Fast GC with two columns and sampling valve


ideal for individual components
heartcut and backflush operations
fast, modular and simple

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The Calidus CS for heartcut and backflush applications.

Calidus CS Gas Chromatograph

The Calidus CS comprises 5 modules: a sample processing unit with sampling valve; 2 x resistively heated column modules (choice of columns available); and 2 x detectors (either flame ionisation (FID), flame photometrics (FPD) or thermal conductivity (TCD)).  The column switching valve enables the GC to perform heartcut and backflush operations, making it ideal for individual component specification from a sample matrix.  

Having two resistively heated columns means that they can be independently temperature controlled with ramp rates from 0.1 to 5 °C per second from 5 °C above ambient to 180 °C.

It can be used for product specifications testing, product safety, environmental measurements, catalyst protection, research and many more applications:

  • in the laboratory
  • at line
  • is transportable
  • on-line

A single Calidus™ GC provides a simple ultra-fast analysis 10 to 50 times faster than conventional GCs, has a footprint less than half of a research grade GC, and the capacity to do the work of 4 to 5 research grade GCs, making it the leading choice for gas analysis equipment and a cost effective measurement method.

The modular design lowers maintenance costs and increases flexibility to run different fluid mixtures.

The Calidus series of GCs uses ground breaking technology in the form of resistively heated column to give superior performance. Using the stainless tube as the heater means that the traditional ovens for columns can be removed and the size of the system can be dramatically reduced.

The ethos of the Calidus series from day one was that a GC used in the lab should be the same GC when used as an on-line system for process control.  This way the performance, methods and procedures developed for highly repeatable measurements can be directly applied to on-line systems.

Chromatogram for Diesel



Gas chromatograph analysis

Measurement principle

Flame ionisation, flame photometrics or thermal conductivity


Transportable, on-line, at-line or laboratory

Dynamic range

Depends on detector used and application (FID typically 105)


± 1 % RSD or better (area) and ± 0.1 % RSD or better (retention times)


50 to 100 Hz digitization (detector dependent) on each column, 24 bit resolution, auto zero on each run

Analysis time

For VOCS: can be < 20 secs

For SVOCs: can be < 60 secs

Capillary column

Two 2 m long, 100 to 320 μm ID

Optional: column modules available in Mxt-1, Mxt-5, Mxt-1701, Mxt-Wax, Mxt-Molesieve, Mxt-Alumina, < 320 μm and various film thicknesses

Temperature control

Temperature programmable from 0.1 to 5 °C per second from 5 °C above ambient to 350 °C (maximum temperature software limited to be no greater than the limit for the columns installed, isothermal operation is available)

Sample inlet

Gas and liquid inlet for syringe injection of samples, or automated gas and liquid sample valves available

Pressure of sample gas

0 to 50 PSIG at ambient temperature

Liquid injections

Neat or dilute organic solvents (DCM, hexane, MEK, toluene, methanols, CS2, etc.)

Other sample requirements

Membrane, SPME and static and dynamic headspace extracts


All functions and parameters via ethernet or RS-232 using ChromPerfect™ software.

Start analysis from keyboard or GC. Set method from external computer using ChromPerfect™.

Trigger in and ready out signals plus an array of others via ChromPerfect™

Front panel displays

Temperature and pressure readings, function on/off, other

Power on/off

Status of analysis columns (isothermal, programming, cool down, ready, cycles run, other)

Operating temperature

0 to +35 °C

Storage temperature

-20 to +60 °C

Relative humidity

0 to 100 % (non-condensing)



CE mark pending


Shipping weight

~ 9 Kg



279.4 H x 432 W x 216 D mm


Power requirements

< 300 Watts peak power at startup, practical use < 200 Watts for gas or liquid analyses

24 VDC supplied from external power supply, 100 to 240 VAC using 50/60 Hz AC

Gas supplies

50 PSIG, 99.995 % H2 or He at up to 250 ml/min, 50 PSIG zero air for FID operation

Data processing

Via external computer with Windows XP or newer operating environment, using ChromPerfect™ software



Full reporting and data export capability via ChromPerfect™


Up to 16 analogue outputs


All specifications subject to change

Palarus GC Autosampler

Palarus GC Autosampler

The Paralus GC Autosampler is one of the third generation of x,y,z robot-like autosamplers.It communicates seamlessly with the Calidus operating system to provide faster, quieter and more reliable movement. The durable construction has no bungee cords and provides fast injections with up to a 324 vial capacity.

View the Palarus GC Autosampler here


Hydrogen Generator

Precision Hydrogen

These modular, stackable generators allow a safe hydrogen supply for carrier gas and FID operation without the requirement for storing high pressure hydrogen cylinders. These generators complete the portability of the Calidus GC and provide high purity hydrogen by electrolysis of water. The only utilities required are power and demineralised water to produce an uninterrupted supply of hydrogen gas.

Download the data sheet here

View the Precision Hydrogen here


Part 1 - Introduction and setup of the Calidus

Part 2 - Explanation of the Calidus

Part 3 - Inside the Calidus

Part 4 - Injector and plumbing of the Calidus

Part 5 - Computer power of the Calidus

Part 6 - Getting ready to run the Calidus

Part 7 - Setting up software for the Calidus

Part 8 - Initialising run conditions for the Calidus

Part 9 - Running samples on the Calidus

Graphing & exporting chromatography data, from Chromperfect

Comparing chromatograms, from Chromperfect

Integration of chromatography data - negative peaks, Chromperfect



Calidus quick installation guide



Applications range overview

ASTM 2887 fast distillation simulation

Extended natural gas with fast GC

Extended natural gas GC

Fast and micro GCs: recent developments

Lonza improved process control

Not just for simulated distillation

Update on new fast GC ASTM2887



C. Rechsteiner: Economic impact of fast and micro GCs

Chevron: Refinery support using fast and micro GCs

Chevron: Use of fast GC from exploration to refinery floor

ChromPerfect: Simplifying data systems

ChromPerfect: SL software

Clearstone: Fast transportable GC presentation1

Clearstone: Fast transportable GC presentation2

Falcon Analytical: Ultra fast GC Pittcon 2015

Infometrix: Advanced data processing for fast GC

Infometrix: Instrument maintenance in fast GC

J. Crandall: Micro and fast GC

Lonza: Improved batch process with fast automated GC

Parker: Process control with fast micro process GC

Parker: Smart and fast GC with NeSSI

SGS: Fast and micro GC with advanced automation for upstream applications

SGS: Recent advances of fast GC

T Bell: Ultra-fast fuel characterisations C5 to C44 with astmd



Gas chromatograph Calidus CS datasheet