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Model18 General Specifications
User Interface
Display Type: Graphics VFD, 4mm character height.
Number of Inputs Displayed: Eight.
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 eight identical input channels, each may be independently configured for any of the supported sensor types.
Sensor Connection: 4-wire differential. DB-9 receptacle.
Sensor Types: See supported sensors table.
Sensor Selection: Front Panel or remote interface.
Sensor Excitation: DC constant-current: 1mA, 100µA or 10µA.
Resistance Measurement type: Ratiometric bridge.
Resistance Range: 1Ω to 250KΩ.
Sample Rate: 0.8Hz per channel.
Digital Resolution: 24 bits.
Digital Accuracy: 0.0015% of full scale.
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, 40K 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 18 will log a maximum of 1,000 entries where each entry contains eight temperature readings.
Status Indicators
Alarm LED on the front panel indicates a programmable alarm condition based on input temperature.
Remote Interfaces
Ethernet: Connects to any 10/100 Base-T Ethernet type Local Area Network. Electrically isolated. Connection and activity indicators on rear panel. IP address and sub-net mask are user configurable. 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.
Language: Remote interface language is IEEE SCPI compliant.
LabView™ Drivers are available.
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, 10W.
AC Power Switch: Rear panel.
Conformity: European CE certified.
Calibration: NIST traceable.
Model
18 Supported Sensors
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.
Platinum RTD sensors can use built-in DIN 43760 (IEC
750) standard setups for 100Ω or 1,000Ω devices. The Model
18 uses the DIN standard for temperatures from 70K to 1020K and extends
it for cryogenic use. Operation down to 14K is possible with user supplied
curves. A unique feature 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.
Negative Temperature Coefficient (NTC) sensors commonly used in cryogenic applications include Ruthenium-Oxide, Cernox™, Carbon Ceramic and several others. These sensors are supported by using a 10μA constant-current DC excitation with a 2.50V or 0.31V input range.
| Model
18 Supported Sensors |
||
|---|---|---|
Temperature Range |
Example Sensors |
|
| Diode | 1.4 - 500K | Cryo-con S900 SI-440, 430, 410 Lakeshore DT-670, 470 |
| Platinum RTD | 14 - 1200K | Cryo-con CP-100 Cryo-con GP-100 Cryo-con XP-100 Cryo-con XP-1K |
| Rhodium-Iron | 1.4 - 800K | Oxford PHZ 0002 |
| Cernox™ | 2.0K - 325K | Lakeshore, all types |
| Carbon-Ceramic | 4.2K - 300K | TMi-A1 |
| Ruthenium-Oxide | 2.0K - 200K | Cryo-con R400 Cryo-con R500 |
Model 18 Input Specifications
Diode sensors |
PTC resistor sensors |
NTC resistor sensors |
|
|---|---|---|---|
Excitation Mode |
DC, Constant-Current |
DC, Constant-Current |
DC, Constant-Current |
Ranges |
2.5V |
2.5KΩ, 25KΩ, 250KΩ |
250KΩ |
Accuracy: |
0.005% + 0.001% |
0.021% + 0.001% |
0.021% + 0.001% |
Resolution: |
0.00004% |
0.0003% |
0.0003% |
Excitation Current |
10µA DC |
1.0mA, 100mA, 10mA |
10µA |
| 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 - 2011. |
Listing
of Supported Sensors