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Agilent 7890 gas chromatograph
The Agilent 7890 gas chromatograph is a representative of the level of new technological development and can provide performance for various applicati
Product details
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Agilent 7890 gas chromatographThe system has the characteristics of reliability, durability, and long lifespan. Agilent promises to guarantee the instrument's use for ten years, enabling low-cost operation during use.
performance
• Supports simultaneous installation:
-Two injection ports
-Three detectors (the third detector is TCD)
-Four detector signals
Advanced detector electronics and full range digital data output enable quantitative analysis of peaks across the entire concentration range (FID of 107) of the detector in a single injection.
All injection ports and detectors * * use EPC, and the control range and separation performance of special injection ports and detector components have been optimized.
Up to six EPC modules can be installed, providing EPC control for up to 16 channels.
The pressure setting value and control accuracy reach 0.001 psi, providing a more reliable retention time lock for low-pressure analysis.
EPC for capillary columns has four flow control modes: constant pressure mode and gradient pressure (three-step gradient) mode, constant flow mode or gradient flow (three-step gradient) mode. Calculate the average linear flow rate of the chromatographic column.
Standardized atmospheric pressure and temperature compensation ensure that the test results remain unchanged even when there are changes in the laboratory environment.
When using instrument monitoring and intelligent diagnostic software, and even when connected to a data system, real-time monitoring of the chromatograph can be achieved through a LAN interface.
Enter maintenance and service mode with one click operation from the keyboard.
Pre programmed leak testing.
The automatic liquid sampler is fully integrated into the control of the host.
Parameters and automatic control can be set using the local keyboard or through a network data system. Clock time programming can be initialized through the front panel to initiate an event (on/off, startup method, etc.) at a future date or time.
Each deviation in analysis time is recorded to ensure that all parameters of the analysis method are archived and saved.
Various traditional gas injection and chromatographic column switching valves can be provided.
550 time events can be set.
Display all GC and automatic liquid sampler (ALS) settings on the GC instrument or data system.
Online help related to context.
column oven
•Agilent 7890 gas chromatographSpecification: 28 × 31 × 16 cm. Can accommodate two 105 m x 0.530 mm inner diameter capillary columns or two 10 foot glass filled columns (coiled diameter 9 inches, 1/4 inch outer diameter) or two 20 foot long stainless steel filled columns (1/8 inch outer diameter).
The operating temperature range is suitable for all chromatographic columns and chromatographic separation requirements. Above the ambient temperature by+4 ° C to 450 ° C.
-Cool with LN2 liquid nitrogen: -80 to 450 ° C.
-Cooling with CO2: -40 to 450 ° C.
Temperature setting accuracy: 1 ° C.
• Supports 20 step column box temperature gradient, 21 constant temperature platforms, and gradient cooling.
• * High heating rate: 120 ° C/min (if using a 120V power supply * High heating rate of 75 ° C/min, see Table 1).
• * Long running time: 999.99 minutes (16.7 hours).
Cooling of the column box (at room temperature of 22 ° C) requires 4.0 minutes from 450 ° C to 50 ° C (3.5 minutes when inserting accessories using a column box).
• Environmental temperature sensitivity: When the environmental temperature changes by 1 ° C, the column box temperature changes by less than 0.01 ° C. Electronic Gas Circuit Control (EPC)
The compensation function for atmospheric pressure or environmental temperature changes is standard built-in.
The pressure setting accuracy is 0.001 psi, with a general control accuracy of ± 0.001 within the range of 0.000 to 99.999 psi; Within the range of 100.00 to 150.00 psi, the accuracy is 0.01 psi.
The pressure unit can be selected from psi, kPa, or bar.
• Program boost/boost current: * Third order.
• Optional carrier gas and tail blowing gas types: He, H2, N2, and Ar/CH4.
Each injection port or detector flow or pressure parameter can be set using Agilent 7890A and Agilent chemical workstations.
If the size of the capillary column is input into Agilent 7890A, the carrier gas flow rate can be set to constant flow mode.
The split/non split and programmed temperature vaporization injection ports (PTVs) have flow sensors that control the split ratio.
