Cryogenic Temperature Monitors
Contents
1. Innovative Solutions in Cryogenic Instrumentation Cryogenic Temperature Monitors Model 12 and Model 14 Two or four input channels with Ethernet connectivity Cryo con s Model 12 and 14 are the most flexible and accurate temperature monitors currently available These two or four channel monitors have a level of sophistication not found in other products Virtually any cryogenic temperature sensor from any manufacturer can be selected by a single setting of the front panel Additional custom or specially calibrated sensors require only a simple setup procedure In addition to its high accuracy performance and low noise design unique features include Constant Voltage AC sensor excitation Internal Data Logging Ethernet Connectivity a large easy to read display and extensive utility software Ethernet connectivity adds a new dimension of utility to these monitors In both industrial and laboratory applications Ethernet is more reliable and easier to use compared to other communication standards Furthermore it is essential to remote distributed sensor or Local Area Network based systems 2050 cor 12 temperature Monitor e Two models available The Model 14 has four e High speed Ethernet interface Electrically input channels and the Model 12 has two All isolated channels are identical in function aise Hoe e Built in web server Temperature monitoring e Multipurpose input channels support Diode and instrument configur2. Input Channel A Input Channel B Input Channel C Input Channel D 5 x Go Internet Software Utility software is provided that connects any Windows based personal computer to either monitor This software provides a graphical control panel that greatly simplifies instrument setup and configuration Sensor calibration curves may be downloaded to the monitor viewed and edited Most file formats are directly supported and can be easily converted to Cryo con s standard format LabView LabView drivers are provided for both the Ethernet TCP IP and RS 232 interfaces Rear panel connections Input Connectors Two DB 9 recepticals provide 4 wire measurement connection to two sensors each LAN Standard RJ 45 Ethernet connector with cee np 4 100 120VAC built in connection and activity LEDs Cryogenic Control Systems Inc 50 60Hz rg ie Temperature Monitor ax RS 232 Null modem connector DB 9 pins in USA Inputs C D R5 232 Relays Analog Output 6 pin detachable RRG terminal block 3 5mm 0 o LAN AC Power RFI filtered Power Entry Module Inputs_A B Aout Rly 1 Rly 2 including AC power line switch and fuse drawer Jo bh Eel le Line voltage selection is performed by internal jumpers Fuse 3AG 1 0A Ordering Information Model 12 110 Two channel monitor set for 90 to 120VAC Model 12 220 Two channel monitor set for 200 to 240VAC Model 14 110 Four channel
3. precise cost effective measurements in laboratory or industrial environments as well as in remote distributed data acquisition systems The Model 12 14 can even be connected directly to the Internet with a user supplied IP address Using the Ethernet HTTP protocol the monitor s 3 Cryo Con Model 14 Temperature Monitor Microsoft Internet Explorer With Ethernet connectivity the user has complete control of the monitor by using any web enabled device from desktop PC to a wireless Pocket PC It is platform and operating system independent working equally well with Windows Linux or Macintosh based computers There are no expensive cards or cables and best of all no confusing configuration requirements E Cryo Con Model 14 Temperature Monitor Microsoft Internet Explorer File Edit view Favorites Tools Help Bak gt A Qsearch GaFavorites meda lt 4 B GSI a Address B http 192 168 0 4finputchans htm gt File Edit View Favorites Tools Help Back amp A ASearch Favorites meda 4 B GSI a Address http 192 168 0 4 TIN le Paar r bd i Cryo con Model 14 Cryogenic Temperature Monitor Channel A Channel B Channel C Channel D 361 144 K High and Low Alarm 302 942 K 301 508 K 300 613 K Relay 1 Source ChA Status High and Low Relay 2 Source ChC Status Off gp Internet embedded web server allows the instrument to be
4. viewed and configured from any web browser An example Status page is shown here Input channels can be configured using text entry and drop down box selections by going to the monitor s Inputs web page Using the SMTP protocol the monitor will send e mail based on selected alarm conditions E mail is completely configured by using the web page interface The TCP IP data port server brings fast Ethernet connectivity to all common data acquisition software programs including LabView TCP IP protocol is used to implement a text based command language like those commonly used with IEEE 488 or RS 232 interfaces This is the primary way that user software interfaces to the monitor The remote command language is SCPI compliant according to the IEEE specification we YI TERIN 2N Cryo con Model 14 Cryogenic Temperature Monitor Name Stage 1 Units K 7 Sensor Pt100 385 High Alarm 400 000 Enable Yes Low Alarm 150 000 Enable Yes Update Cancel Name Cooler Units K 7 Sensor CD 1 2A Diode High Alarm 200 000 Enable No gt Low Alarm 20 0000 Enable No Update Cancel Name Sample Units K gt Sensor RuOx 1K Ohm gt High Alarm 300 000 Enable No gt Low Alarm 30 0000 Enable No Update Cancel Name Shield Units K 7 Sensor RuOx 1K Ohm High Alarm 400 000 Enable No Low Alarm 40 0000 Enable No gt Update Cancel
