November 2000Analytical Instrumentation & Environmental Monitoring
One of the main causes of atmospheric pollution is uncontrolled emission of dust. Classified industries are required to fit an approved dust emission measurement system such as that offered by Oldham.
The Oldham Observer EP 1000 is based on the principle of laser beam retrodiffusion by dust particles. Pointed towards the dust-bearing atmosphere, the laser beam is reflected by the suspended particles back towards the source, providing an indication of dust concentration. The amount of reflected light is used to determine dust concentration in the atmosphere. Measurement is instantaneous and permanently recorded.
Figure 1. The Oldham Observer EP 1000 dust monitor
The EP 1000 uses light reflection (instead of absorption as in other equipment) and has the ability to measure very low concentrations with no zero drift. It is relatively insensitive to water droplets, flowrate and particle temperature. The unit features excellent signal linearity, especially at very low concentrations.
The laser transmitter is modulated, only the portion of the detected light that exhibits modulation identical to transmitting laser's modulation is measured as reflected light. This makes the dust monitor essentially immune to interference from any spurious light sources. The detector is relatively insensitive to water droplets and it has a built-in protection from dust penetration. This is implemented by means of a positive air pressure (from an air blower) and an optional shutter. These features, together with its insensitivity to temperature variations make it a reliable instrument.
The detector is housed in an easy to install polyurethane box, only one side of which has to be mounted into the stack. The unreflected portion of the transmitted laser beam enters a light trap, which is mounted on the stack, opposing the sensor/transmitter installation. The sensor requires no special alignment.
Figure 2. Accessories: air blower, chart recorder, remote keyboard and light traps
Several selectable ranges of operation are available, the device, which has a linear response characteristic, may be run continuously or be used for instantaneous measurements. Outputs available are 2 to 20 mA, RS485, RS422 and Modbus. The Oldham Observer EP1000 has a setpoint overshoot alarm and is specified to operate between -25 and +55°C.
Meteorological data logger with up to 32 analogue sensors Senseca
Analytical Instrumentation & Environmental Monitoring
Senseca has introduced its advanced data acquisition system for environmental monitoring, which has a universal data logger for up to 32 analogue, pulse and smart digital sensors.
Read more...Cooling tower bleed control
Analytical Instrumentation & Environmental Monitoring
Cooling towers rely on evaporation to remove heat, but this process also concentrates dissolved solids in the system. Left unmanaged, this buildup can lead to scaling, corrosion and fouling, reducing efficiency and increasing maintenance costs.
Read more...Importance of gas analysis in the petrochemical industry Elemental Analytics
Analytical Instrumentation & Environmental Monitoring
Gas analysis plays a critical role in petrochemical operations, supporting process optimisation, product quality and plant safety. As an experienced and expert gas analysis supplier, Elemental Analytics can provide the correct analyser and sample system package to meet individual plant requirements.
Read more...Filters for zero-alcohol wine Parker Hannifin - Sales Company South Africa
Analytical Instrumentation & Environmental Monitoring
The market for zero-alcohol wine is creating fresh opportunities for wine producers, but processing these products creates new contamination challenges. Technical support from an established filtration specialist, such as Parker, can help wineries in overcoming the challenges posed by the increased risk of contamination.
Read more...Remote monitoring solution for sewage plants ifm - South Africa
Analytical Instrumentation & Environmental Monitoring
With ifm’s remote monitoring solution, you can visualise the condition of the submersible pumps in your sewage plant and diagnose issues before they become serious problems.
Read more...Precision in every drop, powered by ICP technology Wearcheck
Analytical Instrumentation & Environmental Monitoring
Elemental profiling using Inductively Coupled Plasma – Optical Emission spectroscopy provides useful information on the chemical composition of lubricants.
Read more...A trusted oxygen analyser back in action Elemental Analytics
Analytical Instrumentation & Environmental Monitoring
After a period of discontinuation, Servomex’s Oxy 1810 oxygen analyser has officially returned.
Read more...Multi-channel pH and conductivity controller for the water sector Senseca
Analytical Instrumentation & Environmental Monitoring
The measurement of pH and conductivity plays an integral role in water systems. Senseca South Africa has introduced a multi-channel controller that allows the connection of up to five digital sensors and a frequency-emitting flow sensor.
Read more...DEKRA Industrial sets new standards for asset integrity in local petrochemical sector
Analytical Instrumentation & Environmental Monitoring
DEKRA Industrial South Africa has strengthened its position as a leader in hydrogen-induced cracking inspections through a strategic combination of advanced non-destructive testing techniques, investment in state-of-the-art inspection equipment and global technical collaboration.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version