- Available in either 2 or 4-channel configurations.
- Auto-ranged, constant-voltage AC excitation is used to provide robust support for cryogenic Negative Temperature Coefficient (NTC) sensors including Ruthenium-oxide, Carbon-Glass, Cernox™, Carbon-Ceramic, Germanium and several others.
- LabVIEW™ drivers available at no extra charge.
Easy to use: The monitor’s front panel consists of a large, bright TFT-LCD display a 4-key keypad, an audio alarm and three status LEDs. Several display formats may be selected. Additional screens include temperature readings along with relay and alarm status information. A single key press takes the screen to a menu tree where most features and functions of the instrument can be configured. The status of built-in alarms and relays is indicated by LEDs located below the display.
Input Options: The Model 612 has two input channels and the 614 has four. All inputs are identical and independent with each capable of supporting the same wide range of sensor types. Other than the input channel count, there are no differences between the Model 612 and 614.
Input Flexibility: Silicon Diode sensors are supported over their full temperature range by using 10uA constant-current DC excitation. Positive Temperature Coefficient (PTC) resistor sensors including Platinum and Rhodium-Iron RTDs use constant-current, AC excitation. Platinum RTD sensors have built-in DIN standard calibration curves that have been extended to 14K for cryogenic use. Lower temperature use is possible with custom calibrations. Auto-ranged, constant-voltage AC excitation is used to provide robust support for cryogenic Negative Temperature Coefficient (NTC) sensors including Ruthenium-oxide (R400, R500, and RO-600 Series), Carbon-Glass, Cernox™, Carbon-Ceramic, Germanium and several others. Thermocouple sensors are supported by using an optional dual thermocouple module. This module plugs into any of the input channels. It is powered by the instrument to provide amplification, cold-junction compensation and connection to copper.
Input Power: The monitors are shipped with a 12VDC@1A external power supply but may be powered by any source providing 7.5 to 24 Volts AC or DC. The IEEE 802.3af Power-over-Ethernet (PoE) specification is also supported, allowing the monitor to be powered by its local area network connection. Since PoE provides both instrument power and data over a single cable, remote data acquisition and high channel count systems can be simplified. PoE requires the use of a powered hub or power injector. Ethernet cables up to 300 meters may then be used.
Data logging: Data Logging is performed by continuously recording temperature and status to an internal 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. The monitors will log up to 800 samples. Each sample includes readings for all input channels.
Alarms and Relays: Two 10.0A dry-contact relay outputs are available that can be asserted based on temperature setpoints from user selected input channels. These relays are large enough to switch most cryogenic valves. The visual, remote and audible alarms are supported. Each may be programmed to assert or clear based on temperature setpoints. Alarms may be latched. These are asserted on an alarm condition and will remain asserted until cleared by the user. Note: A latched alarm may be cleared by pressing the Right (►) key on the front panel when the Home Status screen is displayed.
Remote Control: Standard Remote Interfaces include 100/10 Ethernet and RS-232. An IEEE-488.2 GPIB interface is optional and may be field installed at any time. The option consists of an external module that is automatically configured by the monitor. A USB 2.0 serial port emulator option is also available. Monitors connect directly to any 100/10 Ethernet Local-Area-Network (LAN). The TCP and UDP data port servers bring fast Ethernet connectivity to data acquisition software including LabView™. Using the SMTP protocol, the monitor will send e-mail based on selected alarm conditions. Using the Ethernet HTTP protocol, the monitor’s embedded web server allows the instrument to be viewed and configured from any web browser.
Remote interfaces implement an IEEE-488.2 SCPI compliant remote command language that is easy to learn and easy to read. LabView™ drivers are available for all remote interfaces.
Remote Command Language: The Monitor’s remote command language is SCPI compliant according to the IEEE-488.2 specification. SCPI establishes a common language and syntax across various types of instruments. It is easy to learn and easy to read.
Command Scripts can be used to completely configure an instrument including setting custom sensor calibration curves and PID tables. Further, scripts can query and test data. They are commonly used in a manufacturing environment to set a baseline state and test a target product. In the laboratory, scripts can be used to save and restore configurations for various experiments. XML (Extensible Markup Language) is used for the structure and format of script files. XML can be generated and edited with a standard text editor. Further, it is easy to read and understand.
Firmware Updates: Full instrument firmware updates may be installed by using the Ethernet connection. Updates are free of charge and generally include enhancements and new features. Contact us today for complete specifications.
- Display is TFT LCD, 4mm and 8mm character height.
- Model 612 has 2 input channels. Model 614 has 4.
- Standard curves for platinum, carbon, and ruthenium-oxide temperature sensors.
- Keypad: 4-key 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: Up to seven significant digits.
- Option 1: IEEE-488.2 Computer Interface.
- Option 2: Rack Mounting Tabs.
|Diode Sensors||PTC Resistor
|Input:||Constant-Current DC||Constant-Current AC||Constant-Current DC||Autoranging Constant-
|Input Range:||0.1V – 2.25V||1.0mA: 0.1 – 750 Ohm
100µA: 1.0 – 7.5K Ohm
10µA: 10 – 75K Ohm
|100K – 225K Ohm||Minimum: 0.5 Ohm
Maximum: 2.0M Ohm
% Rdg ± % Range
|0.004% ± 80μV||0.01% + 0.0005%||0.005% ± 25 Ohm||14-30K: 0.05%+ 0.05%
0.5-2M: 0.15%+ 0.15%
|Resolution: r /> % Range||10μV||0.0003%||0.00004%||0.0003%|
|Excitation:||10μA DC||1.0mA, 100μA, 10μA||10μA DC||10mV 1.25mA to 150nA continuously variable|