Integrating Detectors

Detector Integrated amperometric with gold electrode... 

The equipment consisted of two Waters (Waters Corp. Milford, MA) M-45 pumps, a Waters 481 UV detector, a six-port Valeo sampling valve (A2L6P) with 0.08" holes in the valve body and rotor, a Rheodyne Model 7413 injection valve with a 1-pl loop, a valve interface box, and a Digital Equipment LSI-11/23-based microcomputer system. The microcomputer was used to control all valves, collect raw data from the UV detector, integrate the chromatogram, and store and plot results. 

Waters Corp., Thermabeam Mass Detector (Integrity System Publications), Waters Corp., Milford, MA... 

Autozero—Detector, integrator, or computer function capable of setting detector signal value (baseline ) to zero. 

The solvent gradient delivery is via a HP 1050 LC system equipped with a 100 position extended tray and a HP Diode-array detector integrated and controlled by a single-quadrupole mass spectrometer running MassLynx on Windows NT. The system is accessed via a separate Login PC through OpenLynx (Fig. 5.5). 

Figure 3. Efficiency of plasma background subtraction. Spectra obtained after on-detector integration for 1.6 s. Key a, spectrum of 10 pg/mL Ti b, detector and spectral background and c. net difference spectrum.

Maximum wavelength for this on-detector integration time. 

Detector E, Dionex pulsed electrochemical detector, integrated timperometry mode, 1.4 mm gold working electrode with 0.005 inch gasket, El -t0.07 V, tl 400 ms, E2 -1-0.70 V, t2 120 ms, E3 1.00 V, t3 300 ms, stainless steel counter electrode, Ag/AgCl reference... 

Column /.i-Bondapak column 5pm silica-ODS, 250mm x 4.6mmi.d. Chromatograph, detector, integrator and injector system requirements as Experiment 26. 

Figure 4.24 IR microscope schematic with the detector integrated into the microscope. The microscope is usually coupled to a light port on the side of the FTIR spectrometer. The FTIR spectrometer supplies a modulated, collimated beam of light to the microscope. Courtesy of PerkinElmer Instruments, Shelton, CT (www.perkinelmer.com). (From Coates, used with permission.)...

In the post-column detection configuration, detection is carried out at a location remote to the outlet of the capillary. For example, in radionuclide detection, the capillary eluent is spotted onto a membrane or collected as fractions, and subsequently exposed to a scintillator for detection Postcolumn detection allows for the separation and detection to be independently optimized. In the case of radionuclide detection, the detector integration time can be maximized without a corresponding loss in resolution (see Section 9.2.2). 

In general, the signal-to-noise ratio (SNR) of a detected peak increases with longer detector integration times. With the exception of post-eolumn detectors, the integration time is limited by the velocity... 

SAINT, SAX Area-Detector Integration Program, 7.34A, Siemens Industrial Automation, Inc., Madison, Wis, USA, 2006. 

The length of the column used in the analysis was 7.1 cm, with a calculated volume of 0.25 ml. The time required to automatically pack the microcolumn was 4.5 min, including washing steps. After elution, online detection was carried out by a flow-through liquid scintillation detector, configured with a 0.5 ml flow cell. The detector integration time to accumulate counts for each data point reported... 

Polymer Laboratories LC Accord w/UV-vis detectors, integrated HPLC/GPC RI, LS evaporation detectors added... 

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