Gas Chromatograph

Instrument Introduction:

GC-7960A gas chromatograph is the new type automatic gas chromatograph released by U-Therm International (H.K.) Limited (factory U-THERM Instruments Manufacture Co., Ltd.), it was the improved model of our GC-7960. The instrument adopts large screen LCD monitor, audio-visual display, easy operation. Meanwhile the instrument is with digital interface, through one piece of communication cable realizing real-time data and signal acquisition, data processing and testing result on the computer. The artistic and compact appearance design, equipped with modern computer control technology, which makes GC-7960II become veritable, new type and high-performance gas chromatograph.

Application scope

The machine is suitable for treating He, H₂, O₂, N₂, CH₄, C₂H₆, CO₂, H₂S, C₃H₈, iC₄H₁₀, nC₄H₁₀, iC₅H₁₂, nC₅H₁₂ in natural gas mining, treatment and processing and city gas. The detection concentration punches: 0.01%～100%( volume fraction)。Because of the high detection sensitivity of FID, the degree of Hydrocarbon groups can be measured to PPm.

It is capable of analyzing the Hydrocarbons of C1~C12 and calculate the Calorific value (Optional; not standard supply), Wobbe number (Optional; not standard supply), relative density (specific gravity; optional), compression factor (optional), and etc.

Features

(1)       The instrument adopts large screen LCD technology, audio-visual display, easy operation.

(2)       Self-diagnostic function, show trouble location.

(3)       Touching type keyboard is convenient for the user to set the operating data

The high-performance electronic components were used to improve the stability & 

(1)       precision. The life-span is longer with the extension function is better.

(2)       Data power failure protection function, the operating data set by the instrument could be saved for long time after power failure.

(3)       Has the over temperature protection device. When the temperature is over setting limit, the instrument will stop heating and report malfunction on the display.

(4)       Large screen liquid crystal English display shows the instrument parameter intuitively, greatly convenient for the user to set parameters, such as each channel temperature, heating, detector, bridge current, etc; Intuitively operate the functions, such as FID auto ignition, on-off bridge current, open and close temperature control, open and close heating and each time event, etc.

(5)       Split/splitless inlet system with diaphragm purge function makes the system more stable with better precision.

(6)       Flexible design which can install 4 detectors simultaneously, each detector has independent electronic controller and signal output port.

(7)       Flexible design for connecting different types of pack column and capillary column; 4 columns could be installed at the same time.

(8)       Main control circuit adopts advanced microprocessor, large capacity of Memory, making the data saving more reliable. Meanwhile integrated design that integrating the measurement, control, power supply in one piece of circuit board, improve the anti-interference performance and reliability of instrument.

(9)       Adopt temperature controlling circuit of microprocessor, temperature accuracy of controlled object each heating zone reaches 0.1 degree.

(10)    Intelligent double back opening door technology, ensure that instrument column box temperature has good temperature control accuracy, and could cool quickly.

(11)    With standard 9-steps heating program, expandable to 21 steps program heating, fitting for analysis of complex samples of wide boiling point.

(12)    Unit type integral structure design, convenient installation and maintenance.

Technical Parameters
Column Oven: RT－450℃, precision ±0.01℃(@200℃).
Inlet: RT－450℃, precision ±0.01℃(@200℃).
Detector: RT－450℃, precision ±0.01℃(@200℃).
Up to six channels of temperature control: suitable for multi-channel temperature control needs such as adding reformer.
 Column Oven parameters:
Temperature control accuracy: room temperature8℃－420℃accuracy±0.1℃.
 Column Oven volume:280mm×300mm×280mm.
 Program heating order: 9 steps. (Can be increased to 21 steps)
 Program heating rate:1℃－50℃.
 Constant temperature holding time of each order:0－300min(1min increment)
 Automatic rear door opening design ensures fast cooling.
 High-power, low-noise rotating fan ensures temperature uniformity.

Pneumatic system
 The carrier gas flow rate adopts the double stable design of first stabilized and stabilized flow.
Accurate scale pneumatic control valve parts with high reproducibility and high stability.

Injection method
 Fill the column head to inject.
Packed column gasification injection.
Capillary split/splitless injection: backpressure valve control technology, linear splitting.
Six-way valve gas injection.
Online injection: continuous injection for 24 hours without supervision (patented technology).

High sensitivity detector parameters to ensure data accuracy

Supplying List

Testing Report of Calorific Value

Printing Time：2018/5/7，17:05

Sampling Time：2018/1/13，10:10

Spectrum File：C:\Users\Administrator\Desktop\20160113-001(00002,10;26;07)standard gas.hw

────────────────────────────

1      1.838    Nitrogen     6.866       78471      

2      1.906    Methane     90.05      1200314    

3      2.514    Ethane      0.5004      8137       

4      3.702    Propane     0.5369      6920       

5      5.438    Isobutane    0.5179     18253      

6      6.857    N-butane     0.5472     17624      

7      11.868   Isopentane   0.4995     14611      

8      14.420   N-pentane    0.4878     15231      

────────────────────────────

Total                          100      1359561    

Under standard condition（273.15K、101325Pa）：

The average molecular weight = 18.088.

Gross calorific value = 39.673 (MJ / Nm3) = 9475.673 (KCal / Nm3).

Net calorific value = 35.752 (MJ / Nm3) = 8539.140 (KCal / Nm3).

Wobbe-Index = 50.204 (MJ / Nm3) = 11991.028 (KCal / Nm3), and the burning potential = 75.927.

Density = 0.8069 (kg / m3), relative density = 0.624.

Critical temperature = 192.80 (K), critical pressure = 4.440 (MPa).