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| Data Sheet (PDF) | Model 24 Cryogenic Temperature Controller |
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| User Interface Display Type: 20 x 2 character VFD, 9mm character height. Number of Inputs Displayed: One to Four. Keypad: Sealed Silicon Rubber. Temperature Display: Six significant digits, auto-ranged. Display Update Rate: 0.5 Seconds. Display Units: K, C, F or native sensor units. Display Resolution: User selectable to seven significant digits. Input Channels There are four input channels, each of which may be independently configured for any of the supported sensor types. Sensor Connection: 4-wire differential. DIN-6 Connector. Sensor Types: See Supported Sensor Table. Sensor Selection: Front Panel or remote interface. There are no internal jumpers or switches. Input Configurations: See input specifications table. Sensor Excitation: Constant current: 1mA, 100mA or 10mA. Constant voltage: 1.0V and 10mV RMS. Excitation Current: 1.0mA to 1.0µA in steps of 5% of power. Resistance Measurement type: Ratiometric bridge. Resistance Range: Constant-voltage, Maximum resistance: 10mV = 10K-Ohm, 1.0V = 1.0M-Ohm. AC Excitation Frequency: Resistor sensors in constant-voltage mode: 1.25Hz bipolar square wave. Sample Rate: 15Hz per channel. Thermocouples: Factory installed option
on two channels only. All types supported. Digital Resolution: 24 bits. Measurement Accuracy: See input specifications table. Measurement Drift: 15ppm/°C. Isolation: Input channel circuits are electrically isolated from all other internal circuitry. Measurement Filter: 0.5, 1, 2, 4, 8, 16, 32 and 64 S. Calibration Curves: Built-in curves for industry standard sensors plus eight user curves with up to 200 entries each. Interpolation is performed using a Cubic Spline. CalGen™:Calibration curve generator fits any Diode or resistor sensor curve at 1, 2 or 3 user specified temperature points. Control Outputs Number of Independent Control Loops: Two. Control Input: Any sensor input. Loop Update Rate: 15Hz per loop. Isolation: Control loop circuitry is electrically isolated from all other internal circuitry. Control Type: PID table, Enhanced PID, Ramp or Manual. Autotune: Minimum bandwidth PID loop design. PID Tables: Six user PID tables available for storage of setpoint and heater range vs. PID and heater range. 16 entries/table. Set-point Accuracy: Six+ significant digits. Fault Monitors: Control loops are disconnected upon detection of a control sensor fault or excessive internal temperature. Over Temperature Disconnect: Heater may be relay disconnected from user equipment when a specified temperature is exceeded on any selected input. |
Loop #1 Primary Heater Output Type: 50-Watt short circuit protected linear current source. Maximum compliance is selectable at 25V or 50V. Ranges: Three output ranges of 1.0A, 333mA and 100mA full scale, which correspond to 50W, 5.0W and 0.5W when used with a 50W load. Load Resistance: Selectable at 25-Ohm or 50-Ohm. Minimum Load: 10-Ohm in 25W setting,
40-Ohm in 50W setting. Resolution: 1.0ppm of full-scale power Readbacks: Heater output power, Heatsink temperature. Loop #2 Heater Output Type: 10 Watt, short circuit protected linear current source. Maximum output is 0.45A at 25V. Load Resistance: 50-Ohm for 10-Watt output. Minimum Load: 10-Ohm. Resolution: 1.0ppm of full-scale power (20 bits). Readbacks: Heater output power, Heatsink temperature. Status Outputs Audible and Visual Alarms: Independent audible remote and visual alarms. Status reported via Remote Interface: Sensor fault, Heater over temperature fault. Remote Interfaces Remote interfaces are electrically isolated to prevent ground loops. Ethernet: Connects to any Ethernet type Local Area Network. Electrically isolated. TCP/IP user data socket provides remote control by using an ASCII command language. HTTP provides built-in web server for configuration via any web browser. SMTP sends e-mail based on alarm conditions. RS-232: Serial port is an RS-232 standard null modem. Data rates are 9600, 19,200, 38,400 and 57,200 Baud. IEEE-488 (GPIB): Full IEEE-488.2 compliant. Remote Programming Language: IEEE-488.2 SCPI compliant. LabVIEW™ drivers available for all interfaces. User Setups Four User Setups are available that save and restore the complete configuration of the instrument. General Ambient Temperature: 25°C ± 5°C for specified accuracy. Mechanical: 8.5”W x 3.5”H x 12”D. One half-width 2U rack. Instrument bail standard, rack mount kit optional. Weight: 9 Lbs. Power Requirement: 100, 120, 220 or 240VAC +5% -10%. 50 or 60Hz, 150VA. Conformity: European CE certified. Calibration: NIST traceable. |
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| Silicon Diode sensors use a fixed excitation current of 10µA and an input voltage range of 0 to 2.25V. Negative and Positive Temperature Coefficient (NTC) / (PTC) resistor sensors are supported using a ratiometric bridge technique to cancel low frequency noise. PTC sensor types include Platinum and Rhodium-Iron. These sensors are supported by a passive AC resistance bridge. Resistance ranges are: 100-Ohm, 1.0K-Ohm and 10K-Ohm. The Model 24 provides robust support for the Negative Temperature Coefficient (NTC) sensors commonly used by cryogenic applications. They include Ruthenium-oxide, Carbon-Glass, Cernox™, Carbon Ceramic, Germanium and several others. Since these sensors have a negative temperature coefficient, the use of a constant-voltage measurement method will reduce, rather than increase, power dissipation in the sensor as temperature decreases. By maintaining the lowest possible power level, sensor self-heating is minimized and useful temperature range is greatly increased. The excitation source in the Model 24 is continuously variable so there are no significant steps in sensor self-heating. Voltage excitation values are 1.0V and 10mV. Excitation frequency is 3.25Hz. |
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| CalGen™ and Cryo-Con™ are registered
trademarks of Cryogenic Control Systems, Inc. All other product and company
names are trademarks or trade names of their respective companies. |
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Tel: (858) 756 3900 Fax: (858) 759 3515 sales@cryocon.com
Specifications subject to change without notice. ©Cryogenic Control Systems, Inc. 1998 - 2008. |
