Universal diaphragm actuator for individual control and regulating functions
March 2000Analytical Instrumentation & Environmental Monitoring
Valve & Automation
Even in the electronic age many industrial sectors make effective use of diaphragm actuators with pneumatic or electro-pneumatic positioners as standard actuators.
Short floating speed and high control forces are criterions resulting in high efficiency, reliability and especially long duty lives.
ARCA diaphragm actuators have proven themselves in the industry for more than 50 years. Anywhere where robust design, functional safety and a specially favourable ratio of costs and performance are required.
The function
Air power moves the spindle via the diaphragm against the spring tension. In the case of decreasing air pressure the spring acts in the opposite direction. The initial spring tension can be adapted to the process data by means of the spring tensioning screw. The support is connecting the actuator with the control valve. At the same time the stroke indicator is the connection to the valve spindle.
The proven ARCA modular system enables the user to combine all valve types with the UMA-types.
Important advantages
*niversal – The same type is applicable for both control and regulation functions.
*Reversible – For reversing the control action, all that is needed is to loosen four screws, flip the actuator through 180° and tighten the screws again. Planning errors can still be corrected on the spot without any problems. (Swapping normally open for normally closed).
*Strong forces – The strong springs in a solid casing made of high quality aluminium alloy are providing these actuators with control forces of up to 4 t.
*Long duty life – All parts are designed for approximately one million strokes. A special diaphragm allows a maximum operating pressure of 600 kPa.
*Mounting facilities – Provision is made for the optional inclusion of a support (NAMUR) provided for positioner, limit switches, stroke limitations or field controller. Several instruments can be mounted directly.
*Low-priced hand adjustment – For emergency operation of valves, hand adjustment devices can also be mounted subsequently.
p Few spare parts, little maintenance – The restriction to four sizes only means that only a few spare parts need to be stored for emergency cases.
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