Operator Interfaces, Switches & Relays


TAG level switch

April 2014 Operator Interfaces, Switches & Relays

TAG level switches are designed to detect the presence of materials that accrue in the surroundings of the electrode’s position. Materials can be fluids, powders, granules and conductive or non-conductive, grains, powders, plastics, oils or water. The electrode may be installed in free air or closed vessels, including metallic or non-metallic pipes or reservoirs.

Some of the principals on which the TAG units function are changes of RF current and voltage, loss of energy and changes of dielectric constant versus air.

RF is transferred from the feeler through the mass of the material to the ground point of the sensing unit. This causes RF energy losses. The variations of RF current are converted to a DC signal that is sent to the control box to activate the dry contact relay. The set will continue to function even when the feeler is completely covered by material.

The function of the sensing unit is not hampered by material sticking to it or influenced by the relative humidity of the environment. After initial fitment of TAG, no further adjustment is required of these fit-and-forget devices.


Credit(s)



Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Mimic’s SH300 text display for PLCs
June 2019, Mimic Components , Operator Interfaces, Switches & Relays
Mimic Components’ SH-300 with text display is a long standing and reliable electronic device for programmable PLCs and other intelligent controllers equipped with a communication interface. It also functions ...

Read more...
A switch for the next ­generation network
Africa Automation Fair 2019 Preview, IAC - Industrial Automation & Control , Operator Interfaces, Switches & Relays
The Hirschmann BOBCAT Switch is a compact managed switch. It is the first appliance to provide advanced security and real-time communication through time sensitive networking (TSN) technology on all of ...

Read more...
Industrial signal conditioner
Africa Automation Fair 2019 Preview, ESTEQ Test & Measurement , Operator Interfaces, Switches & Relays
Setting new standards in industrial process control, ESTEQ’s ClipX signal conditioner adapts to each measurement task, whether it is used with single- or multiple-channel applications, in manufacturing ...

Read more...
Specialised control components
May 2019, Mimic Components , Operator Interfaces, Switches & Relays
Mimic Components supplies specialised control components. As a leader in LED pilot lights and filament lamp replacements, the company is now able to accommodate clients with specific requirements in the ...

Read more...
Specialised control components
Africa Automation Fair 2019 Preview, Mimic Components , Operator Interfaces, Switches & Relays
Mimic Components supplies specialised control components. As a leader in LED pilot lights and filament lamp replacements, the company is now able to accommodate clients with specific requirements in the ...

Read more...
Alarm visualisation by Omniflex
April 2019, Omniflex Remote Monitoring Specialists , Operator Interfaces, Switches & Relays
Plant diagnostics is a key element to ongoing plant reliability and productivity. Identifying some plant abnormalities is akin to spotting an individual animal in a herd of moving animals. It is dynamic ...

Read more...
Advanced programmable time switch technology
April 2019, Legrand , Operator Interfaces, Switches & Relays
Legrand’s AlphaRex3 and MicroRex time switches are designed for easy programming and ensure high clock precision in industrial, commercial and domestic environments. Based on advanced time switch technology, ...

Read more...
Graphic terminals provide enhanced software integration
February 2019, Rockwell Automation , Operator Interfaces, Switches & Relays
End users and OEMs are seeking HMI solutions that simplify and streamline visualisation, especially in larger applications. With the new Allen-Bradley PanelView 5510 family of graphic terminals, companies ...

Read more...
Omniflex’s voice alarms
January 2019, Omniflex Remote Monitoring Specialists , Operator Interfaces, Switches & Relays
Alarm overload is an issue most control rooms must deal with on an ongoing basis and relieving the situation is a priority for most process engineering professionals. Much of the burden has been caused ...

Read more...
Telco sensors in conveyor belt monitoring
January 2019, Gail Norton Instrumentation , Sensors & Transducers
Ordinary belt monitoring units can detect belt failure, but many require frequent maintenance for reliable operation. This is why Telco designed a system that ensures peace of mind for the plant owner. The ...

Read more...