Injection port module pressure sensor: Accuracy:<± 2% of full scale, reproducibility:< ±0.05 psi，
Temperature coefficient:< ± 0.01 psi/° C, drift:< ± 0.1 psi/6 months.
• Flow sensor: Accuracy:<± 5%, depending on the type of carrier gas used, repeatability: For helium or hydrogen, for every 1 ° C change, the flow rate changes by<± 0.35% of the set value at standard temperature and pressure (NTP) *, and for N2 or Ar/CH4, for every 1 ° C change, the flow rate changes by<± 0.05 mL/min (NTP).
Detector module: Accuracy:< ± 3 mL/min NTP or 7% set value, repeatability:<± 0.35% set value
injection port
• Multiple installation of two injection ports
EPC compensates for changes in atmospheric pressure and temperature
• Type of injection port:
-Gap blowing and filling column injection port (PPIP)
-Split/non split capillary column injection port
（S/SL）
-Program heating cold column head injection port
（PCOC）
-Programmed temperature vaporization injection port (PTV)
-Volatile analysis injection port (VI)
Split/Non Split Injection Port (S/SL)
Suitable for all capillary columns (inner diameter from 50 μ m to 530 μ m).
The split ratio can reach 7500:1 to avoid column overload.
The non diversion mode is used for trace analysis, and the pressure pulse non diversion mode is easy to achieve the best performance.
• High operating temperature: 400 ° C.
EPC can be used in two pressure ranges: 0-100 PSI (0 to 680 kPa), providing good control for chromatography columns with a diameter of £ 0.200 mm; Good control can be achieved for chromatography columns with a diameter of<0.200 mm at 0-150 PSI
The carrier gas saving mode can reduce gas consumption without affecting the performance of the instrument.
The electronic control of the flow rate through the cushion blowing can eliminate ghost peaks.
• Total flow setting range: N2： From 0 to 200mL/min H2 or He: from 0 to 1250 mL/min
Each 7890A S/SL injection port comes standard with a rotary top sealing system, which facilitates quick and easy replacement of the injection port liner.
Cold column head injection port (PCOC)
Directly inject into the capillary column to ensure quantitative transfer of the sample without thermal degradation.
Direct automatic liquid injection onto chromatography columns with an inner diameter of ≥ 0.250 mm.
High operating temperature: 450 ° C, three-stage heating or furnace temperature tracking, with the option to control the temperature to -40 ° C.
Electronic pressure control range: 0 to 100 PSI.
Electronic control of gasket blowing flow.
The optional solvent discharge function is used for large volume injection.
-Electronic control, inertness, three-way valve discharge solvent.
-Including methods for optimizing software.
-Pre install reserved gap pipes/discharge pipes/analysis columns for easy installation.
Diaphragm purge packed column injection port (PPIP)
Directly inject into packed and large-diameter capillary columns.
Electronic flow/pressure control: selectable pressure range from 0 to 100 PSI, flow range from 0.0 to 200.0 mL/min. In order to optimize the performance of the conventional filling column setting range.
Electronic control of gasket blowing flow.
• High operating temperature: 400 ° C.
• Equipped with connectors suitable for connecting 1/4 inch and 1/8 inch packed columns, as well as 0.530 mm capillary columns.
Programmed temperature vaporization injection port (PTV)
A universal injection port for difficult to separate samples, supporting split and non split injection modes for cooling injection and large volume injection.
• Temperature control: Use liquid nitrogen (to -160 ° C) or liquid CO2 (to -65 ° C) for cooling. Third order program heating * high heating rate can reach 720 ° C/min, * high operating temperature: 450 ° C.
The EPC pressure range is 0 to 100 PSI.
The diversion ratio can reach 7500:1.
Electronic control of gasket blowing flow.
• Gerstel non spacer type connector or Merlin Microseal can be selected ® Spacer type connector.
High operating temperature of 450 ° C.
• Total flow setting range:
-0 to 200 mL/min N2
-0 to 1250 mL/min H2 or He
Volatile Substance Analysis Interface (VI)
The interface volume is very small (32 μ L), suitable for analyzing gases or pre vaporized samples. It is recommended to use it together with headspace, sweep capture, or thermal desorption injection.