5. Specifications subject to change without notice
6. ation can be performed Platinum RTD and cryogenic NTC resistive using any web browser temperature sensors e TCP IP User Data Socket for complete remote e Constant Voltage AC excitation of resistive operation using a simple IEEE 488 like sensors increases temperature range and command language improves sensitivity e SMTP interface sends e mail on a selected e Analog voltage output plus two programmable alarm condition dry contact relays e LabView drivers available for both the Ethernet e Continuous data logging into internal Non TCP IP and serial port Volatile memory Flexibility Tne Model 14 has four independent and identical multi purpose sensor inputs whereas the Model 12 has two Each can be easily configured to support virtually any cryogenic temperature sensor Configuration is performed from the instrument s front panel or a remote interface There are no jumpers trim pots or switches Silicon Diode sensors from Cryo con or any other manufacturer are directly supported over their full 1 4 to 500K range using built in calibration curves and sensor data Plus non volatile Flash memory is available for several custom or calibrated sensors Platinum RTD sensors can use built in DIN 43760 IEC 750 standard setups for 100Q or 1 000 devices The Model 12 14 uses the DIN standard for temperatures from 70K to 1020K and extends it down to 30K for cryogenic use Operation down to about 14K is available using user suppl
7. ed in a large easy to read 10mm two line font Underlying menus switch to a 5mm high four line font for more content Additionally the Model 14 can display all four inputs plus alarm and relay status in this smaller font Temperature displays are autoranged to show the most number of significant digits Built in digital filters can be used to smooth temperature data Displays are in units of K C F Volts or Ohms The status of built in alarms and relays are indicated by LEDs located to the right of the display Complex operations such as installing a new sensor require a remote interface connection Outputs The Model 12 14 each have two dry contact relay outputs Either may be independently programmed to assert or clear based on a high or low temperature condition Normally open contacts are available on the rear panel Also available is a single analog output channel This is a zero to 4 Volt output that is proportional to any selected input Data logging is performed by continuously recording temperature and status to an internal 20K byte circular memory buffer Data is time stamped so that the actual time of an event can be determined Non volatile memory is used so that data will survive a power failure Ethernet The Model 12 14 connects directly to any 10 BaseT Ethernet interface to make measurements easily and economically just about anywhere Simple connection to any existing Local Area Network allows stable
8. ied curves A unique feature of these monitors is the use of a ratiometric resistance bridge technique to measure Platinum RTD sensors This significantly reduces low frequency noise and drift to provide rock solid measurements These monitors provide robust support for the Negative Temperature Coefficient NTC sensors commonly used by cryogenic applications They include Ruthenium oxide Cernox Carbon Glass Germanium and several others Since they have a negative temperature coefficient the 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 An additional advantage to constant voltage biasing is that NTC resistors lose sensitivity in the upper part of their range By auto ranging excitation current to maintain a constant voltage sensitivity and noise immunity in that range is greatly improved Sensor excitation used in conjunction with the constant voltage feature is a 2 5Hz bipolar square wave This effectively cancels thermal EMF induced offset errors that sometimes occur in cryogenic systems The maximum and minimum sensor resistance that can be Resistance Range Table j Voltage Min Max read is a the selected 10 0mV voltage bias 3 33mV 430KQ Accuracy Measurement accuracy is obtained by usi
9. ital Resolution 24 bits Digital Accuracy 0 0015 of full scale Measurement Drift lt 15ppm C Measurement Filter 0 5 1 2 4 8 16 32 and 64 Seconds Calibration Curves Built in curves for industry standard sensors plus four user curves with up to 200 entries each Interpolation is performed using a Cubic Spline Data Logging Data logging is performed to an internal 20K byte circular buffer and is time stamped with a real time clock Buffer memory is non volatile and will retain valid data without AC power Options and Accessories Included Accessories 3038 029 User s Manual 4034 029 Utility software CD 04 0302 Relay Connector 4034 038 Dual sensor input connector cable assembly 04 0310 Detachable 120VAC Line Cord Certificate of Calibration Optional Accessories 4012 040 Panel Mount hardware 04 0420 RS 232 Null Modem cable 4034 033 Shielded sensor connector kit 700 series Silicon Diode temperature sensor CP 100 series ceramic Platinum RTD temperature sensor GP 100 series glass Platinum RTD temperature sensor Analog Output The analog output is a scaled voltage output that is proportional to any selected input temperature Output Range Zero to 4 Volts Output Impedance 500 Ohms Digital Resolution 0 0015 of full scale range Connection Detachable terminal block Relay Outputs Each relay output may be programmed to assert upon detection of a high or low temperature on any selected input channel Nu
