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Flow Measurement and Control

 Industrial-Automation  No Responses »
Jun 012009
 
Flow Measurement and Control

There are three Controls to be Adjusted to make a Proportional Flow Controller Perform Properly. This method has to be practiced and experience gained from it can be used to get very good and stable Control of the Flow or Velocity of a Fluid. 1. Set Point. (SP) This is the Flow Rate at which you require the Fluid to be controlled at. Adjust the rate at which the fluid flow is expected to be controlled . 2. Process Value. (PV) This is the Actual Flow Rate of the fluid in the flow sensor or its path. It is very Read More …

 Posted by at 1:50 PM

Multiplexed Presettable Timer with ICM7217

 Timers-Counters  No Responses »
Jun 012009
 

This was a attempt to make a Sequential Timer with ICM7217 of Intersil, even though it worked well, it was not developed beyond the prototype stage or first iteration. Only when a product is made in some numbers, the documentation and designs become clear, streamlined and seasoned. The PCB and Circuit are not complete. It may give ideas. During this time, as far as i can remember, these were the only large CMOS devices. 8080-85 and Z80 devices consumed lot of power and needed big boards and supplies. ICM7217 4-Digit, Presettable, LED Up/Down Counter Maxim Study this, if you are Read More …

 Posted by at 11:31 AM

Analog Mux for Data Acquisition Systems

 Industrial-Automation  No Responses »
May 092009
 

Here is a 4-20 mA In/Out Analog Mux with Cascade option. This is a simple circuit i designed to make a Automation System within a budget. This takes 4-20mA from many Transmitters and gives out just one 4-20 mA output. The Mux is done with a digital byte or word. This is a slow scanner as process is slow, that way many analog inputs can be multiplexed and sent into one analog input of a D/A. In near real time systems a faster mux could be used or mux totally avoided. This was made in some numbers, so the pcb Read More …

 Posted by at 8:17 AM

100kHz Half Bridge Convertor – SG3525

 Power-Supplies  No Responses »
May 012009
 
100kHz Half Bridge Convertor - SG3525

This is a SMPS Circuit application very close to the Application Note in the book SGS Motion Control Application Manual. This worked well. Read about SG2525 – SG3525 – PWM SMPS Regulator Chip. Some Notes Related to the Project In main circuit do not link different grounds. Main circuit can be used both for 110 AC and 230 AC Ferrites are partial conductors use proper insulation before winding. For main transformer TRX2 use split bobbin for good/safe isolation. Epoxy coated toroids have to be further insulated before winding. Line of isolation between primary and secondary circuits should be explicit. Primary Read More …

 Posted by at 12:31 PM  Tagged with:

RTD Pt-100 Signal Conditioning Module

 Temperature-Controller  No Responses »
May 012009
 

This is the RTD Signal Amplifier part of Temperature Controller or Indicator. The card also contains a relay on-off control circuit. The Circuits are – RTD and V/I Module Propotional Output RTD and Control Module ON-OFF The PCB Boards – RTD Module Copper RTD Module Solder Mask RTD Module Silk Screen RTD Module Drill Template

 Posted by at 7:55 AM  Tagged with:

Two Set Point – Display Card – Process Controller

 Process-Controllers, Temperature-Controller  No Responses »
Apr 012009
 
Two Set Point - Display Card - Process Controller

This is the pcb board details of a Two Set Point Controllers for any process, shown here for temperature. For new types of transducers or input types, module card has to be designed or modified. The other cards remain the same. The cabinet of these process controllers were made of steel for shielding, but the display card would still pickup EMI in some cases. These were more in instances where the Instrument supply was derived from the motor 3-phase supply. Instrumentation Supplies 230V AC must come from a Lighting Circuit of another supply arm, this has to come after conditioning Read More …

 Posted by at 9:12 AM  Tagged with:

Proportional Module for Process Controller

 Temperature-Controller  No Responses »
Apr 012009
 

When you need a proportional control output, either 4-20mA or Time Proportional On-Off, This module is used. It does a slow PWM control, the cycle time for SSR or Thyristor Banks can be closer to Mains Frequency. The 4-20mA can be used to drive motors for turning valves for fuel or fluid heat control. Schematics of Module Proportional Control Card Two Set Point Card Proportional Control Card 4-20 mA Board of Module Proportional Module Copper Proportional Module Solder Mask Proportional Module Silk Screen Proportional Module Drill Template

 Posted by at 7:53 AM  Tagged with:
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