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| Data Sheet (PDF) | Model 44 / 42 Cryogenic Temperature ControllersSpecifications |
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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 two (Model 42) or four (Model 44) 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. Bridge Modes: Passive, Constant-Current, Constant-Voltage. Bridge type: Ratiometric resistance ½-bridge. Differential excitation. DC coupled. AC Excitation Frequency: All resistor sensors: 3.25Hz bipolar square wave. Sample Rate: 15Hz per channel. Digital Resolution: 24 bits. Measurement Accuracy: See input specifications table. Measurement Drift: 15ppm/°C. 25ppm/°C in the Meg-ohm resistance range. Isolation: Input channel circuits are electrically isolated from all other internal circuitry. Measurement Filter: 0.5, 1, 2, 4, 8, 16, 32 and 64 Seconds. Calibration Curves: Built-in curves for industry standard sensors plus six 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: Four output ranges of 1.0A, 333mA, 100mA and 33mA full-scale, which correspond to 50W, 5.0W, 0.5W and 50mW when used with a 50-Ohm 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 compliance is 25V. Ranges: Two output ranges of 450mA and 140mA full-scale, which correspond to 10W and 1.0W into a 50-Ohm load. 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 42/44 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 42/44 is continuously variable so there are no significant steps in sensor self-heating. Voltage excitation values are 100mV, 10mV, 1.0mV and 10µV. 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. |