There are three optimized injection modes: split flow (with a split ratio of up to 100:1), no split flow, and direct injection.
Optimized EPC (using H2 or He as carrier gas, pressure control from 0.00 to 100 PSI, flow control from 0.0 to 100 mL/min).
Electronic control of gasket blowing flow.
• Use Silcosteel ® Processed pipelines should have an inert surface to minimize the adsorption of components.
• High operating temperature: 400 ° C.
detector
All detectors have EPC control and electronic on/off control.
EPC compensates for changes in atmospheric pressure and temperature. Existing detector types:
Flame ionization detector (FID)
Flame ionization detector (FID) responds to the vast majority of organic compounds.
Low detection limit (for tridecane):< 1.8 pg C/s.
Linear dynamic range:>107 (± 10%). The full range digital data output enables quantitative analysis of peaks across the entire concentration range (107) of the detector in a single injection.
The data acquisition rate is up to 500 Hz, suitable for peaks with a half peak width as small as 10 ms.
Standard EPC is used for three gases:
-Air: 0 to 800 mL/min
-Hydrogen: 0 to 100 mL/min
-Tail blowing: (N2 or He): 0 to 100 mL/min
There are two modes to choose from: optimized capillary column or suitable for both packed column and capillary column.
Automatic fire extinguishing detection and automatic re ignition.
• High operating temperature: 450 ° C.
Thermal conductivity detector (TCD)
Thermal conductivity detector (TCD) is a universal detector that responds to all compounds except for the carrier gas.
Low detection limit: 400 pg propane/mL, using helium as the carrier gas (low detection limit may be affected by laboratory environment).
• Linear dynamic range:> 105 ± 5%.
Unique fluid switching design, quickly reaching balance and low drift from the start switch.
For components with thermal conductivity higher than that of the carrier gas, signal polarity program control can be performed.
• High operating temperature: 400 ° C.
Standard EPC for two types of gases (helium, hydrogen, argon, or nitrogen that match the carrier gas type).
Tail blowing: 0 to 12 mL/min.
Reference gas: 0 to 100 mL/min.
7890A GC can install a third detector TCD on the left side of GC.
Microcell Electron Capture Detector (Micro ECD)
Micro ECD (Micro Electron Capture Detector) is highly sensitive to electronegative compounds, such as organic compounds containing halogens.
• Low detection limit:< 6 fg/mL Lindane.
Signal linearization, linear dynamic range: for Lindane>5 × 104.
Data acquisition rate: * up to 50 Hz.
• Radioactive source:< 15 mCi of 63Ni ß rays.
Unique micro pool design minimizes pollution and optimizes sensitivity to the greatest extent possible.
• High operating temperature: 400 ° C.
Standard EPC tail blowing type: argon/5% methane or nitrogen; 0 to 150 mL/min.
Nitrogen phosphorus detector (NPD)
Nitrogen phosphorus detector (NPD) has high selectivity for compounds containing nitrogen or phosphorus.
• Low detection limit:< 0.4 pg N/s，< 0.2 pg P/s, measured using a mixture of azobenzene and octadecane sample.
• Dynamic range:> 105 N，> 105 P, measured using azobenzene/mixture sample.
• Selectivity: 25000 to 1 g N/g C, 75000 to 1 g P/g C, determined using azobenzene/octadecane mixture samples.
Data acquisition rate: * up to 200 Hz.
Standard EPC for three gases:
-Air: 0 to 200 mL/min
-H2: 0 to 30 mL/min
-Tail blowing: 0 to 100 mL/min
• Can use packed/capillary columns or optimized capillary columns.
• High operating temperature: 400 ° C.
The ability to generate fire signals can be achieved through the simultaneous use of DFPD, top mounted GC detector, and TCD. Sulfur chemiluminescence detector (SCD) (355 type)
Has high sensitivity and selectivity towards sulfur-containing compounds.
Low detection limit: generally<0.5 pg/s, determined using a toluene solution of dimethyl sulfide
• Linear dynamic range:> one hundred and four
• Selectivity:> 2 x 107 g S/g C
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