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Instrument Database:

ESA Inc. - Coulochem III

Year of introduction
Status historical ( out of sale )
Company ESA Inc.
Categories Chromatography: LC-Detector: Electrochemical
  • Modular Design- allows the Coulochem III to be used with any HPLC system.
  • Advanced Digital Electronics- State-of–the industry, surface mount electronics and truly optimized components virtually guarantee reliability and performance.
  • Fast, high resolution processor- an all new electronic design uses a high resolution embedded microprocessors to assure the lowest possible electronic noise, leading to the lowest possible detection limits, widest dynamic range, the greatest speed for compatibility with fast chromatography.
  • 3 Modes of Operation- (DC, Pulse & Scan modes)  
            By optimizing the electronic circuitry into discrete modules, the highest                  performance level for each mode is obtained.
    • 1. DC Mode - In DC mode, currents are measured with a constant applied potential to the electrochemical cell. This mode is used for detection of most oxidizable and reducible compounds using the coulometric electrodes. The electrode surface area in the coulometric cell is more than 50 times the area of conventional amperometric electrodes, with greatly reduced diffusion distance to the electrode, providing a more efficient oxidation or reduction. This allows rapid equilibration, low maintenance, and unparalleled day-to-day stability. Independently controlled potentiostats operate two analytical sensor electrodes. Electrode potential, current range and other operating parameters can be set for each electrode. Advanced, low-noise digital electronics provide maximum sensitivity.
    • 2. Pulse Mode - The method of choice for the sensitive determination of compounds such as alcohols, monosaccharides, and oligosaccharides is Pulse mode.  Multiple potentials are applied over adjustable time spans and the resulting currents are measured. The delay prior to the measurement of sample current is adjustable, resulting in enhanced sensitivity.  Analysis of carbohydrates  is a typical application for use of the Pulse Mode with a noble metal working electrode.
    • 3. Scan Mode - By automatically scanning through a range of potentials, a current vs. potential curve is generated. The resulting cyclic voltammogram (CV) quickly determines if a compound is electroactive.  Additionally, the CV can indicate if the analyte is readily oxidizable and/or reducible. This reversibility can be used to effect even greater selectivity when using the Coulochem III
  • Potential Control- In DC mode, 2 function for analysis (5010, 5011 analytical cells) and a third for control of mobile phase cleaning or sample pre-treatment (i.e. 5020 Guard or 5021 Conditioning cell).
  • External device control- fully automated analyses are now possible through control of external devices such as: valves for on-line sample prep, column switching or on-line microdialysis.
  • Active Input- if mobile phase flow is interrupted, a signal can be sent that will disconnect the applied potential from the cell to protect against damage.
  • Stores up to 25 methods- expanded internal storage capacity permits storage of methods incorporating timeline, input and output controls.
  • Single Keyboard Control- When usingEZChrom Elite™ for ESAChromatography Data System provides automated control of all Coulochem III and HPLC system functions.
  • Organizer Module (Optional)- houses fluidic components of the detection system and creates a Faradaic chamber to provide a protected, noise-free environment for flexibility in use with other cell types and future cell design
Specifications
Basic Configuration:
DC Potentiostat for 1 or 2 channel cells and independent Potentiostat for Guard Cell (standard) and/or Pulse/ Scan Mode via optional plug-in module (cell required)

Operating Modes:
DC, Pulse and Scan
(Timeline methods can be used with DC and Pulse/Scan modes)

Potential Range:
±2000 mV in 1 mV steps, Full Scale current

Range:
10 pA - 100 mA in 1-2-5 sequence
1 nA to 10 mA in 1-2-5 sequence (Scan, Pulse Mode)

Filter Time Constants:
0.2 - 10 seconds in 1-2-5 sequence (DC Mode).

Noise:
< .75 fA peak-to-peak with a 10 MΩ, 2 µF test load and 2 second filter (DC Mode)

Output Resolution:
16 bit (30 µV at 1 V signal output)

Signal Output:
±100 mV, ±1 V, ±10 V

Output Resolution:
DC Mode- 0.12 µV at 1 V signal range (24 bit bipolar)
Pulse/Scan Mode- 1.9 µV at 1V signal output (16 bit bipolar)

Output Offset:     ± 50% of the selected current range in 1% steps

Guard Cell Potential:
±2000 mV in 1 mV steps

Event Marker:
Triggered by front panel keypad, timed operation or RS-232C control, 5% (or user selectable, 0-10%) of full scale

Autozero:
Triggered by independent front panel keypad, rear panel contact closures, timed operation, or RS232 control

Function Keys:
Autozero, Event Marker, Cell On/Off, Run/Stop

RS232 Interface Capability    
Full parametric instrument control of DC and Pulse/Scan modes

Method Storage:
Up to 25 methods
(any combination of DC, Pulse/Scan and Timeline)
DC and Pulse Modes

Programmable Changes:
Select from 0 to 9999.99 minutes in 0.01 minute increments

Autozero, Event Mark:
Independently selectable at start of program and with each current range change

Program Start:
Via front panel keypad or rear panel contact closure from external device

Program Control:     Current Range, Autozero, Event Mark, Potential, Filter Constant

Program Repeats:     1 to 9999

Automated CV Curve:     Start and Stop Potential, Potential Increment for automated determination of optimal operating potential
            
Power:
100/120/220/240 VAC, 50/60 Hz, 24 VA

Dimensions:
19.5" (L) x 9" (W) x 11.25" (H), (49.5 cm x 23 cm x 28.6 cm)
     
Operating temperature:     10 to 35C
Humidity:     Up to 80% RH (at 35°C), non-condensing

Weight:
14.8 lbs (6.7 kg) Detector only with DC and Pulse/Scan

Certifications:
UL, CUL and CE





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