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Superb Performance Ion Chromatography
The completely new Ion Chromatography system
from Cecil Instruments – IonQuest – is a top performance
modular system. |
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| The conductivity cell is enclosed
with a heat exchanger in a precisely thermostatted enclosure. The
temperature of the enclosure is controlled to better than ±0.01ºC.
The working temperature may be set by the operator to be between
25ºC and 50ºC and set with a default value of 35ºC
during production testing.
Modular Flexibility
The system is easy to use by control panel
operation, or by using the sophisticated Cecil PowerStream software
for data acquisition, processing and reporting. Full system control
is also provided by the workstation equipped with PowerStream. The
modularity of the system enables its configuration to be changed
with ease, for instance to use a UV/Visible detector. Modules may
readily be replaced, to reduce down-time, should the need arise. |
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Precision Temperature Control
The eluent background conductivity changes
by about 2% for a 1ºC change in temperature. The cell temperature
controlled enclosure temperature may be set by the operator to avoid
ambient changes causing drift. The default value is set at 35ºC
and controlled to better than ±0.01ºC. Temperature compensation
is not therefore required.
Pulse Free Pump
Mobile phase pumping is provided by a dual
piston, digitally controlled, pump . Electronic feedback control
virtually eliminates pulsing without using mechanical damping. |
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Column Oven
The very precisely temperature controlled
oven accommodates Anion and Cation columns and precolumns, as well
as a background suppressor cartridge with its over pressure protection
valve. Close coupling to the detector provides high stability, low
noise and low dispersion.
Leak Detector
A specially designed leak detection system
is accommodated within the cell oven enclosure. The detection system
may be used to shutdown the system if a leak is detected in the
enclosure.
PowerStream Software
This software, developed by Cecil Instruments,
provides system control and superb data processing, manipulation
and reporting with truly unrivalled ease. |
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Detector – Advanced Design
The CE4710 Conductivity Detector is an entirely
new design from Cecil Instruments providing performance of the very
highest order due to its exceptionally low noise and unrivalled
baseline stability. To achieve this standard of performance a very
low volume, 0.5µL, conductivity cell has been designed and
is operated in a precisely thermostatted aluminium oven enclosure.
A specially designed, low dispersion, heat exchanger, is also mounted
in the cell enclosure preceding the detector cell. The exchanger
stabilises the temperature of the mobile phase entering the cell.
With the enclosed system controlled to better than ±0.01ºC
superb performance is always available. Autozero and auto-range
facilities are provided to ensure convenience of operation. Built-in
diagnostics aids instrument evaluation and fault finding. The temperature
controlled cell and heat exchanger enclosure is conveniently accessed
from the side of the detector module, as shown in the photograph.
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Detector Features
- Full control by PowerStream software workstation
- Keypad and LCD interface, for local operation, when required
- Large memory for analytical methods
- Autozero for operator convenience
- Operator selectable cell temperature; default 35ºC
- Leak detection system shutdown. Important for unattended operation.
- Self diagnostics to confirm instrument function
- Mounting facility for Rheodyne injection valve
- Calculation of detector cell constant not required
- Polarity switching
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Chemically Suppressed
Solvent Background
Sensitivity for the measurement of anions
is greatly improved by reducing the conductivity of the eluent
post column. An optional Anion Membrane Suppressor - SAMS
™ - is available which is mounted in the column oven,
in series with and after the analytical column. The suppressor
may be used continuously and is regenerated by a Continuous
Anion Regeneration System - CARS ™ - , which pumps the
regeneration fluid through the post column suppressor cartridge.
The suppressed solvent background conductivity leads to reduced
drift and noise and therefore higher sensitivity for measurements
is available.
Close Coupling to Oven
Close coupling of the detector to the
oven is important in eliminating the effects of ambient
temperature fluctuation on results. The couplers can be seen
on the side of the detector. The cell compartment thermostatted
enclosure is shown in the lower photograph, with the side
cover removed for easy access.
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Pump-Proven Performance
The Cecil CE4100 dual piston solvent delivery
pump is well established as very reliable, convenient to use, with
a very high performance specification. The microprocessor controlled
pump uses a precise stepping motor drive for the dual overlapping
pistons which deliver solvent with very little pulsing. |
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Electronic feedback
is used to control the pump speed during its cycle to reduce
pulsing to a negligible level. No further mechanical pulse damping
is required. Delivery of mobile phase in the range 0.2 –
2.5mL per minute, the usually used range, is well within the
ability of the pump, which delivers in the range 0.001mL/min
to 10mL/min. The wetted components of the pump are, sapphire,
ruby and ceramic inserts.
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The Total I C Concept |
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- Dual overlapping piston pump
- Microprocessor control for low pulsing
- Chemically inert flow-path
- Precisely thermostatted cell
- Low dispersion heat exchanger
- Dual column oven
- Leak detection
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- PowerStream data processing
- PowerStream system control
- In line vacuum degassing
- Regenerative chemical suppression
- IC using UV detector
- Suppressor cartridge in oven
- Modular flexibility
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Convenient Column Oven
It is important that the separation columns
should operate at a constant temperature, matching the temperature
of the measuring cell. The CE4601C column oven module is a very
convenient front opening design accommodating two analytical columns
and precolumns and also, when needed, a mobile phase background
conductivity suppressor cartridge and its over-pressure protection
valve.
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The oven operates over
the range from ambient temperature +5ºC to 85ºC.
The default temperature is set at 35ºC.
The actual and set temperatures are displayed
by a bright LCD display and may be controlled by the adjacent
keypad, or set by the PowerStream software. Temperature stability
is better than ±0.01ºC.
The flow tubes from the columns and suppressor
cartridge enter and leave the oven enclosure through convenient
self-sealing ports. The output port to the cell thermostatted
enclosure lines up with the input connector of the enclosure,
when the modular system is arranged as shown in the photographs
of the system.
The very close coupling to the detector
cell leaves only about 2 centimetres of tube between the oven
and the cell. With the cell and oven operated at the same
temperature, say 35ºC, drift or noise due to ambient
fluctuations is eliminated.
A column switching valve may be fitted
to the oven offering convenient operation.
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