Analytical Instrumentation & Environmental Monitoring


New intelligent electropneumatic valve

March 2000 Analytical Instrumentation & Environmental Monitoring

Fairchild Industrial Products recently introduced the high flow, high pressure, intelligent electropneumatic valve model T7900. The unit comes in a number of pressure control ranges between 10 and 1000 kPa with flow capacities close to our model 4500 volume booster, up to 200 normal m3/h and various other features.

A built-in pressure sensor, for example, measures output pressure directly at the output port. A remote feedback option is available as well making pressure measurement possible at a remote location. This pressure signal is subsequently available as 4 to 20 mA signal to the control system.

Output pressure control is done by the built-in PID controller receiving a 4-20 mA signal as setpoint from the control system.

The built-in PID controller can be tuned to the needs of the customer, making the change from the 4 to 20 mA input signal to the required pressure output signal as smooth as possible. The electronic valve is therefore equipped with a four button keypad to make tuning and calibration possible directly from the unit.

Especially in the paper industry the 4-20 mA output pressure signal, in combination with for example the remote pneumatic feedback option, makes it possible to keep track of any pressure losses in systems downstream from the electronic valve. This could be pressure losses for example, in bellows used as in shoe presses or on-line coating systems. This way the customer notices immediately when there are any leaks in these systems.

The T7900's four button keypad and liquid crystal display allow easy on-site entry of operating parameters and the precise setting of tuning coefficients for a wide range of applications including machine tool automation and robotics. The display shows output pressure in either psig, bar or kPa.

In addition to the internal feedback sensor, a remote current or voltage feedback signal is also standard. Instead of the remote feedback sensor, adjustable dry contact high and low limit alarm relays are available as an option. A remote pneumatic feedback signal is also optional.

Nema 4X, IP65 and Type 4 enclosure allows use in outdoor or washdown applications and its RFI/EMI protection eliminates susceptibility to electromagnetic and radio interference.



Credit(s)



Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Two-gas detection monitor
July 2021, Comtest , Analytical Instrumentation & Environmental Monitoring
New lightweight two-gas monitor offers more accurate alarms and minimises maintenance with a two-year runtime.

Read more...
MAP – making the right choice for gas analysis
August 2021, Elemental Analytics , Analytical Instrumentation & Environmental Monitoring
Modified atmosphere packaging (MAP) is used within the food and pharmaceutical sectors to extend the shelf life of many products that would otherwise deteriorate quickly in the presence of oxygen.

Read more...
Accurate particle matter measurement
June 2021, GHM Messtechnik SA , Analytical Instrumentation & Environmental Monitoring
The PMsense datalogger has particular applications in smart city applications and the monitoring of particle matter pollutants found at industrial sites.

Read more...
24/7 boiler monitoring with the SWAS Compact
June 2021, Endress+Hauser South Africa , Analytical Instrumentation & Environmental Monitoring
Endress+Hauser has developed a compact new steam analysis device for continuous boiler water monitoring.

Read more...
Flexibility for disinfection measuring points
April 2021, Endress+Hauser South Africa , Analytical Instrumentation & Environmental Monitoring
Endress+Hauser’s new modular Flowfit CYA27 flow assembly enables measurement of up to six parameters in process and drinking water.

Read more...
Alkylation processes in petroleum refineries
April 2021, Morton Controls , Analytical Instrumentation & Environmental Monitoring
The SensoTech LiquiSonic is an inline analytical system for determining the concentration of binary liquids directly in the production process.

Read more...
A safe and easy way to check water quality
March 2021, Endress+Hauser South Africa , Analytical Instrumentation & Environmental Monitoring
Ready-to-use water analysis panels from Endress+Hauser ensure water monitoring with minimum effort and maximum reliability.

Read more...
ABB urges adoption of high-efficiency motors to combat climate change
April 2021, ABB South Africa , Analytical Instrumentation & Environmental Monitoring, Electrical Power & Protection
Global electricity consumption could be reduced by 10%.

Read more...
Loop-powered watercut meter
May 2021, SECO Process Instrumentation , Analytical Instrumentation & Environmental Monitoring
The Easz-1 oil/water monitor is a highly accurate online analyser that is installed in a pipe and can be used as a BS&W (basic sediment and water) monitor, or a watercut meter.

Read more...
Optimising DeNOx plants with the in-situ gas analyser
February 2021, SICK Automation Southern Africa , Analytical Instrumentation & Environmental Monitoring
SICK Automation’s innovative new GM32 in-situ gas analyser helps reduce emissions in DeNOx plants.

Read more...