Multi Zone Process Controller

Advertise in delabs

This was one unique custom design, It was Multi Zone Scanner controller. Four temperature sensors were connected to the system with brushes just like in a motor. Even the supply to the trasmitters was on the brushes.

Multi Zone Temperature Controller

The Instrument had a Analog Multiplexer with a Synchronous Sample and hold, as the analog value was coming via the brushes. It had four relays that would turn off or on every scan cycle, depending on the input values. The system was slow it had inertia, so it did not require a fast acquisition for ‘Real time’ as you may find necessary in small Thermal Systems.

This was built with analog and digital chips, no uC in this design. This was because it was a front end controller, there was a risk of a uC system getting stuck. These days, that problem may not be so worrisome, but i am not so sure.

What if the watchdog goes for a short nap?

You can find part of the designs here – Industrial Process Control Circuits

  • Mixed Circuits Analog with Digital
    Mixed Circuits Analog with Digital Here are some circuits that have both Analog and Digital Signals in them. At one time i wanted to make [...]
  • Technical Writing and Support
    Proper documentation of product after design include Engineering Documentation, Production and Purchasing Inputs, Service Manuals, Operator Manual, Quick Reference Cards. Charts and Tech Catalogs. There [...]
  • Pressure Measurement and Control
    Pressure is the next most important parameter after Temperature. In Hydraulics and Pneumatics, the measurement, indication, control and logging-charting of pressure is indispensable. Popular Pressure [...]
  • Multi-Instrument Digital Assistant – PIC16F84A
    Multi-Instrument Digital Assistant – PIC16F84A “It contains four instruments in one unit: logic probe, single channel logic state analyzer, frequency counter and serial code receiver.” [...]
  • Libelium Comunicaciones – Wireless SolutionsLibelium Comunicaciones – Wireless Solutions
    Designs and manufactures hardware for the implementation of wireless sensor networks, mesh networks and communication protocols for all sorts of distributed wireless networks. Libelium Comunicaciones [...]
  • Measure R and C using uC without AD
    This article describes how to measure values of a variable resistor or a variable capacitor using a microcontroller to measure the RC charge time to [...]
  • Connexions – share educational material
    A place to view and share educational material made of small knowledge chunks called modules that can be organized as courses, books, reports, etc. Anyone [...]
  • Temperature Controller for Cooling Chamber
    This is part of an user manual i used to give for cooling controllers – app007.pdf The Logic of cooling in temperature control is inverted, [...]
About delabs 419 Articles
delabs is a web-service for product design and development.