FOAM ANALYZER

Foam comes in two variety-foam people those who want foam and those who don’t! After years of working with customers on different problems, Teclis Scientific has developed a range of instruments to quantify foaming.

These instruments generate foam under controlled conditions and measure in real time how much foam forma over time and how fast it disappears once foam generation has stopped. The quantity of liquid trapped in the foam is also measured.

 

FOAMSPIN

FoamSpin is designed to measure the ability of a liquid to generate foam by mechanically stirring the liquid. A set of rotating blades produces foam under control of the instrument software. The blades (driven by rotating shaft) turn at speeds up to 6 000 rpm. Actual speed of the blades is measured and controlled continuously by the software.

Maximum rotation speed of the blades depends on viscosity of the liquid being foamed. FoamSpin software will determine persistence of generated foam by measuring variation in its volume, density and drainage rate. The electronic cabinet allows manual control of the stirrer used to produce foam.

Measurements made by FoamSpin

Values measured and displayed in real time:
. Speed of mixing
. Foam volume,
. Volume of sample liquid remaining,
. Foam conductance at four different foam heights,
. Liquid fraction in the foam at for different foam.

Values calculated in real time and displayed upon completion of the experiment:
. Volume of liquid trapped in the foam,
. Foam density,
. Bikerman index,
. Volume stability of the foam,
. Liquid stability of the foam,
. Coefficient of expansion of the foam,
. Capacity for foaming,
. Parameter of retention (for the RUDIN test).

Features

. All instrument operation are controlled by software which runs under Windows XP or Vista,
. Minimum volume of liquid sample: 150ml,
. Agitation speed : up to 6000 RPM,
. No correction factor,
. Agitation speed :up to 6000 rpm,
. Device friendly and robust construction.

Options

.  Measuring tubes with jacket to allow temperature control (90°C maximum)
.  CSA Option: Bubbles Size Analysis (Cell Size Analysis CSA)
.  KLEE Option: Automatic rinsing between experiments
.  Sampler Option: Sampling automatic and continuous analysis of 15 samples maximum.

 

FOAMSCAN

FoamScan® is designed to measure the ability of a liquid to generate foam by sparging a gas through the liquid. It will also determine persistence of the generated foam by measuring variation in its volume, density, and drainage rate.
Liquid samples for FOAMSCAN® are placed in a sample chamber which can be thermostated (in option). Onto this chamber is fixed a glass column equipped with several pairs of conductivity electrodes. Foam develops in the sample chamber (by sparging or stirring, Foamspin option) and rises into the glass column where it is viewed continuously by a video camera. Images from the video camera are captured by software along with conductivity measurements at all the electrodes. This data is used to calculate and plot foam volume and conductivity in real time.

Measurements made by FoamScan

. Values measured and displayed in real time:
. Gas flow rate or speed of mixing (FOAMSPIN® option)
. Foam volume,
. Volume of sample liquid remaining,
. Foam conductance at four different foam heights,
. Liquid fraction in the foam at for different foam.

Values calculated in real time and displayed upon completion of the experiment:
. Volume of liquid trapped in the foam,
. Foam density,
. Bikerman index,
. Volume stability of the foam,
. Liquid stability of the foam,
. Coefficient of expansion of the foam,
. Capacity for foaming,
. Parameter of retention (for the RUDIN test).

Features

. All instrument operation are controlled by software which runs under Windows XP or Vista
. Minimum volume of liquid sample: 20ml
. Gas flow up to 500 cm3/min
. No correction factor
. Agitation speed (FOAMSPIN® option): up to 6000 rpm
. Device friendly and robust construction.

Options

. Foamspin Option: Foam generation by stirring
. Measuring tubes with jacket to allow temperature control (90°C maximum)
. CSA Option: Bubbles Size Analysis (Cell Size Analysis CSA)
. KLEE Option: Automatic rinsing between experiments
. Sampler Option: Sampling automatic and continuous analysis of 15 samples maximum
. Option HTHP: Measurements under pressure and high temperature (120°C, 8 bar).

Foamscan HP – Measurement at high temperature and high pressure

Foamscan HP makes analysis of foam properties at high temperature and high pressure.
It is designed to measure the ability of a liquid to generate foam by gas sparging through a liquid at pressure max 100 bars and temperature max 250°C.

Software controls automated sampling, foam generation and analysis, so measurements are made without influence.
Foam tube includes the foam probe and the support of the glass frit in a stainless steel cell. It is mounted into the measurement unit of the Foamscan HP.
The temperature control is achieved by resistance heater built into the environmental chamber walls.
Foam volume is measured by foam probe.