10. mber Two Dry Normally Open contacts Contact Rating 30VDC at 1A Connector Connection 6 pin detachable terminal block Remote Interfaces Ethernet 10 BaseT Electrically isolated TCP IP user data socket provides remote control and interface to common data acquisition software by using an ASCII command language HTTP provides built in web server SMTP sends e mail based on user selected alarm conditions RS 232 Serial port is an RS 232 standard null modem Data Rates are 9600 38 400 and 57 600 Baud Language Remote interface language is IEEE SCPI compliant on both the TCP IP and RS 232 interface LabView Drivers are available for the Ethernet TCP Data Socket and RS 232 interfaces 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 5 Lbs AC Power Requirement 110 or 220VAC 5 to 10 50 to 60Hz 30VA AC Power Switch Rear panel Conformity European CE certified Contact Information Cryogenic Control Systems Inc PO Box 7012 Rancho Santa Fe CA 92067 Tel 858 756 3900 Fax 858 759 3515 E mail sales cryocon com Web www cryocon com 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 Cryogenic Control Systems Inc 2005 M121105
11. monitor set for 90 to 120VAC Model 14 220 Four channel monitor set for 200 to 240VAC 800K 0 36Q K mee 300K 0 39Q K 77K 0 420 K 30mV K 30K 0 190 K Sensor Sensitivity Measurement Accuracy Temperature Measurement Accuracy Measurement Resolution 800K 5 1mK Temperature 300K 4 7mK Resolution 77K 1 1mK 30K 2 4mK Power 4 2K 30K 3 7uW 30K 77K 20uW TTK ag 17uW Dissipation 77K 12u W 370nW 2 0uW resistance S20KQ K 1260Q K 4220 K DAON Os 0 01Q K 240KQ K 2290Q0 K 2 15Q K 0 16Q K 1 4K 1 1nW 4 2K 20nW 1 0K 42nW 1 4K 962pW 4 2K 73nW 4 2K 171nW Moderate lt 1 for H lt 2T 40mV Constant Voltage excitation Silicon Diode sensors use a fixed excitation current of 10uA and an input voltage range of 0 to 2 5V Both 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 Excitation currents are 1 0mA 100uA and 10uA DC Corresponding full scale resistance ranges are 3129 3 2KQ and 31KQ NTC sensors include Ruthenium Oxide Carbon Glass Germanium and Cernox Constant voltage AC sensor excitation allows the use of these sensors over an extended temperature range Excitation voltage selections are 10mV and 1 0mV GaAlAs and GaAs Diode sensors are supported from 25 to 475K The maximum input
12. ng a 24 bit analog to digital conversion Accuracy is further enhanced by extensive use of Digital Signal Processing DSP techniques The Model 12 14 include built in curves that support most industry standard temperature sensors Additionally four user calibration curves are available for custom or calibrated sensors Each curve may have up to 200 entries The accuracy of any sensor can be greatly improved by the use of Cryo con s CalGen feature This will fit a Diode Platinum RTD or NTC resistor sensor s calibration curve at up to three user specified temperature points It is a built in easy to use method for obtaining higher accuracy temperature measurements without expensive sensor calibrations Lowest Noise These monitors were designed for use in extremely low noise environments that cryogenic systems often require Linear mode power supplies are used throughout and sensor excitation current sources are not multiplexed The enclosure is all Aluminum with wide conductive overlaps on all mating metal surfaces so that radiated RFI noise is virtually eliminated An effective shielding and grounding scheme further allows the user to minimize both conducted and radiated noise Easy to uSe The Model 12 14 front panels consists of a large bright Vacuum Fluorescent display and a 5 key keypad Most features and functions can be accessed via this simple and intuitive menu driven interface Two temperature readings can be display
13. voltage range of the monitor imposes this limitation Cryo con S700 Scientific Inst Sl 410 Lakeshore DT 670 GaAs D 25 475K Scientific Inst GA 300 14 1200K 1 4 500K a e Specifications User Interface Display Type Graphics VFD 10mm character height Number of Inputs Displayed Two to four Keypad Sealed Silicon Rubber Temperature Display Six significant digits autoranged 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 input channels on the Model 12 and four on the Model 14 each may be independently configured for any of the supported sensor types Sensor Connection 4 wire differential DB 9 receptacle Sensor Types See Supported Sensor Table Sensor Selection Front Panel or remote interface Sensor Resolution Sensor Dependent See Sensor Performance Data table Sensor Excitation Constant current 1mA 100uA or 10uA Constant voltage 10mV 3 3mV and 1 0mV RMS with excitation currents from 1 0mA to 10nA in steps of 5 of power Resistance Measurement type Ratiometric bridge Resistance Range Constant voltage resistance measurement range 10Q to 350KQ AC Excitation Frequency Resistor sensors in constant voltage mode 2 5Hz bipolar square wave Sample Rate 10Hz per channel Measurement Resolution Sensor Dependent See Sensor Performance Data table Dig
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