LC epsilon Electrochemical Detector

The LC epsilon (e5) is the latest in the line of electrochemical detectors that BASi initiated over 30 years ago. It is a fully computer-controlled detector specifically designed for the requirements of electrochemical detection in liquid chromatography. It controls and monitors a thin-layer flow cell attached to chromatographic columns ranging from microbore to standard bore (0.32 - 4.6 mm ID) formats. It is optimized for high current sensitivity and low noise by including important design features such as extensive filtering, optical isolation between the digital and analog components, and particular circuit layout and electronic component selection. Users have great flexibility in choosing a configuration to meet their needs with 1-, 2-, and 4-channel versions available. It can perform constant potential amperometric detection, pulsed amperometric detection (PAD), and can acquire data from external devices. Included is ChromGraph® software, a sophisticated set of programs for control of the LC epsilon and the acquisition and analysis of data generated by the liquid chromatography system. The software runs in the Windows® environment, providing all the flexibility and multi-tasking inherent in this operating system.

Features

• 1-, 2-, or 4-channel electrochemical detection (EC) available
• Pulsed amperometric detection (PAD)
• ChromGraph® control, data acquisition, and analysis software
• Provision for inputs from two external LC detectors
• Optically isolated circuitry for noise reduction
• Both analog and digital filtering for maximum noise reduction
• 100 pA to 5 mA gain ranges
• 20-bit data resolution
• 1- and 2-channel instruments can be easily upgraded to 2 or 4- channels

Data Channel Configurations

• One Channel: 1 EC or 1 PAD or 1 external
• Two Channel: 2 EC or 1 EC & 1 external or 2 externals or 1 PAD
• Four Channel: 4 EC or 3 EC & 1 external or 2 EC & 2 externals or 1 PAD
  

Specifications

Data Acquisition for All Channels

• Resolution: 20 bit data
• Data acquisition speed: 75, 150, 300, 600, 1200 points per minute
  

Potentiostat

• Applied Potential: 0 ±2.55 V for EC Channels
• Potential resolution: 10 mV
• Compliance Voltage: ±12 V
  

Current-to-Voltage Converter

• Current Ranges Channels W1 and W2:
  24 ranges: 0.1, 0.2, 0.5, 1.0, 2.0, 5.0, 10, 20, 50, 100, 200, 500 nA/V and 1, 2, 5, 10, 20, 50, 100, 200, 500 µA/V and 1, 2, 5 mA/V
• Current Ranges Channels W3 and W4:
  13 ranges: 0.1, 0.2, 0.5, 1.0, 2.0, 5.0, 10, 20, 50, 100, 200, 500 nA/V and 1 µA/V
• Maximum Current: Channels W1 and W2: 5 mA
• Maximum Current: Channels W3 and W4: 1 µA
• Filtering applied to EC Channels and External Channels
• Digital Filter, 12 settings: 0.04, 0.05, 0.06, 0.08, 0.1, 0.15, 0.2, 0.3, 0.4, 0.5, 0.8, 1.0 Hz, none
• Analog filter: 0.1, 1, 10, 100, 1000, and 10,000 Hz
• Offset, Detector Channels W1 and W2: 0 to +/-1mA
• Offset, Detector Channels W3 and W4: 0 to +/-1uA
• AutoZero (All the EC Channels): 0-100% full scale
  

Input/Output of the Back Panel

• External Input Channels: 3 ranges: +/-10V, +/-1V, +/-100mV
• Autosampler
• Current Analog Output for W1, W2, W3 & W4 : +/-1V
• Potential Analog Output -Eout for W1
• External Input Connector: Ext-1 and Ext-2 (Ext-2 requires W2 Analog board)
• Control Connector: Start in, Stop in, Start out, Stop out
• Event Connectors: 4 SPDT relays with NO, NC, and COM Terminals
• USB Connector to the PC
• W1 Cell Connector: Standard LEMO Connector for W1 cell – as used with other BASi products
• W2-4 Cell Connector: LEMO connector (size 2)
  

Power

• 120 or 240 VAC, 50/60 Hz, maximum 240 W
  

Dimensions and Weight

• 16.75" (43 cm) X 5.25" (13 cm) X 12.75" (32.5 cm)
• 1 channel - 20.2 lb. (9.2 kg)

Minimum PC Requirements

• Windows 2000, XP, or Vista
• Pentium III or higher
• 512 MB RAM
• 20 MB hard drive space available
• CD-ROM drive
• USB port

If you purchase the epsilon with a BASi computer, ChromGraph will come pre-loaded and ready to run.

BASi ChromGraph Software

ChromGraph comes as two sister programs, ChromGraph Control and ChromGraph Report. Control sets the instrument parameters and oversees the collection and storage of data. Report processes the data after it has been collected. The two programs can run independently or can be configured so Control automatically passes the data to Report for immediate processing.

ChromGraph software has undergone extensive performance verification using NIST-traceable signals. No version is released until it passes our stringent criteria for precision, accuracy, and linearity.

ChromGraph Control Features

• Four channels of data collection
• Control of BASi epsilon amperometric detector
• Pulsed Amperometric Detection
• Input voltages of 0.10, 1.0, and 10 volts

ChromGraph Report Features

• Choice of auto- or fixed-scale graphics
• Unlimited queuing for automatic operation
• Easy export to spreadsheets
• Automatic optimization of peak-detection parameters
• Math operations allow baselines to be offset, added, or subtracted
• Automatic updating of up to 10-level standards file
• Automatic importing of sample-identifying information

Ordering Information

Once you have selected your method of payment you will need to configure the epsilon Detector for your particular application. Using the price list select one, two, or four channels. You will then need to select the appropriate flow cell to match your initial channel selection. You may also add various options such as an injection valve, column temperature control, and columns. ChromGraph data reduction and control software is included with the LC epsilon Detector.

Upgrades

The LC epsilon is available as a 1-channel, 2-channel, or 4-channel electrochemical detector. A lower channel version can be initially purchased and be easily upgraded to a higher channel version. The upgrades are described below. Please note that the W2-W4 cell lead must be purchased separately.