Measurement made by Foamscan HP

Data measured and displayed in real time:
. Foam volume
. Gas flow rate
. Volume of sample liquid remaining
. Pressure inside the cell
. Temperature inside the cell.

Data calculated in real time:
. Foaming capacity

Features

. Measurement at temperature up to 250°C and pressure up to 100bars
. Operating measurement in the safe condition
. Automated sampling
. Automated cleaning
. All instrument operations are controlled by software
. Option: adapting Cell Size Analysis (CSA) option.

 

FOAM VIEW

In most of foam applications, bubble size variation is useful to study foam behavior.
In this case, measurements with FoamView provide a characterization method.

FoamView instrument takes pictures of the top of foam to acquire information of bubbles evolution versus time by a high-resolution camera.

FoamView software is developed to analyze foam bubble size and its distribution with colored images.

Features

. Camera resolution can go very high on-demand.
. Processing steps of pictures can be defined by the user and executed automatically.
. Analysis area – rectangle or circle.
. Analysis on colored or black and white pictures.
. Data exportation to Excel sheet: distribution, size, number, density, volume, area.

Minijet

The Minijet is designed to measure the ability of a liquid to generate foam by the circulation of the liquid. It is the miniature version of Jetscan.

A jet of sample is directed downwards into a pool of liquid at the bottom of a glass tube to generate foam. Inlet of the circulation pump is at the base of this glass tube, well below the foam. The pump forces sample liquid from the top of the tube to supply the jet. A video camera views foam in the glass tube, providing data to image analysis software which determines foam volume. Glass tubes is with double walls to allow fluid (from an optional circulating bath) to control temperature of the liquid used to produce the foam and the foam itself.

After the experiments, the sample can be removed automatically by the pump.

Measurement made by Minijet

Raw data include:
. Foam volume
. Liquid volume
. Flow rate of the liquid jet
. Foam temperature

Features

. Measurement at temperature up to 80°C
. Auto-injection sampling system
. Automated cleaning
. Flow rate range of 100-1000 ml/minute
. All instrument operations are controlled by software
. Option: Defoamer option*

* The Defoamer option is available to allow injecting automatically defoamer into the sampler.

 

JETSCAN

This instrument produces foam by recirculating sample liquid method.

In the JETSCAN, a stream (or jet) of sample is directed downwarded onto a pool of liquid at the bottom of a glass tube to generate foam. Inlet of the circulation pump is at the base of this glass tube, well below the foam. The pump forces sample liquid through a heat exchanger and back to the top of the tube to supply the jet. Experiments can be made at temperatures up to 90 °C. A video camera views foam in the glass tube, providing data to image analysis software which determines foam volume. Defoaming agent can be introduced automatically into the jet or into the reservoir holding the sample.

Application

JetScan® can be used in the many fields such as:
. Sugar refining
. Paper making
. Food manufacturing
. Detergency
. Specialty chemicals

Measurements made by JetScan

JetScan measures in real time:
. Volume of foam
. Liquid flow rate required to produce a constant foam volume
. Quantity of liquid trapped in a foam
. Foam “knock down” time

Options

JetScan ® can be fully automated in the introduction of liquid samples, the introduction of anti-foam and cleaning of the entire apparatus.

Results

Results from a typical experiment are shown at right. The graph shows formation of foam by jet. Reproducibility is also demonstrated by degree of overlap in the three measurements.
With all automation features installed, either version of JETSCAN will introduce a sample for measurement, heat the liquid to temperature (up to 90 °C), measure steady state foam volume, inject a defoaming agent, determine how long the defoamer is effective, dispose of the sample, rinse itself, and then introduce the next sample for analysis.

SIAM

Siam® is a TECLIS measuring instrument which can characterize foam volume generated by washing powders and duration of their anti-foams.

It applies any type of front window washing machines. This equipment consists of a device to film (CCD camera) and to enlighten the window of washing machine.

A second device is made of sensors connected to the washing machine. It allows to measure:
. Temperature in the tumbling box
. Current intensity consumed.

Principle

The Principle is to measure foams volume generated by image analysis when the tumbling box stops. The measurement of the current intensity will allow to identify the exact moment when it is running and the cycles of heating and flushing.
By using these data, we can obtain a kinetic study of foam volume. We can also obtain information about influence of temperature on the foam and on life of anti-foams.

Applications

. The analysis can be achieved on an empty or a filled tumbling box,
. One PC can control two Siam instruments and it allows comparison between the different washing powders.