sources 10 µA ± 0.01 %, ±5 ppm/°C 1.0 mA ± 0.1 %, ±5 ppm/°C Sensor units Volts Ohms Input range 0 to 2.5 V 0 Ω to 1400 Ω (includes excitation lead resistance) Calibration curves 1 std., 4 user-defined curves DIN 43760, 4 user-defined curves 256 points each 256 points each Temperature range Sensor dependent Sensor dependent 1.4 K to 475 K (typ.) 20 K to 873 K (typ.) Display resolution 4 digits 4 digits Interface resolution 1 µV 1 mΩ Measurement...

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