Automatic cryogenic vacuum distillation water extraction system LI-2100
Studies analyzing the stable isotopes of water extracted from plants and soils have become routine in the ecological literature. In any given study, dozens to hundreds of water samples are acquired and analyzed because of the temporal and spatial variations that are typically observed in natural ecological systems. With recent advances in mass spectrometry, especial fast laser spectrometry for stable isotope analyzer, water extraction, rather than the isotopic analysis itself, is the bottleneck in sample processing.
Over the past four decades a variety of extraction techniques have been used. Of these methods, azeotropic distillation and vacuum distillation have been the most commonly employed. But for vacuum distillation method, it need add liquid nitrogen repeatedly during operation, complex and low success rate. Azeotropic distillation need to join expensive solvent, which is harmful to our health and pollute the environment. So developing a device which is easy use, operation simple and fully automatic, is the urgent requirement of current isotopes research.
LI-2100 Automatic cryogenic vacuum distillation water extraction system, overcomes the defect of traditional extraction technology. It continues to use cryogenic vacuum distillation principle, but highly modular and integrated. It uses as compressor refrigeration unit without liquid nitrogen, safe and simple. Batch processing samples, 14 samples can be extracted each process. Extraction process is fully automatic.
Principle
This equipment is mainly adopts the principle of cryogenic vacuum distillation. During vacuum distillation, water is evaporated from the sample and condensed in a collection tube. The isotopic signature of water condensing in the collection tube follows a Rayleigh distillation curve16 and, therefore, theoretically, the water extraction must proceed to completion to obtain an unfractionated water sample.
Specification
1 Vacuum system:
Vacuum Gauge: Heat conduction type; Voltage: 24V, Power: ＜1.5W; Range: 1x10-2~1X105Pa; Accuracy: ±10% of reading; Resolution:±1% of reading; Repetitive:±2% of reading
Vacuum pump: Speed: 5L/min; Voltage: 24V; Maximum pressure:0.3bar
Electromagnetic damper valve: 220V, 600W. The leakage rate of valve and seat: ≤1.3×10-7 Pa·L·s-1, Response time: open≤ 0.1s; close≤ 1s
2 Heating system:
Electromagnetic heating: Voltage: 220V, Power: 800W
Thermal conductive plate: Stainless steel
Temperature sensor: PT1000
Heating temperature: 75℃
3 Condensing system:
Cooling trap: DANFOSS compressor, -95℃, Voltage: 200V, Power: 800W, Stainless steel
4 Signal I/O port:
Main control board: Cortex-M3 ARM NXP LPC1778 processor.
Display: 12” TFT LCD (Resolution: 800*480, Displaying Color: 65536）, Touch screen: 5 Wires Resistive Touch screen (More than 35 million finger touches)
Signal input and control: two way, 0 ~ 3.3 V analog signal input, 12 of the AD converter (ADC), speed up to 400 k, DMA transfers. Including:
- 1 temperature signal input
- 1 vacuum rate input
- 1 heating signal output
- 1 cooling signal output
- 1 vacuum pump signal output
- 1 vacuum valve output
- 15 solenoid valve output
5 Alarm function:
- Heating temperature too high or exceed the set point, or not work, heating system automatically power off and alarm
- Refrigeration did not work properly
- Vacuum leak fault
- Processing end prompt
Order
LI-2100 water extraction system: include heater unit, vacuum and control unit, cooling trap, metal extraction sets, condensing glass tube and sampling bottles, etc.
Manufacturer
LI-CA, China
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