Home > Temperature Monitors > Model 12/14 > Specifications
Model 12/14 General Specifications
User Interface
Display Type: Graphics VFD, 10mm character height.
Number of Inputs Displayed: Up 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: Up 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 Excitation: Constant current: 1mA, 100µA or 10µA. Constant voltage: 1.0V, 10mV and 1.0mV RMS with excitation currents from 1.0mA to 200nA.
Resistance Measurement type: Ratiometric bridge.
AC Excitation Frequency: 1.25Hz bipolar square wave.
Sample Rate: 10Hz per channel.
Digital Resolution: 24 bits.
Measurement Drift: <25ppm/°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. The Model 12 will log 1,000 samples and the Model 14 will log 820.
Analog Output
The analog output is a scaled voltage output that is proportional to any selected input temperature. Output Range: Zero to 4.096 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.
Number: 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: 5.6”W x 2.9”H x 8.8”D. Weight: 3.5 Lbs. AC Power Requirement: 110 or 220VAC, +5% to -10%, 50 to 60Hz, 15VA.
Conformity: European CE certified.
Model
12/14 Supported Sensors
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 100Ω or 1,000Ω 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 supplied 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, Carbon-Ceramic 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 1.25Hz 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 read is a function of the selected voltage bias.
| Model
12/14 Supported Sensors |
||
|---|---|---|
Temperature Range |
Example Sensors |
|
Silicon Diode |
1.4 - 500K |
Cryo-con S900, S800 |
GaAs Diode |
25 - 475K |
Scientific Inst. GA-300 |
Platinum RTD |
14 - 1200K |
Cryo-con CP-100 |
Rhodium-Iron |
1.4 - 800K |
Oxford PHZ 0002 |
Cernox™ |
300mK - 325K |
Lakeshore, all types |
Carbon-Ceramic |
4.2K - 300K |
TMi-A1 |
Ruthenium-Oxide |
300mK - 200K |
|
Model 12/14 Input Specifications
Diode
sensors |
PTC
resistor sensors |
NTC resistor sensors |
|
|---|---|---|---|
Excitation Mode |
DC, Constant-current |
DC, Constant-current |
Constant-voltage AC |
Ranges |
2.5V |
PTC 100: 625Ω |
1.0V: 1.0KΩ
to 1.0MΩ |
Accuracy: |
0.005% + 0.003% |
0.01% + 0.00051% |
1,000Ω to
10KΩ: 0.05% + 0.05% |
Resolution: |
0.00004% |
0.0003% |
0.0003% |
Excitation Current |
10µA DC |
1.0mA, 100mA, 10mA |
1.0mA to 200nA,
continuously variable |
| 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. |
|
Tel: (858) 756 3900 Fax: (858) 759 3515
Specifications subject to change without notice. ©Cryogenic Control Systems, Inc. 1998 - 2010. |
Listing
of Supported Sensors