Cryogenic Systems
Ultra-low Temperature Controller DXTC-290
DXTC-290 ultra-low temperature controller supports diodes, thermocouples, platinum resistors and negative temperature coefficient resistance sensors. It can connect up to ten temperature sensors for multi-point testing.
It provides extremely high resolution, accuracy and stability. Communication methods include Ethernet, RS-485 and USB. The sensor uses dual constant current source mode with balanced output and automatic gear shifting at ultra-low temperatures to reduce energy injection and ensure stable operation.
DXTC-290 supports two control loops. Each loop input can associate with any of the ten sensors. It can expand to two 100W heaters or one 200W heater and supports closed-loop temperature control and self-tuning.
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Product Overview
DXTC-290 ultra-low temperature controller supports diodes, thermocouples, platinum resistors and negative temperature coefficient resistance sensors. It can connect up to ten temperature sensors for multi-point testing.
It provides extremely high resolution, accuracy and stability. Communication methods include Ethernet, RS-485 and USB. The sensor uses dual constant current source mode with balanced output and automatic gear shifting at ultra-low temperatures to reduce energy injection and ensure stable operation.
DXTC-290 supports two control loops. Each loop input can associate with any of the ten sensors. It can expand to two 100W heaters or one 200W heater and supports closed-loop temperature control and self-tuning.
Measurement Parameters
- Measurement accuracy: up to 10mK
- Measurement range: down to 300mK (with appropriate NTC RTD sensor)
- Input channels: standard 2, expandable to 10
- Sensor compatibility: diode, Cernox, platinum resistance, thermocouple
- Output control: three heater outputs, ±10V analog output, alarm, relay
- Measurement ADC: 24-bit, 10 readings per second per channel
- Thermoelectric potential compensation supported
- Network operation: up to 247 monitors in one network
Control Parameters
Control loop:
- Loop 1: 100W heater (upgradeable to 200W)
- Loop 2: 1W heater (upgradeable to 100W)
Signal filtering:
- Filter window 1–10%FS
- Filter points 2–64
Control mode:
- Automatic adjustment
- Manual setting
- Regional setting
PID control:
- Ratio 0–1000 (0.1 resolution)
- Integral 0–1000 (0.1 resolution)
- Differential 0–200 (0.1 resolution)
- Manual 0–100% (0.01% resolution)
Regional function:
- Continuous control from 300mK to 1505K
Safety protection:
- Setpoint limit
- Curve temperature limit
- Heating slope limit
- Heater short circuit protection
Human-Computer Interaction
- 5-inch color capacitive touch screen
- Chinese / English interface
- Units: K, ℃, V, Ω
- Resolution: 0.0001K
- Interfaces: Ethernet, RS-485, USB
- RS-485 range: 1200m
- Ethernet: unlimited distance
- Protocol: ECT custom + MODBUS
- LabView driver supported
- Storage: up to 64 temperature curves
Sensor Type Table
| Sensor type | Material | DX model | LS model |
|---|---|---|---|
| Diode | Silicon | DT641.4-325K | DT-6701.4-500K |
| Diode | Gallium aluminum arsenic | TG-1201.4-475K | |
| Positive temperature coefficient Resistance | |||
| Resistance | Platinum | PT10020-500K | PT-10030-800K |
| Resistance | Rhodium-iron | RF501.2-500K | RF-800-44-400K |
| Negative temperature coefficient Resistance | |||
| Resistance | Germanium | GR-200A-10002-100K | |
| Resistance | Penetrating Ceramics | CC8704-500K | |
| Resistance | Glassy carbon | CGR-1-5003-400K | |
| Resistance | Cernox | CX-10302-325K | |
| Resistance | Oxide nails | RX-202A3-300K | |
| DX is the abbreviation of Dexinmag companyLS is the abbreviation of Lakeshore Company | |||
Sensor Input Performance Table
| Sensor type | Silicon diode | Platinum resistor | Cernox | Carburized ceramics |
|---|---|---|---|---|
| Temperature coefficient | Negative temperature | Positive temperature | Negative temperature | Positive temperature |
| Signal category | Voltage V | Ohms (Ω) | Ohms (Ω) | Ohms (Ω) |
| Signal range | 0~2.5V | 0~500Ω | 0~7500Ω | 0~4000Ω |
| Excitation current | 10μA±0.01% | 1mA±0.3% | Automatic shift | Automatic shift |
| Display resolution | 0.1μV | 0.1mΩ | 0.1mΩ | 0.1mΩ |
| Temperature range | 1.4~475K | 20~800K | 2.0~400K | 4~500K |
| Standard curve | LS: curve10DX: curve64 | DIN43760 | Requires calibration | Requires calibration |
| Measurement resolution | 20uV1mK@4.2K11mK@77K10mK@300K10mK@475K | 2mΩ10.6mK@30K10mK@77K10mK@300K10mK@675K10mK@800K | 50mΩ1mK@4.2K10mK@77K10mK@300K | 50mΩ1mK@4.2K33.3mK@77K500mK@300K |
Note 1: The driving principle of dual constant current sources for balanced output, that is, the two current output lines are centered to the ground, effectively suppressing common-mode interference and improving measurement accuracy.
Note 2: Different excitation current ranges are used for different temperature zones of the sensor. The voltage on the sensor is monitored when the voltage exceeds 10 mV, it automatically downshifts to bring the voltage back to 10 mV. This controls the injection energy and ensures stable and reliable operation at extremely low temperatures.
Notes
For detailed specifications, calibration data and application support, please contact MAGTRANS.