DXTC-290TempController
DXTC-290Controller-3

Ultra-low Temperature Controller

The DXTC-290 temperature controller has extremely high resolution, accuracy, stability and other characteristics, and is at the advanced level in the industry. At the same time, it has multiple communication methods such as Ethernet, RS-485, and USB, with long data transmission distances and convenient and flexible data collection. The sensor adopts dual constant current source mode with balanced output. The constant current source can automatically shift gears at extremely low temperatures, reducing the energy injected into the sensor and ensuring stable and reliable operation of the sensor.

 

DXTC-290 Ultra-low Temperature Controller has two control loops at the same time. The input of each loop can be associated with any one of the ten sensors. It can be expanded to up to two 100W or one 200W low-noise heater, which can realize various modes. Closed-loop temperature control and self-tuning function make operation simpler and faster.

 

DXTC-290 ultra-low temperature temperature controller

 

Measurement parameters

 

◆ Measurement accuracy: The optimal measurement accuracy can reach 10mK;

◆ Measurement range: Using an appropriate NTC RTD sensor, the measurement range can be as low as 300mK;

◆ Input channels: Two sensor input channels are standard, which can be expanded to up to 10, and each has an independent temperature curve;

◆ Sensor compatibility: diode temperature sensor, Cernox temperature sensor, platinum resistance temperature sensor, thermocouple sensor, etc.;

◆ Output control: three independent heater outputs, supporting ±10V analog voltage output, alarm and relay control;

◆ Measurement ADC: 24bit, update rate, 10 readings per second per channel;

◆ Thermoelectric potential compensation: supports the thermal electromotive force compensation function of resistance sensors;

◆ Network operation: Multiple units can be operated in a network. A single network allows up to 247 monitors to run at the same time.

 

Control parameters

 

◆ Control loop: It has dual control loops, the first loop is a low-noise heating power supply of 100W or upgraded to 200W, and the second loop is a low-noise heating power supply of 1W or upgraded to 100W;

◆ Signal filtering: filter window 1-10%FS, filter point number 2 to 64;

◆ Control mode: automatic adjustment, manual setting, regional setting;

◆ PID control: Ratio 0 to 1000, setting resolution of 0.1; 

          Integral 0 to 1000, setting resolution of 0.1;

          Differential 0 to 200, setting resolution of 0.1;

          Manual 0 to 100%, 0.01% setting resolution.

◆ Regional function: Automatically switch sensor input, continuous measurement and control from 300mK to 1505K;

◆ Safety protection: temperature set point limit, curve temperature limit, heating output slope limit, heating power gear limit, heating off when powered on, heater short circuit protection.

 

Human-computer interaction

 

◆ Display: 5'' color capacitive touch screen;

◆ Display mode: Chinese and English, multiple temperature units of K, ℃, V, Ω;

◆ Temperature display resolution: 0.0001K;

◆ Communication interface: standard Ethernet, RS-485, USB interface;

◆ Communication range: The transmission distance of RS-485 interface can reach 1200 meters, and the distance of Ethernet interface is basically unlimited;

◆ Communication protocol: supports ECT custom protocol and standard MODBUS protocol;

◆ Software support: Provide LabView driver;

◆ Data storage: allows storage of up to 64 temperature curves, including 20 curing standard temperature characteristic curves.

 

 

Sensor

 

Sensor type Material DX model LS model
Diode Silicon DT64
1.4-325K
DT-670
1.4-500K
Gallium aluminum arsenic   TG-120
1.4-475K
Positive temperature coefficient
Resistance
platinum PT100
20-500K
PT-100
30-800K
Rhodium-iron RF50
1.2-500K
RF-800-4
4-400K
Negative temperature coefficient
Resistance
Germanium   GR-200A-1000
2-100K
Penetrating Ceramics CC870
4-500K
 
Glassy carbon   CGR-1-500
3-400K
Cernox   CX-1030
2-325K
Oxide nails   RX-202A
3-300K
DX is the abbreviation of Dexinmag company
LS 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 0.1mQ
Temperature range 1.4~475K 20~800K 2.0~400K 4~500K
Standard curve LS:curve10
DX: curve64
DIN43760 Requires calibration Requires calibration
Measurement
resolution
20uV
1mK@4.2K
11mK@77K
10mK@30OK
10mK@475K
2mQ
10.6mK@30K
10mK@77K
10mK@300K
10mK@675K
10mK@800K
50mΩ
1mK@4.2K
10mK@77K
10mK@300K
50mΩ
1mK@4.2K
33.3mK@77K
500mK@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 After 10 mV, it automatically downshifts to bring the voltage back to 10 mV. This can control the injection energy of the sensor and ensure stable and reliable operation of the sensor at extremely low temperatures.

 

 

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Operating Manual of DXTC-290 Temperature Controller

 

DXTC-290 ultra-low temperature temperature controller can support diodes, thermocouples, platinum resistors and negative temperature coefficient resistance sensors, and can be connected to up to ten temperature sensors to achieve the experimental purpose of multi-point testing.
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