I just got a letter from a US firm enquiringly about my transmitters. It read something like …
“…..Mini RTD Pt100 Three Wire Transmitter is commercially available? We may be interested in both the 100 ohm RTD input as well as the 1K ohm RTD input types”
I do not respond to product enquiries as i do [...]
Archive of posts filed under the Process Control category.
Sensors and Transmitters Real World Interface
Industrial Control Panels and Instruments
Temperature and Pressure Controllers form a large part of Process control Instrumentation. Then you have Flow, Humidity and many more custom parameters. All Real Life Physical Phenomena are reduced to Analog Numbers by Sensors and Transducers. This analog value is amplified and linearized and brought into standardized windows like 1-5 Volts or 4-20mA and more. [...]
Proportional Module for Process Controller
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 [...]
Thermocouple and Current Input Module
This module converts J, K Thermocouple and 4-20 mA Inputs to 0-2V Full Scale. These can be used for any voltage input too. The RTD module can be modified more easily for Voltage inputs. The control output can be On-Off or 4-20 mA/Proportional with another card. The 4-20mA I/O STC1000I is not complete.
Schematics of Modules
J [...]
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 [...]
Temperature Controller Main Card
This contains the Main card with a Power Supply and Relay Control. On this card is connected the Display ICL7107 – Temperature controller.
The Thermocouple and Control Modules can be plugged into this card, these change the type of control and type of inputs. This way this can be made into any parameter controller with any [...]
RTD Pt-100 Signal Conditioning Module
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
